FR2477471A1 - INKING DEVICE FOR THE APPLICATION OF LIQUID INK TO TAPE PREFERABLY IN PAPER - Google Patents

Abstract

AN INKING DEVICE ACCORDING TO THE INVENTION INCLUDES AN INK 102 CONSTITUTED BY A TRAY 101 FILLED WITH INK 103 IN WHICH IS IMMERSED AT LEAST ONE ROLLER 104 IN ROTATION FOR THE TAKING OF INK. BIN 101 IS AVAILABLE IN A COLLECTOR TANK 101A INTENDED TO COLLECT AND DISCHARGE THE FOAM 113 SPILLING OVER THE EDGE 117 OF THE BIN. A PINCH ROLLER OR CRUSHER, 106 IS IN CONTACT WITH INK ROLLER 104.

Description

Inking device for applying ink

  liquid on moving bands, preferably

paper rence.

  The invention relates to an inking device for the application

cation of liquid ink on moving strips, preferably

paper, comprising an inkwell intended for the storage of liquid ink, a supply line for the inkwell, an ink roller for taking ink from the inkwell, and

a pinch roller rotating in opposite direction, the

  tower is in contact with the periphery of the ink roller, this

pinch roller or crusher used to retain excess ink.

  On anchoring devices of the aforementioned type the ro-

The fastening of the inking and pinching rollers produces a flow of ink in the direction of the triangular slot formed by the above-mentioned rollers. The high hydrodynamic pressure generated there, linked to the turbulence in the

  liquid, results in undesirable foaming.

  Indeed, there is a risk of smearing, because the foam

  thus formed can escape to the outside through openings

  tures formed in the front side of the inking device, in which the rollers are housed, and through an opening, through which the periphery of the inking roller transmits ink on a so-called printing roller intended for

  apply the ink to the moving strip.

  Document DE-OS 2,657,548 describes an inking device for the application of liquid ink on moving strips, on which overflows provided in the tank for the ink whose sections are a multiple feed sections, aim to prevent formation

foam.

  The invention constitutes an improvement of the known inking device; it also aims to prevent in

wherever possible the formation of foam.

  The invention achieves this objective Dar the fact that the inkwell is constituted by a tank filled with enure, in which at least plunges the ink roller, and that the inkwell tank is placed in a collecting tank intended to capture and evacuate the foam pouring out from the edges

inkwell.

  Oven allow the foam to separate more easily from the volume of the foam in the roller area and to settle

  over the edges of delimitation-of the inkwell, the

  vention proposes in another embodiment that the pouring edges of the inkwell are constituted by tearing edges of the foam curved downwards. Another level of influence on the formation is the height of the ink level in the tank and therefore the depth of immersion of the inking and nipping rollers.

  foam. According to another embodiment of the invention

  tion this level can be optimally adapted by the fact that the tray is pivotally mounted about an axis parallel to the axes of the ink and nip rollers in order to adjust the level of ink. According to another embodiment of

  the invention of the openings can be provided in the

  collector for the evacuation of the foam which has

  dumped over the edges of the tank.

  The invention will be described in detail with the aid of an exemplary embodiment illustrated in some of the appended figures, FIG. 1 is a side view showing the conditions of flow of the ink in a known inking device, the side wall is removed,

  Figure 2 is a top view of the encraee device.

  according to Figure 1, the upper wall being removed, Figure 3 is a side view showing an inking device according to the invention (with side wall removed) Figure 4 is a top view of the inking device of the FIG. 3, the upper wall being removed,

Figure 5 shows a detail of the device on an enlarged scale.

tif of anchoring according to figure 4.

