CH287246A

CH287246A - Cinematographic camera.

Info

Publication number: CH287246A
Authority: CH
Inventors: S A Paillard
Original assignee: Paillard Sa
Priority date: 1950-09-16
Filing date: 1950-09-16
Publication date: 1952-11-30

Description

Appareil de Prise de vues einematographiques. La presente Invention a potir objet un appareil de Prise de vues cinemutographiques comprenant un dispositif de declencheinen.t et de blocage de son mecanisme d'entraine- ment du film muni d'un organe de man(eu- vre et. un obturateur variable. Cinematographic camera. The present invention has the object of a cinematographic camera comprising a device for triggering and blocking its film drive mechanism provided with a maneuvering member and a variable shutter.

0n connait dejä certains appareils de Prise de vties cineniatographiqaes munis d'tin obturateur variable, cependant cetix-ei pre- sentent certains inconvenients dont les prin- cipaux sont cites ei-dessous 1 Lorsque 1'obturateur est completement ferme, 1'appareil Petit continuer ä tourner, 1e blocage du mecanisme d'entrainement du film ne s'effectuant que par 1e dispositif de declenchement, independant de la commande de 1'obturateur variable. Si 1'operateur exe- cute un fondu de fermeture, il ne sait pas exactement ä quel moment il doit arreter la Prise de vues, ne sachant pas quand 1'obtura- teur est fei-mA. Lors dun fondu d'ouv erture, il doit d'abord mettre en marche 1e m6ca- nisme avant de manoetivrer l.'obturateur va riable. Cette maniere de faire est delicate, en outre, plusieurs Images ne seront pas expo- sAes, d'oü perte de film. Un autre incciive- nient reside dann 1e fait que, si 1'operateur ne contröle pas la Position de 1'obturateur va riable avant ehaque scene, une Prise de v ues peut eire faite involontairement av ee obtu- rateur ferme. We are already aware of certain cineniatographic filming devices equipped with a variable shutter, however these have certain drawbacks, the main ones of which are listed below. 1 When the shutter is completely closed, the device to rotate, the blocking of the film drive mechanism being effected only by the release device, independent of the control of the variable shutter. If the operator performs a fade out, he doesn't know exactly when to stop shooting, not knowing when the shutter is closed. When fading in, he must first start the mechanism before operating the variable shutter. This way of doing things is delicate, moreover, several Images will not be exposed, hence the loss of film. Another drawback is that if the operator does not check the Variable Shutter Position before each scene, a shot may be taken unintentionally with the shutter closed.

2 L'appareil s'arrete automatiquement ä la fermeture de 1'obturateur, mais doit eire remis en marche en actionnant 1'organe de manoeuvre du dispositif de declenehement. Comme preeedemment, 1.a manceüvre est deli- eate et plusieurs Images sont perdues Tors du fondu d'ouverture. 2 The apparatus stops automatically when the shutter closes, but must be restarted by operating the operating device of the release device. As before, the move is released and several frames are lost during the fade in.

3 Certains appareils, munis d'un obtu- rateur variable, possedent un dispositif indi- quant dann le viseur la Position de 1'obtura- teur. Cette soltltion a 1'inconvenient de dis traire l.'operateur Pendant la Prise de vues, son attention etant retenue par 1'indication de 1'obturateur au detriment de la scene fil- mee. En outre, elle est irriprecise, la Position du repere dans 1e viseur ne correspondant que rarement a,vee la Position reelle de 1'ob- turateur. Enfin, cette solution n'elimine pas 1e facteur reflexe de 1'operateur, faeteur qui Beul determine 1'instant reel du blocage du mecanisme d'entrainement du film. 3 Some cameras, equipped with a variable shutter, have a device indicating in the viewfinder the position of the shutter. This solution has the disadvantage of distracting the operator during the shooting, his attention being retained by the indication of the shutter to the detriment of the filmed scene. Furthermore, it is imprecise, the position of the reference mark in the viewfinder only rarely corresponding to the real position of the shutter. Finally, this solution does not eliminate the reflex factor of the operator, a factor which Beul determines the real instant of blocking of the film drive mechanism.

