DE3229678C1

DE3229678C1 - Film transport mechanism in a still camera for circular film discs

Info

Publication number: DE3229678C1
Application number: DE19823229678
Authority: DE
Inventors: Alfred 8000 München Winkler
Original assignee: Agfa Gevaert AG
Current assignee: Agfa Gevaert AG
Priority date: 1982-08-10
Filing date: 1982-08-10
Publication date: 1983-11-24

Abstract

A film transport mechanism in a still camera for circular film discs, which are produced in flat cassettes, can be inserted in a cassette chamber that can be accessed via a lid which is provided on a camera flat side and can be locked by a lid lock, can be transported in steps by equal angular amounts and in this case can preferably be driven at their hub, is to be constructed such that there is no need for separate clamping or transport manipulations without the use of an electric motor. It is provided for this purpose that there is present as the drive device a spring work (13, 14, 17; 13, 25, 17) which can be clamped to a clamping part (13) and whose output member (17, 19) can be released in steps in order to achieve a driving effect, there being provided between the lid (2) or the lid lock and the clamping part (13) a transmission (8, 6, 10, 11, 12) by means of which the movement of the lid (2) or lid lock during cassette replacement is converted into a clamping movement for the clamping part (13), and there being connected to the output member (19) which can be released in steps a coupling part (5) which projects into the cassette chamber (3) and is intended to engage with the drive member of the film disc, preferably its hub (1a), upon insertion of a cassette (1). <IMAGE>

Description

Der Schieber 6 trägt eine Zahnstange 6b, die mit The slide 6 carries a rack 6b, which with

einem Ritzel 10 in Eingriff steht. Mit dem Zahnrad 10 ist eine Kurbel 11 drehfest verbunden, auf der eine Schubklinke 12 gelagert ist Eine Spannscheibe 13 eines am einen Federende 14a spannbaren und am anderen Federende 14b zum Antrieb freisetzbaren Federwerks 14 weist einen Spiralnocken 13a mit einer radialen Antriebsflanke 13b und eine Rastkerbe 13c auf. Mit der Kurve 13a bzw.a pinion 10 is engaged. With the gear 10 is a crank 11 non-rotatably connected, on which a thrust pawl 12 is mounted. A tensioning disk 13 one at one spring end 14a tensionable and at the other spring end 14b for driving releasable spring mechanism 14 has a spiral cam 13a with a radial drive flank 13b and a locking notch 13c. With the curve 13a resp.

Flanke 13b wirkt die Schubklinke 12 zusammen. Zum Stillsetzen der Spannscheibe 13 während des Ablaufs des Federwerkes 14 dient ein schräger, unter der Wirkung einer Feder 15 stehender Sperrzahn 16.Flank 13b, the pawl 12 works together. To stop the Tensioning disk 13 during the expiry of the spring mechanism 14 is an oblique, under the action of a spring 15 ratchet tooth 16 standing.

Das freizusetzende Federende 14b ist an einer Kupplungsscheibe 17 befestigt, die eine Verzahnung 17a aufweist, die unter der Wirkung einer Druckfeder 18 normalerweise in Eingriff steht mit einer komplementären Verzahnung 19a einer zweiten Kupplungsscheibe 19. Beide Kupplungsscheiben 17, 19 bilden eine Überlastkupplung. An der Kupplungsscheibe 19, mit der das Antriebszahnrad 5 für die Filmscheibennabe la drehfest verbunden ist, ist noch eine Sperrverzahnung 19b vorgesehen, mit der eine Sperrklinke 20 zusammenwirkt. The spring end 14b to be released is on a clutch disk 17 attached, which has a toothing 17 a, which is under the action of a compression spring 18 is normally in engagement with a complementary toothing 19a of a second clutch disk 19. Both clutch disks 17, 19 form an overload clutch. On the clutch disc 19, with which the drive gear 5 for the film disc hub la is rotatably connected, a locking toothing 19b is also provided with the a pawl 20 cooperates.

