EP1167206A2 - Device for controlling the edge of a web for web processing machines, especially packaging machines - Google Patents

Abstract

The edge position adjuster (6) can follow side movements of the sheet edge (16) under manual- or automatic control. A printed mark reader (18) is rigidly coupled to the edge position adjuster, as a unit. The reader automatically follows its side movements.

Description

The present invention relates to a web edge control device for film processing Machines that work in time and after precise film length measurements are controlled as described in the preamble of claim 1.

The film processing machines are used today in different sectors of the Technology applied, e.g. in the paper industry, in the packaging industry etc. Such machines often include about certain functions of the machine, such as. to cut or fold a film into sections of equal length, or one to position moving film in certain positions, etc., according to exact Control film length sections. This is very often the case with packaging machines used where preprinted foils are used, where the preprint must always appear in exactly the same place. In so-called bag packaging machines it is also about making bags of constant size or length.

The best known way of controlling such machines is to use so-called Equip print marks. When printing on the film become this Purpose on one edge of the slide marks that are mutually equidistant are attached, printed with. The location of these markings is with a print mark reader very easy to read. Such so-called film web edge control devices are known from practice and are in frequent use. However, they point a problem, namely the fact that in such, often very heavy foils processing machine - in which the material of the film is often "alive" as it is are laminates with plastics and / or metals - the foil edge itself moves laterally by relatively large distances, which the print mark reader does not more accurate to the print mark and the exact reading the situation is not guaranteed. Some designers have this as a result solved that if the intended for the determination of the edges or the edge position Sensor (or sensors) detects a shift in the edge, the whole location of the Film roll is corrected accordingly. This means that the film roll on its Rotation axis must be displaceable in the longitudinal direction of the axis and that too appropriate drive mechanisms must be available. It is about a expensive and complicated solution to the problem.

The object of the present invention is to solve the problems mentioned by the displacement of the film edge disadvantages caused a simple, cheap and propose a safe solution, which in particular relies on controlling the situation can dispense with the film roll on its axis.

This task is performed in a generic web edge control device by the Features of the marked part of claim 1 solved.

Thanks to the fact that the edge position adjustment device is a rigid unit with the Forms print mark reader, it is now sufficient to provide that the edge position adjustment device the lateral adjustments of the film edge, by hand or automatically controlled, can follow to achieve that automatically the print mark reader is always placed correctly in relation to the print mark, which always means ideal conditions are given for reading the print marks. Because the edge position adjustment device and the print mark reader are very close together and in common are moved laterally to follow the migration of the edge Adjustment of the position of the print mark without any delay compared to the detection the displacement of the edge, which however can be the case if one the determination of the peripheral position at a location, i.e. removed from the film roll Place, makes.

Fig. 1

zeigt die Erfindung in schematischer Darstellung, angewendet an einer Beutelverpackungsmaschine;

Fig. 2

ist ein Detail in vergrösserter Darstellung der Kantenlageverstellvorrichtung kombiniert mit dem Druckmarkenleser;

Fig. 3

ist eine andere Ansicht der Vorrichtung der Fig. 2, worin die Lage der Sensoren gegenüber der Folienkante noch besser zu erkennen ist.

The invention will now be described in more detail with the aid of an illustrated embodiment. The figures show:

Fig. 1

shows the invention in a schematic representation, applied to a bag packaging machine;

Fig. 2

is a detail in an enlarged view of the edge position adjusting device combined with the print mark reader;

Fig. 3

is another view of the device of Fig. 2, wherein the position of the sensors relative to the film edge can be seen even better.

In Fig. 1 is an application of the inventive device in a bag packaging machine shown. However, it should be noted immediately that this is only one of the many conceivable applications of the invention. The inventive Furniture can also be used on other production machines where a sheet of paper, plastic or metal is processed, provided that the Problem of lateral migration of the film is present and inventive Way can be solved.

In Fig. 1 you can see, referred to in the transport direction of the packaging film, with 1 the film roll, with 2 a film storage made of dancer arms, with 3 a Foil conveyor pair 3 formed from two rollers 4 and 5. Foil conveyor pair 3 delivers measured film sections and is used by the inventive web edge control device controlled. It is driven with a servo motor, not shown.

