JPH0226862B2 - - Google Patents

Description

Detailed description of the invention [Industrial field of application] The present invention relates to a device for uniformly applying a fluid medium to a carrier or a strip, optionally via a stencil. The present invention relates to a type in which a displacement pump device equipped with gears is connected forwardly to a discharge passage for use.

[Prior Art] In textile printing presses, and in particular in stencil printing machines, and in machines for applying waterproofing, inking and applying adhesives, etc., it is common to apply a fluid medium to a carrier, in particular to a strip. There are particular problems when applying In such cases, it is necessary to keep the pressure applied to the medium to be applied constant during the entire working process, while the working width of the machine is 5 m and more, so that the fluid medium can be applied at the highest possible speed. It is necessary to apply In other words, it is necessary to keep the pressure applied to the medium constant over the entire working width so that the desired amount of fluid medium can always be supplied.

In a squeegee device in a stencil printing machine, when the squeegee casing has a gap-shaped opening that faces toward the inside of the stencil or toward the strip, ink is supplied to the inside of the squeegee casing via a pump. It has already been proposed to do so. However, pumps of this type have unavoidable pressure fluctuations, which cause marks on the strip surface during the printing operation. Other methods of supplying ink to the squeegee include the use of elevated ink containers; in this case, the ink pressure is increased by the liquid level in the elevated ink container. It is based on In this type, losses occur due to the flow of ink and a considerable amount of ink scum remains in the squeegee and in the supply tube at the end of the printing process or when it is replaced. This increases costs, especially if the printing process is short.

It has also been proposed to provide a displacement pump device within the squeegee casing.

OBJECT OF THE INVENTION It is an object of the invention to provide an improved device for uniformly applying a flowable medium.

[Means for solving the problem] This problem is achieved according to the invention in a device of the type mentioned at the outset for uniformly applying a fluid medium to a carrier or a strip, which is provided in a displacement pump device. Two gear wheels are mounted floating within the casing of the displacement pump device;
The solution is that the two gears are movable until they come into contact with the inner wall of the casing.

[Effects] According to the invention, it is possible to supply the fluid medium completely uniformly over a significantly large working width to the projecting channel for the medium. The gear wheel can be arranged in the immediate vicinity of the protruding channel, so that, for example, the ink scum at the end of the printing process is relatively small and does not pose any particular problem. Furthermore, the device according to the invention has the advantage that it is easy to assemble, yet operates reliably and is less prone to breakdowns.

[Example] Next, the configuration of the present invention will be specifically described with respect to an example shown in the drawings.

According to FIG. 1, the device according to the invention consists of a housing 1 in which a recess 2 is provided. There are 2 in this notch 2.
Two gears 3 and 4 are arranged. These gears 3, 4 mesh with each other. These gears 3, 4 are arranged floating or cantilevered in the recess 2. That is, it is movable in the radial direction within the casing. At least one end of at least one of these gears 3, 4 is connected to a drive system (not shown) with play in the axial direction. As can be seen in FIG. 1, in the stopped state, the two gears 3, 4 are in contact with points 5, 6 at the lower part of the inner surface of the notch 2 due to their own weight.

When the device according to the invention is operated, i.e. 2
When at least one of the two gear wheels 3, 4 is driven and the casing is filled with a fluid medium, e.g.
is rotated in the direction of , forcing the filled medium into the chamber 9. This chamber 9 is the lower part 1 of the notch 2.
0 and the two gears 3, 4. A pressure builds up in this chamber 9. This pressure is indicated by point 11 and arrows 12, 13, 14. The forces in the directions of arrows 12 and 13 are applied to the gear 3,
4, this gearwheel 3, 4 is moved to the inner wall, i.e. points 15, 16 in the upper region of the inner surface of the notch 2.
Push it until it hits. The pressing force is arrow 1
7,18.

At the bottom of the casing 1 is a slit-shaped nozzle 19.
This slit-shaped nozzle 19 has a discharge passage 20 and a discharge opening 21. The pressure created in chamber 9 is also created in discharge passage 20 . This pressure is indicated by the arrow 14 and causes the fluid medium present in the discharge passage 20 to be ejected completely uniformly through the discharge opening 21 .

