DE3032401A1 - PRINTING MACHINE OF A SCREEN PRINTING MACHINE WITH CYLINDRICAL TEMPLATE - Google Patents

Description

9/5

Mathias Mitter, Falkenstr. 57, 4815 Schloß Holte

Printing unit of a screen printing machine with cylindrical

template

The invention relates to a printing unit of a screen printing machine with a cylindrical template and the application roller lying in this. -

Such printing units are known per se, for example by DE-AS 20 35 220. The application roller can be carried along by friction by the rotating template can be driven on one or both sides be. You can also use a magnetic stick or by a row of pot magnets can be fixed in their position within the template. There are applicator rollers of this type that are stored at the ends, there are application rollers of this type, which are mounted at the ends and provided with a drive and there are application rollers, so-called bar roll squeegees, which are located inside the stencil.

Essentially is in the present patent application thought of round cylindrical stencils on end rings are raised so that their central axis is precisely fixed. But there is also the option of using cylindrical stencil tapes Run stencils that run over rollers will. With this type of stencils, too, similar conditions may possibly exist under certain circumstances.

BATH ORIGINAL

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In the previously known printing units of this type with round cylindrical stencils, the application roller is located exactly below or also exactly in the stencil center or when a vertical line is felling on the stencil application line of the cylindrical stencil from the stencil center is the central axis of the application roller on this perpendicular, so that in general the central axis of the template exactly coincides with the central axis the applicator roller or the three lines The central axis of the template and the central axis of the application roller lie in one plane with the application line.

The printing process in such a printing unit, that is, the transport of the goods at a certain speed and the AbwicVelgeschwindigkext of the cylindrical template, which do not necessarily correspond to the feed speed of the goods must be caused by the elastic stencil holder Moving the template from its ideal center, whereby this offset of the stencil also has an effect on the application roller.

These are normally mounted on a fixed, albeit possibly pivotable, point or on a line The application roller can only follow the displacement of the stencil from its Iriealzentrum by bending it.

The curvature of the bending line of the central axis of the application roller lies in the direction of the fabric. One Bending of the applicator roller, especially with large working widths and small roller diameters Immediately a restless and uneven running of the application roller and thus also of the stencil. This is harmful and causes marks in the print, apart from the fact that seen across the entire working width, the print is uneven.

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In addition, there may be fluctuations in the area of the paint pool in front of the application roller, which causes paint already in the feed area to the print order line from the The stencil emerges, causing smearing on the outside of the cylindrical stencil and thus an imprecise application of paint.

The invention is therefore based on the object of this To be able to counteract harmful effects from the outset through the possibility of a stabilization of "applicator roller and stencil and to compensate for the possibility of stencil deformation.] The invention consists in the fact that the central axis of the applicator roller is displaceable plane in relation to the central axis of the template in the flow of goods. Thus it is possible to use the Application roller forward, so in the direction of the inlet Material web to move, which from the start counteracts a deformation of the template and practically one Stabilization of the template is effected by the fact that a better contact between the stencil and the substrate to be printed is guaranteed than with the position of the application

■■■ ".-. - roller in normal position.

If the application roller is moved backwards, i.e. in the opposite direction to the feed of the material web, it fits the application roller is subject to the shifting effect from the start the stencil and enables a better run and a more even print.

Both possibilities result in an improvement in the print job, in particular in achieving an essential more even print job across the entire working width and also in relation to the longitudinal direction of the web. It becomes a smoother run of both the stencil and the also achieved the application roller, so that the quality of the substrate to be printed and the pattern to be printed increases.

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When arranging several printing units one behind the other within a screen printing machine will also improve the repeat accuracy elevated.

Whether the operator of a printing press achieves a better effect by offsetting the application roller forward, i.e. in the direction of the infeed of the material web, or a better effect by offsetting the application roller towards the rear, i.e. in the opposite direction to the infeed of the web, is mostly only empirical can be determined and depends on the thickness of the material web, their elasticity, for example when processing pile goods or even deep-pile fabric web, from the Running speed of a machine and, if applicable, relation speed between stencil and web or printing cover, web and stencil and also, if applicable, relation speed of application roller, screen printing stencil or application roller, screen printing stencil, material web and printing blanket, if one is available.