Gemäß F i g. 1 ist die Federwerksfeder 14 als Spiralfeder ausgebildet. Die Spannscheibe 13 und die federseitige Kupplungsscheibe 17 tragen an ihren einander zugewandten Seiten einander zugeordnete Anschläge 13d und 17b, wobei im voll oder teilweise gespannten Zustand des Federwerkes die hintere Anschlagkante des Anschlags 17b der Kupplungsscheibe 17 von der in Spannrichtung vorderen Kante des Anschlags 13d der Spannscheibe 13 einen definierten größeren oder kleineren Winkelabstand hat. According to FIG. 1, the spring mechanism spring 14 is designed as a spiral spring. The tensioning disk 13 and the spring-side clutch disk 17 wear each other on their facing sides associated stops 13d and 17b, in full or partially tensioned state of the spring mechanism the rear stop edge of the stop 17b of the clutch disc 17 from the front edge of the stop in the tensioning direction 13d of the clamping disk 13 a defined larger or smaller angular distance Has.

Die Wirkungsweise der Anordnung nach F i g. list nun folgende: Wird der Deckel 2 durch Schwenkung im Uhrzeigersinn geschlossen, so schiebt die Kurbelstange 8 am linken Ende des Schlitzes 6a den Schieber 6 samt Zahnstange 6b in Richtung des Pfeiles 21. Das Ritzel 10 wird dabei zusammen mit der Kurbel 11 und der Schubklinke 12 infolge der Zuordnung von Zahnstange 6b und Ritzel 10 um 360" gedreht. Dabei nimmt die Schubklinke 12 an der Flanke 13b die Spannscheibe 13 um 360" im Uhrzeigersinn mit, wobei die hintere Kante der Kerbe 13c den Sperrzahn 16 an dessen flacher Schräge 16a zuvor ausgehoben hat. Nachdem die Scheibe 19 gegen Drehung gesperrt ist, wird bei Drehung der Spannscheibe 13 im Uhrzeigersinn das Federwerk 14 gespannt, und zwar normalerweise um eine volle Drehung, so daß es anschließend auch insgesamt um eine volle Umdrehung ablaufen und eine Filmscheibe voll transportieren kann. Dabei legt sich schließlich der Anschlag 13d etwa an den Anschlag 17b an. Der Sperrzahn 16 springt in die Kerbe 13c erneut ein und sperrt infolge seiner Steilflanke 16b die Spannscheibe 13 entgegen einem Rücklauf entgegen der Spannrichtung. The mode of operation of the arrangement according to FIG. list now the following: Will if the cover 2 is closed by pivoting it clockwise, the connecting rod pushes it 8 at the left end of the slot 6a the slide 6 together with the rack 6b in the direction of arrow 21. The pinion 10 is together with the crank 11 and the pawl 12 rotated by 360 "as a result of the association of rack 6b and pinion 10 the pawl 12 on the flank 13b takes the tensioning disk 13 360 "clockwise with, the rear edge of the notch 13c the ratchet tooth 16 on its flat slope 16a previously excavated. After the disc 19 is locked against rotation when the tensioning disk 13 is rotated clockwise, the spring mechanism 14 is tensioned, and normally by a full turn, so that it is then also a total of can run through a full turn and fully transport a film disc. Finally, the stop 13d comes into contact with the stop 17b. The ratchet 16 jumps into the notch 13c again and locks as a result of its steep flank 16b the tensioning disk 13 against a return against the tensioning direction.

Wird der Deckel 2 nicht voll geschlossen und wieder geöffnet, so ist dabei der Sperrzahn 16 noch nicht erneut in die Kerbe 13c eingefallen. If the cover 2 is not fully closed and opened again, so the ratchet tooth 16 has not yet again sunk into the notch 13c.