L'appareil selon 1'invention eise ä reme- dier aux inconvenients precites. 11 est. carac- terise par 1e fait qu'il. comprend un second dispositif de deelenchement et de blocage de son mecanisme d'entrainenent, independant du Premier, ce second dispositif d'enclenche- ment et de blocage etant actionne par 1'or- gane de commande de 1'obttirateur variable, la Position de blocage de ce second dispositif eorrespondant ä la Position obturateur ferme dudit organe de commande. The apparatus according to the invention overcomes the aforementioned drawbacks. 11 is. characterized by the fact that it. comprises a second triggering and blocking device for its drive mechanism, independent of the First, this second triggering and blocking device being actuated by the control member of the variable shutter, the position of the blocking of this second device corresponding to the closed shutter position of said control member.

Le dessin annexe represente, ä titre d'exemple, trois formes d'execution de 1'appa- reil faisant 1'objet de 1'invention. La fig. 1 est une coupe partielle dune Pre miere forme d'execution ä travers un meea- nisme de commande dun obturateur variable. The appended drawing shows, by way of example, three embodiments of the apparatus which is the subject of the invention. fig. 1 is a partial section of a first embodiment through a variable shutter control mechanism.

La fig. 2 est une coupe semblable ä Gelle representee ä la fig. 1, dune seconde forme d'execiition. _ La fig. 3 est une coupe selon III-III de la fig. 2 et la fig. 4 une coupe selon IV-IV de la fig. 2. fig. 2 is a section similar to Gelle shown in FIG. 1, of a second form of execution. _ Fig. 3 is a section along III-III of FIG. 2 and fig. 4 a section along IV-IV of FIG. 2.

La fig. 5 est une vLze en plan partielle de la tr oisieme forme d'execution. fig. 5 is a vLze in partial plan of the third form of execution.

La fig. 6 est une coupe selon VI-VI de la fig. 5 et la fig. 7 une v ue de cöte dans la direction de la flkhe VII de la fig. 5. fig. 6 is a section along VI-VI of FIG. 5 and fig. 7 a side view in the direction of arrow VII of FIG. 5.

Dans la Premiere forme d'execution repre- sent6e, 1'appareil de Prise de vues est muni d'un obturateur variable ä deux Aales 1 et 2 tournant suivant 1e meme axe de rotation. Le reglage de cet obturateur se fait en faisant varier la Position angulaire relative des Aales 1 et 2. Pour ceci, 1e mecanisme de commande de 1'obturateur comprend deux pignons co- axiaux 3 et 4 ä denture helicddale inversee Tune par rapport ä Fautre. Chacun des pi- gnons 3 et 4 est solidaire de Fune des Aales 1 et 2 de Fobturateur et engrene avec une rote 5, respectivement 6, ä denture correspondante. Ces rotes 5, respectivernent 6, font Partie d'un baladeur 7, susceptible d'etre ddplaee 1e long dun arbre 8, parallele ä. Faxe des pi- gnons 3 et 4, ä Faide dun Organe de com- mande non represente, dont un doigt s'en- gage Jans une Borge 9 du baladeur 7. In the first embodiment shown, the camera is provided with a variable shutter with two blades 1 and 2 rotating along the same axis of rotation. The adjustment of this shutter is done by varying the relative angular position of the blades 1 and 2. For this, the shutter control mechanism comprises two coaxial pinions 3 and 4 with reverse helical toothing one with respect to the other. Each of the sprockets 3 and 4 is integral with one of the blades 1 and 2 of the shutter and meshes with a rote 5, respectively 6, with corresponding teeth. These rotes 5, respectively 6, are part of a walkman 7, capable of being ddplaee the first along dun shaft 8, parallel to. Transmission of sprockets 3 and 4, with the aid of a control device not shown, one finger of which engages in a Borge 9 of slider 7.

L'arbre 8 portant 1e baladeur 7 est soli- daire d'un Support 10, dans lequel pivote en 11 une extremitd de Faxe 12 portant les pi- gnons 3 et 4. Lautre extremite de cet axe 12 pivote en 13 dans une autre Partie fixe de 1'appareil. The shaft 8 carrying the sliding gear 7 is integral with a Support 10, in which pivots at 11 one end of the axle 12 carrying the pinions 3 and 4. The other end of this axle 12 pivots at 13 in another Part fixed to the device.

Le pignon 3 entrainant la Aale 2 est soli- daire en rotation de laxe 12, tandis que le pignon 4 entrainant la Aale 1 est monte fou Sur laxe 12. Ainsi, en depla@ant le baladeur 7 1e long de 1'arbre 8, les rotes 5 et 6 qui en sont solidaires provoquent un deplacement angulaire des pignons 3 et 4Fun par räpport ä Fautre et de ce fait un deplacemerrt angu- laire relatif des Aales 1 et 2. The pinion 3 driving the Aale 2 is integral in rotation with the shaft 12, while the pinion 4 driving the Aale 1 is loosely mounted on the shaft 12. Thus, by moving the slider 7 first along the shaft 8, the wheels 5 and 6 which are integral with it cause an angular displacement of the pinions 3 and 4Fun with respect to each other and therefore a relative angular displacement of the Aales 1 and 2.

