DE154758C

DE154758C -

Info

Publication number: DE154758C
Application number: DENDAT154758D
Authority: DE

Description

KAISERLICHESIMPERIAL

PATENTAMT.PATENT OFFICE.

Vorliegende Erfindung bezieht sich auf eine Zuführungsvorrichtung für die Druckfarbe an Vervielfältigungsmaschinen mit sich drehender Schablonentrommel. Bei den bisher bekannten Vorrichtungen dieser Art wird die Druckfarbe aus einem Behälter durch zwei oder mehrere Verteilungswalzen auf eine Farbwalze und von dieser auf die ,untere Seite der Schablone übertragen. Solche \^rorrichtungen'The present invention relates to a feeding device for the printing ink on duplicating machines with a rotating stencil drum. In the previously known devices of this type, the printing ink is transferred from a container by two or more distribution rollers to an ink roller and from this to the lower side of the stencil. Such \ ^r orrichtungen '

ίο haben jedoch den großen Nachteil, daß sie sehr kostspielig sind, und daß, falls ein Wechseln der Druckfarbe stattfinden soll, jedesmal die sämtlichen Walzen herausgenommen und gewa.schen werden müssen. Es ist also in einem solchen Falle jedesmal eine zeitraubende und umständliche Arbeit erforderlich. Außerdem ist bei derartigen Vorrichtungen ein unangenehmes Tröpfeln der Farbe auf den Arbeitstisch kaum zu vermeiden, weil die Verteilungswalzen, sobald genügend Druckfarbe zugeführt worden ist, nicht eine Zeitlang gänzlich außer Tätigkeit gesetzt werden können, sondern bei jeder Umdrehung nur noch mehr Farbe zuführen.However, ίο have the major disadvantage that they are very expensive, and that if a change of the printing color is to take place, each time all rollers have to be removed and washed. So in such a case it is always one time consuming and cumbersome work required. In addition, such devices unpleasant dripping of the paint onto the work table can hardly be avoided, because the distribution rollers as soon as enough Ink has been supplied, cannot be put out of action for a period of time can, but only add more color with each rotation.

Bei der vorliegenden Erfindung wird die Farbe auf die innere Seite eines als Widerlager für die Schablone dienenden durchlochten Mantels durch eine einzige Walze, die zugleich als Misch- und Farbwalze dient, unmittelbar übertragen, und zwar in solcher Weise, daß einerseits die Druckfarbe, wenn nötig, sehr leicht gewechselt werden kann, indem der Trog mit Inhalt durch einen anderen mit einer ab-weichenden Druckfarbe ersetzt wird, und andererseits die Walze, sobald genügend Druckfarbe zugeführt ist, eine Zeitlang, das heißt, solange genügend Druckfarbe vorhanden ist, leicht außer Berührung mit dem Trommelmantel gesetzt werden kann/ wobei ein Abtröpfeln der Farbe ausgeschlossen ist.In the present invention, the paint is applied to the inner side of one as an abutment for the stencil serving perforated jacket by a single roller, which at the same time serves as a mixing and inking roller, transferred directly, in such a way that on the one hand the printing ink, if necessary, can be changed very easily by the trough with content is replaced by another with a different printing color, and on the other hand, the roller, as soon as enough ink is supplied, for a while, the that is, as long as there is enough ink, easily out of touch with the Drum shell can be set / with a dripping of the paint is excluded.

In den Zeichnungen ist die Erfindung veranschaulicht, und zwar zeigt:The invention is illustrated in the drawings, namely:

Fig. ι eine Seitenansicht, teilweise im senkrechten Schnitt, nach Linie A-B der Fig. 2,Fig. Ι a side view, partly in vertical section, along line AB of FIG. 2,

Fig. 2 eine Vorderansicht, ebenfalls in teilweise senkrechtem Schnitt ;Fig. 2 is a front view, also in partially vertical section;

Fig. 3 ist eine ähnliche Ansicht wie Fig. 1 und zeigt die Farbzuführungsvorrichtung in von dem Druckmantel zurückgezogener Stellung.FIG. 3 is a view similar to FIG. 1 showing the ink supply device in FIG retracted position from the pressure jacket.

