DE2104405C

DE2104405C - Device for braking a mechanical stepper drive

Info

Publication number: DE2104405C
Application number: DE19712104405
Authority: DE
Inventors: Walter 7758 Meersburg F16h47 02 Holzer
Original assignee: Omx AG, Zug (Schweiz)
Priority date: 1970-06-17
Filing date: 1971-01-30
Publication date: 1973-06-20

Description

104104

fenahme einer Zugfeder 16 derart beweglich gelagert, daß das Schwungrads in Richtung eines Pfeiles 11 ausweichen kann. Die Zugfeder i€ bewirkt außerdem, daß die beiden Verzahnungen 8 und 9 sehr zuverlässig gegeneinander gepreßt werden.a tension spring 16 is movably supported in such a way that the flywheel can move in the direction of an arrow 11. The tension spring i € also has the effect that the two toothings 8 and 9 are very reliably pressed against one another.

Das Schwungrads verlangsamt die Transportbewegimg der Transportklinke 1 einmal dadurch, daß das Schwungrad 3 beim Anlaufen in Richtung des Pfeiles 10 eine gewisse Massenträgheit aufweist und zum anderen dadurch, daß die Lagerverluste des Schwungrades 3 überwunden werden müssen. Das Schwungrad 3 kann zusätzlich mit Lüfterflügeln verschen werden, damit auch der Luftwiderstand mit ausgenutzt werden kann.The flywheel slows the transport movement of the transport pawl 1 once in that the flywheel 3 when starting in the direction of the Arrow 10 has a certain inertia and, on the other hand, in that the bearing losses of the Flywheel 3 must be overcome. The flywheel 3 can also give away with fan blades so that the air resistance can also be used.

Die Transportklinke 1 wird gleichzeitig durch die Druckfeder 15 in die Verzahnung 17 der Schaltscheibe 4 gedrückt.The transport pawl 1 is at the same time by the compression spring 15 in the toothing 17 of the switching disk 4 pressed.

Sollte die Bremsfunktion des Schwungrades 3 nicht vollkommen ausreichen, so würde dies dazu führen, daß die auf der Schaltscheibe 4 befindlichen Nocken- ao bahnen bzw. Schlitze S die Abtasthebel der Schalter dennoch nicht ganz exakt betätigen. Zu diesem Zweck besteht Formschluß zw --hen der Verzahnung 17 der Schaltscheibe 4 und der Transportklinke 1. Sollte sich also die Schaltsche.be 4 bei Beendigung dS Transportschrittes noch etwas weiter bewegen wollen so wird dies durch Formschluß zwischen Klinke und Schaltscheibe zuverlässig verhindert. Zusätzlich zu dieser Maßnahm, kann auch die Sperr-Se 18 einen Formschluß nut der Verzahnung 17 bilden. Hierdurch wird insbesondere das Rastgefuhl bei Handverstellung der Schaltscheibe4 verbessert. Trotz Formschlusses zwischen Transportklinke 1 bzw Sperrklinke 18 und TransporWerzahnung 17 der Schaltscheibe 4 andererseits wird nicht verhindert daß die Schaltscheibe 4 in Richtung des Pfeiles 12 von Hand verdrehbar ist. Zu diesem Zweck smü ferner zwei Anschläge 19 und 20, durch welche die Transporiklinke ί unter anderem gefuhrt wird so weit voneinander entfernt, daß die Transportern k, 1 die gewünschte Bewegung beim Ausrasten aus der Transport verzahnung 17 bei Handverstellung der Schaltscheibe 4 ausführen ^n.If the braking function of the flywheel 3 is not completely sufficient, this would lead to that the cam located on the switching disk 4 orbits ao or slots S the scanning lever of the switch but do not operate it exactly. For this purpose, there is a form fit between the teeth 17 of the switching disk 4 and the transport pawl 1. So the Schaltsche.be 4 should be at the end Move the transport step a little further want this is reliably prevented by a positive fit between the pawl and the switching disk. Additionally to this measure, the lock se 18 form a form fit groove of the toothing 17. This creates a feeling of rest in particular improved with manual adjustment of the switching disk4. Despite the form fit between the transport pawl 1 or pawl 18 and the transport toothing 17 the switching disk 4 on the other hand is not prevented that the switching disk 4 in the direction of the arrow 12 can be rotated by hand. For this purpose smü also two stops 19 and 20, through which the Transport link ί among other things is guided like this far apart that the transporters k, 1 the desired movement when disengaging from the transport toothing 17 with manual adjustment of the Carry out switching disk 4 ^ n.

