CH628457A5

CH628457A5 - Record turntable playing device

Info

Publication number: CH628457A5
Application number: CH215379A
Authority: CH
Inventors: Daniel Bois; Jan Olsfors
Original assignee: Daniel Bois; Jan Olsfors; Pfau Jean
Priority date: 1979-03-06
Filing date: 1979-03-06
Publication date: 1982-02-26

Abstract

The arm of a record playing device consists of two separable parts (1 and 2). The part (1) carries a playing head (10) and a counterweight (15) and has notches (28, 31, 32) enabling it to be fastened to the part (2) by engaging with corresponding pieces (27, 29, 30). The part (2) carries a pivot (20) which is hinged to a support (22). The part (2) further has, under the body (19), contact blades intended to cooperate with contacts (13) of the part (1) which are connected to the electrical terminals of the playing head. Through the separability into two parts, this device facilitates the replacement of one record playing head by another. <IMAGE>

Description

**ATTENTION** debut du champ DESC peut contenir fin de CLMS **. ** ATTENTION ** start of the DESC field may contain end of CLMS **.

REVENDICATIONS 1. Dispositif de lecture pour tourne-disque, dans lequel la tête de lecture est portée par un bras articulé sur un chariot se déplaçant de long d'un guide rectiligne disposé parallèlement à une trajectoire radiale de lecture, ce bras présentant une longueur de moins de 15 cm et étant muni d'un contrepoids, caractérisé en ce que ledit bras est constitué en deux parties séparables l'une de l'autre, l'une de ces parties portant les moyens d'articulation au chariot, l'autre partie portant la tête de lecture et le contrepoids, des moyens de fixation permettant de rendre les deux parties solidaires l'une de l'autre dans une position relative précise, des contacts électriques étant prévus entre les deux parties pour relier la tête de lecture à un amplificateur. CLAIMS 1. Reading device for a record player, in which the reading head is carried by an arm articulated on a carriage moving along a straight guide disposed parallel to a radial reading trajectory, this arm having a length of less of 15 cm and being provided with a counterweight, characterized in that said arm is made up of two parts separable from one another, one of these parts carrying the means of articulation to the carriage, the other part carrying the read head and the counterweight, fixing means making it possible to make the two parts integral with one another in a precise relative position, electrical contacts being provided between the two parts to connect the read head to a amplifier.

2. Dispositif selon la revendication 1, caracetérisé en ce que les moyens de fixation comprennent des parties de guidage et de butée et au moins un élément formant cran élastique de retenue des deux parties l'une contre l'autre. 2. Device according to claim 1, characterized in that the fixing means comprise guide and stop parts and at least one element forming an elastic catch retaining the two parts against each other.

3. Dispositif selon la revendication 1, caractérisé en ce que la partie portant la tête de lecture et le contrepoids portent des repères définissant un axe horizontal de l'articulation lorsque les deux parties sont solidaires l'une de l'autre, ces repères permettant d'effectuer un réglage du contrepoids lorsque la partie qui le porte est détachée de l'autre. 3. Device according to claim 1, characterized in that the part carrying the read head and the counterweight carry marks defining a horizontal axis of the joint when the two parts are integral with each other, these marks allowing adjust the counterweight when the part carrying it is detached from the other.

4. Dispositif selon la revendication 2, caracetérisé en ce que la partie portant la tête de lecture est en forme de cadre, ce cadre présentant deux flancs déformables élastiquement, ces flancs portant des moyens de retenue coopérant avec des moyens de retenue correspondants prévus sur l'autre partie, ladite déformation élastique étant destinée à dégager ces moyens de retenue. 4. Device according to claim 2, characterized in that the part carrying the read head is in the form of a frame, this frame having two elastically deformable sides, these sides carrying retaining means cooperating with corresponding retaining means provided on the 'other part, said elastic deformation being intended to release these retaining means.

On connaît déjà des dispositifs de lecture pour tourne-disque, dans lesquels la tête de lecture est portée par un bras articulé sur un chariot se déplaçant de long d'un guide rectiligne disposé parallèlement à une trajectoire radiale de lecture, ce bras présentant une longueur de moins de 15 cm et étant muni d'un contrepoids. Reading devices for a record player are already known, in which the reading head is carried by an arm articulated on a carriage moving along a rectilinear guide arranged parallel to a radial reading trajectory, this arm having a length less than 15 cm and having a counterweight.