Des moy ens son prevus pour bloquer les pignons 3 et 4, lorsque le baladeur 7 arrive en fin de course, ä. 1a. Suite d'un deplacement dans une direction deternrinEe, provoquant la fermeture de Fobturateur, e'est-ä-dire la n rise en Position des Aales 1 et 2 telle qu'elles forment un disque ininterrornpu. Means ens its planned to block the sprockets 3 and 4, when the player 7 reaches the end of the race, ä. 1a. Following a displacement in a determined direction, causing the closing of the shutter, that is to say the n rise in Position of the Aales 1 and 2 such that they form an uninterrupted disc.

Dans la forme d'execution representde ä la fig. 1, ces moyens eomprennent une pike en matiere ä coefficient de frottement elevd, en 1'occurence une Tondelle de liege 14 enfi- lee Sur 1'arbre 8 et par 1'iritermediaire de la- quelle 1e baladeur 7 est destine ä venir s'ap- puyer contre le Support 10. In the embodiment shown in FIG. 1, these means comprise a pike made of material with a high coefficient of friction, in this case a cork clipper 14 threaded onto the shaft 8 and through which the slider 7 is intended to come. press against Support 10.

Lors du montage du meeanisrne represente ä la fig. 1, an regle 1'obturateur en Position de fermeture en desserrant les vis 15 desti- nees ä, bloquer la roue 5 par rapport au bala- deur, en appuyant 1e baladeur 7 contre la Tondelle 14, et en faisant tourner d'un angle voulu la roue dentee 5 par rapport au bala- deur 7. During assembly of the mechanism shown in FIG. 1, an adjusts the shutter in the closed position by loosening the screws 15 intended to block the wheel 5 with respect to the slider, by pressing the slider 7 against the roller 14, and by rotating it through an angle wanted the toothed wheel 5 with respect to the slider 7.

Le fonctionnement du rneeanisme decrit ei-dessus est 1e suivant ; Le doig t s'engageant dans la Borge 9 et commande soit meeaniquement, soit ä la main, deplace 1e baladeur 7 entre les deux parois du Support 10. Au monrent oü Fobturateur est ferme, le baladeur vient s'appuyer Sur la Tondelle de liege 14, occasionnarrt un frotte- ment supplementaire dans 1e mecanisme, ce qui a pour effet de bloquer eelui-ei, de meme que 1e mecanisme d'entrainement du film. Lors de Fouverture de Fobturateur, 1e bala- deur s'eloigne de la Tondelle 14 et 1e m6ca- nisme demarre arissit6t, ce qui debloque en meme temps 1e mecanisme dentrainement du film. The operation of the mechanism described above is as follows; The finger engaging in the Borge 9 and controlling either mechanically or by hand, moves the player 7 between the two walls of the Support 10. At the show where the shutter is closed, the player comes to rest on the cork tondelle 14, causes an additional friction in the mechanism, which has the effect of blocking eilui-ei, as well as the film drive mechanism. When the shutter is opened, the player moves away from the clipper 14 and the mechanism starts suddenly, which at the same time unlocks the film drive mechanism.

Dans la forme d'execution decrite ci-des- sus, lors du bloeage de Fobturateur, 1e meca- nisme d'entrainement du film s'arrete dans une Position quelconque. 0r, il peut etre inte ressant dans eertains eas d'arreter Faxe de griffe et Faxe de Fobturateur dans une Posi tion determinee et toujours la meine. Par exemple, pour effectuer un retour du film en agissant Sur la bobine debitrice, il faut que la griffe soit degagee du film. In the embodiment described above, when the shutter is locked, the film drive mechanism stops in any position. However, it can be interesting in certain cases to stop Claw Faxe and Shutter Faxe in a determined Position and always the same. For example, to return the film by acting on the delivery reel, the claw must be disengaged from the film.

Dans la seeonde forme d'execution repre- sentAe aux fig. 2 ä 4, 1'appareil de Prise de vues cinematographiques comprend un me- canisme d'entrainement de Fobturateur varia ble, du meme genre que celui represente ä la fig. 1. Toutefois, les moyens de blocage sont differents et permettent Farret du me- canisme d'entrainement du film dans une Po sition determinee. In the second embodiment represented in FIGS. 2 to 4, the cinematographic camera comprises a variable shutter drive mechanism, of the same type as that shown in FIG. 1. However, the blocking means are different and allow Farret of the film drive mechanism in a determined position.

