EP0775577A1 - Device for processing layer material - Google Patents

Abstract

The tool has a tool base piece (15) which forms a treatment zone (18) and determines relative motion in a process direction (41). There are mounting means (20) for the attachment of at least one interchangeable working insert like a plate (34) to the treatment zone. The means are magnetic where at least one magnetic unit (22) is placed in a receptacle (21) to draw and attach the insert to the treatment zone and so adhere. The tool is designed for operation to at least 100 - 120 degrees C in the region of the mountings and the treatment zone.

Description

The invention relates to a tool with which in particular flat, paper or foil-like material is processed, e.g. precisely delimited on one surface side with a coating or the like. can be provided or printed.

The tool has one at its ends e.g. in a machine frame or the like so to be determined or movably accommodated in the base body that it or the like relative to the material, the frame. can execute a relative working movement in one working direction, in particular a rotating movement about its longitudinal axis. The paper web or the like. can be guided along the circumference of the tool under continuous tensile stress and machined by it in the area of a working gap between the tool and a counter-tool in a continuous pass.

With such tools, it is expedient to replace tool or machining inserts, such as flat cliché inserts to be able to hold so that the tool can be converted for different machining operations, in particular without having to be removed from the storage. If the tool is operated at working temperatures that are above 50, 100 or 150 ° C in the area of the working zone, as is the case, for example, when applying a hot glue coating or self-adhesive layer, it can be problematic to hold the insert securely if the positive holding forces coming from an energy storage device against lifting off from the base body are essentially formed only by forces which use against the base body, such as, for example, in the case of fluid suction forces, magnetic forces or the like. the case is. With increasing temperatures, the holding force can decrease significantly, in the case of permanent magnets above the so-called Curie temperature, at which a ferromagnetic material loses its magnetism and which is specific or different for magnets with different materials. However, for secure holding of one or more inserts spaced apart from one another in or transversely to the working direction, it is necessary to maintain the holding force essentially constant at all working temperatures that occur.

It is conceivable to provide parallel longitudinal grooves in the base body, transverse to the working direction and parallel to the working or working gap plane, and to use them in the rectangular cross-section, including pole plate or shielding and therefore determining a preferred direction, directly in the longitudinal direction, and fixed by gluing. With such a design, it is difficult to ensure the temperature resistance of both the magnetization and the adhesive attachment. At high peripheral speeds of the working zone or of the base body, therefore, if not complex form-locking connections used, magnetic parts can be loosened by centrifugal forces from their holder and from the rest of the tool, which leads to serious damage. However, the peripheral speed should be at least 100 or 140 m / min.

The invention has for its object to provide a tool in which disadvantages of known training or the type described are avoided. Further tasks can be to avoid a noticeable decrease in the holding forces directed transversely to the holding surfaces, to enable rapid replacement of the machining inserts and to ensure a simple assembly of the tool even at high temperatures of the interlocking holding surfaces.

According to the invention, the tool or the holding means are designed for operation at temperatures of at least 100 to 120 ° C. in the area of the holding means or surfaces, this temperature expediently even at at least 160 to 180 ° C., at least 200 up to 250 ° C, at least 300 to 350 ° C or above 400 ° C.

For the magnet units adjacent in the longitudinal direction of the tool, at least two separate receptacles which penetrate the mounting surface of the base body are advantageously provided, between which the base body directly forms an intermediate delimitation or a contact surface for use. If the holding force is exerted by suction in the area of this opening, the openings form adjacent suction openings, each of which is limited in one piece over the circumference. Only a single magnet unit with a single magnet body can be arranged in each receptacle, which is used to achieve a preferred expansion and alignment of the magnetic field can have a shield or a pole reinforcement. These expediently form a jacket which is closed continuously around the magnet or field axis and / or continuously over the length of the magnet body, or a closed cover on the side of the magnet body facing away from the holding surface. As a result, this cover can be directly connected to the base body on the circumference and / or on the end face, so that the magnet unit can be permanently fixed without being in direct contact with or connected to adjacent units. The magnetic body is contact-free compared to the base body and the adhesive attachment.

It is conceivable to use at least one magnet as a ceramic or barium ferrite magnet, as an iron magnet, as a hard ferrite magnet or the like. form, however, such magnets are expediently completely dispensed with and instead an alloy magnet, in particular an aluminum-nickel-cobalt magnet is used, which can be produced by sintering a powder or by casting and expediently contains copper and titanium in addition to iron. The adhesive surface of the magnetic body can be easily grinded or the like. Machining and so align flush with the adjacent or immediately adjacent surface sections of the base body. The magnet can also contain the elements samarium, neodymium and / or boron.