Les dispositifs de ce genre sont avantageux, car la tête de lecture conserve toujours une orientation bien déterminée par rapport au sillon du disque, du début à la fin de la reproduction du disque, et en outre cette construction permet de placer le point d'articulation du bras à proximité immédiate de la face supérieure du disque, ce qui supprime pratiquement tout effet de pleurage dû à des défauts de planéité du disque. Devices of this kind are advantageous, since the read head always retains a well-defined orientation relative to the groove of the disc, from the start to the end of the reproduction of the disc, and furthermore this construction makes it possible to place the point of articulation. of the arm in the immediate vicinity of the upper face of the disc, which eliminates practically any weeping effect due to defects in the flatness of the disc.

Dans ces dispositifs, il est toutefois malaisé de changer de tête de lecture, ce qui est un inconvénient pour les amateurs exigeants, car ceux-ci disposent en général de plusieurs têtes de lecture pour pouvoir utiliser celle qui est la mieux adaptée à l'enregistrement à reproduire. In these devices, it is however difficult to change the read head, which is a drawback for demanding amateurs, because they generally have several read heads to be able to use the one which is best suited to the recording to be reproduced.

La présente invention a pour but de faciliter dans une grand mesure le remplacement d'une tête de lecture par une autre, ceci grâce au fait que le bras est constitué en deux parties sépa rables rune de l'autre, l'une de ces parties portant les moyens d'articulation au chariot, l'autre partie portant la tête de lecture et le contrepoids, des moyens de fixation permettant de rendre les deux parties solidaires l'une de l'autre dans une position relative précise, des contracts électriques étant prévus entre les deux parties pour relier la tête de lecture à un amplificateur. The object of the present invention is to facilitate to a large extent the replacement of one read head by another, this thanks to the fact that the arm is made up of two separate parts. rables rune on the other, one of these parties carrying the means of articulation to the carriage, the other part carrying the read head and the counterweight, fixing means making it possible to make the two parts integral with each other in a precise relative position, electrical contracts being provided between the two parts to connect the read head to an amplifier.

Le dessin annexé représente, schématiquement et à titre d'exemple, une forme d'exécution du dispositif de lecture objet de l'invention. The attached drawing represents, schematically and as a example, an embodiment of the object reading device of the invention.

La fig. 1 est une vue en perspective montrant le bras dont les deux parties sont séparées. Fig. 1 is a perspective view showing the arm whose two parts are separated.

La fig. 2 montre ce même bras en coupe longitudinale. Fig. 2 shows this same arm in longitudinal section.

La fig. 3 en est une coupe transversale selon 111-111 de la fig.2. Fig. 3 is a cross section along 111-111 of FIG. 2.

Les fig. 4 et 5 montrent en plan chacune des deux parties du bras. Figs. 4 and 5 show in plan each of the two parts of the arms.

Comme le montre bien la fig. 1, le bras comprend deux parties 1 et 2. La partie 1 est constituée par une pièce en forme de cadre présentant deux flancs latéraux 3 et 4 réunis par plusieurs branches transversales 5, 6, 7 et 8. La branche transversale 6 présente deux alésages filetés 9 permettant la fixation par vis d'une tête de lecture 10. As shown in fig. 1, the arm comprises two parts 1 and 2. Part 1 is constituted by a part in the form of a frame having two lateral flanks 3 and 4 joined by several transverse branches 5, 6, 7 and 8. The transverse branch 6 has two bores threaded 9 allowing the fixing by a reading head 10.

La branche 6 porte un prolongement Il constituant un support pour une plaquette isolante 12 munie de contacts 13 reliés par des fils, non représentés, aux bornes de la tête de lecture 10. The branch 6 carries an extension II constituting a support for an insulating plate 12 provided with contacts 13 connected by wires, not shown, at the terminals of the read head 10.

