BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1 to 8 illustrate devices of exemplary embodiments of the present invention.
DETAILED DESCRIPTION
Device 100 illustrated in FIG. 1 includes an applicator roll 1 whose working circumference 2 dips into liquor 4 over angular length 3, the liquor being located in a reservoir 5. Applicator roll 1 is coupled to a rotary drive device 6, which puts it into rotation in the direction of arrow P. While working circumference 2 of applicator roll 1 passes through the reservoir, liquor 4 is scooped up and is thus transported to a fabric web W that advances in the direction of arrow Q, which is brought to lie against working circumference 2 by two guide rolls U in angular range 7.
Device 100 also includes a doctor blade system 8, which is made up of two doctor blade rows 9, 10 optionally acting at different places of working circumference 2. In the longitudinal direction of applicator roll 1, each doctor blade row 9, 10 is subdivided into a plurality of individual doctor blades having a width of, for example, 10 mm. The individual doctor blades are able to be displaced independently of one another between a setting in which liquor 4 scooped up by the working circumference is removed (illustrated as a solid line in the drawing) and a position in which fluid removal is not effected (illustrated as a dashed line in the drawing).
In order to achieve a certain stripe pattern on fabric web W, the individual doctor blades are brought to lie against working circumference 2 on applicator roll 1 as needed, or moved away from it. Thus, a stripe pattern may be produced in a screening of 10 mm.
FIG. 2 illustrates a device 200 according to an example embodiment of the present invention. It is described only as to its differences from device 100 described with reference to FIG. 1.
In device 200, instead of doctor blade system 8, a blower system 11 is provided which includes a row of nozzles that extends in the longitudinal direction of applicator roll 1. Each row of nozzles may optionally have applied to it a gaseous medium that is under pressure, e.g., compressed air. The row of nozzles is aligned with working circumference 2 of applicator roll 1 such that gas flowing out of a nozzle, under pressure, removes from working circumference 2 liquor 4, located on working circumference 2 of applicator roll 1, in the area where the gas stream impinges, and consequently, in this area no liquor reaches fabric web W. Because the individual nozzles are able, independently of one another, optionally to have applied to them gaseous media that are under pressure, using the resolution of the effective area of one nozzle, any desired stripe patterns are able to be generated on the fabric web.
In the exemplary embodiments of the devices 300 to 700 illustrated in FIGS. 3 to 8, excess fluid that is already located on the applicator roll is not removed again section by section by suitable devices, but rather the liquor is only applied at those places where it is required for producing the liquor stripes on the fabric web.
To do this, device 300 illustrated in FIG. 3 has an application nozzle system 12, which includes a row of application nozzles 13 extending in the longitudinal direction of applicator roll 1, which are, independently of one another, optionally able to have liquor applied to them such that they then release the liquor onto applicator roll 1, according to their effective width.
In this device, working circumference 2 of applicator roll 1 does not run through a liquor bath, but underneath applicator roll 1 there is a catch reservoir 14, starting from which excess liquor is able to be supplied to a circulating system, for example, as is indicated by arrow R.
In device 400 illustrated in FIG. 4, the application of the liquor onto applicator roll 1 also takes place sectionally. However, in this example, individual nozzles do not have liquor applied to them, but rather, the liquor runs over a release device 15 extending over the entire length of the applicator roll onto a rocker system 16, which includes a row of individual rockers 17 that extend in the longitudinal direction of applicator roll 1. These individual rockers, whose width may amount to, e.g., 10 mm, may be swiveled between the position indicated by a solid line in FIG. 4, in which the liquor supplied by release device 15 is released to the working circumference at applicator roll 1, and a position indicated by a dashed line in FIG. 4, in which the released liquor directly reaches catch reservoir 14.
In device 500 illustrated in FIG. 5, the sectional supplying of the liquor takes place in that a release device includes a row of individual, flexible hoses 17 that extend in the longitudinal direction of applicator roll 1, which are displaced between the application position, indicated by dashed lines in FIG. 5, in which the liquor is supplied to working circumference 2 of applicator roll 1, and the position indicated by a solid line in FIG. 5, in which the liquor goes directly into catch reservoir 14, as is also indicated by arrow T. In order to avoid that undesired liquor reaches working circumference 2 of applicator roll 1 in the position of hose 17 indicated by the solid line, a baffle plate 18 is provided in catch reservoir 14.
In device 600 illustrated in FIG. 6, a liquor bath is again used. However, applicator roll 1 does not dip into it, but rather a series of screen rolls 19 do, which, for example, may have an effective width of, e.g., 10 mm. Screen rolls 19 are able to be displaced, using a lever system 20 supported at location S, between the application position illustrated in FIG. 6 and a position in which the lying of screen roll 19 and working circumference 2 of applicator roll 1 does not take place.
Device 700 illustrated in FIGS. 7 and 8 includes an applicator roll 31, whose working circumference 32 dips into liquor 34 over angular length 33, and which is located in a reservoir 35, whose floor 36 runs concentrically to working circumference 32 of applicator roll 31 in the operating position illustrated in FIG. 7.
Applicator roll 31 is coupled to a rotary drive device, which puts it into rotation in the direction of arrow P. While working circumference 32 of applicator roll 31 passes through the reservoir, liquor 34 is scooped up and is thus transported to a fabric web W that advances in the direction of arrow Q, which is brought to lie against working circumference 32 by two guide rolls U in angular range 37.
Reservoirs 35, of which in FIGS. 7 and 8 only one is illustrated in schematic form in each case, are supported at the ends of a lever 38 of a rocker system 39. Rocker system 39 is able to be pivoted about a pivot axis T that extends parallel to the longitudinal axis of applicator roll 31, supported in a machine frame. The free end of the other lever 40 of rocker system 39 is coupled to a longitudinal adjuster, indicated in the drawing only by an arrow V, which may be arranged as a hydraulically operated piston/cylinder unit. Using longitudinal adjuster 41, respective reservoir 35 may be displaced, while pivoting rocker system 39, between an upper operating position, illustrated in the drawing, and a lower at-rest position in which working circumference 32 of applicator roll 31 is not in contact with liquor 34.
As indicated by double arrow Y, reservoirs 35 are able to be displaced in the direction of the longitudinal axis of applicator roll 31, in order to be able to change the stripe pattern applied to fabric web W.
Reservoirs 35 have side edges 42, 43, which, in the operating position, lie in a sealing manner against the outer circumference of applicator roll 31. In order to be able to vary the width of the stripes applied to the fabric web, using respective reservoirs 35, side edges 42, 43 are arranged at respective reservoir 35 displaceable in the direction of double arrows X
By setting the clearance of the two side edges 42, 43 and a reservoir 35 and the positioning of the reservoirs in the direction of the longitudinal axis of applicator roll 31, almost any stripe pattern may be able to be applied to an advancing fabric web W, reliably and in a simple manner.
It should be understood that fluid scooped up by the fabric web from the reservoirs may have to be replenished. In order to accomplish this, conventional devices may be provided, which record the instantaneous liquid level in the assigned reservoir, and which effect the addition of new liquor when its level drops.
Patent Application
20080034811
