CH476537A

CH476537A - Device for making a helical clock spring from a profiled strip

Info

Publication number: CH476537A
Application number: CH641266A
Authority: CH
Inventors: Ulrich Pierre
Original assignee: Nationale De Ressorts S A Fab
Priority date: 1966-05-03
Filing date: 1966-05-03
Publication date: 1969-09-30

Description

Dispositif pour confectionner un ressort helicoidal d'horlogerie, ä partir dune Bande profilee Ort connait de nombreux agencements gräce auxquels certaines machirres parviennent ä rouler une Bande profilde. Ces agencements sont mis en action pour 1'enrou- lement de certains ressorts helicdidaux ou, par exemple de ressorts d'horlogerie, pieces qui, avant leur utilisation, doivent etre formees ä partir dune teile Bande profilee. 0n connait par exemple des machirres comportant un mandrin cylindrique, entraine en rotation, autour duquel une Bande de section carree est enroulee, et deux organes egalement entrain6s en rotation pour 1'entrainement et 1e guidage de la lyande par un galet oblique pourvu dune Borge en V Jans laquelle s'engage 1'arete de la Bande. Device for making a helical clock spring from a profiled strip Ort knows many arrangements thanks to which certain jaws manage to roll a profiled strip. These arrangements are put into action for the winding of certain coil springs or, for example, clockwork springs, parts which, before their use, must be formed from such a profiled strip. We know, for example, jaws comprising a cylindrical mandrel, driven in rotation, around which a strip of square section is wound, and two organs also entrain6s in rotation for the drive and the first guide of the lyande by an oblique roller provided with a Borge in V Jans which engages the edge of the Band.

Aucune difficulte serieuse West rencontree pour la mise en action de ces agencements tant que la section de la Bande ä rouler (circulaire, rectangulaire etc.) Wop- pose pas une resistance trop importante au eintrage. Tel est le cas dune Bande ä section rectangulaire que 1'on roule autour d'un mandrin, sur sa plus Brande dimen- sion. No serious difficulty is encountered in putting these arrangements into action as long as the section of the tape to be rolled (circular, rectangular, etc.) does not pose too great a resistance to kinking. Such is the case of a band with a rectangular section which is rolled around a mandrel, over its widest dimension.

0n rencontre au contraire de Brandes difficultes des que Fon entreprend de rouler une Bande de section rec- tangulaire sur sa tranche. On the contrary, we encounter brandes difficulties as soon as Fon undertakes to roll a Strip of rectangular section on its edge.

Cela provient des d6formations importantes que Fon doit faire subir ä la Bande et qui se traduisent par une 6longation de la partie de celle-ci situee au-delä dune nervure moyenne et par une compression de la partie de la Bande situee en de#a de cette nervure moyenne. This is due to the significant deformations that the Strip must undergo and which result in an elongation of the part of the latter located beyond a middle rib and in a compression of the part of the Strip located below the this midrib.

Ces difficultds se rencontrent tout specialement lors- que Fon entreprend la fabrication de ressorts helicoidaux ä partir dune teile Bande, enrou1ee sur sa tranche, res- sorts dorrt Ia capacit6 d'emmagasinage d'energie est tres importante. These difficulties are encountered especially when the manufacture of helical springs is undertaken from such a strip, wound on its edge, since the springs have a very high energy storage capacity.

0n est donc amen6 ä imaginer des dispositifs specia- lement adapt6s pour rouler de teile Bande sur leur tran- che. We are therefore led to imagine devices specially adapted for rolling such strips on their edges.

La prAente Invention a precis6ment pour objet un dispositif pour confectionner un ressort helicoidal d'hor- logerie, ä partir dune Bande profilee, caracteris6 par 1e Fait qu'il comprend un mandrin cylindrique entmin6 en rotation et autour dune port6e duquel s'enroule ladite Bande et d'au moins deux organes, chacun de ces organes comprenant un bras radial de positionnement se termi- nant par une embase dann laquelle tourillonne un arbre parallele au mandrin et entrain6 en rotation et dorrt I'extremit6 porte un galet entrainant, par friction et gui- dant la Bande sur 1e mandrin cylindrique, 1e galet pre- sentant un 6paulement maintenant axialement et ferme- ment la Bande appliquee contre 1e corps du mandrin, des moyens e1astiques puissants assurant ce maintien axial, I'entrainement du mandrin cylindrique et des galets assu- rant ä ceux-ei des vitesses circonferentielles egales et les spires dejä formfies etant evacu6es, ä 1'extremite du mandrin. par ledit epaulement. The subject of the present invention is precisely a device for making a helical clock spring, from a profiled strip, characterized by the fact that it comprises a cylindrical mandrel started to rotate and around a bearing surface of which the said strip is wound. and at least two members, each of these members comprising a radial positioning arm terminating in a base in which a shaft parallel to the mandrel rotates and is driven in rotation and the end of which carries a driving roller, by friction and guiding the Strip on the cylindrical mandrel, the roller having a shoulder maintaining axially and firmly the Strip applied against the body of the mandrel, powerful elastic means ensuring this axial holding, driving the cylindrical mandrel and the rollers providing them with equal circumferential speeds and the turns already formed being evacuated, at the end of the mandrel. by said shoulder.