Les deux branches 7 et 8 présentent un trou pour le passage d'une vis 14 commandant le déplacement longitudinal d'un contrepoids 15. Un ressort 16 exerce une force élastique sur le contrepoids 15 pour appliquer la tête de la vis 14 contre la branche 8 et rendre la position du contrepoids indépendante des eux de construction. The two branches 7 and 8 have a hole for the passage of a screw 14 controlling the longitudinal movement of a counterweight 15. A spring 16 exerts an elastic force on the counterweight 15 to apply the head of the screw 14 against the branch 8 and make the position of the counterweight independent of their construction.

Le bras doit être articulé sur un chariot dont une partie 17 est visible à la fig. 3. Ce chariot est destiné à coulisser le long d'un guide 18 pour accompagner le bras vers le centre du disque au cours de la reproduction. Les déplacements du chariot 17 le long du guide 18 peuvent être commandés ou obtenus de différentes façons, connues en elles-mêmes, qui ne font pas partie de l'invention et ne seront donc pas décrites en détails. The arm must be articulated on a carriage, a part 17 of which is visible in FIG. 3. This carriage is intended to slide along a guide 18 to accompany the arm towards the center of the disc during reproduction. The movements of the carriage 17 along the guide 18 can be controlled or obtained in different ways, known in themselves, which are not part of the invention and will therefore not be described in detail.

L'articulation du bras sur le chariot 17 est réalisée par la partie 2 supérieure. Cette partie comporte un corps 19 en matière plastique associé à un pivot 20. L'extrémité inférieure conique de ce pivot est engagée dans un palier conique 21 porté par un support 22 en forme générale de cadre triangulaire. L'extrémité supérieure du pivot 20 est engagée dans un espace 23 rectiligne ménagé entre les deux demi-branches supérieure 24 et 25 du support 22. The articulation of the arm on the carriage 17 is carried out by the upper part 2. This part comprises a body 19 made of plastic material associated with a pivot 20. The conical lower end of this pivot is engaged in a conical bearing 21 carried by a support 22 in the general shape of a triangular frame. The upper end of the pivot 20 is engaged in a rectilinear space 23 formed between the two upper half-branches 24 and 25 of the support 22.

Le corps 19 comprend des parties de guidage et de butée pour permettre de rendre les deux parties 1 et 2 solidaires l'une de l'autre dans une position relative précise. A cet effet, le corps 19 présente une branche transversale 26 dont les extrémités sont recourbées en 27 et qui est destinée à venir s'engager dans deux évidements 28 des flancs 3 et 4 de la partie 1. Les extrémités recourbées 27 viennent prendre appui contre les faces extérieures des flancs 3 et 4. The body 19 includes guide and stop parts to make the two parts 1 and 2 integral with one another in a precise relative position. To this end, the body 19 has a transverse branch 26, the ends of which are curved at 27 and which is intended to come into engagement in two recesses 28 in the sides 3 and 4 of the part 1. The curved ends 27 come to bear against the outer faces of the sides 3 and 4.

Le corps 9 présente encore deux crochets 29 et 30 destinés à s'engager dans deux ouvertures 31 et 32 des flancs 3 et 4. Ces flancs sont déformables élastiquement dans le sens transversal du bras et portent des saillies de préhension 33 et 34 destinées à être pressées l'une en direction de l'autre par l'usager pour déformer les flancs 3 et 4 de façon à les rapprocher l'un de l'autre pour faciliter les opération d'engagement et de dégagement entre les crochet 29 et 30 et les ouvertures 31 et 32. The body 9 also has two hooks 29 and 30 intended to engage in two openings 31 and 32 of the sides 3 and 4. These sides are elastically deformable in the transverse direction of the arm and carry gripping projections 33 and 34 intended to be pressed one towards the other by the user to deform the sides 3 and 4 so as to bring them closer to one another to facilitate the engagement and release operations between the hooks 29 and 30 and openings 31 and 32.

n est visible à la fig. 2 que le corps 19 porte en outre une plaquette 35 munie de lames élastiques de contact 36. Ces lames sont destinées à coopérer avec les contacts 13 de la plaquette 12 lorsque les parties 1 et 2 sont accouplées l'une à l'autre. n is visible in fig. 2 that the body 19 further carries a plate 35 provided with elastic contact blades 36. These blades are intended to cooperate with the contacts 13 of the plate 12 when the parts 1 and 2 are coupled to one another.

