Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F15/00—Screen printers
  • B41F15/14—Details
  • B41F15/40—Inking units
  • B41F15/42—Inking units comprising squeegees or doctors
  • B41F15/426—Inking units comprising squeegees or doctors the squeegees or doctors being magnetically attracted
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F15/00—Screen printers
  • B41F15/14—Details
  • B41F15/40—Inking units
  • B41F15/42—Inking units comprising squeegees or doctors

Definitions

• the invention relates to a device for applying, printing, impregnating, painting, coating liquid or pasty substances on flat material or for squeezing liquids out of tissues, or for smoothing, solidifying or for similar processing of flat material, by means of rollers and magnetically effected contact pressure.
• Such devices have become known in a wide variety of embodiments. In general, however, they have at least one roller-shaped or strip-shaped magnet, which attracts a magnetizable roller.
• the flat material is processed in a treatment zone in accordance with the respective requirements, the treatment zone being formed between the strip-shaped or roller-shaped magnet and the magnetically pressed roller.
• Such a device suitable for flat screen printing is described, for example, in AT-PS 206 395.
• the magnetisable roller is inserted without guidance into a flat template and is magnetically attracted by a magnetic roller arranged below the flat template and the material to be treated, which may be carried by a conveyor belt. By moving the magnetic roller along the flat template, the magnetizable roller is taken along and applies the color substance contained in the flat template to the flat material.
• a major advantage of such devices is provided in that the magnetizable roller exerts a very uniform line pressure on the flat material to be treated, even with very long lengths or working widths.
• doctor blades with very small diameters are required, which, however, can only be magnetically pressed with a limited force due to magnetic saturation.
• a laminating device is described in AT-PS 295 456, which has a strip-shaped magnet.
• This magnet consists of a number of electromagnets with north and south poles spaced apart in the direction of movement of the flat material to be treated. There are two magnetically pressed over the rows of poles
• AT-PS 333 2314 Another device with magnetically effected contact pressure is described in AT-PS 333 234. This device is used for satinizing flat material and has two magnetic, fixed rollers. The sheet material is deflected around one of these rolls and a small diameter work roll is placed in the gap formed between the rolls. However, this device is also only for the assigned purpose and not for general use.
• the invention was therefore based on the object of providing a device which is as suitable as possible for all machining or treatment operations which occur on flat material, in which the aforementioned problems are avoided and the contact pressure of the pressure-exerting rollers can be set essentially independently of their diameter. State the nature of the invention
• a magnetic bar or roller and at least two adjacent rollers arranged one above the other in the central or symmetry plane of the magnetic field running parallel to the magnetic bar or roller and an auxiliary device formed in one or more parts are arranged, which at least have the magnetic bar or roller holds or leads the most distant role in the central or symmetry plane of the magnetic field.
• At least the roller which is the most distant from the magnetic strip or roller and / or the auxiliary device consist at least partially of magnetizable material and thus form the magnetic yoke.
• the treatment zone for the sheet material is preferably formed between the magnetic strip or roller and the roller adjacent to it. If at least three rollers are arranged one above the other, it can also be provided that a treatment zone for the flat material between the roller adjacent to the magnetic strip or roller and the roller following this and optionally between the magnetic strip or Roll and the adjacent role are formed.
• the diameter of the roller adjacent to the magnetic bar or roller is smaller than that of the magnetic bar or
• Roller is the most distant role. It is easy to see that the most distant roller can then exert a very high contact pressure on the roller of smaller diameter due to its large magnetic mass.
• the auxiliary device is designed as an essentially U-shaped profile that is open toward the magnetic bar or roller. This ensures good guidance of the rollers in the plane of symmetry of the magnetic field running parallel to the magnetic bar or roller.
• the U-shaped profile advantageously encloses two rollers, the distance between the legs of the profile being approximately adapted to the diameters of the rollers.
• At least one of the rollers is gimbally connected to a drive.
• the device is used for sealing on one or both sides of an outlet gap of a container for application substance running parallel to the magnetic strip or roller against the flat material or a template.
