DE1786113A1 - Device for treating, in particular for printing flat material - Google Patents

Description

1736113

August 19, 1968

Dipl .. ing "Robert Sans' Waiter" in Innstouck (Austria)

Device for treating, in particular for printing flat material

The invention relates to a device for treating, in particular for printing flat material, which is between two against each other a pressure-exerting working parts is moved, whereby one of the working parts, in particular, the printing pad of a printing block is a magnetic body which consists of a number of electromagnets whose magnetic cores in one or more rows and preferably with perpendicular to the treated sheet-like material standing axes are arranged, the magnetic cores in a sheet-like material to be treated facing, if necessary protrude through a thin cover, stable support body.

Such a device is, for example, in rotary stencil printing machines become known, the arranged inside each cylinder template

13105 "; ■■■■ 4 / mo35

-2 - ■

Roll or brush squeegee consists of magnetizable material and is attracted by the magnetic body arranged in the printing substrate. ■ - ■■ - ■ -

The during operation of the individual electromagnets of the magnetic body inevitable heat development has the consequence that the magnetic cores a certain Experience longitudinal expansion, whereby the pole faces from the stable support body of the Stand out for the printing material. The originally smooth surface of the P printing pad disturbed, even if it is above the stable support surface

and a thin cover, e.g. a sliding plate, is arranged on the magnetic cores. By the longitudinal expansion of the magnetic cores causes the thin shell to bulge. the Another consequence of the magnetic cores protruding above the surface of the stable support body or the bulges of the shell are strip-like irregularities during printing, in which the material to be printed is slightly more between the magnetic cores Absorbs color than in the more strongly pressed areas above the magnetic cores.

According to the invention, this deficiency is remedied by the fact that the stable "Support body a recess or

Has opening, in the area of which the pole faces of the magnetic cores are spaced apart end from the surface of the support body facing the material to be treated.

In this way, the pole faces of the magnetic cores are spaced apart by the print zone of the material to be printed on. In this area, length, Play changes to the magnetic cores that do not show any adverse effects. Provide the necessary firm support for the material to be treated in the pressure zone

2098H / ÖÖ38

dfee Öei-eiichö dss SfiifeyrpefSi which is the direction of the flow to be treated Material in front of and behind the recess or opening in the stuffer body.

Mini change almost equivalent possibility to remedy the deficiency shown «* According to the invention, it is based on the material to be treated facing surfaces of the stable support body are made of corrtpressiblem and at least to a certain extent elastic material, solid aggregate - Standes wgeetdnef tsh |

In this way, too, the pole surfaces of the magnetic core are kept at a distance from the print zone of the material to be printed. In this area Löngehänderunäett can play the magnetic cores, soft, no adverse Wirkun- §mmi§m _f well the compressible material of the bearing can aüfzüHehlTien this Längenänderüngen in itself Nevertheless, the material to be treated in the Druckzöhe a sufficiently firm support experiences because the compressible The substance of the overlay has a solid state of aggregation,

Bt§ Ürfihdung is explained in more detail with reference to the drawings, without it evil shrinks to söitti

Ptg * 1 clearly shows a stencil location station of a rotary stencil printing machine,

Ng ^ 2 the printing material of the stencil station (without sliding plate) and 3 shows a section through the template station (according to A-B of FIG. 2).

Fig. 4 shows an analogous sectional view of a variant of the embodiment 1 to 3. Another Ausführungsbeispiei of the invention is

2-09814 / 0039

illustrated by Figures 5-7.

5 shows a diagrammatic view of a stencil station of a rotary stencil printing machine /

6 shows the printing base of the stencil station (without sliding plate) and FIG. 7 shows a section through the stencil station (according to A'-B ¹ of FIG. 6).

Fig. 8 shows an analogous sectional view of an embodiment variant of the Embodiment according to FIGS. 5 to 7.

