FR2646807A1

FR2646807A1 - Carousel for multi-colour silk screen printing with horizontal axis

Info

Publication number: FR2646807A1
Application number: FR8906214A
Authority: FR
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-05-11
Filing date: 1989-05-11
Publication date: 1990-11-16
Anticipated expiration: 2009-05-11
Also published as: FR2646807B1

Abstract

The invention relates to a specific arrangement of the screen holders in a multi-colour printing press, the arrangement allowing a significant reduction in the overall size of a machine for the same characteristics according to the state of the art. As the axis 2 of the machine, similar to a carousel, is horizontal, unlike the state of the art, a system composed of a rigid polygon 9 rotating about a cylindrical track 11 which is offset with respect to the axis 2 of the carousel and connected to the branches 1 of the said carousel allows the screen holders 8 to remain in a suitable position during rotation. The fabric to be printed is stretched over the printing table or "sleeveboard" 4 past which the screen holders file in succession, rapidly being pre-positioned with the aid of sprung pushers 14 and being locked accurately by virtue of the unit 15 which receives the cap 16 of the folded-down screen holder. An automatic system raises the latter after printing. The embodiment presented for 6 colours may include more or fewer of them as required.

Description

La présente invention concerne une disposition particulière des porte-éorans sur une rachine d'imaression sérigraphique multicouleur. The present invention relates to a particular arrangement of the eoran carriers on a rachine of imaression serigraphic multicolor.

Dans l'état actuel de la technique, lorsqu'il s'agit d'une machine multicouleur, les porte-écrans sont répartis autour d'un car- rousel dont l'axe de rctation est vertical imposant un encombrement important qui auerente rapidement en faonction de l'augmentation du norbre de couleurs. In the current state of the art, when it is a multi-color machine, the screen-holders are distributed around a carousel whose rctation axis is vertical imposing a significant bulk which quickly increases function of increasing the number of colors.

La recherche du gain de place s'est orientée vers la disposition des porte-éorans sur un carrousel dont l'axe de rotation est horizontal; ce choix nécessite un système de stabilisation des porteécrans pendant la rotation afin de permettre à l'encre pâteuse de rester en place. De plus la technique rulticouleur irpose une précision dans la position relative, au poste de travail des oorte-écrans et des pièces à imprimer. Cette précision est obtenue, d'une part, à l'aide d'un bloc de pré-positionnenent et d'une chape de centrage particuliers à chaque ensemble porte-écrans et, d'autre part, grâce à un auto-centrage des tables d'impression ou "jeannettes". après impression, les porte-écrans se relèvent automatiquement pour se dégager du poste de travail. The search for space saving was oriented towards the arrangement of the eoran carriers on a carousel whose axis of rotation is horizontal; this choice requires a stabilization system for the screen holders during rotation in order to allow the pasty ink to remain in place. In addition, the multi-color technique imposes a precision in the relative position, at the workstation of the screen screens and the parts to be printed. This precision is obtained, on the one hand, by means of a pre-positioning block and a centering yoke specific to each screen holder assembly and, on the other hand, by self-centering of the printing tables or "jeans". after printing, the screen holders are automatically raised to free themselves from the workstation.

La figure 1 représente une vue de face de la rachine
La figure 2 reDrésente une vue de gauche de la machine
Les figures 3 4et5 représentent le détail du positionnement au poste
de travail.Figure 1 shows a front view of the rachine
Figure 2 shows a left view of the machine
Figures 3 4 and 5 show the detail of positioning at the post
of work.

Selon là forre-de réalisation exposée dans la denande de brevet, il s'agit d'un carrousel d'impression en 6 couleurs. Ce nombre de couleurs a été choisi comme fournissant un exemple probant de gain de place pour un nombre de couleurs jugé iriportant dans la technique sérigraphique. Ce nombre peut varier en plus ou en moins. According to the form of realization exposed in the patent denande, it is a printing carousel in 6 colors. This number of colors was chosen as providing a convincing example of saving space for a number of colors deemed to be important in the screen printing technique. This number may vary more or less.

La rachine se compose d'un carrousel à 6 branches (1) dont l'axe de rotation (2) est horizontal et d'un poste de travail comprenant un socle mécano-soudé (3) portant à sa partie supèrieure les tables d'impression ou "jeannettes" (4) sur lesquelles est tendu le tissu à imprimer. The rachine consists of a carousel with 6 branches (1) whose axis of rotation (2) is horizontal and a work station comprising a mechanically welded base (3) carrying at its upper part the tables of printing or "jeans" (4) on which the fabric to be printed is stretched.