• Fig. 1 and 2 show the schematic of doctor devices according to the prior art
• Fig. 3 shows the schematic oblique view of a device according to the invention
• Figs. 4, 5 and 6 cross sections of other embodiments
• Fig. 7 shows the example of an example Roller bearing
• Fig. 8 shows the cross section of an auxiliary device partially made of magnetizable material
• Figs. 9, 10 and 11 the side views of further variants
• Figs. 12 and 13 examples of the use of the device according to the invention for sealing hydrostatic doctor blades.
• Fig. 1 shows a doctor device according to the prior art, which consists of a magnetic strip 1 or a magnetic roller 1 'and a single application roller 2 made of magnetizable material; between which the processing zone for the flat
• Material 6 is. If either the doctor device is moved in the direction of arrow 11 or the material surface 6 to be applied is moved in the processing plane in the direction of arrow 11 'between the spatially stationary doctor device and becomes liquid or pasty in the area lying in front of the application roller 2 in the direction of movement
• Application substance 12 applied to the material surface 6, the roller 2 can move or hold in front of itself a relatively large amount of substance 12, corresponding to its relatively large diameter, and thus either cover a relatively long processing path or carry out an application process that contains a large amount of substance 12 consumed without the need to give in the order substance 12 again.
• FIG. 2 shows the same representation as in FIG. 1, with the difference that the application roll 2 has an approximately half the diameter of the application roll 2 shown in FIG. 1. Accordingly, it can only transport or consume a considerably smaller amount of ink 12. hold in front of you. Since this smaller roller 2 shown in FIG. 2, according to its cross-section, also has a considerably lower magnetizable mass, the magnetic contact force on the flat material is also 6 correspondingly lower.
• the smaller application roll 2 shown in FIG. 2 can only perform considerably less job work than the application roll 2 shown in FIG. 1 of larger diameter and correspondingly greater mass.
• the contact pressure indicated by arrow 10 is, like the amount of ink 12, approximately dependent on the size of the roll diameter in the ratio of the number of squares.
• Fig. 3 the invention is shown as a processing device of the simplest design, it must be taken into account that the arrangement except as shown - that is, with magnetic bar 1 or with magnetic roller 1 'as the base and arranged vertically above it in the plane of symmetry of the magnetic field 5' at least two rollers 2 and 3, the further spaced roller 3 being guided by an auxiliary device 4 in the plane of symmetry - also in any other direction, for example diagonally, horizontally or from top to bottom is possible.
• the reference number 5 denotes the magnetic flux in the strip 1 or roller 1 'which runs along the lines 5' to the roller 3 or to the auxiliary device 6.
• the processing device can be arranged stationary, the flat material 6 being moved between the magnetic bar 1 and the roller 2, or the flat material 6 is stationary and the processing device is moving parallel to the processing plane.
• the material surface to be processed can also be attached to an existing conveyor belt and covered by a template (which can be flat or round).
• the diameter of the roller 3 further distanced from the magnet 1, 1 ' is larger than the diameter Knife of the adjacent roller 2 and the auxiliary device 4 comprises both rollers 2 and 3 together. It is designed as a U-shaped profile 4, which is open towards the magnetic bar 1 or roller 1 ', the distance between the legs being adapted to the roller diameters.
• the rollers 2, 3 are held in the auxiliary device 4 and cannot fall out.
• a transport path 7 and a flat template 8 or, optionally, a circular template 8' are also shown in FIG. 4.
• FIGS. 3 and 4 shows an embodiment related to FIGS. 3 and 4 with the differences that in addition to the rollers 2 and 3, a further roller 9 is used, which is arranged axially parallel to the two rollers 2 and 3.
• at least the roller 9 is made of magnetizable material and is consequently pressed against the roller 3 by the action of the magnetic force field 5 'in the direction of the arrow 10, whereby, in a further continuation of the force flow, the roller 3 in the direction of the arrow 10' are pressed against the roller 2 and the roller 2 in the direction of the arrow 10 "against the magnetic strip 1 or magnetic roller 1 '.
• the U-shaped profile 4 is supplemented by two further guide strips 4' and 4".
• This embodiment of the invention results in three possible processing planes, in which the material surfaces 6, 6 'and 6 "are shown.
• the processing zone of the material 6' is - as a further difference from the arrangement examples of Figures 3 and 4 - characterized in that the diameter of the rollers 2 and 3 can be chosen arbitrarily small, preferably in the same dimension, whereby a very high, linear pressure is exerted.
