JPH10180988A - Device for feeding fluid printing ink to printing mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the uniformity of a printing ink which is transferred onto a roller from a nozzle, and perform a uniform printing by a method wherein a spraying port of the nozzle is spaced away from a gap where an ink liquid- air mixture which is formed by compressed air, flows in. SOLUTION: A fluid, especially a thin liquid-form ink for printing exists in a storage tank equipped with a flow-out port 8, e.g. a generally known cartridge 7. The ink for printing is guided to the flow-in port 9a of an applying device 11 from the flow-out port 8 through a printing ink guide pipe 9, and the applying device 11 ends at a nozzle 12 equipped with a spraying port 12a. From the spraying port 12a, an ink liquid-air mixture 13 is sprayed in a gap 14 between two feeding rollers 16, 17 which rotate while being in contact with each other. The feeding roller 17 is a so-called ink feeding roller, and provides the printing ink which exists on the peripheral surface to the other roller, i.e., an ink transfer roller 18 which transfers the ink onto the jacket of a printing roller 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for supplying flowable printing ink through a nozzle to a printing mechanism for a cigarette-coated paper tape in a cigarette continuum maker.

[0002]

BACKGROUND OF THE INVENTION The concept of "flowable printing inks" refers to these materials, including dilute and thick liquid inks. The invention is also applicable in the tobacco processing industry to other coated paper tapes which are to be continuously wrapped around a continuum of, for example, filter material or cigarette wrapping paper, if any.

In a continuum making machine for producing cigarettes, a cigarette-coated paper tape is continuously wound around a tobacco continuum, and the overlapping edges of the cigarette-coated paper tape are glued together to form a cigarette. Is cut from the cigarette continuum thus formed. In the supply area of the cigarette-coated paper tape, an ink is formed on the cigarette-coated paper tape, appears on the cigarette, and is provided with a printed image, often referred to as a cigarette, sometimes referred to as a "stamp". What is decisive for the desired uniformity of the printed image is how the ink is guided uniformly from a reservoir, for example an ink cartridge, to the ink transfer rollers, from which the original printing rollers or stamping rollers are transferred. To perform the ink transfer.

[0004] US Patent Nos. 4,535,693 and 3,
No. 345,943 discloses a supply device for printing inks, in which the ink removed from the storage container is designed to be pushed as wide as possible by a nozzle into the gap between the two rollers. However, in this case the spraying takes place by means of a nozzle which ends shortly before the roller. With such an arrangement, a uniform application of the printing ink on the supply roller and subsequently on the printing roller cannot be achieved.

[0005]

The problem underlying the present invention is to achieve an improved uniform application of the printing ink from the nozzles onto the rollers.

[0006]

SUMMARY OF THE INVENTION According to the present invention, there is provided an ink in which the spray orifice of a nozzle actuated by a compressed gas, in particular compressed air, is formed by two rotating rollers and the ink is formed by compressed air. Liquid-air-
This is solved by being spaced from the gap into which the mixture flows.

[0007] Advantageous configurations according to the invention are defined in claims 2 to 9. The present invention will be described in detail below with reference to the embodiments of the invention illustrated in the accompanying drawings.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A cigarette-coated paper tape 1 drawn from a bobbin (not shown) is supplied to a printing roller or a stamping roller 3 driven by a turning roller 2. A printed image (not recognized here) is formed on the jacket of this roller. The printing roller 3 transfers the printing ink contained in the printed image to the cigarette-coated paper tape 1 moving in the direction of the arrow 6 at the point of contact with the counterpart roller 4, whereby the corresponding printed image is printed on the cigarette-coated paper tape. It is formed.

The fluid, especially thin, liquid printing ink is present in a storage tank provided with an outlet 8, for example a cartridge 7 known per se. The printing ink is led from the outlet 8 through the printing ink conduit 9 to the inlet 9 a of the coating device 11. The application device terminates in a nozzle 12 provided with a spray port 12a. From this spray opening, an ink liquid air-air mixture 13 is sprayed into a gap 14 between two supply rollers 16, 17 rotating in contact. The supply roller 17 is a so-called ink discharging roller, and supplies the printing ink existing on the peripheral surface to the other roller, that is, the ink transfer roller 18 that transfers the printing ink onto the jacket of the printing roller 3. As the coating apparatus 11 provided with the nozzle 12, for example, 78380 in France
A device sold as "Spray Valve 780S" manufactured by Dosage Co., Ltd., 62-70, Ivan-Trugenef-gai, Boujfal can be used. The applicator 11 supplies printing ink via a printing ink conduit 9 and an inlet 9a, and compressed air via conduits 19 and 21 provided with an inlet 19a and a spray port 21a. The compressed air coming through conduit 19 atomizes the printing ink liquid provided from nozzle 12. The compressed air coming from the conduit 21 provides a metering of the printing ink liquid supplied to the nozzles 12. The amount of printing ink is increased by increasing the opening (opening) time of nozzles that are sequentially opened and closed at high speed (when the demand for printing ink increases due to an increase in the supply speed of the cigarette-coated paper tape 1), It is adapted to the alternating speed of the cigarette-coated paper tape 1 in such a way that it is shortened (when the demand for printing ink is reduced due to the reduced supply speed of the cigarette-coated paper tape 1). For this purpose, a time detector 21 is used, which shortens or lengthens the opening time of the switching valve 23 depending on the speed of the cigarette-coated paper tape. The switching valve is provided in a compressed air line 24 through which compressed air is supplied to the compressed air line 21 and from there to the application device 11 via an inlet 21a.

[0010]

With the device according to the invention, the uniformity of the printing ink transferred from the nozzles onto the rollers is such that the printing ink-air-fog is formed and finely dispersed in the roller gap. It is reached by a drop of ink, whereby the printing by the printing roller is performed uniformly.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the device according to the invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cigarette coated paper tape 2 Deflection roller 3 Printing roller 4 Counter roller 8 Outlet 9 Printing ink conduit 9a Inflow 11 Coating device 12 Nozzle 12a Nozzle outlet 13 Printing ink liquid-air-mixture 14 Roller gap 19 Conduit 19a Flow Inlet 21 Conduit 21a Inlet

Claims (6)

[Claims] 1. A device for supplying fluid printing ink by means of a nozzle to a printing mechanism for a cigarette-coated paper tape in a cigarette continuum maker, the nozzle being operated by a compressed gas, in particular compressed air. Spraying port (12a) has two rotating rollers (16.1).
7. An apparatus according to claim 7, characterized in that it is spaced from the gap (14) through which the ink liquid-air mixture (13) formed by compressed air flows. 2. The device according to claim 1, further comprising a printing roller for printing a print image on the cigarette-coated paper tape behind the roller. 3. The device according to claim 1, wherein a metering device is provided for the supplied printing ink. 4. The device according to claim 3, wherein the printing ink supplied is metered in a manner dependent on the speed of the cigarette-coated paper tape. 5. The nozzle according to claim 1, wherein the spray port of the nozzle is openable and closable periodically. apparatus. 6. A spray nozzle (12a) of a nozzle (12) which can be opened and closed with a somewhat longer time period for dispensing the supplied printing ink. 6. The device of claim 5, wherein