A l'extrèmité de chaque branche du carrousel oscille un axe (5) supportant une mâchoire (6) à serrace à vis (7) dans laquelle se fixe le porte-éoran (8)
Afin que les porte-écrans restent dans une position quasi - ment horizontale pendant la rotation du carrousel, ie système de stabilisation se coroose d'un polyaone ri cri de (9) contenu dans un plan vertical et tournant en synchronisation avec les branches du carrousel grace à des galets (10) sur une piste (11) excentrée par rapport à l'axe de rotation (2). Ce polygone est relié aux 6 branches (1) du carrousel par des biellettes (12) dont la longueur est énale à l'ex- centrage cité plus haut.At the end of each branch of the carousel oscillates an axis (5) supporting a jaw (6) with screw lock (7) in which the eoran holder (8) is fixed
So that the screen-holders remain in an almost horizontal position during the rotation of the carousel, the stabilization system is made up of a laughing polyaone of (9) contained in a vertical plane and rotating in synchronization with the branches of the carousel by means of rollers (10) on a track (11) eccentric with respect to the axis of rotation (2). This polygon is connected to the 6 branches (1) of the carousel by connecting rods (12) whose length is equal to the eccentricity mentioned above.

Lorsqu'un porte-écran releve se présente devant le poste de travail, le vé (13) situé à l'extrémité de L'axe oscillant (5) s'indexe manuellement sur le poussoir à ressort (14) inclus dans le bloc de pré-positionnement (15). La position rigoureuse imposée par la technique multicouleur est ainsi assurée. En rabattant le porte-écran, la chape de centrale (16) vient se verrouiller sur le bloc de prépositionnenent (15) dont la partie sunérieure est pentée. When a raised screen holder is present in front of the workstation, the vee (13) located at the end of the oscillating axle (5) is manually indexed on the spring plunger (14) included in the block pre-positioning (15). The rigorous position imposed by the multicolor technique is thus ensured. By folding down the screen holder, the central cover (16) is locked on the prepositioning block (15), the lower part of which is sloping.

L'opérateur peut alors, à l'aide des racles de bois, exécuter son travail d'impression. The operator can then, using the wooden scrapers, execute his print job.

Après impression, le Dorte-écran se retrouve en position relevée (17) orâce à deux ressorts (18) dont la tension est réglable selon son poids. After printing, the screen lifter is in the raised position (17) thanks to two springs (18) whose tension is adjustable according to its weight.

Enfin, les différents modèles de tables d'impression ou jeannettes (4) sont positionnées sur le socle grâce à deux qoujons (19)
L'encombrement en hauteur, largeur profondeur (jusqu'aux extrèmités des porte-écrans de plus arande dimension) est tel crue cette machine n eut être utilisee, contrairement à l'état de la technique, dans des ateliers de petites dimensions.Finally, the different models of printing tables or jeans (4) are positioned on the base thanks to two studs (19)
The size in height, width depth (up to the ends of screen holders of larger size) is such raw this machine could not be used, unlike the state of the art, in small workshops.

Enfin, on peut imaginer en option, toutes sortes de tables d'impression adaptées aux différents matériaux à imprimer, soit à plat, soit sur des surfaces concaves. Finally, we can imagine as an option, all kinds of printing tables adapted to the different materials to be printed, either flat or on concave surfaces.

Claims

REVENPICATIONS

1) Multicolor screen printing machine characterized by the distribution of screen holders (8) around a carousel rotating in a vertical plane. The machine further comprises a device for stability of the screen holders (8) during rotation, a pre-positioning block (15) and a lock at the work station, a self-centering of the printing tables or " jeannettes "(4) and an automatic screen lifting system.

2) Multicolor serigraphic printing machine according to claim I characterized by a carousel the axis of which (?) Of which is horizontal.

3) $ multicolor screen printing machine according to claim 1, the device for stability of the eoran carriers (8) during rotation is characterized by a rigid polygon (9) contained in a vertical plane and rotating in synchronization with the carousel thanks to rollers (10) on a cylindrical track (11) eccentric with respect to the horizontal axis (2J of the carousel.

4) Multicolor screen printing machine according to claim 3 for which the synchronization of the rotation of the carousel and the stability polygon (9) is characterized by the length of the rods (12) which is equal to the eccentraae between the axis (2) of the carousel and the axis of the cylindrical track (11).

Js Multicolor serial printing machine according to claim 1, the pre-positioning of which at the work station is characterized by a vee (13) located at the end of the oscillating axis (5) and it is manually indexed on the pusher spring (14) included in the pre-positioning block (15) 6) Multicolor screen printing machine according to claim I, the lock on the pre-positioning block (15), at the workstation is characterized by a centering yoke (16) centered on the end of the oscillating axis (5) and coming to lock on said block (15) whose upper receiving part is toothed 7) Multicolor screen printing machine according to claim I whose the automatic lifting of the screen holders is characterized by two springs whose tension is adjusted according to their weight.