If the application roller is mounted, it is advantageous to design these bearings in such a way that the bearings of the application roller are relocatable in relation to the position or bearing of the template axis in the goods flow plane, namely in the direction of the inlet of the material web and also in the opposite direction. -

There is another very important idea of the invention that for the degree of adjustment of the bearing or the guide means of the application roller monitoring and control means such as a scale division and the like are provided. This makes it possible to adjust the application rollers absolutely evenly when many printing units are arranged on a screen printing machine.

BATH ORIGINAL

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Exemplary embodiments of the invention are shown in the drawings. Show it:

Fig. 1 different positions of the doctor roller within a cylindrical template, schematized,

2 shows the side view of a printing unit,

Fig. 3 shows a cross section through the schematic .. see illustration a cylindrical stencil with a driven squeegee roller,

FIG. 4 shows a view in the direction of arrow IV in FIG. 3, Fig. 5 is a partial plan view of a side bearing of

Doctor roller according to the embodiment of FIG. 3,

6 shows a schematic exemplary embodiment of a magnetic doctor blade ,

FIG. 7 shows the exemplary embodiment of FIG. 6 in a diagram. .

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As can be seen from FIG. 1, there is one inside cylindrical stencil 1 an applicator roller 2 is arranged, wherein in the normal position of the cylindrical stencil 1 whose axial center line 10 lies exactly above the axial center line 20 of the applicator roller 2. As from Fig. 1 is apparent, according to the invention, the axial center line 20 of the application roller 2 is to be offset from the axial center line 10 of the template 1, either to the front, that is in the direction of the inlet of the web 3 or a pressure blanket 4, or towards the outlet side of the web 3. This offset should be precisely adjustable, so that depending on the offset of the stencil during the printing process, if they moves out of its ideal center, the application roller 2 can be advanced or set back. the Distances a or b of the offset must be precisely definable and determinable. They can be determined empirically.

In front of the applicator roller 2 there will generally be an ink wedge 5, if this space is not known per se Displacement body and the like is partially filled.

The ink supply, the monitoring of the ink wedge or the like., the speed control of the stencil and also of the application roller can be carried out with means known per se and in of any kind, as well as the speed control for the material web or an endlessly circulating one Pressure blanket or the like. ■

It is also not absolutely necessary that the template 1 the web 3 or any other product is printed from top to bottom and the web 3 or even the The goods guide can be vertical, at an angle to the vertical, it can also be guided over the template and in In this case, the application roller 2 is not at the bottom of the cylindrical template 1, but for example at the top ^ with these deviations, however, the difficulties described usually do not appear.

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The general mode of operation, however, becomes that in FIG. 1 the working method shown.

Fig. 2 shows a known printing unit in side view, wherein a side bearing head 6 can be seen, the Lifting cylinder 60, has and, for example, tie rods 61 can be connected to the opposite side bearing head 6. Only one is shown possible embodiment. In this embodiment, the template bearing ring carries a drive Ring gear 62 meshing with a drive gear 162. The drive ring gear 62 is connected via a bearing sleeve to the template in which the applicator roller 2 which in turn is mounted in a yoke 63. As already, lies on both sides of the printing unit mentioned, such a side bearing head 6 with an external yoke 63 in which the axle or axle stub 21 the application roller 2 is mounted. This yoke becomes 63 via screws and nuts 64 and 164 on side platforms 65 held, after loosening the nuts 164 a Displacement of the yoke 63 in the indicated arrow directions is made possible because the yoke 63 has elongated holes 163 through it. The possibility of shifting and guiding the parts to one another is variable. It is possible to provide the yoke 63 with a lower toothing 263 and a toothing 263 Assigning adjusting wheel 363, which has a scale division, so that the position of the yoke 63 or any other part can be read by the user of the machine is. Other monitoring and control means for the degree of adjustment are also conceivable and possible, for example a scale at the bottom of the yoke .63 with opposite scale on a side platform 65. This is just one possible example. -. "·. ■ -

.BAD ORIGINAL

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The formation of the side bearing head and a machine frame 7 (the storage of the cylindrical or round cylindrical template 1) is depending on the construction of the ^! Machine look different.