Damit läuft das unvollkommen gespannte Federwerk 14 spannscheibenseitig um das unvollkommen gespannte Winkelstück zurück und nimmt bei erneut geöffnetem Deckel 2 wieder seine Ausgangsstellung vor dem Spannen bzw. teilweisen Schließen des Deckels 2 ein. Ist dagegen das Federwerk 14 gespannt und wird der Deckel 2 wieder geöffnet, ohne daß Aufnahmen auf einer eingelegten Filmscheibe bzw. Kassette 1 gemacht worden sind bzw. nachdem nur einige Aufnahmen belichtet und transportiert worden sind, dann liegen die Anschläge 13d, 17b eng beisammen oder nur ein der Zahl der gemachten Aufnahmen entsprechendes Winkelstück auseinander. Wird nun der Deckel 2 wieder voll geschlossen, so daß die Spannscheibe 13 um 360" gedreht wird, dann wird bei Erreichen der vollen Federspannung vor Drehung der Spannscheibe 13 um 360" über die Anschläge 13d, 17b die federseitige Kupplungsscheibe 17 mitgenommen. Dies ist möglich, weil die hierbei auftretende Mitnahmekraft bzw. ihre Komponente auf die Flanken der Verzahnungen 17a, 19a größer ist als die Kraft der Druckfeder 18 bzw. The imperfectly tensioned spring mechanism 14 thus runs on the tensioning disk side back to the imperfectly tensioned contra-angle handpiece and, when it is opened again, takes Lid 2 returns to its original position before tensioning or partial closing of the cover 2. If, however, the spring mechanism 14 is tensioned and the cover 2 is again opened without taking pictures on an inserted film disc or cassette 1 have been or after only a few pictures have been exposed and transported are, then the stops 13d, 17b are close together or only one of the number of Take apart the corresponding elbow. Will now be the lid 2 fully closed again, so that the tensioning disk 13 is rotated 360 ", then is when the full spring tension is reached before turning the tensioning disk 13 by 360 " The spring-side clutch disk 17 is carried along via the stops 13d, 17b. this is possible because the entrainment force occurring here or its component on the flanks of the toothings 17a, 19a is greater than the force of the compression spring 18 respectively.

deren Kraftkomponente auf die Zahnflanken dieser Verzahnungen. Also gleiten unter der tangentialen Kraft der auf die Kupplungsscheibe 17 einwirkenden Spannscheibe 13 die Zahnflanken der Stirnradverzahnungen 17a, 19a übereinander weg. Das Federwerk 14 wird also auch in einem derartigen Fall immer nur auf sein für den vollen Transport einer Filmscheibe erforderlichen Betrag gespannt.their force component on the tooth flanks of these gears. So slide under the tangential force acting on the clutch disc 17 Clamping disk 13 the tooth flanks of the spur gear teeth 17a, 19a one above the other away. In such a case, the spring mechanism 14 will only be open for the full transport of a film disc required amount tensioned.

Zur Auslösung des Federwerkes 14 für einen Transport einer Filmscheibe um ein Bild ist hier nur eine U-förmige Klinke 20 gezeigt. Gibt sie einen Zahn der Verzahnung 19b frei, so fällt sie sofort hinter einem anderen ein; gibt sie diesen frei, so fällt sie zwei Zähne hinter dem zuerst freigegebenen Zahn erneut ein. Ein Bildschritt wäre hier also durch den Ablauf der Scheibe 19 um zwei Schaltzähne der Verzahnung l 9b in Spannrichtung, also im Uhrzeigersinn bestimmt. Es sind aber alle bei Federwerks-Filmtransportvorrichtungen bekannten Auslösemechanismen möglich, wobei mittels eines Auslösers zuerst der Verschluß betätigt werden und dann durch den ablaufenden Verschluß das Federwerk für einen Bildschritt freigegeben werden kann oder umgekehrt. Auch ist es möglich, zur genauen Fixierung der Bildlage in der Kamera zusätzlich einen bekannten Taster mit einem je Bild vorgesehenen Perforationsloch in der Filmscheibe bzw. der Kassette 1 zusammenwirken zu lassen und diesen auf irgendeine bekannte Weise vor einem neuen Filmtransport wieder auszuheben. Wenn das Federwerk 14 bzw. die Spannscheibe 13 infolge von Übersetzungen um weniger als 360" gespannt werden müssen, wobei nur Winkelwege in Frage kommen, durch die 360" teilbar sind, dann ist die Übersetzung zwischen Zahnstange 6b und Zahnrad 10 entsprechend zu wählen und es sind eine entsprechende Zahl von Flanken 13b und Kerben 13c an der Spannscheibe 13 vorzusehen sowie die Winkelabstände der Anschläge 13d, 17b entsprechend zu berechnen. To trigger the spring mechanism 14 for transporting a film disc only one U-shaped pawl 20 is shown here for one picture. Gives them a tooth of Toothing 19b free, it falls immediately behind another; she gives this free, it falls back two teeth behind the first released tooth. A Image step would be here by the expiration of the disk 19 by two shift teeth Toothing l 9b determined in the tensioning direction, that is, clockwise. But they are all trigger mechanisms known from spring mechanism film transport devices possible, whereby the shutter is operated first by means of a trigger and then by the running shutter release the spring mechanism for one image step can or vice versa. It is also possible to precisely fix the image position in the camera also has a known button with a perforation hole provided for each image to let cooperate in the film disc or the cassette 1 and this on any known way to be lifted again before a new film transport. When the spring mechanism 14 or the tensioning disk 13 is tensioned by less than 360 "as a result of translations must be, whereby only angular paths come into question, by which 360 "are divisible, then the translation between rack 6b and gear 10 must be selected accordingly and there are a corresponding number of flanks 13b and notches 13c on the clamping disc 13 and to calculate the angular distances of the stops 13d, 17b accordingly.