A la fig. 3, on a représenté en pointillé la position de la partie 1 lorsqu'elle est rendue solidaire de la partie 2. On voit que cette partie 1 présente un espace vide 37 permettant le passage du pivot 20 et du support 22. In fig. 3, the position of part 1 is shown in dotted lines when it is made integral with part 2. It can be seen that this part 1 has an empty space 37 allowing the pivot 20 and the support 22 to pass.

Grâce à la disposition décrite, le changement d'une tête de lecture peut être réalisé très facilement, puisqu'il suffit à l'usager de serrer les saillies 33 et 34 l'une contre l'autre pour dégager la partie inférieure 1 du bras et la séparer de l'appareil, les contacts électriques étant automatiquement déconnectés. La tête de lecture peut ensuite être enlevée très facilement pour être remplacée par une autre. Thanks to the arrangement described, the change of a read head can be carried out very easily, since it suffices for the user to tighten the projections 33 and 34 one against the other to release the lower part 1 of the arm and separate it from the appliance, the electrical contacts being automatically disconnected. The read head can then be removed very easily to be replaced by another.

Pour les amateurs exigeants, il est même possible d'acquérir autant de parties 1 qu'ils ont de têtes de lecture à disposition, ainsi chaque tête de lecture rest montée en permanence sur une partie 1 et l'échange peut être fait de façon pratiquement instantanée. Dans ce cas, le contrepoids 15 est réglé pour chaque partie 1 en fonction de la tête de lecture dont elle est équipée. For demanding amateurs, it is even possible to acquire as many parts 1 as they have read heads available, so each read head remains permanently mounted on part 1 and the exchange can be done practically instant. In this case, the counterweight 15 is adjusted for each part 1 as a function of the read head with which it is equipped.

Ce réglage est facilité grâce à deux encoches 38 ménagées dans This adjustment is facilitated by two notches 38 formed in

les flancs 3 et 4 et alignées sur un axe perpendiculaire au pivot 20, ainsi qu'à un plan longitudinal contenant ce pivot 20. the sides 3 and 4 and aligned on an axis perpendicular to the pivot 20, as well as to a longitudinal plane containing this pivot 20.

Bien entendu, on peut prévoir de nombreuses modifications et il est clair que les deux parties du bras peuvent être rendues solidaires l'une de l'autre par toute disposition connue, notamment par des mécanismes à cran, ou à bouton-pression, par des dispositifs utilisant une force d'attraction magnétique, ou par une fixation à vis, ou encore à couliesse. Of course, there can be many modifications and it is clear that the two parts of the arm can be made integral with each other by any known arrangement, in particular by notch or press-button mechanisms, by devices using a magnetic attraction force, or by a screw fixing, or even with sliding.

Claims

1. Reading device for record player, in which the reading head is carried by an arm articulated on a carriage moving along a straight guide arranged parallel to a radial reading trajectory, this arm having a length of less of 15 cm and being provided with a counterweight, characterized in that said arm is made up of two parts separable from one another, one of these parts carrying the means of articulation to the carriage, the other part carrying the read head and the counterweight, fixing means making it possible to make the two parts integral with one another in a precise relative position, electrical contacts being provided between the two parts to connect the read head to a amplifier.

2. Device according to claim 1, characterized in that the fixing means comprise guide and stop parts and at least one element forming an elastic catch retaining the two parts against each other.

3. Device according to claim 1, characterized in that the part carrying the read head and the counterweight carry marks defining a horizontal axis of the joint when the two parts are integral with each other, these marks allowing adjust the counterweight when the part carrying it is detached from the other.

4. Device according to claim 2, characterized in that the part carrying the read head is in the form of a frame, this frame having two elastically deformable sides, these sides carrying retaining means cooperating with corresponding retaining means provided on the 'other part, said elastic deformation being intended to release these retaining means.

Reading devices for a record player are already known, in which the reading head is carried by an arm articulated on a carriage moving along a rectilinear guide arranged parallel to a radial reading trajectory, this arm having a length less than 15 cm and having a counterweight.

Devices of this kind are advantageous, since the read head always retains a well-defined orientation relative to the groove of the disc, from the start to the end of the reproduction of the disc, and furthermore this construction makes it possible to place the point of articulation of the arm in the immediate vicinity of the upper face of the disc, which eliminates practically any weeping effect due to defects in the flatness of the disc.