FIGS. 1 and 2 show a known inking device 2,

for applying liquid ink on moving strips-

  ment, comprising a tank 1 filled with liquid ink 3, in the

  which are immersed an ink roller 4 which can be

  dragged in rotation and a roller miller or crusher 6 can also

  to be rotated. The trunnions of the rollers pre-

cited bear the marks 4a, 4b, and 6a, 6b. The pin roller

core 6, the periphery of which is pressed against the ink roller 4, rotates in the opposite direction with respect to the ink roller 4

  and limits the liquid film on the ink roller 4. The roller

  the inking water 4 transmits the ink taken from a so-called printing roller 7 which. transfer the ink onto a strip 8, preferably paper. For the models to be carried over, these may, for example, be lines or tiles. A back pressure roller for printing roller 8 is designated

  by 9. An arrival 11 is used for the supply of ink,

  12 to the removal of excess ink and

foam 13.

Due to the opposite rotational movements of the rcu-

ink water 4 and pinch roller 6 a large quantity

ink 3 is swept into the triangular slot 14 o ap-

significant hydrodyna- pressure and turbulence appear

  mics, which results in a very strong foam formation. The current created by the routing effect of the roller -4 - pinch is indicated by arrows 16 (16a and 16b) in Figure 2. The foam 13 discharged in a circular direction with the ink 3 can escape by the front edge 17 of the inkwell and through the openings of the bearings in the region of the trunnions of the rollers 4 and 6 on the front walls 18, which is

eminently undesirable.

  In the invention as illustrated in FIGS. 3 and 4, the elements corresponding to identical elements in FIGS. 1 and 2 are designated by augmented analog references

of 100.

The tray 101 of the inking device 102, in which the ink roller 104 and the pinch roller 106 are immersed, receives the ink 103 by way of the supply 111. The reference 111a designates a supply pipe, the 111b the connection tube on the tank 101. The tank 101 is relatively flat, that is to say in the form of a bowl; it is placed in a collecting tank 1Ola intended to collect and evacuate the foam 113 flowing over the edges 117. The foam 113 which flows or flows drop by drop immediately after its formation reaches the

discharge openings 112 having sections relating to

ment large and from there can leave the inking device.

  The upper edge 117 of the tank 101 is partially represented in FIG. 5. The edge ends with an edge 117a curved downwards which has the purpose of allowing the foam 115 pouring over the edge of the tank, to come off more easily and to flow into the collecting tank 101a disposed below the tank. The edge 117a is particularly advantageous on the side of the tray 101 associated with the printing roller 107. But it can also be provided on the front side of the tray 101 (reference 117b on the

figure 4) or on the front side (mark 117c in figure 4).

  - 5- To be able to optimally maintain the level of the ink 103 in the tank 101 and to suppress the formation of foam, the tank 101 is pivotally mounted around an axis 121

parallel to the axes of rollers 104 and 1o6.

  Unlike the known inking device, the device according to the invention prevents the formation of foam from the start, since the foam is separated from the ink reserve.

  proper and evacuated soon after its formation.

As it goes without saying, and as it already follows from the foregoing, the invention is in no way limited to those of its modes of application and embodiments which have been more particularly envisaged; on the contrary, it embraces

all variants.

Z477471

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Claims (2)

Claims X claims I - Inking device for the application of liquid ink on moving strips, preferably of paper, comprising an inkwell for storing liquid ink, a supply line for the inkwell, an inking roller in rotation for taking up ink from the inkwell, and a nip or crushing roller whose periphery is in contact with the periphery of the inking roller, the pinching roller rotating in opposite directions and serving to retain] A-'surplus ink, characterized in that the inkwell (102) consists of a tank (101) filled with ink (105), in which at least the ink roller (104) is immersed, and that the tank is disposed in a collecting tank (101a) intended to collect and evacuate the foam (115) pouring over the edge (117) of the tank. 2 - An inking device according to claim 1, characterized in that the pouring edges of the tank (101) are killed by downwardly curved edges (117a) used to detach the foam (115). - Inking device according to claim I or 2, characterized in that, to adjust the level of the ink, at least the tank (101) is pivotally mounted about an axis (121) parallel to the axes of the ink roller (104) and the roller pinch water (106).   4 - Inking device according to any one of the resales dications previous, characterized in that the tank manifold (101a) has at least one flow opening ment (112) for the foam (115).