En effet, ces moyens de blocage compren- nent une Partie excentrique 16 solidaire du pignon 4 et une pike de blocage susceptible de cooperer avee ladite Partie excentrique 16 pour bloquer les pignons 3 et 4. Dans la forme d'execution representee aux fig. 2 ä. 4, ladite pike est un levier 17 pivote en 18 Sur 1e Support 10. La Partie du levier 17 destinee ä cooperer avec la Partie excentrique 16 est formee par une plaquette 19 rapportee au moyen de vis 20 Sur un prolongement du levier 17. Un ressort 21 accroche, dune Part, au support. 10 et, d'autre Part, ä 1'extremite libre du levier 17 a tendance ä maintenir celui-ei en Position inactiv e. 0n plan incline 22 est prevu Sur 1e levier 17 pour cooperer avec un prolongement 23 du baladeur 7 (voir fig. 3 et 4). Indeed, these locking means comprise an eccentric part 16 integral with the pinion 4 and a locking pin capable of cooperating with said eccentric part 16 to lock the pinions 3 and 4. In the embodiment shown in FIGS. 2 ä. 4, said pike is a lever 17 pivoted at 18 on the support 10. The part of the lever 17 intended to cooperate with the eccentric part 16 is formed by a plate 19 attached by means of screws 20 to an extension of the lever 17. A spring 21 hooks, on the one hand, to the support. 10 and, on the other hand, at the free end of the lever 17 tends to maintain the latter in the inactive position. 0n inclined plane 22 is provided on the first lever 17 to cooperate with an extension 23 of the player 7 (see Fig. 3 and 4).

Le fonctionnement du dispositif ei-dessus dkrit est semblable ä celui du dispositif re- pr6sent6 en fig. 1. The operation of the device described above is similar to that of the device shown in FIG. 1.

Par contre, pour 1e blocage, lorsque 1e ba- ladeur 7 entraine par un doigt non repre- sent6 se rapproche du levier 17, son prolonge- ment 23, en entrant en contact avec 1e plan incline 22 provoque un deplacement du levier 17 Jans 1e sens de la flkhe 24 (fig. 4), ce qui a pour effet d'amener 1e bord de la plaquette 19 contre la trajeetoire de Fexcentrique 16. Le pignon 5 du baladeur 7 est regle de telle maniere qu'au moment oü 1e levier 17 a Bubi son deplacement maximum, 1'obturateur est entie- rement ferme. Dans cette Position du levier17 (Position dessink ä, la fig. 4), la plaquette 19 est reglee de maniere que son Bord morde lege- rement dans la trajectoire de 1'excentrique 16. Au moment du Passage de 1'excentrique 16 en regard de la plaquette 19, un eoincement se produit entre ces deux- pieces, ce qui a pour effet d'arreter 1e pignon 4 et de ce fait 1e mecanisme d'entrainement du film. On the other hand, for the 1st blocking, when the 1st slider 7 driven by a finger not represented6 approaches the lever 17, its extension 23, by coming into contact with the 1st inclined plane 22 causes a displacement of the lever 17 Jans 1e direction of the flkhe 24 (fig. 4), which has the effect of bringing the first edge of the plate 19 against the trajeetoire of the eccentric 16. The pinion 5 of the slider 7 is adjusted in such a way that when the first lever 17 at Bubi its maximum displacement, the shutter is fully closed. In this Position of the lever 17 (Position drawing ä, fig. 4), the plate 19 is adjusted so that its edge bites slightly into the trajectory of the eccentric 16. When the eccentric 16 passes opposite of the plate 19, a wedging occurs between these two parts, which has the effect of stopping the first pinion 4 and therefore the first film drive mechanism.

De preference, 1e tout est regle de faeon que 1e blocage du mecanisme se fasse alors que la griffe d'entrainement du film est retirk. Preferably, everything is adjusted so that the blocking of the mechanism takes place while the film drive claw is withdrawn.