With 6 an edge position adjustment device is designated, which later to be described in more detail. 7, 7 'and 7 "are pulleys around which the Film is deflected. The film then runs on a so-called format shoulder 8, which converts the flat film 9 into a tube. The film tube is over pulled a format tube 10, where he with two pairs of film straps 11 (only one visible in Fig. 1) is drawn along the tube 10. The belts 11 are with servo motors 12 driven (also only one visible), it should be noted that the motors 12, preferably after a parallel application by the same applicant Torque-controlled servomotors, which are therefore always under the film 9 Maintain tension without interfering directly with the control of the film transport. The controlled transport of the film 9 takes place via the one not shown Servo motor of the feed roller 4.

With 13 and 13 'the so-called cross-locking device is also designated, which has the task of the hose after it has passed through the funnel 14 with the Filling product was filled and by the longitudinal closure device, not shown was closed with a longitudinal seam for its closure, as a finished bag to seal and separate from the hose. A is used for the separation operation Knife 15.

From this representation of a classic application of the inventive device a problem with the known solution of the prior art can be solved immediately detect. If namely the determination of the position of the film web as close as possible on the form shoulder 8 must be carried out to be sure that the slide 9 can later move as little as possible laterally, but the correction the lateral position must already be carried out with the position of the film roll 1, so one sees immediately that between the roller 1 and the edge position adjusting device 6 (which is part of the web edge control device 6) cover a considerable distance is so that the correction of the film position always with a certain delay, given by the length of the route between the location and the measurement location. This disadvantage is eliminated by the present invention.

In order to explain the invention in more detail, FIGS. 2 and 3 must now be used. In these figures, the web edge control device is in its structural details shown, it should be noted that in Fig. 3 the device, from purely illustrative Reasons shown in the opened position opposite the film web 9 is.

2 and 3, the film edge is shown at 16. At the edge 16 there are printing marks 17 attached to each other at regular intervals. At 18 is a print mark reader which in any way, e.g. optically with colored brands or capacitive with magnetic signs etc., the mark 17 can determine. At 19 and 20 two sensors are designated, which with corresponding elements, preferably optical elements (but other elements are also conceivable) on the Presence - namely sensor 19 - or the absence - namely sensor 20-der Film web 9 react.

The invention is now characterized in that the edge position adjustment device 6 can follow the lateral displacement of the film web 16, this function of By hand, e.g. a handwheel, as will be explained later, or automatically, by means of a separate servo motor, and that the print mark reader 18 rigidly coupled to a unit with the edge position adjustment device 6 is. This means that the print mark reader 18 is always opposite the film edge 16 is automatically placed correctly and is therefore always able to print mark 17 reliably determine and trigger the corresponding function of the machine. For this purpose, it is sufficient to provide that the print mark reader 18 with the Edge position adjustment device 6 is always rigidly coupled and that the edge position adjustment device can follow the lateral displacement of the film edge 16. The film roll 1 can in principle assume any lateral position and also the width tolerances the slide doesn't matter.

According to a first embodiment variant of the invention, it is provided that the Edge position adjustment device 6 and the print mark reader 18 on a common, carrier 21, which is laterally adjustable and displaceable relative to the film edge 16 are fixed. The carrier 21 can e.g. the shape of an adjustable and removable plate exhibit.

According to a further preferred embodiment variant of the invention, that the one carrying the edge position adjustment device 6 and the print mark reader 18 Carrier 21 is equipped with a threaded spindle 22, which is equipped with a handwheel 23 can be operated in the sense of a displacement of the carrier 21 in a lateral direction, or in the opposite direction, opposite the film edge 16. This is natural the simplest and cheapest way of controlling the web edge control device, has the disadvantage, however, that the staff regularly remove the film edge must control what requires a relatively high level of reliability on the part of the staff.

According to a further preferred embodiment variant of the invention, it is provided that that an acoustic or optical signal transmitter (not shown in the figures) is present is which receives signals from the edge position adjusting device 6 and accordingly responding. This measure is generally intended to help staff.

According to a further preferred variant of the invention, it is provided that the lateral displacement of the film edge 16 outside a certain tolerance limit by one of the two sensors 19, 20 of the edge position adjusting device 6 is determined and that subsequently an appropriate acoustic for the staff or optical signal is triggered by the signal generator. This solution is also a simple variant of the invention, which the constant presence of the operating personnel conditionally. But it has the advantage of simplicity and a price advantage compared to other solutions.

In contrast, according to a further preferred variant of the invention, it is provided that the adjustment of the position of the edge position adjusting device 6 and the print mark reader 18 automatically follow the lateral migration of the film edge. To for this purpose it is provided that the carrier 21 with a - in the figures not shown - motorized drive for its displacement in a lateral direction or is equipped in the opposite direction to the film edge and that the drive automatically for a movement in or out through the edge position adjustment device is controlled. The advantages of this version are obvious: they allow the facility to operate fully automatically.