ι ist ein mit Druckfarbe gefüllter Trog, in welchem eine kombinierte Misch- und Farbwalze 2 drehbar gelagert ist, deren außerhalb des Troges liegende Enden mit Rädern bezw. Rollen 3 und 4 versehen sind. Der Trog 1 nebst Farbwalze 2 wird von zwei um Zapfen 5 und 6 drehbaren, zweiarmigen Hebeln 7 und 8 getragen, deren untere Arme mit Schraubenfedern 9 und IO verbunden sind. Das andere Ende der Schraubenfedern ist mit den auf den festsitzenden Armen 12 und 13 gelagerten Stellschrauben 14 und 15 verbunden, so daß durch Drehung der Stellschrauben die Federn gespannt und die unteren Arme der Hebel 7 und 8 mehr oder weniger nach der Mitte der Trommel gezogen und die Farbwalze folglich mit größerem oder geringerem Druck gegen den Trommelmantel bezw. Schablonenträgerι is a trough filled with printing ink in which a combined mixing and inking roller 2 is rotatably mounted, the ends of which are located outside of the trough BEZW with wheels. Rolls 3 and 4 are provided. The trough 1 together with the inking roller 2 is surrounded by two pins 5 and 6 rotatable two-armed levers 7 and 8 supported, the lower arms of which are supported by coil springs 9 and IO are connected. The other end of the coil springs is connected to the fixed arms 12 and 13 supported Adjusting screws 14 and 15 connected so that by turning the adjusting screws, the springs are tensioned and the lower arms of the levers 7 and 8 drawn more or less towards the center of the drum and consequently the inking roller BEZW with greater or lesser pressure against the drum shell. Stencil carrier

Claims

can be pressed. When the drum is rotated in the direction of the arrow (Fig. I), the inking roller 2 is rotated in the position shown and the color is consequently transferred from the trough 1 to the inner side of the drum shell 26 and driven through the perforations of the shell by the pressure of the helical spring to finally be printed on the paper through the letter void. In the case of machines with a perforated drum shell for the stencil, means must be provided to automatically retract the ink trough and ink roller as soon as it is guided past the perforated part. This is effected in the present invention in that the front ends of the drum are provided with eccentric running surfaces 16 and 17, by means of which the rollers 3, 4 and consequently the inking roller 2 and the trough 1 are pressed down under tension of the springs 9 and 10, as is illustrated in FIG. 3. Since a steady supply of the printing ink is not only unnecessary, but also causes unclean printing, means must also be provided by which the supply device can be easily and quickly put out of action for a period after sufficient ink has been supplied. This is done in the following way: An eccentric 18 is rotatably mounted on the stationary axis 11, which can be easily rotated with the thumb by means of the arm 19 in the direction of the arrow 2. The inner ends 20 and 21, provided with guide slots, of two push rods 22 and 23, which are connected in the vicinity of the eccentric by means of pins 24, are also mounted on the axis 11. The outer ends of the rods 22, 23 are provided with holes so that a rod connecting the lower arms of the levers 7 and 8 can be felt through. The outer ends of the rod 22 are thus held in the transverse direction (FIG. 2) by the rod 25 and in the longitudinal direction by the pin 24. As soon as the eccentric arm 19 is rotated in the direction of the arrow and the increased part of the eccentric 18 is pressed against the pin 24 as a result, the push rods 22, 23 and at the same time the lower arms of the levers 7 and 8 to the outside or respectively. moved in the direction of arrow 3, whereby the trough with the inking roller in the direction of arrow 4, ie withdrawn or respectively after the inside of the stencil drum. is brought out of contact with the scraper drum. The trough with the inking roller then remains in this position until the arm 19 is pushed back, whereupon the lower arms of the lever 7 are pulled inwards again by the springs 9 and 10 and the inking roller is brought back into contact with the shell of the drum For better pressing through of the paint applied by the paint roller 2 to the perforated outer surface, a special pressure roller 27 can be attached below the paint feed device, as illustrated in dotted lines.

1. Ink feed device on duplicating machines with rotating stencil drum, characterized in that for the purpose of direct application the printing ink from the container onto the drum surface the ink roller (2) together with the container (1) by means of double-armed levers (7, 8) against the drum surface (26) automatically pressed with each rotation of the drum with the aid of springs (9, 10) will.

2. embodiment of the ink supply device according to claim 1, characterized characterized in that one of the double-armed levers (7, 8) is articulated, with its free end on the drum axis guided rod the automatic movement the arm participates, but can be moved by hand by an eccentric located on the drum axis can that the inking roller is moved away from the drum surface and in the retracted Position can be held ineffective.

1 sheet of drawings.