Pour la mise en marche, il suffit de d'e- placer 1e baIadeur 7 par 1e doigt de com- mande pour degager 1e plan incline 22 du levier 17 qui est alors ramene par 1e ressort 21 contre RTI ID="0003.0273" WI="6" HE="4" LX="1254" LY="720"> une goupille 25 fixee au Support 10. Dans ce mouvement, la plaquette 19 s'eloigne de Fexcentrique 16 et permet ä eelui-ei de reprendre sa course. To start it, it suffices to place the slider 7 with the control finger to disengage the inclined plane 22 from the lever 17 which is then brought back by the spring 21 against RTI ID="0003.0273" WI= "6" HE="4" LX="1254" LY="720"> a pin 25 fixed to the Support 10. In this movement, the plate 19 moves away from the eccentric 16 and allows it to resume its travel .

Les fig. 5 ä 7 du dessin montrent partiel- lement un appareil de Prise de vues cinema- tographiques muni d'un obturateur variable de construction connue et dun dispositif per- mettant d'arreter 1e mkanisme d'entraine- ment du film en fin de fermeture de 1'obtu- rateur et. de 1e mettre en marche au debut de Fouverture de Pobturateur independamment du levier de declenchement de l'appareil. Figs. 5 to 7 of the drawing partially show a cinematographic camera provided with a variable shutter of known construction and with a device making it possible to stop the drive mechanism of the film at the end of closing of the film. the shutter and. to start it at the beginning of the opening of the shutter independently of the release lever of the device.

L'obturateur, forme de deux Aales 1 et 2, est actionn4 depuis Farbre 30 par les pignons 31 et 32. L'arbre 30 Porte un disque 33 Sur lequel agissent les organes de blocage du me- canisme d'entrainement du film. The shutter, in the form of two Aales 1 and 2, is actuated from the shaft 30 by the pinions 31 and 32. The shaft 30 carries a disc 33 on which the locking members of the film drive mechanism act.

La Aale 1 est fixe par rapport au pignon 32, tandis que la Aale 2 est mobile par rap- port ä la Aale 1. D'autre Part, les deux Aales sont liees entre elles par un mecanisme 34 non dessine et qui transmet 1e mouvement dune päle ä 1'autre avec un rapport de trans- mission de un. The Aale 1 is fixed with respect to the pinion 32, while the Aale 2 is mobile with respect to the Aale 1. On the other hand, the two Aales are linked together by a mechanism 34 not drawn and which transmits the movement from one pole to the other with a transmission ratio of one.

En agissant par 1e levier 35 Sur 1e meca- nisme 34, de construction eonnue, an provo- que un mouvement relatif de 1a. Aale 2 par rapport ä la Aale 1, que les Aales soient en rotation ou ä 1'arret. La Position dessinee du levier 35 correspond ä la pleine ouverture de Fobturateur, tandis que la fleehe 36 indique 1e mouvement ä donner au levier 35 pour fermer Fobturateur. By acting by the lever 35 on the mechanism 34, of known construction, an causes a relative movement of 1a. Aale 2 relative to Aale 1, whether the Aales are rotating or stationary. The drawn position of the lever 35 corresponds to the full opening of the shutter, while the arrow 36 indicates the movement to be given to the lever 35 to close the shutter.

Le levier 35, coulissant Sur la vis 37 et Faxe 38, est actionne par Fintermediaire du cavalier 39 fixd par les vis 40 sur lui, par la came 41 solidaire du bouton de manoeuv re ou manette 42 et tournant sur Faxe 38. La ma- nette 42 Porte un disque 44 inuni d'un repere se d6placant devant un tableau indicatif (non dessin6) de Pouverture de Fohturateur. The lever 35, sliding on the screw 37 and faxe 38, is actuated by the intermediary of the rider 39 fixed by the screws 40 on it, by the cam 41 integral with the operating button or handle 42 and rotating on the faxe 38. The ma- net 42 Carries a disc 44 without a marker moving in front of an indicative table (not drawn) of the opening of the shutter.

Le levier 35 Porte un ergot 45 qui com- mande 1e dispositif de blocage articuls sur faxe 46. Ce dispositif de blocage se compose d'un slement 47 formant levier, prssentant deux faces 48 et 49, consti- tuant un bord en forme de caine, s'appuyant contre Fergot 45 et un crochet 50 recevant Fattache d'un ressort de rappel 51, accroehs d'autre Part ä un ergot 52. Ce levier 47 est solidaire dun moyeu 53, sur lequel les vis 54 fixem 1e sabot de frein 55, dont la face 56 en are de spirale logarithmique peut eire amen6e en contact av ec la Peripherie du dis- que 33 et ainsi provoquer Parret du meca- nisme d'entrainement du film par coincement entre 1e disque 33 et 1e sabot de (rein 55. Lever 35 carries a pin 45 which controls the locking device articulated on fax 46. This locking device consists of a element 47 forming a lever, presenting two faces 48 and 49, , resting against Fergot 45 and a hook 50 receiving the attachment of a return spring 51, hooked on the other hand to a lug 52. This lever 47 is integral with a hub 53, on which the screws 54 fix the first brake shoe 55, whose face 56 in the form of a logarithmic spiral can be brought into contact with the periphery of the disc 33 and thus cause the film drive mechanism to stop by wedging between the disc 33 and the shoe of (kidney). 55.