In the embodiment according to FIGS. 1 to 3, inside the stencil cylinder 1 of a rotary stencil printing machine, a roll doctor blade 2 is made of magnetizable)! Material, for example made of steel, which on the one hand presses the stencil cylinder 1 onto the material 3 to be printed and conveys the printing ink through the screen openings of the stencil cylinder 1 onto the material 3 to be printed as it rolls off the inner wall of the stencil. The sheet-like printable Ma * ⁴ TERIAL 3, for example, a textile web is transported by a printing blanket. 4

ψ Under the blanket 4, opposite the stencil cylinder 1, the print «

Underlay a magnetic bar is arranged, from which the roller doctor 2 is attracted and which consists of a series of electromagnets 5, the cylindrical magnet of which Cores 6 protrude into a stable support body 7. The support body 7 is of a thin one Sliding plate 8 covered. The web 3 with the printing blanket 4 rests on it.

Along the row of magnet cores 6 of electromagnets 5, the support body a groove 9. In the base of the groove 9, the magnetic cores 6 end with their;

2Ö9SfH / 0038

Pole faces 10. The latter therefore have a distance from the surface of the support body 7 / which enables harmless movement of the magnetic cores 6 as a result of heating when current flows through the windings of the electromagnets 5. Even if the pouches 10 protrude from the base of the groove 9, the sliding plate 8 and the printing blanket 4 moved over the sliding plate 8 remain smooth Uniform width, so that the printing process avoids damaging stripes. In addition, the guide plate Bin can resiliently bend the free space formed by the groove 9, which means that the rigid, hard rocket 2 defies the otherwise hard impact a soft elastic adaptation occurs, which affects the print quality

tioi "remains essentially the same" if the slip · * bJestt i was missing In this; Trap the D ^ cfetueh 4 directly into the through the groove 9

. _v This Raul "krnm owpcH a material firmer Aggreg <iteiistandes; _f mm k ^ mpesjibjem; wml «Ädetteos; rock twelfth certain Qtofkt - elastic I.

fz, i "IFttz> ila ^ tQiiereii Seb""fistQiffe) from filled sfeitu Dlem Miterictl kwmmmhmk Kmmfemmhvfettfevm§ W ^ kfettieü consists of" m4 "Ehr korrosicms",. ■ '

ttoeuseite the »

presses onto the material 3 to be printed and during the unwinding on the > ^y 'inner wall of the stencil, the printing ink is conveyed through the screen openings of the stencil * ⁴ cylinder 1 onto the material 3 to be printed. The * material 3 to be printed is transported by a printing blanket 4. - *

According to FIG. 4, the printing substrate has the shape of a roller, the casing 8 ^{1 of} which rotates around a stationary carrier. Like the magnetic bar according to FIGS. 1 to 3, this carrier has a number of electromagnets 5 with magnetic cores 6. Here, too, the magnetic cores protrude into a stable support body 7 *,

however, its surface is cylindrical in shape. Also as in FIGS. 1 to 3 the support body 7 * has a groove, in the base area of which the magnet cores 6 end with their poly areas IO. With regard to the function of this groove, refer to the Reference is made to the relevant explanations of the description of FIGS. 1 to 3.

In the embodiment according to FIGS. S to 7, inside the stencil cylinder I of a rotary stencil printing machine, a roller doctor blade 2 made of magnetisable material, for example steel, is arranged, which on the one hand presses the stencil cylinder I onto the material 3 to be printed and during of unwinding

The Schabfemenrnnenwancf the printing ink through the screen openings of the Schabforten cylinder ΐ onto the material 3 to be printed, for example a textile web * is transported by a printing blanket 4.

Under the printing blanket 4, opposite the doctor blade cylinder 1, there is a print in a magnetic area on georafaef, in front of which the rotary squeegee 2 is drawn

and which consists of a series of electromagnets 5, their cylindrical magnetic cores 6 protrude into a stable support body 7. On the support body 7 is a pad 11 made of compressible and - at least to a certain extent elastic Solid aggregate substance, e.g. made of felt, elastomers, foams or the like. A thin sliding plate 8 is arranged above the support 11.