• middle rollers 2 and 3 do not have to be made of magnetizable material and can therefore be produced from such material, the characteristics and surface properties of which are most favorable for the machining process.
• One of the rollers for example the most distant roller 9, can be gimbally connected to a drive 19 which does not hinder the mobility of the roller 9 in the central or symmetry plane of the magnetic field 5 '.
• the diameter of the application roller 2 shown in FIG. 6, which is adjacent to the magnet 1, 1 ', is only about a quarter as large as the diameter of the application roller 2 shown in FIG. 1.
• the diameter of the additional roller 3 used according to the invention is comparatively large corresponds approximately to the roller diameter shown in FIG. 2 - but the diameter of this roller 3 is possible in any size according to the invention - is with full magnetic saturation of the roller 3rd a contact pressure which is several times greater than that which would correspond to the mass of the application roller 2 in FIG. 6.
• the roller 3 or the roller 2 can be guided and, due to the outer shape, due to the internal shape a much larger amount of ink 12 transported or held in the space in front of the applicator than would correspond to the diameter of the roller 2 according to the prior art.
• the ink volume shown in FIG. 6 is approximately the same as the ink volume shown in FIG. 1, although the diameter of the application roller 2 shown in FIG. 6 is only about a quarter of the roller diameter shown in FIG. 1.
• the magnetizable mass of the application roller 2 shown in FIG. 6, on the other hand, is only about 1/16 of the application roller 2 shown in FIG.
• Another advantage of the invention which is very important in practice, is that an application or processing roller of relatively small diameter with the same total contact pressure still has a larger one
• Line printing can exert as a roll of larger diameter.
• This advantage comes into play in the processing zone 6 'shown in FIG. 5 to a very special extent, since, according to this special form of arrangement, two processing rollers 2 and 3 counteract work with each other, both of which have an extremely small diameter and, accordingly, can form an extremely narrow contact zone with one another.
• the numbers 8 and 8 'in FIG. 6 show that this embodiment of the device according to the invention can be used for flat or circular stencil printing in addition to direct or full-surface application.
• the at least two rollers 2 and 3 according to the invention, of which at least roller 3 is guided in the auxiliary device 4 can each be provided with an end plate 13, each of these end plates 13 having round or elongated slots 13 'and 13' 'is provided, which are suitable for receiving axle journals, which are located on the rollers 2 and 3 and serve to hold the rollers in place when the device is installed and removed in the auxiliary device 4.
• the auxiliary device 4 which is designed like an open slide bearing, can rest on the apex 14 of the roller 3, preferably along the entire length, along a line.
• FIG. 8 shows a similar embodiment of the invention as shown in FIG. 7, but with the inner surfaces serving for roller guidance being designed similarly as in FIGS. 4, 5 and 6 so that the two rollers 2 and 3 are and removal are held in the auxiliary device 4.
• the auxiliary device 4 can consist of a one-piece profile made of slidable plastic, magnetizable strips 15, 15 ', 15''being inserted in openings of this profile, on which the magnetic force field 5' acts. This will be acts that the auxiliary device 4 acts on the apex 14 of the roller 3 and thus also on the roller 2.
• the idea of the invention thus allows the possibility that both the roller 3 and possibly also other rollers arranged in the same principle - as well as the auxiliary device 4, can consist of magnetizable or at least partially magnetizable material.
• FIG. 8 also shows that the auxiliary device 4 has been given the additional function of forming a liquid retention gap 16 on the side facing the template or processing surface.
• the underside of the auxiliary device 4 which forms this storage gap and which is designed as a continuous profiled strip causes an increase in the application quantity, provided the material to be processed has a corresponding absorption capacity.
• the arrow 17 - 17 ' shows that the auxiliary. Device as shown in the example of FIG. 8, about the axis of the roller 2 can be pivoted in both directions, whereby the stowage gap 16 is reduced or enlarged, which causes an increase or decrease in the quantity applied.
• FIG. 9 shows a device according to the invention, which is preferably intended for dewatering, that is to squeeze tissue webs, the device being arranged in a stationary manner and the tissue web to be treated being passed vertically in the direction of arrow 11 'from below, for example from a liquid bath between magnetic strip 1 or magnetic roller 1 ' and roll 2 gap formed upwards - for example in a drying machine.