In these devices, it is however difficult to change the read head, which is a drawback for demanding amateurs, because they generally have several read heads to be able to use the one which is best suited to the recording to be reproduced.

The present invention aims to facilitate to a great extent the replacement of a read head by another, this thanks to the fact that the arm is made up of two separate parts. rables rune on the other, one of these parties carrying the means of articulation to the carriage, the other part carrying the read head and the counterweight, fixing means making it possible to make the two parts integral with each other in a precise relative position, electrical contracts being provided between the two parts to connect the read head to an amplifier.

The attached drawing represents, schematically and as a example, an embodiment of the object reading device of the invention.

Fig. 1 is a perspective view showing the arm whose two parts are separated.

Fig. 2 shows this same arm in longitudinal section.

Fig. 3 is a cross section along 111-111 of FIG. 2.

Figs. 4 and 5 show in plan each of the two parts of the arms.

As shown in fig. 1, the arm comprises two parts 1 and 2. Part 1 is constituted by a part in the form of a frame having two lateral flanks 3 and 4 joined by several transverse branches 5, 6, 7 and 8. The transverse branch 6 has two bores threaded 9 allowing the fixing by a reading head 10.

The branch 6 carries an extension II constituting a support for an insulating plate 12 provided with contacts 13 connected by wires, not shown, at the terminals of the read head 10.

The two branches 7 and 8 have a hole for the passage of a screw 14 controlling the longitudinal movement of a counterweight 15. A spring 16 exerts an elastic force on the counterweight 15 to apply the head of the screw 14 against the branch 8 and make the position of the counterweight independent of their construction.

The arm must be articulated on a carriage, a part 17 of which is visible in FIG. 3. This carriage is intended to slide along a guide 18 to accompany the arm towards the center of the disc during reproduction. The movements of the carriage 17 along the guide 18 can be controlled or obtained in different ways, known in themselves, which are not part of the invention and will therefore not be described in detail.

The articulation of the arm on the carriage 17 is carried out by the upper part 2. This part comprises a body 19 made of plastic material associated with a pivot 20. The conical lower end of this pivot is engaged in a conical bearing 21 carried by a support 22 in the general form of a triangular frame. The upper end of the pivot 20 is engaged in a rectilinear space 23 formed between the two upper half-branches 24 and 25 of the support 22.

The body 19 includes guide and stop parts to make the two parts 1 and 2 integral with one another in a precise relative position. To this end, the body 19 has a transverse branch 26, the ends of which are curved at 27 and which is intended to come into engagement in two recesses 28 in the sides 3 and 4 of the part 1. The curved ends 27 come to bear against the outer faces of the sides 3 and 4.

The body 9 also has two hooks 29 and 30 intended to engage in two openings 31 and 32 of the sides 3 and 4. These sides are elastically deformable in the transverse direction of the arm and carry gripping projections 33 and 34 intended to be pressed one towards the other by the user to deform the sides 3 and 4 so as to bring them closer to one another to facilitate the engagement and disengagement operations between the hooks 29 and 30 and openings 31 and 32.

n is visible in fig. 2 that the body 19 further carries a plate 35 provided with elastic contact blades 36. These blades are intended to cooperate with the contacts 13 of the plate 12 when the parts 1 and 2 are coupled to one another.

In fig. 3, the position of part 1 is shown in dotted lines when it is made integral with part 2. It can be seen that this part 1 has an empty space 37 allowing the pivot 20 and the support 22 to pass.

Thanks to the arrangement described, the change of a read head can be carried out very easily, since it suffices for the user to clamp the projections 33 and 34 one against the other to release the lower part 1 of the arm and separate it from the appliance, the electrical contacts being automatically disconnected. The read head can then be removed very easily to be replaced by another.

For demanding amateurs, it is even possible to acquire as many parts 1 as they have read heads available, so each read head remains permanently mounted on part 1 and the exchange can be done practically instant. In this case, the counterweight 15 is adjusted for each part 1 as a function of the read head with which it is equipped.

This adjustment is facilitated by two notches 38 formed in

** ATTENTION ** end of the CLMS field may contain start of DESC **.