The attachment of the respective magnet unit to the base body is also resistant to the temperatures mentioned. The magnet unit can or the like in the receptacle of the base body by pressing or shrinking, screwing. are attached, wherein for example the outer casing surrounding the magnetic body forms an external thread in the longitudinal region enclosing the magnetic body, which threads into an internal thread the recording intervenes. At its end facing away from the adhesive surface, the unit can also have a reduced-diameter thread mandrel for securing against axial or positive locking relative to the base body. A particularly simple design results, however, if the unit is fixed with respect to the base body exclusively with frictional or adhesive play-free, for example with an anaerobic, aging-resistant and temperature-resistant adhesive which is so low-viscosity before curing that excess amounts of adhesive when manually inserting the magnet Unit pressed out flowing out of the receptacle and there is an adhesive layer completely free of inclusions or bubbles. Their minimum or maximum thickness is advantageously less than three or two tenths of a millimeter. The receptacle can be formed by a cylindrical bore, such as a blind hole, with a surface roughness Rz of at least 10 or 20, in particular about 30. In the hardened state, the hardened adhesive is heat-resistant up to one of the temperatures mentioned, in particular up to 200 ° C.

The base body can be made in one piece, in particular as a tubular jacket, from a ferromagnetic material, the contact surface of which can be hardened or hardened for the respective application, for example by carburizing, so that the base body can be made wear-resistant.

The magnet units can be arranged without contact over the entire length or the entire circumference of the base body in a uniform, continuous, narrow grid, have a width of at least 15 or 20 mm in view of the adhesive surface and have a length that is larger than its width. Each magnet unit is expediently cylindrical and multi-part, whereby it is a single Contains magnetic body and the individual parts are molded to one another by a composite surface. Based on the total contact surface of the tool, the proportion of the surface of all adhesive surfaces or cross sections is expediently at least 10 or 15% and at most 30 or 25 or 20%, in particular approximately 17.5%.

The machining insert advantageously has a plate made of ferromagnetic material to be applied directly to the surface of the base body, for example a flexible sheet metal plate of less than one or half a millimeter in thickness, which has a continuously thicker coating on its working side is provided with a material which is considerably more pressure-elastic than the plate. This coating can be a plastic, for example silicone, and engages in the material during processing or transfers the glue to the material in a high-pressure process. In addition to the adhesive holding means, the insert can be fixed by form-fitting engagement with the base body parallel to the holding surface, in particular against movements in the working direction, in particular with plug-in means, the plug-in direction of which is transverse to the support surface and the plug-in links, on the one hand, in one piece with the insert and, on the other hand can be formed in one piece with the base body.

These and further features emerge from the claims and also from the description and the drawings, the individual features being realized individually or in groups in the form of sub-combinations in one embodiment of the invention and in other fields and being advantageous and capable of being protected by themselves Can represent versions for which protection is claimed here.

Fig. 1

einen Ausschnitt eines erfindungsgemäßen Werkzeuges, teilweise geschnitten,

Fig. 2

die Anordnung des Werkzeuges in einer Maschine zur Bearbeitung von Lagen-Material im kontinuierlichen Durchlauf,

Fig. 3

einen Querschnitt durch das Werkzeug gemäß Fig. 1,

Fig. 4

einen Ausschnitt der Fig. 3 in wesentlich vergrößerter Darstellung, und

Fig. 5

einen Ausschnitt der Fig. 3 in nochmals vergrößerter Darstellung.

An embodiment of the invention is shown in the drawings and is explained in more detail below. The drawings show:

Fig. 1

a section of a tool according to the invention, partially cut,

Fig. 2

the arrangement of the tool in a machine for processing layer material in a continuous pass,

Fig. 3

2 shows a cross section through the tool according to FIG. 1,

Fig. 4

a section of Fig. 3 in a substantially enlarged view, and

Fig. 5

a section of FIG. 3 in a further enlarged view.

The tool 1 here is a cliché cylinder which is provided in a device 2 for transferring hot glue to a paper web. The material web can be processed in a continuous pass before and / or after this processing and at a distance therefrom in further processing stations after deduction from a material store, wherein it is continuously kept in tension by conveyor devices at a distance before and after the device 2 or the other devices becomes. In the device 2, which has to be pushed parallel to the tool axis horizontally in its working height onto a floor frame, then locked against it and thus to be arranged interchangeably in this working position, the material web between the peripheral surface of the tool 1 and that of a counter tool 3 becomes approximately horizontal in the running direction 9 conveyed through and applied hot glue to fields smaller than her on the top as a wafer-thin layer. For this purpose, the rollers 1, 3 arranged in a vertical axial plane form a passage and working gap for the material web, the upper boundary of which forms the roller 1.

On the upper side facing away from the roller 3, an application roller 4 for the coating material runs on the circumference of the tool 1 and is supplied with this material at a distance from the application point by an application nozzle 5 directed against its circumference. The peripheral surface of the application roller 4 is provided in a grid pattern with a pore for receiving the application material, namely preheated from the nozzle 5 layered hot glue. With a doctor blade 6 directly following the nozzle opening in the direction of rotation, the layer thickness of the application to the roller 4 is kept constant and between the peripheral surface and the facing surface of the nozzle head a glue reservoir gap with a cross-section is formed, which in the direction of rotation reaches the doctor blade 6 enough. The glue fed to the roller 4 at about 160 to 180 ° C. is transferred to the heated tool 1 after a rotation of less than 180 or 90 ° and from there to the paper web after a little more than 180 ° rotation and maintenance of the temperature in the working gap printed. For temperature control, the peripheral temperature of the tool 1 is detected with a temperature sensor, for example a rolling or non-contact sensor 7, and then a heater 10 which is located entirely within the tool 1 and which heats the entire peripheral surface of the tool 1 from the inside is controlled.