La presente Invention Sera mieux comprise en se referant au dessin annexe qui represente, ä titre d'exem- ple, une forme d'execution de celle-ei et dans lequel La fig. 1 est une coupe axiale du dispositif ; la fig. 2 est un detail agrandi de la fig. 1 ; la fig. 3 est une coupe diametrale du dispositif selon 111-11I de la fig. 1, et la fig. 4 une vue de face du dispositif. The present invention will be better understood by referring to the appended drawing which represents, by way of example, one form of execution thereof and in which FIG. 1 is an axial section of the device; fig. 2 is an enlarged detail of FIG. 1; fig. 3 is a diametral section of the device according to 111-11I of FIG. 1, and fig. 4 a front view of the device.

En se referant tout d'abord ä la fig. 1, 1e mandrin cylindrique 1 presente une portee 2 sur Iaquelle est rou- lee la Bande 3. Referring first to FIG. 1, the cylindrical mandrel 1 has a surface 2 on which the strip 3 is rolled.

Les organes d'entrainement et de guidage 4 et 5 de cette Bande comprennent chacun un bras radial 6 qui determine la position angulaire de 1'organe. The drive and guide members 4 and 5 of this strip each comprise a radial arm 6 which determines the angular position of the member.

Chacun de ces organes comporte un arbre rotatif 7 parallele au mandrin 1 et tourillonnant dans 1'embase du bras 6 ä 1'int6rieur d'un palier 8 et par 1'intermediaire de bagues diam6trales 9 et 10, par exemple ä roulement ä billes. L'une des extr6mites de 1'arbre 7 comporte une douille 11 d'entminement de celui-ei dans laquelle est Each of these members comprises a rotating shaft 7 parallel to the mandrel 1 and pivoting in the base of the arm 6 inside a bearing 8 and via diametrical rings 9 and 10, for example with ball bearings. One of the ends of the shaft 7 comprises a socket 11 for ending it in which is

chassee ä force, 1'extremite d'un cäble de commande 12. Lautre extr6mit6 de Farbre Porte un galet 13 entrdnant a friction Ja Bande ä rouler 3 laquelle s'enroule pro- gressivement sur la portie 2 du mandrin 1. Un 6paule- ment circulaire 14 du galet 13, d6bordant de celui-ci, maintient fermement en permanence la spire en cours de eintrage contre Je corps 1 du mandrin. Des moyens elas- tiques puissants sont prevus qui assurent ce maintien. Ces moyens sont r6alises, ä la fig. 1, par un fort ressort 15 prenant appui dune Part sur la p6riph6rie de la Base de la douille 11. et. d'autre pari, sur la periph6rie de la bague 9. Les spires d6jä formfies 26 sont dvacu6es sur la portee 2, ä l'ext6rieur de 1'6paulement 14 des galets. L.e mandrin cylindrique 6tant lui-meme entraine en rotation par des moyens non represent6s en liaison avec les moyens d'entrainement des galets 13, de maniere ä assurer au mandrin cylindrique et aux galets, une vitesse circonf6rentielle Egale. forced out, the end of a control cable 12. The other end of the shaft carries a roller 13 driving the rolling strip 3 by friction, which is rolled up progressively on the port 2 of the mandrel 1. A shoulder circular 14 of the roller 13, overflowing from it, permanently firmly holds the turn being eintrage against I body 1 of the chuck. Powerful elastic means are provided which ensure this maintenance. These means are embodied in FIG. 1, by a strong spring 15 resting on the one hand on the periphery of the base of the sleeve 11. and. on the other hand, on the periphery of the ring 9. The turns 26 already formed are discharged on the span 2, outside the shoulder 14 of the rollers. The cylindrical mandrel 6 being itself driven in rotation by means not represented in conjunction with the means for driving the rollers 13, so as to ensure that the cylindrical mandrel and the rollers have an equal circumferential speed.

Ainsi que cela est repr & ente ä la fig. 3. la Bande 3 qui peut se presenter, au d6part enrou16e selon sa plus Brande largeur, dans un container non repr6sent6. est Prise en charge par ]es galets 13 et 1e mandrin 2. As shown in FIG. 3. Band 3 which may be presented, initially rolled up according to its widest width, in a container not shown. is supported by] the rollers 13 and the first mandrel 2.

