NL8203990A - APPARATUS FOR SYNCHRONOUS MIXING AND SPRAYING OF MULTIPLE DYES. - Google Patents

Description

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Device for synchronous mixing and spraying of several dyes.

The invention relates to a paint sprayer with the special feature that colors can be mixed or changed color during spraying, without the need to interrupt the working process; the sprayer therefore does not need to be emptied and cleaned, which saves time and material.

In the practice of paint spraying, situations often arise in which it would be desirable to be able to switch quickly from one color to another while spraying paints. Particularly in the reprographic industry - where retouching and producing multi-color illustrations are very labor intensive - it will save a lot of time if one has the ability to switch the spray instrument directly to the desired color.

Depending on the intended purpose, different versions can be chosen; a two-needle version for black and white work in the graphics industry, for example, illustrations and retouching; a version with 20 three needles to use for example the three primary colors, and with the version with four needles there is the possibility to add black or white to the three primary colors, so that dark or light shades can be obtained as required .

The technique used has the special feature that it is possible to steplessly switch from one color to another, whereby the necessity is that it must be possible to reproduce a used color later. For this purpose, an indicator has been provided, with which the set dosage can be accurately determined, and in that case it is assumed that only standardized, primary colors are used.

In most versions, the dyes used can remain in their original packaging. The practical importance of this is that drying and loss of material are kept to a minimum, which in turn saves costs.

Especially in the world of art and in the sphere of recreational working with colors, there are special application possibilities, since the use of multiple, individually dosable and mutually controllable primary and secondary air flows can produce different optical effects, e.g. due to incomplete and / or irregular mixing of dyes. Separate dosing of one of the secondary air flows may, however, also be necessary if one or more dye channels must remain closed during spraying.

The designed multi-color sprayer can furthermore be used well for advertising purposes, for example when large surfaces of different colors have to be applied on trucks, on walls of stands and in shop windows.

The invention will now be described and explained with reference to the accompanying drawings.

Figure 1 gives a schematic view of the version with four dosing needles (13) and four paint channels (16). The push button (4-) successively, by pressing, actuates the air valve (6), and also by a backward movement, the connecting rod (5), the latter effecting a tilt 25 to the right of the cylinder (7) of the dosing device. The purpose of this cylinder is to move the paint needles (13) backwards by means of the adjusting surfaces (8) in such a way that one can be moved in advance by means of the dosing controller (12) maintains the adjusted mutual position of the 30 needles when the spraying operation is triggered. The latter is made possible by the fact that the needles (13) are provided with a transverse pin (22) which hooks behind the adjusting face (8); if now the cylinder (7) is turned to the right, the adjusting plane (8), which is fixed to the cylinder by means of pivot point (8a), the cross spider (22), and with it the paint stylus (13), push backwards as far as is determined by the angle at which the adjusting face was pre-set with the aid of dosing controller (12).

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Each of the dosing controllers (12) has a scale (21) on which, by means of the indicator needle (11) shows the extent to which the display area can be adjusted. Very small changes of the angle of the adjusting face 5, which are effected by the fine adjustment of the propeller shaft (9), undergo an increase in scale due to the greater pitch of the propeller shaft (10). The graduation of the magnitude of the angle of the faces makes it possible to reproduce exactly the mixing ratio of the 10 dyes used at a later time.

The invention uses both primary and secondary air flows; the primary air stream, which is supplied via channels (14), serves to atomize the dyes flowing in via the paint channels (16); the secondary airflow is supplied through the channels (15) and can be dosed and controlled in such a way that both the mixing process and the spray pattern itself can be influenced. The use of both primary and secondary air flows in paint spraying devices is known, as described, for example, in Dutch Patent No. 71171. The special feature of the present invention is that the air channels for the secondary air flow are interrupted by a flat annular disc (23) # shown separately in Figure 3. This annular disc contains two recesses (24) # which narrow in the direction of the ends and the greatest width of which is equal to the diameter of the air duct (15).

