WO2000038919A2

WO2000038919A2 - Marking device

Info

Publication number: WO2000038919A2
Application number: PCT/AT1999/000295
Authority: WO
Inventors: Peter Pucher
Original assignee: Pms Elektrotechnik Gmbh
Priority date: 1998-12-29
Filing date: 1999-12-02
Publication date: 2000-07-06
Also published as: AU1644100A; AT406491B; WO2000038919A3; CA2358518A1; ATA218498A; EP1140496A2

Abstract

The invention relates to a device for marking a thin, continuously moving material web (1), preferably a paper web. The invention provides for a rotationally mounted print head (2) for applying a marking ink to the material web (1) which by means of an automatic or manually actuated device (3) can be moved from a normal position (R) in which it is situated a short distance from the material web (1) into a marking position (M) in which it contacts a lateral edge (4) of said material web (1). The invention further provides for a device (5, 6, 7) for delivering the marking ink to the print head (2).

Description

Marking device

The invention relates to a device for marking a thin, continuously moving material web, preferably a paper towel.

Such devices are used primarily in the paper industry to indicate material defects or quality defects of the paper web recognized by detector systems or the operating personnel by means of a color marking. Such marking systems are, however, also to be used for marking other material webs, such as fabric webs or plastic foils.

Marking systems are primarily used in the paper industry at the moment, which work on the principle of a paint or spray effect. The marking takes place on the drive-side paper edge in an area of 20 mm on the paper surface. The function of the system depends on the nature of the paper surface and the current paper speed. The marking can usually only be done when the paper balin is horizontal.

In addition to the paint, spray systems require other components such as control and spray air as well as water or other diluents as aids for the marking process. All of the components mentioned are controlled via a separate system in order to bring the marking color onto the paper balin at the right time. In practice, however, it has been shown that malfunctions occur again and again in the known systems, since paper dust can get into the marking ink through the open color cycle, which immediately impairs the function. Clogging of the spray nozzles leads to contamination of the paper web outside the marking area as well as considerable contamination of the guiding and control devices for the paper web. This results in high maintenance and repair costs as well as many complaints from product customers. In addition, the known methods of coloring and energy consumption are very high.

Furthermore, the known methods for color marking cannot be used in paper tear counting; paper counting strips are still used here.

The object of the present invention is to propose a device for marking a thin web of material which is in a continuous movement, which is characterized by low dye and energy consumption and can be used without problems with regard to maintenance and repair.

This object is achieved in that a rotatably mounted printhead is provided for applying a marking ink to the material web, which by means of an automatically or manually operated device from a rest position at a short distance from the material web into a marking position in contact with a lateral edge of the material web is movable, and also that a device for feeding the marking Color to the print head is provided. Advantageously, the device according to the invention does not use a part of the surface of the material web but rather the side edge, the print head being brought up to the side edge when the ink is applied. This minimizes ink consumption and largely prevents the ink from being sprayed or sprayed onto other areas of the paper web or paper machine. Furthermore, the marking can also be used without problems when the paper web runs vertically.

In a particularly advantageous embodiment, it is provided that the print head is designed as a cylindrical disk and has an axis of rotation that is substantially perpendicular to the plane of the material web, a drive device acting on the print head being provided, which drives the print head even before contact with the accelerates the lateral edge of the material web to a speed which is matched to the speed of the material web. Since the rotating print head is accelerated to a suitable speed before it comes into contact with the lateral edge of the material web, the ink application can be optimized and wear on the print head can be minimized.

The device according to the invention is characterized by an increased availability with increased Markicr quality, with the reject being minimized.

The invention is explained in more detail below on the basis of the illustration of an exemplary embodiment variant.

The device for marking a thin, continuously moving material web 1 has a rotatably mounted printhead 2 (marking stone) for applying a marking ink, which is automatically or manually operated 3 from a rest position R at a short distance a from the material web 1 can be moved into a marking position M (indicated by dashed lines) in contact with a lateral edge 4 of the material web 1. Furthermore, a device 5, 6, 7 is provided for feeding the marking ink to the print head 2. The print head 2 has an axis of rotation 2 ′ which is essentially perpendicular to the plane of the material web 1 and is already accelerated with a drive device 9 ΛΌΓ contact with the lateral edge 4 of the material web 1 to a speed which is matched to the speed of the material web 1.