The magnetic cores arranged in a row 6 of the solenoids 5 terminate with their PoJflachen 10 in the surface of the supporting body 7. s occurs when current flow through the windings of the Eiektromagnete 5, heating of the magnetic **%

cores 6, as a result of which they experience a longitudinal expansion and protrude with their pole faces from the stable support body 7. The support 11 is compressed at the relevant points, but the sliding plate 8 and the printing blanket moved over the sliding plate 8 remain smooth. The pressure which the material 3 to be printed on experiences due to the magnetic attraction of the roller doctor blade 2 is uniform over the entire width, so that harmful streaking is avoided during the printing process. In addition, the sliding plate 8 can bend resiliently due to the elastic compressibility of the support 11, whereby despite the rigid hard g

Roll doctor 2 instead of the otherwise hard contact pressure, a soft elastic contact pressure occurs, which has a positive effect on the print quality.

The function described remains essentially the same when the sliding plate 8 is missing. In this case, the material of the support 11 must be such that that on its surface sliding of the blanket 4 is possible without interference.

The support 11 can also be used as corrosion protection for the soft iron and very corrosion-prone magnetic cores are used. As a protection against corrosion, however a corresponding coat of paint can also be applied to the pole faces.

Fig. 8 also illustrates a stencil station of a rotation « stencil printing machine. The stencil cylinder 1 contains in its interior the squeegee 2 made of magnetizable material, which on the one hand the Schab ionenzy Ii n » the 1 presses on the material to be printed 3, and during the unwinding of the Stencil inner wall the printing ink through the screen openings of the stencil cylinder 1 promotes the material to be printed 3. The material 3 to be printed is transposed from a printing blanket 4.

According to FIG. 8, the printing pad has the shape of a roller, the shell 8 ^{1 of} which rotates around a stationary carrier. Like the magnet bar according to FIGS. 5 to 7, this carrier has a row of electromagnets 5 with magnet cores 6. Here, too, the magnetic cores protrude into a stable support body 7, the surface of which, however, is cylindrical in shape. Between the stable fall body 7 * and the cover 8 * there is a support 11 * made of elastically compressible material of a solid state of aggregation. This support 11 * has the same function as the support 11 in FIGS. 5 to 7.

The illustrated and described exemplary embodiments deal with the application of the measure according to the invention on screen printing machines with round stencils. However, the invention is not restricted to this field of application.

209814/0038

The measure according to the invention can also be used, for example, with magnetic bars or Use magnetic rollers for flat stencil screen printing machines. Furthermore can the counter pressure rollers of rotary printing machines for gravure *, Hpch or flat printing advantageously have the features according to the invention, the same pressure and / or counter-pressure rollers of nip devices, calenders, etc.

209114/0038

Claims (1)

Patent claims: Device for treatment, especially for printing flat Material, which between two working parts exerting pressure against one another is moved, with one of the working parts, in particular the printing pad of a printing form body contains a magnetic body which consists of a number of electromagnets, the magnetic cores of which in one or more P ' rer rows and preferably with perpendicular to the surface to be treated Shaped material standing axes is arranged, the magnetic cores in one facing the sheet-like material to be treated, if necessary protrude covered by a thin shell, stable support body, characterized in that the stable impact body one over the series of Has magnetic cores continuous recess or opening in which Area where the palms of the magnetic cores end at a distance from the surface of the support body facing the material to be treated, " 2" device according to claim \ _f, characterized in that the stable support " body has a recess in the form of a continuous groove in which Base area the magnetic cores end with their pole faces. 3. Device according to claim 1 or 2, characterized in that in the Deepening or opening of a compressible material made of solid aggregate * state is arranged. 209814/0038 4. Device for treating, in particular for printing flat material, which is moved between two working parts exerting pressure against each other, one of the working parts, in particular the printing pad of a printing plate, containing a magnetic body which consists of a number of electromagnets Magnetic cores are arranged in one or more rows and preferably with axes perpendicular to the sheet-like material to be treated, the magnetic cores with their ends facing the sheet-like material to be treated in a ύ Stable support body protrude, characterized in that on the surface of the stable support body facing the material to be treated, a support of compressible and at least up to a certain degree elastic substance is arranged in a solid state . 5. Device according to claim 4, characterized in that the kpmpressible Support is arranged as an intermediate layer between the stable support body and a thin casing designed as a sliding sheet or rotating cylinder. $ 209814/003
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