In the embodiment of FIGS. 3 to -5 is schematic another constructive solution presented. On the machine frame 7, a counter pressure beam 8 is mounted here, which, however, also by a counter pressure roller or the like. can be replaced. A pressure blanket 4 or the like runs over this again. and on it rests a web 3, which is shown as pile fabric. The cylindrical template 1 is also only shown schematically with its end rings 11, which in this schematic representation also at the same time the bearing rings are to the template in a, for example, upwardly open bearing as a side bearing 6 each to lead on both sides and, if necessary, to tension in a manner known per se. How now the side bearings 6 are made, remains indifferent.

3, 4 and 5 now show the possibility of the axis 21 of the applicator roller 2 in an adjustable manner To store bearings 22 which are provided with bearing blocks 122 which can be moved up and down and the roller bearing 222 the axis 21 each record, is supported by the applicator roller 2 adjustable in height, depending on the setting of the Screws 26. Other vertical guides can be provided will.

The bearings 22 can be moved and through by rotating a spindle 24 in the indicated arrow directions Tighten screws 28. The screws 28 and the adjusting screw 26 each lie in elongated holes in the bearings 22.

With the adjusting screws 26 each the lowest position of the applicator roller 2 can be secured, which in general but lies with its entire own weight in the interior of the template 1, on the web 3. Um

BAD CRfGiNAL

To enable the vertical adjustment of the jewels 122, the jewels 122 lie in vertical guides 25 or form guided tours 25 *

As already mentioned, the structural design of the subject matter of the invention vary many times. In the illustrated embodiment of FIGS and 5 "is a simple one by rotating the spindle 24. Adjustment of the bearings 22 of the applicator roller 2 allows without the bearings 6 for the round cylindrical template have to be moved somehow. Fig. 2 thus shows a mounting of the axle 21 or the axle stub of the application roller 2 on the side bearing heads 6 or in the figure only one head is shown, while FIGS. 3, 4 and FIG. 5 shows the independent mounting of the axle 21 of the applicator roller 2. The bearing 22 is each a support frame 29 assigned to which the spindle 24 is set in each case can be. A scale can also be used in this area as shown in FIG. Depending on the rotation of the spindle 24, the adjustment of the central axis can then the applicator roller 2 in relation to the central axis of the cylindrical template 1 can be read.

In Fig. 6, the mounting of an application roller 2 is shown, which is designed as a magnetic roller doctor. Underneath the web lead-through level 30, which is shown in phantom in FIG. 6, there is an electric or permanent magnet 9, which on the one hand can act as a counter-pressure bar, but which also only has the task of the application roller 2, which is designed as a magnetic roller squeegee . and can be a simple round metal rod to tighten firmly. As the stencil runs in the indicated direction of the arrow, the application roller , which is not separately supported, is pressed firmly against the cylindrical stencil Ί by the action of the magnet 9 and can thus fulfill its squeegee effect - by the material from the ink wedge 5 through the template through to the goods

BATH ORIGINAL

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or material web is pressed on. There is now the possibility of moving the central axis 20 of the applicator roller 2 in relation to the central axis 10 of the cylindrical template 1 in the goods running plane by adjusting the electric or permanent magnet 9 in the direction of arrow A, either to the inlet side 31 or to the outlet side 32. Since, however, in general, the electric or permanent magnet 9 or a corresponding bar also has the task of keeping the stencil in its lower support line, which gives the print job, there is the possibility of using the application roller designed as a magnetic roller squeegee to create a cage or wall 3 22 to be arranged, which pushes the magnetic roller squeegee out of the central axis 90 of the Elektrood.Permanentmagneten 9 and holds it and thus also from the central axis 10 of the cylindrical template 1. In exceptional cases, both can happen, namely the displacement of the electro or permanent magnet 9 and also the Cage or the wall 322, <3i _{e can be} a vertical wall.