Le fonctionnement de ce meeanisme est 1e suivant: Supposons que 1e inecanisme d'entraine- ment du film soit en mouvement, Parbre 30 tourne alors dans 1e sens indiqud par la fle- che 57. Les organes de commande du meca- nisme 34 et du dispositif de blocage sont dans la Position dessin6e. L'operateur desirant alors faire un fondu de fermeture tourne la manette 42 de telle faeon que la Partie 58 de la came 41 pousse 1e bec 59 du cavalier 39, lequel entraine 1e levier 35 qui agit alors sur 1e mscanisme 34. Cehii-ci Fait varier la Posi tion de la Aale 2 par rapport ä la Aale 1, augmentant de plus en plus Fangle d'obtura- tion. L'ergot 45, Porte par 1e levier 35, glisse 1e long de la face 49 du levier 47, lequel est appuyd contre cehii-lä par 1e ressort 51. La face 49 etant orientee dans la direction du mouvement de Fergot 45, 1e levier 47 ne bonge Aas tant que cehii-ci glisse 1e long de celle-1ä. Au moment oü Fangle d'obturation des Aales atteint 360 , Fergot 45 passe de la face 49 ä la face 48 qui forme un angle avec la direc- tion de celle-1ä. Le levier 47 pousse par 1e ressort 51 tourne dann 1e sens indiqus par la fleche 60, entrainant 1e sabot de frein 55 dont la face 56 vient appuyer contre la p6ripherie du disque 33. Par Feffet de la courbure de la face 56 et de la rotation du disque 33, des que 1e contaet est etabli entre ces deux pieces, 1e disque 33 est arret6, et avee lui 1e meca- nisme d'entrainement du film, par Feffet de coin du (rein 55. The operation of this mechanism is as follows: Assuming that the film drive mechanism is in motion, the shaft 30 then rotates in the direction indicated by the arrow 57. The control members of the mechanism 34 and of the locking device are in the drawn position. The operator then wishing to fade out turns lever 42 so that Part 58 of cam 41 pushes first beak 59 of rider 39, which drives first lever 35 which then acts on first mechanism 34. This Done vary the position of Aale 2 relative to Aale 1, increasing the shutter angle more and more. Pin 45, carried by lever 35, slides along face 49 of lever 47, which is pressed thereagainst by spring 51. Face 49 being oriented in the direction of Fergot's movement 45, the first lever 47 does not jump Aas as long as this slides along this one. As the shutter angle of the Aales reaches 360, Fergot 45 passes from face 49 to face 48 which forms an angle with the direction of that face. The lever 47 pushed by the first spring 51 rotates in the first direction indicated by the arrow 60, causing the first brake shoe 55 whose face 56 presses against the periphery of the disc 33. By the effect of the curvature of the face 56 and the rotation of the disk 33, as soon as contact is established between these two parts, the disk 33 is stopped, and with it the film drive mechanism, by the wedge effect of the kidney 55.

Le fondu d'ouverture se Fait en tournant la manette 42 dans 1e sens qui Fait pousser 1e bee 61 du cavalier 39 par la Partie 62 de la RTI ID="0004.0274" WI="8" HE="4" LX="1128" LY="719"> eame 41. L'ergot 45 commenee par repousser 1e levier 47, 1e sabot de (rein 55 quitte 1e dis- que 33 qui se remet ä tourner. Au moment oü Pergot 45 passe de la face 48 ä la face 49 du levier 47, les Aales commencent ä s'ouv rir. The fade in is done by turning the handle 42 in the 1st direction which pushes the 1st bee 61 of the jumper 39 through the Part 62 of the RTI ID="0004.0274" WI="8" HE="4" LX="1128 " LY="719"> end 41. The lug 45 begins by pushing back the lever 47, the kidney shoe 55 leaves the disc 33 which starts to turn again. At the moment when Pergot 45 passes from the face 48 to face 49 of lever 47, the Aales begin to open.