• the auxiliary device that also serves to guide the two rollers 2 and 3 used in the example of FIG. 9 or when the magnetic field is switched off, the
• Holding rollers in their position is made in two parts and is identified by the numbers 4 and 4 '.
• the number 3 ' identifies the position in which the roller 3 can be replaced if necessary.
• Roll 2 can be changed in the same way.
• Fig. 10 shows a basically similar device according to the invention as Fig. 9, only with the difference that the device has been pivoted by 90 degrees, so that the two rollers 2 and 3 are arranged hanging in the magnetic field and the processing plane horizontally, in the direction of Arrow 11 'runs.
• FIG. 11 shows a variant of the inventive concept similar to FIGS. 7 and 8, wherein either the device is moved in the direction of arrow 11 or the material surface to be processed is moved in the direction of arrow 11 '.
• the front part of the auxiliary device 4, seen in the direction of movement, is widened, similar to that in FIG. 8, and is formed on the side facing the processing area as a storage area for the application substance 12.
• the arrow 18 shows that the profile strip 4 serving as an auxiliary device is drawn in the direction of the arrow 18 up to the dashed line
• the application example in FIG. 12 shows that the device according to the invention can preferably be designed in the mirror-symmetrical arrangement identified by a and b - as a twin device - preferably an application device.
• the at least two side parts connected at their ends to each other, at one end U-shaped profile strips 4a and 4b are given the two additional functions, printing ink or other liquid application substance, by the special shape and arrangement shown in FIG. 12, and by the im to lead the lower area of the two profile strips 4a and 4b, which faces the processing plane or template, into the relatively narrow gap into the zone delimited by the two rollers 2a and 2b, in which the application process takes place.
• the liquid pressure required for the application process is generated by the liquid itself, that is to say by hydrostatic means, it being possible to do so
• the twin application device according to the invention shown in FIG. 12 also offers a novel, technically fully corresponding solution for these sealing problems.
• FIG. 13 shows a further application device according to the invention in a symmetrical twin arrangement, also identified again with a and b, and in contrast to the illustration shown in FIG. 12, the twin application device shown in FIG. 13 is preferably suitable for ink application in flat screen printing. Accordingly, the difference between the inventive concept according to FIG. 13 and FIG. 12 is that the two individual devices a and b connected to form a twin device are moved further apart and are each equipped with their own magnetic strip 1a (or magnetic roller 1a '(not shown)).
• the two profile strips 4a and 4b on the sides facing the plane of symmetry, which form the boundary of the paint container in the lower region are designed in principle as ink jam profiles as shown in FIGS. 8 and 11.
• the twin device If the material surface 6 to be printed, together with the support 7 serving as the conveyor belt and the template 8, is thought to be stationary during the application process and the twin device is moved in the direction of the arrows 11, the storage gap 16a and the application device causes (in addition to the liquid pressure) 1a plus 2a plus 3a plus 4a the application process, while the device 1b plus 2b plus 3b plus 4b mainly has a color-limiting and color-sealing function. When the direction of movement changes, the twin device also changes its functions as described above.
• FIGS. 1 to 13 The versatility shows that the invention presented here is of great importance and represents a major advance over the previous state of the entire printing application and other processing technology for sheet-like material.
• the representations shown in FIGS. 1 to 13 are not to be understood as complete, delimiting, but only as exemplary representations of the existing configuration, arrangement, dimensioning and application options.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Treatment Of Fiber Materials (AREA)
• Coating Apparatus (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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Cited By (7)

Families Citing this family (1)

Citations (7)

• 1980
  • 1980-04-29 IT IT8053173U patent/IT8053173V0/it unknown
  • 1980-04-29 WO PCT/AT1980/000014 patent/WO1980002400A1/de active IP Right Grant
  • 1980-04-29 DE DE8080900755T patent/DE3071441D1/de not_active Expired
  • 1980-04-29 IT IT67680/80A patent/IT1129083B/it active
  • 1980-04-29 ES ES491005A patent/ES491005A0/es active Granted
  • 1980-04-29 BR BR8008648A patent/BR8008648A/pt unknown
  • 1980-11-17 EP EP80900755A patent/EP0028608B1/de not_active Expired

Patent Citations (7)

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