By means of the floating or cantilevered gearwheel, the fluid medium is supplied completely uniformly into the pressure chamber, so that a constant pressure is built up in this pressure chamber. This constant pressure is transmitted over the entire working width of the discharged medium. two gears 3, 4
By varying the rotational speed of the pump, the pressure and thus the amount of fluid medium discharged can be easily adjusted.

1 and 2, a flowable medium is shown being applied to a strip 23 via a stencil 22. In FIGS. In this case, the strip material 23 is
I am running on 4. Omitting stencil 22,
The fluid medium can be applied directly to the strip or also to other carriers, such as plates, profiles or the like. It is also possible to design the housing 1 itself to be movable or even height-adjustable. This possibility of movement is indicated by arrow 25.

An important point in the invention is that the inner surface of the casing 1 surrounds a portion of each of the gears 3, 4 with play. It is advantageous if this inner surface of the casing 1 is cylindrical and its diameter is slightly larger than the diameter of the gearwheel 3 or 4.

If the fluid medium forms bubbles, the pressure chamber formed by the chamber 9 and the discharge passage 20 may be divided into a plurality of chambers as shown in FIGS. 3 and 4. . Foam requires very careful handling. This is because, if not handled carefully, the foam will collapse or its structure will change and it will no longer be able to meet its requirements. According to FIGS. 3 and 4, the discharge passage 20 is provided with a cylindrical chamber 26. As shown in FIGS. This chamber 26 completely compensates even the smallest pressure differences, so that problems or irregularities are unlikely to occur when the foam is applied to the strip or carrier. Third
Although the chamber 26 shown in the figures and FIG. They may be provided one after the other. The chamber 26 is accessible by personnel from one or both sides so that cleaning equipment, such as water hoses, scrapers, brushes, etc., can be introduced into the chamber 26. By using the extension, the cleaning device can also simultaneously clean the connection between chamber 26 and chamber 9 or between chamber 26 and the outlet.

In many cases, it may be advantageous to have a special configuration of the outlet opening 21, for example as shown in FIG. According to the embodiment of FIG. 5, one or both side walls 27 are provided with grooves 28, so that a series of individual channels with very small cross-sections is formed in the outlet opening 21. By providing such grooves,
It is possible to form the individual passages to be completely similar and to maintain a predetermined exact spacing. Also,
A grooved sheet material, for example a corrugated sheet material, may be inserted into the discharge opening 21 . In this case as well, individual passages having the shape described above are formed.

In order to close part of the passage and adapt the working width of the device to the requirements, the following measures can be taken. In other words, to close the passage,
As shown in FIG. 4, a slider is provided within the chamber 26. In the embodiment according to FIG. 4, this slider is constructed as a tube 29 with an opening 30, so that excess flowable medium flows through the opening 30 into the tube 29. This tube 29 is closed on one side and connected to a connection on the other side.
This allows excess flowable medium to be removed from the device. This is particularly important where the discharge passage is interrupted. This is because, if this excess fluid medium is not allowed to drain off, there is a risk that the pressure will build up very quickly. This is a disadvantage in open discharge points and other disadvantages.

6, 7 and 8 show different embodiments of the running edge of the discharge nozzle. According to FIG. 6, the limiting wall of the discharge opening 21 at the rear in the direction of movement of the strip is arranged at a predetermined distance from the strip, while the limiting wall at the front in the direction of movement of the strip is arranged at a predetermined distance from the strip. The limiting wall has a spherical tip and is longer than the rear limiting wall so as to reach close to the surface of the strip. According to FIG. 7, the rear limiting wall in the direction of movement of the strip is the lip 31.
According to FIG. 8, an elastic lip 32 is fixed to the rear limiting wall. The discharge nozzle shown in the embodiment of FIG. 6 makes it possible in particular to apply a surface layer.

The invention is not limited only to the illustrated embodiments. It is therefore also possible to provide a container for the fluid medium 7 outside the casing 1.
The two gears do not necessarily have to have the same diameter. Depending on the desired efficiency of the two gears, the teeth of these gears can be selected. The gear teeth for the device according to the invention are relatively coarse, but it is also possible to provide significantly finer teeth. As already mentioned, both flat and round stencils can be used with the device according to the invention, so that any type of carrier and strip with any fluid medium can be handled. In particular, the device according to the invention is suitable for printing on textiles, but it can also be used for inking, gluing, waterproofing, patterning or the like.