In Fig. 7 is the design of the application roller 2 as Magnetic doctor blade shown again in the diagram and also shows how electromagnets are arranged in a bar 91 as magnet pots 92, which lie in series with one another and the application roller 2, which is designed as a magnetic roller squeegee, its secure position above the central axis 90, which is attracted by the pots 92 can be.

Here, the cage 322 is shown again with end bearing pieces 322 ', which can be arranged, for example, in a yoke of a rare bearing head 6 according to FIG can or also in jewels 122 according to FIGS. 3.4 or in other Vers tell agem.

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It is not absolutely necessary for the cage 322 to be U-shaped throughout. It is essential that the free Friction movement, namely the rotary movement of the application roller 2, which is designed as a magnetic roller squeegee, is guaranteed with as little friction as possible. There is therefore the possibility of only one wall here to put in front or in the back one of the shown replaced vertical legs of the cage 322 and which with their bearing parts according to the bearing parts 322 ' of the cage 322 to the outside of the template area extends out and attacked here by adjusting means can be. . , -;

How now the color gets into the stencil, for example through a paint supply pipe 50 or the like. according to Fig. 2 and Fig. 6 remain open, there is also the Possibility of other color feeds or the like. to choose..

The idea of the invention is not for the order of Color limited. Is in the foregoing of ^ color'Vdie Speech, any other medium to be applied can be used find, for example, shine, powder, Etchants, colored pastes and colored liquids of all kinds.

The offset of the central axis of the application roller 2 in relation to the central axis 10 of the template in the goods flow plane in the dimensions a and b of Fig..1 can only a few Millimeters, tenths of a millimeter or in the centimeter range The offset could take place 1 - 3 cm. The offset must not be as strong as the. Template 1 is designed as a cylindrical template, preferably as a round template isti:

BATH

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As can be seen from the foregoing, the inventive concept is not limited to the exemplary embodiments shown. The guide means 322, the "

Cage or the wall with the bearing parts 322 'can, for example, also by a roller arrangement and the like. be replaced, but with Ro11enanierungen such must be designed so that no grooves or depressions are pressed into the applicator roller 2. It is important that the template in the area - the calm - rungskante is fixed immediately with the substrate if possible and not only deformed by the substrate will. It is also important that the application roller, if possible, with its own weight on the inner shell the template rests and thus on the goods and exerts a uniform pressure and the counter-pressure beam 8 and the like with regard to their possible deflection. or the electric or permanent magnet strip 9 adapts.

The displacement of the applicator roller 2 forwards and backwards goes through the usual position directly under the central axis 10 of the template. This position is thus also possible. The shift should be stepless. '"' ■.

In addition, it is important that the bearing and / or adjustment means for the application roller outside the stencil area lie, preferably even outside on or outside of the template heads or side bearing heads.

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Claims (20)