Bei der Ausführungsform nach F i g. 2 sind alle mit denselben Bezugsziffern wie in F i g. 1 versehenen Teile gleich ausgestaltet wie in F i g. 1. Unterschiedlich hiervon ist jedoch die Ausbildung des Federwerks selbst und der Sicherung gegen Überspannen des Federwerks. In the embodiment according to FIG. 2 are all with the same reference numbers as in Fig. 1 provided parts configured the same as in F i g. 1. Different of this, however, is the formation of the spring mechanism itself and the protection against Overstretching the spring mechanism.

Die Beschreibung zu Fig. 2 wird deshalb hierauf beschränkt.The description of FIG. 2 is therefore restricted to this.

In Fig.2 ist die Federwerksfeder 25 als einseitig gehäusefeste und um eine Riemenscheibe 26 mehr oder weniger schlingbare Zugfeder ausgebildet. Die Riemenscheibe 26 ist mit der drehbar im Gehäuse 4 gelagerten Getriebeachse 9 fest verbunden. Die Spannscheibe 13 und die Kupplungsscheibe 17 tragen je ein gleiches Zahnrad 13e, 17c mit Stirnradverzahnung, die auf einander zugewandten Seiten beider Scheiben liegen. In Figure 2, the spring mechanism spring 25 is fixed to the housing and on one side formed around a pulley 26 more or less loopable tension spring. the Belt pulley 26 is fixed to gear shaft 9 rotatably mounted in housing 4 tied together. The tensioning disk 13 and the clutch disk 17 each carry the same one Gear 13e, 17c with spur gear teeth, the mutually facing sides of both Disks lie.

Zwischen den beiden Scheiben 13, 17 ist auf der Achse 9 eine Schwinge 27 fest angeordnet, auf der eine gemeinsame Welle 28 für zwei gleiche Planetenräder 29, 30 gelagert ist. Je ein Planetenrad 29 bzw. 30 steht in Eingriff mit einem Zahnrad 13ebzw. 17c.Between the two disks 13, 17 there is a rocker on the axle 9 27 fixed on one common shaft 28 for two of the same Planet gears 29, 30 is mounted. One planet gear 29 or 30 is in mesh with a gear 13ebzw. 17c.

Wird beim Schließen des Deckels 2 die Spannscheibe 13 um 360" gedreht, so müssen infolge der stillgesetzten Kupplungsscheibe 17 die Planetenräder 29, 30 um die Kupplungsscheibe 17 umlaufen, wodurch die Schwinge 27 in Abhängigkeit von der Zahnradübersetzung beispielsweise um 1800 mitgenommen wird. Sie nimmt die Achse 9 zusammen mit der Riemenscheibe 26 um denselben Winkelbetrag mit, wodurch die Feder 25 aufgewickelt und damit gespannt wird. Ist jedoch das Federwerk 25 infolge nicht gemachter Aufnahmen auf der Seite des Zahnrades 5 zuvor nicht ausreichend entspannt worden, dann ist oder wird dessen Widerstand gegen eine Schwenkung der Schwinge 27 so groß, daß über die Planetenräder 29, 30 eine so große tangentiale Kraft auf das Zahnrad 17c ausgeübt wird, daß diese größer ist als die Andruckkraft der Feder 18. If the clamping disc 13 is rotated 360 "when the cover 2 is closed, as a result of the shutdown clutch disk 17, the planet gears 29, 30 revolve around the clutch disc 17, whereby the rocker 27 depending on the gear ratio is taken around 1800, for example. She takes the axis 9 together with the pulley 26 by the same angular amount, whereby the spring 25 is wound up and thus tensioned. However, the spring mechanism 25 is not as a result Recordings made on the side of the gear 5 previously not sufficiently relaxed then its resistance to pivoting of the swing arm is or will be 27 so large that on the planet gears 29, 30 such a large tangential force the gear 17c is exerted to be greater than the pressing force of the spring 18th