According to a further preferred variant of the invention it is further provided that the Sensors 19 and 20 of the edge position adjustment device 6 in the transverse direction of the film web have a mutual distance a (see FIG. 3) of 0.5 ÷ 2 mm, preferably 1 mm. Experience has shown that this results in sufficient path control precision.

According to a further variant of the invention, it is provided that the web edge control device to be applied to a bag packaging machine. The machine contains a pair of feed rollers 3, one from format shoulder 8, Format tube 10 and film take-off belt 11 formed format part, as well as a cutting apparatus 14 for separating the film web 9 after the formation and filling of the Bag. With such a machine, it has proven to be particularly advantageous if that formed from the edge position adjustment device 6 and from the print mark reader 18 Unit to lie between the feed roller pair 3 and the format shoulder 8 comes. This arrangement of the elements allows the best control ratios via the film edge position and thus a reliable control of the position of the film to ensure the print mark.

It has also proven to be advantageous if, when used in a bag packaging machine the length of the film between the print mark reader 18 and the Cutting device 15 a multiple of the film length b (see Fig. 3) between two following print marks 17. In Fig. 1 e.g. the route mentioned three times as large as the distance b between two print marks 17. This condition allows to create optimal design conditions for bag packaging machines.

Figure designation

1

film roll

2

film storage

3

Sheet conveyor pair

4

supply roll

5

pressure roller

6

Kantenlageverstellvorrichtung

7, 7 ', 7 "

guide rollers

8th

format shoulder

9

foil

10

forming tube

11

Film pulling belt pair

12

engine

13

13 'cross locking device

14

funnel

15

knife

16

Foil edge or foil edge

17

print mark

18

Print Mark

19

sensor

20

sensor

21

carrier

22

screw

23

handwheel

Claims (9)

Web edge control device for film web processing machines, which work in time and are controlled according to precise film length measurements, in particular for packaging machines such as bag packaging machines and the like, with a film which bears print marks (17) on at least one of its edges (16) which are read by means of a print mark reader ( 18) are determined, thereby controlling a specific function of the machine and with an edge position adjusting device (6) containing two sensors (19, 20), which can determine the lateral position of the edge (16) provided with printing marks (17) .
characterized in that
the edge position adjustment device (6) can follow the lateral displacement of the film edge (16), manually or automatically controlled, and that the print mark reader (18) is rigidly coupled to the edge position adjustment device (6) so that it automatically follows the lateral displacement thereof , Web edge control device according to claim 1,
characterized in that
the edge position adjustment device (6) and the print mark reader (18) are fixed on a common support (21) which can be adjusted laterally towards and away from the film edge (16). Web edge control device according to claim 1,
characterized in that
the carrier (21) is equipped with a threaded spindle (22) which can be operated with the aid of a handwheel (23) in the sense of a displacement of the carrier (21) in a lateral direction or in the opposite direction with respect to the film web edge (16). Web edge control device according to claim 3,
characterized in that
there is also an acoustic or optical signal transmitter which receives signals from the edge position adjustment device (6) and reacts accordingly. Web edge control device according to claim 3,
characterized in that
the lateral displacement of the film edge (16) beyond a certain tolerance limit is determined by one of the two sensors (19, 20) and that a corresponding acoustic or optical signal is subsequently triggered by the signal transmitter for the operating personnel. Web edge control device according to claim 2,
characterized in that
the carrier (21) is equipped with a motorized drive for its displacement in a lateral direction or in the opposite direction with respect to the film edge (16) and that the movement of the drive towards or away is controlled by the web edge control device. Web edge control device according to claim 1,
characterized in that
the sensors (19, 20) of the edge position adjusting device (6) in the transverse direction of the film web (9) are at a mutual distance of 0.5-2 mm, preferably 1 mm. Use of the web edge control device according to claim 1 in a bag packaging machine, with a pair of feed rollers (3), a format part formed from format shoulder (8), format tube (10) and film take-off belt (11) and with a cutting device (14) for separating the film web (9) the formation and filling of the bag,
characterized in that
the unit formed by the edge position adjustment device (6) and the print mark reader (18) is located between the pair of feed rollers (3) and the format shoulder (8). Use of the web edge control device according to claim 8
characterized in that
the film length between the print mark reader (18) and the cutting device (15) is a multiple of the film length (b) between two subsequent print marks (17).

Images