The device according to the invention can be installed in any installation space or in any coating device. In particular, when applying from the bottom to the top, it is convenient to use the principle of a communicating container. In this case, the medium to be applied is pressed against the gear wheel 3 by adjusting a container provided outside the device.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a stopped state of the apparatus according to the first embodiment of the present invention, FIG. 2 is a schematic diagram showing the operating state of the apparatus shown in FIG. 1, and FIG. 4 is a schematic diagram of the device according to the second embodiment, FIG. 4 is a schematic diagram of the third embodiment, FIG. 5 is a sectional view taken along line A-B in FIG. 4, and FIG. 6 is a running edge of the discharge nozzle. FIG. 7 is a schematic enlarged view of an embodiment of the variation of the running edge of the discharge nozzle; FIG.
The figure is a schematic enlarged view of a variant embodiment of the running edge of the discharge nozzle. 1...Casing, 2...Notch, 3, 4...
Gear, 5, 6...point, 7...medium, 8...
Arrow, 9...chamber, 10...bottom, 11...point, 1
2, 13, 14...Arrow, 15, 16...Point, 19...Slit-shaped nozzle, 20...Discharge passage, 21...Discharge opening, 22...Stencil,
23... Band material, 24... Counter impression cylinder, 25... Arrow, 26... Chamber, 27... Side wall, 28... Groove, 2
9...tube, 30...opening.

Claims (1)

[Scope of Claims] 1. A device for uniformly applying a fluid medium to a carrier or a strip 23, comprising a discharge passage 2 for the medium.
0, in which a displacement pump device with gear wheels 3, 4 is connected forward, the two said gear wheels 3, 4 being mounted in a floating manner in the casing 1 of the displacement pump device; Device for uniformly applying a fluid medium, characterized in that the two gear wheels 3, 4 are movable until they come into contact with the inner wall of said casing 1. 2. The device according to claim 1, wherein the inner wall of the casing 1 surrounds a portion of each of the two gears 3, 4 with play. 3. A patent claim in which each of the notches 2 of the casing 1 that covers one of the two gears 3 and 4 is formed in a cylindrical shape and has a diameter slightly larger than the diameter of the gears 3 and 4. The device according to item 1. 4. Any one of claims 1 to 3, wherein at least one end of at least one of the shafts of the two gears 3, 4 is connected to the drive device with play maintained in the axial direction. The device described. 5. Claims 1 to 4, wherein a pressure chamber is formed between the two gears 3 and 4 and a part of the inner wall of the casing 1 surrounding these two gears 3 and 4. The device according to any one of the preceding items. 6. Claim 1, wherein the pressure side of the gear of the casing 1 is configured as a nozzle 19.
The device according to any one of Items 1 to 5. 7 The pressure chamber 9 formed between the casing 1 or the nozzle 19 and the gears 3, 4
7. The device according to claim 1, wherein the device is partitioned into a plurality of chambers (26) extending parallel to the axis of the device. 8. Any one of claims 1 to 7, wherein a worker can approach the chamber 26 from both horizontal ends of the chamber 26 in order to carry in a cleaning device. equipment. 9. Device according to one of the claims 1 to 8, characterized in that the nozzle (19) is constructed as a longitudinal slit extending over the entire working width. 10. The device according to claim 9, wherein at least one of the two side walls 27 forming the longitudinal slit has a groove 28 extending in the direction of medium flow. 11. A slidable slider is inserted into the chamber 26 for closing a part of the longitudinal slit in a direction perpendicular to the direction of medium flow;
An apparatus according to any one of claims 1 to 8. 12 The slider is configured as a tube 29, one end of which is closed and the other end led out via a connection, the tube 29 being closed at one end and led out via a connection.
an opening 3 for introducing a fluid medium into 9;
2. A device as claimed in claim 1, characterized in that a zero is provided so that the flowable medium is led out of the device.