Somit findet eine Entkupplung der Überlastkupplung 17a, 19a in anhand von F i g. 1 beschriebener Weise statt, so daß sich dan4i die Scheiben 13 und 17 über ein entsprechendes Winkelstück gemeinsam drehen, wodurch der Spannungszustand der Feder 25 erhalten bleibt. Zweckmäßigerweise sind Endanschläge 26a, 4d zwischen der Riemenscheibe 26 und dem Gehäuse 4 vorgesehen. Bei dieser Ausführungsform läuft das Antriebszahnrad 5 zusammen mit den Scheiben 17 und 19 übrigens entgegen der Spannrichtung der Spannscheibe 13 ab, da sich die Schwinge 27 bei Auslösung des Filmtransports um den Spannweg zurückdreht.A decoupling of the overload clutch 17a, 19a thus takes place in FIG from F i g. 1 takes place, so that disks 13 and 17 Rotate together using a corresponding elbow, which creates the state of tension the spring 25 is retained. Appropriately, end stops 26a, 4d are between the pulley 26 and the housing 4 are provided. In this embodiment runs the drive gear 5 together with the disks 17 and 19, by the way, contrary to the Tensioning direction of the tensioning disk 13, since the rocker 27 when the triggering of the The film transport is turned back by the tensioning path.

Bei einem erfindungsgemäßen Filmtransportgetriebe könnte es nun vorkommen, daß ein Benutzer den Deckel 2 nur ein wenig öffnet, um eine Kassette 1 zu entnehmen, und dann der Schwenkwinkel des Deckels 2 nicht zum Spannen des Federwerkes 14 bzw. 25 bzw. der Spannscheibe 13 um den notwendigen Winkelweg ausreicht. Daher ist gemäß den Figuren mit dem Schieber 6 ein Nocken 6c verbunden. Auf der dem Kassettenraum 3 zugewandten Seite der Wand 4a ist eine Spreize mit zwei um feste Achsen 32, 33 schwenkbaren, durch eine Feder 34 verspannten Armen 35, 36 vorgesehen. Die Arme 35, 36 haben zwischen ihren Achsen einen gemeinsamen Angriffspunkt 37 für den Nocken 6c. Bei voll bzw. ausreichend geöffnetem Deckel 2 drückt der Nocken 6c auf den Angriffspunkt 37 und drückt daher die Enden 35a, 36a der Arme 35, 36 auseinander. Diese sind derart U-förmig ausgebildet, vgl. F i g. 4, daß sie den Rand einer in den Kassettenraum 3 eingelegten Kassette 1 an etwa diametralen Stellen übergreifen können. In der in F i g. 3 gezeigten, voll geöffneten Stellung des Deckels 2 werden die Enden 35a, 36a durch den Nocken 6c so weit auseinandergespreizt, daß eine Kassette 1 entnehmbar bzw. eine neue Kassette in den Kassettenraum 3 einsetzbar ist. Ist der Deckel 2 jedoch zu wenig geöffnet, um bei seinem Schließen die Spannscheibe 13 ausreichend drehen zu können, so ist auch der Nocken 6c aus dem Bereich des Angriffspunktes 37 verschoben, so daß die Enden 35a, 36a eine eingesetzte Kassette 1 übergreifen und das Entnehmen derselben bzw. das Einsetzen einer neuen Kassette verhindern. Somit ist ein Benutzer gezwungen, den Deckel 2 zum Kassettenwechsel voll zu öffnen, womit auch ein ausreichender Spannweg für das Federwerk beim Schließen des Deckels sichergestellt ist. In a film transport gear according to the invention, it could now happen that a user opens the lid 2 only a little to remove a cassette 1, and then the pivot angle of the cover 2 is not used to tension the spring mechanism 14 or 25 or the tensioning disk 13 is sufficient by the necessary angular path. Hence, according to In the figures, a cam 6c is connected to the slide 6. On the one in the cassette room 3 facing side of the wall 4a is a spreader with two axes 32, 33 fixed about pivotable arms 35, 36 braced by a spring 34 are provided. The poor 35, 36 have a common point of application 37 for the cam between their axes 6c. When the cover 2 is fully or sufficiently open, the cam 6c presses on the point of application 37 and therefore presses the ends 35a, 36a of the arms 35, 36 apart. These are like that U-shaped, see FIG. 4 that they are the edge of one in the cassette room 3 inserted cassette 1 can overlap at approximately diametrical points. In the in Fig. 3 shown, fully open position of the cover 2, the ends 35a, 36a spread so far apart by the cam 6c that a cassette 1 can be removed or a new cassette can be inserted into the cassette space 3. Is the lid 2 however, it is not opened enough for the tensioning disk 13 to be sufficient when it is closed To be able to rotate, the cam 6c is also out of the area of the point of application 37 shifted so that the ends 35a, 36a overlap an inserted cassette 1 and prevent the removal of the same or the insertion of a new cartridge. Thus, a user is forced to fully open the cover 2 to change the cassette, which also means that there is sufficient tension for the spring mechanism when the lid is closed is ensured.