Le pr6sent dispositif en enroulant la Bande exerce deux actions complementaires 11 assure tout d'abord la mise en forme circulaire de la Bande et Fenroulement de celle-ei sur sa tranche nrace aux galets 13 des Organes 4 et 5 et qui doivent eire s6pares l'un de 1'autre d'un angle d6termin6 pour que la courbure de la Bande s'effectue normalement. Cet angle est fonction du diametre des galets, de celui du mandrin, des dimensions du Profil rou16 et de la matiere constituant la Bande. The present device, by rolling up the Band, exerts two complementary actions 11 first of all ensures the circular shaping of the Band and the winding of the latter on its edge nrace to the rollers 13 of the Organs 4 and 5 and which must be separated from the one another at a determined angle so that the curvature of the Band takes place normally. This angle is a function of the diameter of the rollers, that of the mandrel, the dimensions of the Rou16 Profile and the material constituting the Strip.

Il assure d'autre Part 1e guidage axial rigoureux de la Bande qui est effectu6 gräce ä la forte Pression qu'exerce axialement 1'6paulement circulaire 14 des galets contre celle-ei en la comprimant rigoureusement contre les spires dejä enrou16es. Cette action a pour r6sultat d'eviter toutes d6formations laterales telles qu'un -auchissement de la Bande au moment de sa cOurbure. On the other hand, it ensures rigorous axial guidance of the strip which is effected by virtue of the strong pressure exerted axially by the circular shoulder 14 of the rollers against the latter by compressing it rigorously against the turns already wound. This action has the result of avoiding any lateral deformations such as a -auchissement of the Band at the time of its curvature.

Ort peut ainsi realiser des ressorts ä boudins ä spires plates selon divers diametres en choisissant convenable- ment 1e mandrin 1. Ort can thus produce coil springs with flat coils according to various diameters by suitably choosing the mandrel 1.

Ort peut en outre augmenter 1e nombre des Organes .4. si la rigidite du metal utilis6 pour la confection de la hande 1'exige, afin d'obtenir une courbure parfaitement reguliere des spires. Ort can also increase the number of Organs .4. if the rigidity of the metal used to make the hand requires it, in order to obtain a perfectly regular curvature of the turns.

Il est en particulier ä noter ainsi que cela ressort de la fig. 2, que chaque galet 13 n'exerce pas directement son action sur 1e mandrin 1 mais sur la Bande elle-meme 3 qui est entrainee en frietion par ce galet dune Part et par Je mandrin d'autre Part. A cet effet, des interstices 31 et 32 sont m6nag6s respectivement entre chaque galet 13 et 1e corps du mandrin 1, dune pari et entre son dpaulement 14 et la port6e 2 de ce mandrin d'autre pari. It should be noted in particular that it is apparent from FIG. 2, that each roller 13 does not exert its action directly on the first chuck 1 but on the strip itself 3 which is driven in friction by this roller on the one hand and by the chuck on the other hand. To this end, interstices 31 and 32 are m6nag6s respectively between each roller 13 and the first body of the mandrel 1, dune bet and between its shoulder 14 and the port6e 2 of this mandrel of another bet.

En se ref6rant maintenant ä la fig. 4, chaque Organe 4. et 5 est port6 par un secteur 25, coulissant sur une coulisse circulaire 16, portee par une couronne 17. Le bras 6 coulisse dans une creusure 18 de ce secteur et y est guid6 par une creusure int6rieure 19 coulissant autour d'un boulon 20 dont la tete, bloqu6e, maintient ainsi que la vis 21 le bras dans sa Position radiale. Referring now to FIG. 4, each Organ 4. and 5 is carried by a sector 25, sliding on a circular slide 16, carried by a crown 17. The arm 6 slides in a recess 18 of this sector and is guided there by an interior recess 19 sliding around a bolt 20 whose head, bloqu6e, maintains as well as the screw 21 the arm in its radial position.

0n peut ainsi modifier la distance angulaire de ces Organes en fonetion de la rigidit6 propre du m6tal utilis6. Le pr6sent dispositif peut etre mont6 sur une machine adequate. It is thus possible to modify the angular distance of these Organs according to the inherent rigidity of the metal used. This device can be mounted on a suitable machine.

Claims

CLAIM Device for making a helicoidal watch spring, from a profiled strip, characterized in that it comprises a cylindrical mandrel (1) driven in rotation and around a bearing surface of which the said strip is wound and at least at least two Organs, each of these Organs comprising a radial positioning arm (6) terminating in a base in which a shaft (7) is journalled parallel to the chuck and driven in rotation and the end of which carries a roller (13) driving, by friction and guiding the Band on the first cylindrical mandrel, the first roller having a shoulder (14) maintaining axially and firmly the Band applied against the first body of the mandrel, powerful elastic means ensuring this axial holding, 1 the drive of the cylindrical mandrel and the rollers providing them with equal circumferential speeds and the turns already formed being evacuated. at the end of the chuck. by said shoulder. SUB-CLAIMS 1. Device according to claim. caraet6rise by the first fact that said strip drive and guide members are at least two in number.

2. Device according to claim, characterized by the fact that said shaft (7) is driven in rotation by a cable (12) driven by force in a sleeve (11) secured to this shaft. Opposite writings and images pending German patent N 1125388 US patents N- 2398172, 2495212