Patent attorneys, * / - 'Dr.O. Loesenbeck ^ * -:: *. I "" '· !! ■■ ·: "*: rv ι ι Cl ·. * ■■■: ■: *:.:; **; ::;. Mitter üipl. -lng. btracke · - ^ - - <".. * · .. · 3G3240 Dipl.-Ing. Loesenbeck 48 Bielefeld, Herford Strafje 17 9/5 Patent a ή. sayings-. 1.] Printing unit of a Siebciruckmäschine with a cylindrical Template and in this lying application roller, because ■ - d u rc h ge k e η η ze ic h η et that the central axis (20) of the application roller (2) 'can be displaced in relation to the central axis (10) of the template (1) in the plane of movement of the goods. 2. Printing unit of a screen printing machine with cylindrical Template and in this lying, end stored Application roller, characterized in that the bearings (22, 63) of the application roller (2) in relation to the position of the Template axis are displaceable in the goods flow level. 3. Printing unit according to claim 1, characterized in that the bearings (63) of the application roller (2) on the side bearing heads (6) the cylindrical template (1) is slidably attached. 4. Printing unit according to claim 1 and 3, characterized in that that the axis (21) or the stub axle of the application roller (2) each in a yoke serving as a bearing (63) which is adjustable in relation to the pressure level or is slidably attached to the side bearing head (6). 5. Printing unit according to claim 1 and 4, characterized in that that each yoke (63) is equipped with elongated holes and can be fixed in the respective position by screws (64) and / or nuts (164). ORIGINAL INSPECTED 6. Printing unit according to claim 5, characterized in that the bearing (63 or 22) with a toothing (263) is provided, to which a graduated dial (363) is assigned. 7. Printing unit according to claim 1 and one of the following Claims, characterized in that the application roller (2) free of the side bearing heads (6) on the. Machine frame (7) is mounted, each of the bearings (22) in the printing plane in relation to the template (1) is adjustable. 8. Printing unit according to claim 1 and one of the following Claims, characterized in that the bearing (22) has a bearing block (122) lying in guides. receives, in which roller or ball bearings (222) or the like. the axle (21) or the axle ends of the application roller (2) are stored. 9. Printing unit according to claim 8, characterized in that the bearings (22) or, bearing blocks (122) are adjustable in height, 10. Printing unit according to claim 8, characterized in that the bearings (22) each have a spindle (24) in the Pressure level are adjustable. 11. Printing unit according to claim 1, characterized in that the bearings of the applicator roller (2) in relation to the axial The center line (10) of the template (1) can be adjusted forwards and backwards in the printing plane. 12. Printing unit according to claim 1, characterized in that the bearings (22, 63) of the application roller (2) in relation to the location of the; Template axis in the material flow plane or printing plane are relocatable, adjustable and lockable. BAD ORIGINAL Mitt he 303240 - 3 - 13. Printing unit according to claim 1 and one of the following Claims, characterized in that when training the application roller (2) as a magnet rp.l! squeegee: guidance smit tel for these, such as cage or wall (322) are provided, which are slidably or displaceably stored in the goods flow level are. ;. -.-.- 14. Printing unit according to Ansprucjh 13 ,. characterized, that the electric or permanent magnet strip (9) under the application roller (2) designed as a magnetic roller squeegee is mounted displaceably or displaceably for displacing the central axis (20) of the application roller (2) in relation to each other to the central axis (1.0) of the cylindrical template (1). 15. Printing unit according to claim 1 and one of the following Claims, characterized in that for the degree of Adjustment of the bearings (22 or 63) or the guide means (322) of the application roller (2) monitoring and Control means such as a scale graduation etc. are provided are. 16. Printing unit according to claim 1, characterized in that the central axis of the applicator roller in relation to the central axis of the template in the goods run plane to the inlet of the Web is displaceable towards. 17. Printing unit according to claim 1, characterized in that the central axis of the applicator roller (2) in relation to the central axis the template (1) opposite in the goods flow plane is displaceable to the inlet of the web. 18. Printing unit according to claim 1, characterized in that the center axis of the application roller (2) in relation to. Center axis of the template (1) in both the goods flow plane in the direction of the feed of the web as well as the The running direction of the web is displaceable. BATH ORIGINAL Witter 19. Printing unit according to claim 1 and one of the following claims, characterized in that a stepless Adjustment of the central axis (20) of the application roller (2) ' is provided in relation to the central axis (10) of the template (1) in the goods flow plane. 20. Printing unit according to claim 1 and one of the following Claims, characterized in that the central axis (20) of the application roller (2) in relation to the central axis (10 of the template (1) in the goods flow plane both to the front as well as 'dreary below', as well as being the same to the middle infinitely adjustable and lockable towards the rear is. BAD ^ OFUGINAL