Es sind auch noch weitere, der Einfachheit halber nicht gezeigte Ausführungsbeispiele nach der Erfindung möglich. So könnte an die Stelle der Kurbelstange 8 und der Zahnstange 6b zur Kraft- bzw. Bewegungsübertragung zwischen Deckel 2 und Spannscheibe 13 ein Zahnradgetriebe treten, dessen erstes Zahnrad auf der Deckelachse 7 gelagert sein könnte. Gegebenenfalls müßte hierbei an einer Getriebestelle ein Kegelrad vorgesehen sein. Außerdem könnte als dem Spannen des Federwerkes 14 bzw. 25 dienendes, bei einem Kassettenwechsel automatisch zu betätigendes Kamerateil statt des Deckels 2 der Verriegelungsmechanismus für den Deckel Verwendung finden. Wenn dieser in bekannter Weise als Schieber (wie bei früher üblichen Kameras) ausgebildet ist, könnte er direkt als Teil des Schiebers 6 ausgebildet sein. Bei Verwendung eines ebenfalls bekannten Verriegelungsdrehteils könnte dieses u. U. beim Verriegeln direkt mit der Spannscheibe 13 zusammenwirken. Schließlich könnte zum Spannen des Federwerkes auch die Öffnungsbewegung des Deckels oder Deckelriegels herangezogen werden. There are also more, not shown for the sake of simplicity Embodiments possible according to the invention. So could take the place of the connecting rod 8 and the rack 6b for the transmission of force or movement between the cover 2 and Tensioning disk 13 a gear drive, the first gear on the cover axis 7 could be stored. If necessary, this would have to be at a gear point Bevel gear may be provided. In addition, the tensioning of the spring mechanism 14 or 25 camera part that is used and can be operated automatically when the cassette is changed instead of the cover 2, the locking mechanism for the cover is used. If this is designed in a known manner as a slide (as with cameras that were customary in the past) it could be formed directly as part of the slide 6. Using a likewise known locking rotary part, this could under certain circumstances when locking interact directly with the tensioning disk 13. Finally, it could be used to tension the Spring mechanism also used the opening movement of the lid or lid latch will.

Claims

Claims: 1. Film transport gear in a still camera for circular disk-shaped film disks assembled in flat cassettes, the into a lockable with a cover bolt provided on a camera flat side Lid accessible cassette space can be used and incrementally by equal angular amounts transportable and preferably at - their hub can be driven, as Drive device, a spring mechanism (13, 14, 17; 13, 25, 17) is provided which is connected to a clamping part (13) can be clamped and its driven part (17, 19) gradually to Achieving a drive effect can be released, and with the output part (19) a coupling part (5) protruding into the cassette space (3) for engagement with a drive member of the film disk, preferably its hub (1al when inserting a cassette (1), characterized in that between the lid (2) or the ceiling bolt and the clamping part (13) a gear (8, 6, 10, 11, 12) is provided, through which the lever (8), rack (6b) and pinion (10) Movement of the lid (2) or lid latch when changing the cassette in a clamping movement for the clamping part (13) is converted, and that the gear has a translation, by the with a certain minimum path of movement of the lid (2) or lid latch a rotation of the clamping part (13) can be achieved to rotate a film disk to achieve 360 "required spring tension, the one on the output side Overload clutch (17, 18, 19) limits 2. film transport gear according to claim 1, characterized characterized in that the clamping part (13) is designed as a clamping disk, which only drivable in the direction corresponding to the tensioning direction of the spring mechanism (14; 25) is and cooperates with a locking device (13c, 16) through which it after each a rotation about that for tensioning the spring mechanism (14; 25) for the purpose of rotating a film disk 360 "required angular path can be blocked against return.