Lorsque 1e meeanisme d'entrainement du film a 6t6 arrete par la fermeture de 1'obtu- rateur, comme decrit ei-dessus, il est possible de 1e faire tourner en arriere sans ouvrir les Aales; 1e disque 33 tournant alors dann 1e sens opposd ä eelui indique par la fleche 57 re- pousse contre Faction du ressort 51 1e sabot de frein 55 par simple frottement; la face 56 et la pdripherie du disque 33 ne se quittant Aas, des que cette rotation en arriere cesse et que la rotation en avant tendrait ä se r6ta- blir, 1e sabot de frein 55 bloque ä, nouveau 1e disque 33. When the film drive mechanism has been stopped by closing the shutter, as described above, it can be rotated back without opening the shutters; the disc 33 then rotating in the direction opposite to that indicated by the arrow 57 pushes against the action of the spring 51 the brake shoe 55 by simple friction; the face 56 and the periphery of the disc 33 never leaving each other, as soon as this backward rotation ceases and the forward rotation tends to be restored, the brake shoe 55 again blocks the disc 33.

Pour que tous ces diff6rents organes tra- v aillent dune facon bien sy nchronisee, trois reglages sont prevus: par desserrage des vis 54, 1e sabot de (rein 55 peut etre mis dans une Position correcte par rapport au levier 47. La face 56 est assez longue pour qu'une variation de la distance entre les axes 30 et. 46 puisse etre rattrapee par une inelinaison plus ou moins grande du sabot de frein 55 par rapport au levier 47; par desserrage des vis 40, 1e levier 35 peut 6tre deplace par rapport au cavalier 39 pour permettre ä Pergot 45 de trau ailler dans une Position correete par rapport aux faces 48 et 49 du levier 47; des moyens sont, en outr e, prevus dans l.e mecanisme 34 pour permettre de rdgler la Position de la Aale 2 par rapport ä la Aale 1. En variante de la derniere forme d'exe- cution decrite ei-dessus, 1e disque 33 au lieu d'etre fixe eoncentriquement ä 1'arbre mo- teur 30, comme cela est represente ä la fig. 5, pourrait etre fixe excentriquement Sur Far bre 30. Ainsi, 1e blocage du niecanisme d'en- trainement du film s'effectuerait toujours dans une meme Position determinee au mo- ment oü la Partie la plus excentree du dis- que 33 viendrait buter eontr e 1e sabot de frein 55. For all these different organs to work in a well synchronized way, three adjustments are provided: by loosening the screws 54, the kidney shoe 55 can be put in a correct position with respect to the lever 47. The face 56 is long enough so that a variation in the distance between the pins 30 and 46 can be compensated for by a greater or lesser inclination of the brake shoe 55 with respect to the lever 47; by loosening the screws 40, the lever 35 can be moved relative to the rider 39 to allow Pergot 45 to work in a corresponding position relative to the faces 48 and 49 of the lever 47; means are, moreover, provided in the mechanism 34 to allow the position of the Aale to be adjusted 2 with respect to Aale 1. As a variant of the last embodiment described above, the disc 33 instead of being fixed eoncentrically to the motor shaft 30, as shown in FIG. 5, could be fixed eccentrically on the shaft 30. Thus, the blocking of the drive mechanism of the film would always take place in the same determined position at the moment when the most eccentric part of the disc 33 would come abut against the 1st brake shoe 55.

Comme dans la forme d'exeeution repre- sent6e aux fig. 2 ä 4, il serait aussi possible Jans cette variante d'execution, en disposant Jans une Position determink 1e disque 33 Sur Farbre 30, de provoquer 1e blocage du me- canisme d'entrainement du film alors que la griffe d'entrainement est degagee du film. As in the embodiment shown in FIGS. 2 to 4, it would also be possible in this variant of execution, by arranging in a determined position the disc 33 on the shaft 30, to cause the blocking of the film drive mechanism while the drive claw is disengaged. of the movie.

La manipulation combinee des differents dispositifs dkrits de eommande de Fobtura- teur variable et du levier de declenchement et de blocage ordinaire du meeanisme d'en- trainement du film permet tous les eas de fondus desires depart en fondu ouvert apr & s un arret sann fondu, depart sann fondu aprA un arret avee fondu ferme, depart en fondu ouvert apres un arret avec fondu ferme, depart sans fondu apres un arret sans fondu, depart en fondu ouvert en suritnpression d'un fondu ferme. The combined manipulation of the various described variable shutter control devices and the ordinary tripping and blocking lever of the film drive mechanism allows all the desired fade-outs starting in fade-in after a fade-out stop. , start without fading after a stop with a hard fade, start with an open fade after a stop with a hard fade, start without a fade after a stop without a fade, start with a fade-in overpressure of a hard fade.