In the example shown, the device for supplying the marking ink consists of an ink container 5 with a constant fill level, a capillary suction section 6 leading to the outer periphery of the print head 2, for example an ink felt, and a storage container 7. The ink felt transfers the marking ink to the outer periphery of the Printhead 1 consisting of a porous material which transfers the color to the outer edge 4 of the paper web. The fill level in the paint container 5 is kept constant in a known manner via two lines 10 and 11, starting from the supply container 7 and opening into the paint container 5, one of which projects into the air space of the supply container 7. Due to the static level control in the ink tank 5, there is always the same pre-print for the ink delivery to the print head 2. In order to prevent the ink system from running empty, a fill level sensor 8 can be installed in the ink tank 5, which sensor is connected to the communicates with electronic control 16 and triggers an alarm device from an adjustable fill level.

The viscosity of the marking paint must be set so that the paint remains liquid in the primary circuit and dries up immediately when touching paper in the secondary circuit. In addition, sticking of the surface of the print head 2 must be avoided. This must also be ensured if there is a long pause between individual marking processes.

Excess ink in the area of the print head 2 can flow into the ink container 5 via a channel 17 in the holder 18 for the print head.

As an alternative to this and not shown, an axial access can also be provided in the printhead 2 for the supply of the marking ink, the printhead 2 being made of a porous, permeable material and the ink being ordered by the rotational movement of the printhead 2.

In very general terms, the print head 2 can be moved or pivoted from the rest position R into the marking position M by a pneumatic, electromotive or electromagnetic device 3, wherein a sensor system 12 can be provided to trigger the automatic marking process. The sensor system 12 must be suitable for detecting production and / or quality defects in the material web 1. Trigger sizes for the marking device in paper production can e.g. There may be deviations in grammage and moisture, large or small holes, light or dark spots and tears in the edges.

In the embodiment variant shown, the print head 2 together with the drive device 9, the containers 5, 7 for at least one marking ink and the device for supplying the marking ink c are designed as a compact unit which is provided on a piston drive 13, 14 for the distance a slidably mounted folding 15 is mounted. The electronic control 16 detects the signals of the sensor system 12 or manually entered control commands and forwards corresponding control commands to the drive motor 9 and the piston drive 13, 14.

According to an embodiment variant, not shown, a plurality of print heads 2 which can be acted upon with different marking colors can also be provided, which can be controlled individually. With such a device for different production or. Quality defects markings of different colors can be applied. In addition to the automatic control via the sensor device 12, the marking process can also be triggered manually by the operating personnel.

The print head can be accelerated very quickly to the paper speed or the speed of the material web 1 and can be moved from the rest position R to the marking position M within 100 ms. Furthermore, a system for tracking the paper edge can be provided, by means of which the print head is always kept at a constant distance from the paper edge. The lateral marking of the material web reduces the ink consumption compared to conventional systems to approx. 10%. Since no spray air and no thinner are required for the paint, the material and energy saving potential is also great.

Claims

PATENT CLAIMS

1. Device for marking a thin, continuously moving material web (1), preferably a paper web, characterized in that a rotatably mounted print head (2) is provided for applying a marking ink to the material web (1), which by means of a Automatically or manually operable device (3) from a rest position (R) at a short distance from the material web (1) in a marking position (M) in contact with a lateral edge (4) of the material web (1) is movable, and that further one Device (5, 6, 7) for supplying the marking paint to the printing head (2) is provided.

2. The device according to claim 1, characterized in that the print head (2) is designed as a cylindrical disk and has an axis of rotation (2 ') perpendicular to the plane of the material web (1), one on the print head (2). acting drive device (9) is provided, which accelerates the print head (2) even before contact with the lateral edge (4) of the material web (1) to a speed matched to the speed of the material web (1).

3. arrangement according to claim 1 or 2, characterized in that the pressure head (2) consists of a porous material and the supply of the marking ink starting from a paint container (5) with a constant fill level via a capillary suction path (6), preferably colored felt, on the outer circumference of the print head (2).

4. Apparatus according to claim 1 or 2, characterized in that the pressure head (2) consists of a porous, color-permeable material, wherein an axial access in the pressure head (2) is provided for the supply of the marking paint.

5. Device according to one of claims 1 to 4, characterized in that the print head (2) by a pneumatic, electromotive or electromagnetic device (3) from the rest position (R) in the marking position (M) is displaceable or pivotable, one Sensor system (12) is provided for triggering the automatic marking process, which sensor system (12) is suitable for detecting production and / or quality defects in the material web (1).

6. Device according to one of claims 1 to 5, characterized in that a plurality of print heads (2) which can be acted upon with different marking colors are provided, which can be individually actuated.

7. Device according to one of claims 1 to 6, characterized in that the pressure head (2) together with the drive device (9), the container (5, 7) for at least one marking paint and the device (6) for supplying the marking paint a compact unit form, which is mounted on a with a piston drive (13, 14), displaceably mounted Haltemng (15).