3. Film transport gear according to one of the preceding claims, characterized in that between the releasable end (17) of the spring mechanism (14; 25) and the coupling member (5) on the cassette space side, the overload clutch (17, 19, 18) is provided and that between the clamping part (13) and the spring-side Coupling element (17) of the overload clutch (17, 19, 18) driver (13d, 17b) is provided through which upon reaching or

Exceeds what is required to rotate a film disc 360 " Spring tension is a force that decouples the overload clutch (17, 19, 18) 4. Film transport gear can be transferred to the spring-side coupling element (17) according to any other of the preceding claims, characterized in that the through the cover (2) or the cover latch when moving the rack (6b) with the transmission pinion (10) is in engagement, and that with the gear (10) a crank (11) is rotatably connected, which has a pawl (12) for driving the Tensioning disk (13) on a drive flank (13b) of a spiral cam (13a).

5. Film transport gear according to one of the preceding claims, characterized in that the tensioning disc (13) at regular angular intervals, each of which corresponds to a clamping process, drive flanks to interact with the pawl (12) and has correspondingly arranged notches (13c), in the one resilient, more effective against the direction corresponding to the tensioning direction Ratchet tooth (16) is able to collapse after a tensioning process.

6. Film transport gear according to one of the preceding claims, characterized in that a push rod (8) is articulated on the cover (2) which engages with a pin (8a) in a slot (6a) of the rack (6b).

7. Film transport gear according to one of the preceding claims, characterized in that the overload clutch (17, 19, 18) consists of two clutch disks (17, 19) with interlocking teeth (17a, 19a) with triangular teeth consists, which can be held in engagement with one another by an axially acting compression spring (18) and by the tangentially acting thrust of the driver (13d, 17b) in their Exceeding one due to the inclination of the tooth flanks and the force of the compression spring (18) predetermined size can be pushed out of engagement.

8. film transport gear according to claim 1, characterized in that that the spring mechanism (14) is formed by a spiral spring (14), one end of which (14a) on the clamping disc (13) and its other end (14b) on the spring-side Clutch disc (17) of the overload clutch (17, 19, 18) is attached.

9. film transport gear according to claim 1, characterized in that that the spring of the spring mechanism by a more or less to one with the output part (17) coupled pulley (26) wound tension spring (25) is formed.

10. Film transport gear according to claim 1 or any other of the preceding claims, characterized in that on the clamping disc (13) and the spring-side clutch disc (17) in the fully or partially expired state of the spring mechanism (14) angularly spaced apart, in engagement with one another Coming drivers (13d, 17b) are provided so that when the tensioning of the only partially expired spring mechanism by the tensioning disk-side driver (13d) during a remaining travel of the constant tensioning travel the spring-side clutch disc (17) can be brought into its starting position via the overload clutch.

11. Film transport gear according to claim 1 and 9, characterized in that that on the clamping disc (13) and the spring-side clutch disc (17) each one the same gear (13e, 17c) are arranged that between the two disks (13, 17) a rocker (27) of an epicyclic gear mounted on the common, rotatable axle (9) is arranged, which has a shaft (28) for each with the same gears (13e) meshing, same planet gears (29, 30) carries so that the same gears (13e, 17e) and the same planet gears (29, 30) together the driver between the clamping disc (13) and the clutch disc (17).

12. Film transport gear according to one of the preceding claims, characterized in that to ensure the minimum path of movement of the lid (2) in the cassette space (3) scissor-shaped or spreader-shaped retaining clips (35, 36) for one Cassette (1) are pivotably mounted by a with the Lid (2) coupled opening device with the lid (2) open in a one Cassette (1) releasing position are movable so that a cassette (1) the cassette space (3) only when the spring mechanism (14; 25) is sufficiently open for a tensioning process Lid (2) is removable.

13. Film transport gear according to claim 12, characterized in that that the opening device on the scissors or spreader arrangement (35, 36) counter to the action of a return spring (34) the same acting during the movement of the lid (2) or lid latch movable cam (6c).

14. Film transport device according to claims 12 and 13, characterized characterized in that the cam (6c) is arranged on the rack (6b).