30 The annular disc contains two protuberances with which it fits into the adjusting ring (17). The adjusting ring contains two threaded inner rings (20), which can move freely with respect to the adjusting ring and which serve to mount the headpiece (25) on the device.

The spit-shaped recesses in the ring disk are arranged in such a way that the left airflow is maximized when it is almost completely squeezed from the right, and vice versa.

For example, when rotating the adjusting ring (17) from left to right 8203990 -4- •, »the airflow through the left channel will decrease in length and it will increase in strength through the right channel until - at point R in the graph of figure 4 -the airflow in the right channel is maximum and that in 5 the left channel is reduced to zero *

When the adjusting ring is rotated further to the right, the air flow in the right channel will also decrease in strength. · The graph in figure 4 further shows that the air flows in the left and in the right channel are equal in strength 10, when the adjusting ring in the middle position (26) is turned. This technique makes it possible to influence and control both the mixing process and the spray pattern. * The graph in Figure 4 is depicted on the header of the device, with an arrow (18) mounted on the adjustment ring. indicates relative and absolute strength of the secondary airflows

The top of the device shown in figure 2 contains, for the four-needle version, a plateau (27), on which the interchangeable cartridges with the desired primary colors can be placed * For the most efficient use of the dyes, the in certain cases it is desirable to manufacture dye cartridges which are for single use (2), while in other cases refillable dye cartridges (3) are preferred.

Figure 5 shows the nozzle of a version with three dosing needles with multiple outlets for secondary air flows on either side.

Figure 6 shows an embodiment provided with permanent dye reservoirs (28).

Figure 7 shows an image of a continuous-use embodiment in which the dyes are supplied via pipes. Otherwise, this embodiment uses the same techniques as previously described. The latter embodiment is particularly suitable for industrial use.

8203990

Claims (11)

1. An apparatus for atomizing dyes, characterized in that the dyes supplied from three dye channels are atomized in such a way that mixing occurs, even before the object 5 to be sprayed comes into contact with the dyes, and mixing color used can be changed immediately by operating one or more dosing controls which control the proportions of the dyes to be mixed, without the need to interrupt the spraying operation. I.Q A device according to claim 1, characterized in that the dyes to be sprayed are supplied via four channels and are metered for the spraying process by means of four needles. A device according to claims 1 and 2, characterized in that the dyes are fed through two dosing needles. A device according to claims 1, 2 and 3, characterized in that the mixing color used during spraying is immediately can be changed by operating one or 20 more dosing controls which control the proportions of the dyes to be mixed, without the need to interrupt the spraying operation. A device according to claim 1, characterized in that the dosing device is provided with a standardized control mechanism, whereby the desired mixing ratio can be accurately determined. 4i * -5- CONCLUSIONS. An apparatus according to claim 1, characterized in that the secondary air flows supplied into the nozzle, which ensure the most complete mixing of the dyes, supplied and atomized by the primary air flow, both by the air flows. on the left side as those on the right side can be dosed separately and are adjustable relative to each other, so that also in those cases in which one or more dye channels are completely, or almost completely closed, the dyes not only continue to undergo complete mixing, but also uniformly can be distributed and steered over the surface to be sprayed. 8203990 -6- * * Λ A device according to claim 6, characterized in that the secondary air flows to be controlled separately under 6 can also be dosed independently of and in proportion to each other, so that different optical effects can be pursued as desired. A device according to claim 1, 2 and 3, characterized in that the supply of the dyes is effected by means of connecting disposable dye cartridges. An apparatus according to claim 1, 2 and three, characterized in that the supply of the dyes is effected by connecting refillable Irleur dye cartridges. A device according to claim 1, 2 and 3, characterized in that the device is provided with solid dye reservoirs. An apparatus according to claim 1, 2 and 3, characterized in that in a situation in which great importance is attached to the continuity of the spraying operation, the dyes are supplied through pipes. 8203990