Claims

CLAIM: Camera for cinematographic shots, comprising a device for triggering and blocking its mechanism for driving the film provided with a maneuvering member and a variable shutter controlled by a control member , characterized in that it comprises a second device for engaging and blocking its drive mechanism, independent of the first, this second device for engaging and blocking being actuated by the control member of the variable shutter , the blocking position of this second device corresponding to the closed shutter position of said control member. SUB-CLAIMS 1. Apparatus according to claim, wherein the variable shutter comprises two co-rotating axles whose relative angular position is adjustable, the shutter adjustment mechanism comprising two coaxial gears with he- lic6idale inversk Fune relative to each other, each of the pinions being integral with Fune of the Aales and meshing with a wheel ä, corresponding toothing, the two toothed wheels forming part of a slider capable of being moved with the aid of the control organ - commands the first along an axis parallel to the axis of the pinions, so as to vary the relative angular position of these, characterized in that Faxe carrying RTI ID="0005.0271" WI="3" HE=" 4" LX="1412" LY="1091"> the first slider is secured to a Support, the first second release and locking device comprising means provided for blocking the helical gears when the first slider reaches the end of its travel at Following a displacement in a determined direction causing the closure of the fob turator.

2. Apparatus according to claim and sub-claim 1, characterized in that said means comprise a pike, made of material with a high coefficient of friction, through which the player is intended to rest. against the 1st Support at the end of its travel in the direction causing the closure of the shutter, the resulting friction of Fentrk in contact with the player with said pike causing Farret to cause the player to rotate and therefore of the pinions.

3. Apparatus according to claim and sub-claim 1, characterized in that said means comprise an eccentric part integral with one of the sprockets and a blocking pin capable of cooperating with said eccentric part to block said pins. - gnons, a spring having a tendency to maintain the blocking pike in the inactive position, a part of the slider causing, when the latter reaches the end of travel in the closing direction of the shutter, a placement of said pike which then comes into contact with the eccentric part and blocks said sprockets.

4. Apparatus according to claim 1a and sub-claims 1 and 3, characterized in that an inclined plane is provided to cause said pike to move.

5. Apparatus according to claim and sub-claims 1, 3 and 4, characterized in that said pike is a pivoted lever -on the first support, the part of said lever intended to cooperate with said eccentric part kant formed by an attached plate of adjustable way on.the lever.

6. Apparatus according to claim and sub-claim 1, characterized in that the two toothed wheels directing the slider are capable of being moved angularly relative to each other.

7. Apparatus according to claim, in which the variable shutter comprises two Aales rotating along the same axis and whose relative angular position is adjustable, the two Aales being driven from a motor shaft, characterized in that the second device triggering and blocking device comprises a disc carried by said motor shaft, disc against which is likely to come to jam a shoe of (kidney, intended to be actuated from the control member of the shutter, the first wedging taking place at the end of closure of the shutter B. Apparatus according to claim and sub-claim 7, characterized in that the control member comprises an operating button actuating by means of a cam a lever acting on the first mechanism for adjusting the shutter, this lever carrying a lug cooperating with an element integral with the shoe of the kidney, this one kaut mounted pivoting on inne Fixed part of the device, a spring tending to. Train in the direction of the disc. 9. Apparatus according to claim and sub-claims 7 and 8, characterized in that the first edge of said element acts . in the manner of a blade, a portion thereof being formed in such a way as to allow the brake shoe to pivot in the direction of the blocking, under the action of its spring, when the shutter reaches the end of closure. 10. Apparatus according to claim and sub-claims 7 to 9, characterized in that the part of the kidney hoof intended to come into contact with the first disc is in the form of a logarithmic spiral. 11. Apparatus according to claim and sub-claims 7 to 10, </B> characterized in that the brake shoe and the element forming the cam are secured to one another by screws allowing their relative angular position to vary. 13. Apparatus according to claim and subclaims 7 to 11, characterized in that the disc is fixed coneentrically to the motor shaft. the disc is fixed exentrically on the motor shaft so that the blocking of the film drive mechanism always takes place in the vicinity of a pre-determined position. and 13, in which the film drive mechanism comprises a claw, characterized in that the disk is arranged in such a way eccentrically on the motor shaft that the blocking of the film drive mechanism takes place always while the claw of entraineinent is released from the film.