Anstatt der Zugfeder iS kann selbstverstandhca eine Druckfeder Verwendung finden, die dann nur entsprechend anders gelagert sein muß.Instead of the tension spring iS can of course be approx find a compression spring use, which then only needs to be stored accordingly differently.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims

Claim:

Device ram braking a mechanical stepper drive on one also by hand rotatable cam switch disc, in the toothing of which a freely rotating flywheel braked transport pawl engages positively, especially with electromechanical Program switches, marked by, that the transport pawl (1) - as known per se - formed in one piece and that they are guided between stops (19, 20) so that they can be used to manually operate the switching disk (4) against the train of the spring (16) can be disengaged from the switching teeth without except To get hold of the flywheel (3).

men. According to the invention, the above object is achieved in that the transport pawl - like known per se - formed in one piece and that it is guided between stops that it can be used to manusllen Actuation of the switching disc against the tension of the spring can be disengaged from the switching teeth, without disengaging from the flywheel.

The invention relates to a device for braking a mechanical stepper drive on a cam indexing disk that can also be rotated by hand, in their teeth a transport pawl braked by a freely rotating flywheel engages positively, especially in the case of electromechanical program switches.

With known steps it is necessary to to strictly adhere to the step length to carry out transpott steps. Lei application of one Stepping drive in a program switch causes non-compliance with defined step lengths imprecise actuation of the individual electrical switches by the existing cam disk or -roller. This can either have the consequence that the contact surfaces of the switches are disproportionate burn quickly, or that the program stored in the cam switch is not precisely followed. It often happens that the program roller or disk in the cam switch is so strong is accelerated so that it moves a little further than corresponds to the actual program step would; one then speaks of the so-called »throwing over« the program disc or -roller. This effect is mainly due to the M ^ - sensor acceleration that cannot be broken down quickly enough.

In French patent 1,574,402 a «: Device for braking a mechanical stepper drive described. With this well-known However, the device is alternately accelerated and decelerated again and thus A wheel exposed to high wear in connection with a mass lever as a braking device used.

The device is also quite expensive because the pawl and stepping lever are separate parts that have to be put together during assembly.

Based on this known device, the invention is based on the object of one less to create expensive device, which is also subject to less wear. With manual When the switching disc is actuated, the transport pawl should be able to be disengaged from the switching toothing, without disengaging from the flywheel.

knew device on the further advantage that the walking speed by selecting the size (or mass or shape) of the additional flywheel itself can be predetermined. A hurling the switching disk is thus avoided in a simple manner. There is only a single flywheel is used to brake the transport pawl, switching noises are considerably reduced. The free run-out of the flywheel enables extremely low wear on the gears

ao of pawl and flywheel toothing. A bouncing of the switching disk or a corresponding one Roller actuated switch contacts is significantly limited by the fact that just starting the switching disk is braked. Because often at the beginning of each switching step no program contacts are operated, but this happens a little later, reaches the known Device too high speeds right from the start, so that bouncing of the contacts is inevitable is.

The invention is illustrated using an example explained with the help of a drawing. The subject of the invention is based on a linearly movable Transport latch described; the invention is

but also applicable to other stepper drives, such as B. on eccentric gear ^ transport pawls or the like.

A switching disk 4, which carries either cams or slots 5, which in turn is scanned by scanning levers 6 which in turn are part of

tern are intended as an exemplary embodiment of a control be moved step by step by a transport pawl 1. The transport pawl 1 is of a Tensioning disk 7, which rotates in the direction of an arrow 13, against the spring force of a compression spring 15 preloaded. As soon as the tensioning disk 7 releases the transport pawl 1 again, the latter will be with With the help of the compression spring lfi moved abruptly in the direction of an arrow 14, a transport step of the Switching disk 4 is carried out.

The transport pawl also has a toothing B, which, when the pawl 1 is pretensioned, engages with a toothing 9 of a freely rotatable flywheel 3 stands. When carrying out a transport step by the transport pawl 1, the Flywheel 3 over the two gears 8 and 9 in the direction of an arrow; 1Φ; rotated.

The toothing 8 on the transport jib 1 is arranged on this in such a way and its length is dimensioned in such a way that that shortly before the end of the transport step, the teeth 8 with the teeth 9 of the Flywheel 3 disengages. This allows the accelerated wheel 3 to coast down freely.

Will the transport pawl I go through the tension washer? preloaded again, it can happen that the two gears 8 and 9 do not immediately engage correctly, because possibly One tooth on another. To avoid this difficulty, the axis of the flywheel 3 is under auxiliary