The invention relates to a film transport gear in a still camera for circular disk-shaped film disks assembled in flat cassettes, the in one through one on. a camera flat side, which can be locked with a cover latch Lid accessible cassette space can be used and incrementally by equal angular amounts are transportable and preferably drivable at their hub, as Drive device, a spring mechanism is provided, which can be tensioned on a clamping part and its output part can be released gradually to achieve a driving effect is, and wherein with the output part, a coupling part protruding into the cassette space for engaging a drive member of the film disk, preferably its Hub that is connected when inserting a cassette.

Cameras of this type with appropriate film transport gears are known, an electric motor being used in each case to drive the film disc.

The known cameras of this type make use even then and thus the purchase of high-quality batteries is necessary when using an electronic one Exposure control device and a built-in electronic flash are dispensed with. Mechanical transport gears that are common with other types of cameras can be used train them in such a way that they can also be used for the camera type mentioned above, but had the disadvantage compared to the cameras of the type mentioned above that before each recording a transport handle would have to be operated or the cover to Tensioning a spring mechanism must be actuated several times, see DE-GMS 8205 542 or DE-PS 8 15 298.

The invention is based on the object of a film transport gear to create of the type mentioned, through which an electromotive film transport Operationally comparable image transport solely through what is already necessary Closing the camera cover is enabled.

According to the invention, this object is achieved by the features of Main claim. Further advantageous features of the invention are set out in the subclaims removable.

The invention enables the tensioning of a spring mechanism for film transport without overloading and without additional tensioning process solely due to the movement the camera cover or a cover latch possible. It is possible to achieve that an inserted cassette is only released for removal when the camera cover is sufficiently open that its pivoting movement when closing or possibly even when opening it is sufficient for re-tensioning a film transport spring mechanism is.

The invention is explained in more detail with reference to drawings. It shows F i g. 1 is a perspective illustration of a basic arrangement of an inventive Film disk transport gear, FIG. 2 a section through one in individual Details compared to the arrangement according to FIG. 1 modified embodiment of the invention, F i g. 3 is a view showing an arrangement of a film cassette room in connection with FIG a transport gear according to Fig. 1 or Fig. 2, F i g. 4 shows a detail of the arrangement according to FIG F i g. 3 according to section line IV-IV.

In all figures, the same parts have the same reference numbers provided, so that as far as these parts are compared with each other in the individual figures can be.

This is based on a flat cassette 1 for the figures invisible, circular film discs that are evenly angularly spaced carry rectangular image fields. There is a central hole in one flat side of the cassette provided, which is formed by a connected to the film disk, drivable hub la will. According to the present example according to Figure 3, the cassette 1 is in the by the open cover 2 open cassette space 3 of a flat camera 4 inserted and is therefore only indicated by dash-dotted lines. Your hollow hub 1a is the one in the wall 4a of the cassette space 3 arranged drive gear 5 to turn, wherein the one Internal toothing having hollow hub la comes into drive engagement with gearwheel 5. For the sake of better illustration, FIG. 1 the wall 4a is omitted and the gear 5 only schematically on the output side of the transmission according to the invention been placed while in practice gear 5 and wall 4a also in the arrangement according to FIG. 1 would have to assume the position shown in Figure 2, with either the later slider 6 to be described as in FIG. 2 also with the arrangement according to FIG. 1 from the cassette room or. Cover side extend to the clamping side of the gear would have or the gear 5 according to F i g. 1 connected to the output by means of a hollow shaft and in front of the clamping part in the area of the space 3 that can be closed by the cover 2 should be arranged.

Such adjustments are in the ability and in the choice of one Of ordinary skill in the art, so that the inaccuracy in FIG. 1 of the better Due to displayability could be accepted.

According to FIGS. 1 and 3, the cover 2 is around pin 7 for closing of the cassette compartment 3 clockwise or counterclockwise to open to pan. In Fig. 2 the cover axis is not visible.

A connecting rod 8 is articulated on the cover 2, with a pin 8a engages in a straight slot 6a of the slide 6. When swiveling the lid 2, as a result of the crank movement of the crank 8, the slide 6 is straight and perpendicular to the cover axis 7 and to the imaginary or existing gear axis 9 or

Axis of the film disk moved as soon as the pin 8a on the corresponding At the end of the slot 6a.