The respective preassembled units 1 and 3 to 6 are in the region of their ends on two lateral cheeks 11 of a device frame 8, possibly with roller bearings 12, in the area of which the tool drive is also located. The heater 10 is formed by a heating rod lying essentially contact-free in the central or longitudinal axis 39 of the tool 1, which heats the inner surface of the tool 1 by heating radiation, from where the heat is conducted to the work surface. Outside of an end face of the tool 1 or on an outside of a cheek 11, in the axis 39 for the heater 10, is the current supply and discharge 13, which is formed by suitable, separate and immediately adjacent contacts. The heater 10 is at a standstill and does not rotate with the tool 1. Between this cheek 11 and the working area of the tool 1 there can be a drive or gearwheel of the drive 14 which is connected in a rotationally fixed manner.

The tool 1 has an axially extending over more than the working width, dimensionally stable base body 15 or tubular jacket 16 of consistently constant wall thickness, which forms the base body with front parts 17 rigidly attached at its ends and having shaft extensions for storage or drive. The end parts 17 close the end openings of the jacket 16 essentially tightly with annular disk-shaped plates and through a central channel of a front part 17 the heater 10 is passed over most of the channel length essentially without contact.

The two outer and inner circumferential surfaces 18, 19, which are coupled to one another with good thermal conductivity, of the jacket 16, which determines the maximum working width with its length, are cylindrical. The outer peripheral surface 18 includes at most up to or up to it reaching holding means 20 which form grid-like distributed, completely separate holding zones or holding surfaces in the peripheral surface 18. With several adjacent holding zones, a work insert or cliché is permanently used during the operation in a frictionally engaging manner against the peripheral surface 18. The peripheral surface 18 is completely accessible at any time without removal from or transverse displacement of the tool 1 relative to the frame 2, so that the cliché can be attached, removed or replaced transversely to the peripheral surface 19 without any further assembly work.

The support zones of the same size are delimited in a circular manner in the circumferential surface 18 over their circumference and are arranged in grid lines parallel to the axis 39 and in the circumferential direction with the same smallest interspaces that are smaller than the width or half the width of a boundary. The holding zones are evenly distributed over the entire length and the entire circumference of the jacket 16.

Each holding zone or adhesive surface 24 is formed by a separate, non-contacting holding or magnetic unit 22, the axis 40 of which intersects the axis 39 at right angles or lies at right angles to the working zone or working surface 18. Each unit 22 contains an Al-Ni-Co magnetic body 23 which is only exposed in the envelope or circumferential surface 18 and has a diameter of at least 10 and at most 15 mm and, in contrast, a greater, for example approximately twice as long. The circumferential surface and the end face 25 of the magnetic body 23 facing away from the adhesive end face 24 are closely fitting covered by a single, cup-shaped, one-piece shield 26, the outer circumference and associated end face, in turn, closely fitting in the manner of pole plates with a single, cup-shaped, one-piece pole reinforcement 27 Soft or hard iron or the like. are covered. These with each other and with the magnetic body 23 over the entire surface by pressing or the like. connected sheaths 26, 27 are like the magnetic body 23 is continuously cylindrical over the respective associated length, have flat end faces and extend with their annular end faces to the peripheral surface 18, from which they form a continuous continuation curved about the axis 39. These end faces of the parts 23, 26, 27 are coupled to the base body 15 with good thermal conductivity and are heated by the heater 10.

Each preassembled unit 22 is arranged in a separate receptacle 21 which is formed in one piece with the base body 15 or the jacket 16, namely a radial bore which extends from the peripheral surface 18 with a constant width to its bottom surface over a length which is approximately one third is smaller than the thickness of the jacket 16, so that the receptacle 21 does not penetrate the continuously closed peripheral surface 19. The outer circumferential surface 28 of the unit 22 or the pole reinforcement 27, which is constantly cylindrical over the length of the preassembled unit 22, forms, with the corresponding continuous inner circumferential surface 29 of the receptacle 21, a gap of at least half a tenth and at most one tenth which is constant over this length Millimeter gap width, which or the like with a securing means 30, such as a high temperature resistant adhesive, cement. is filled. The bottom surface 31 of the receptacle 21 is then flat and ring-shaped on the peripheral surface 28, 29 or the means 30 with an inner ring diameter smaller than the diameter of the magnetic body 23 and forms a stop surface for the full-surface contact of the associated flat end surface 32 of the unit 22 or the cover 27. The surfaces 31, 32 are in direct engagement with one another, so that there is essentially no means 30 between them. A hollow space or receiving space 33 free of the unit 22 adjoins the bottom surface 31 or its inner ring boundary, which is in the axis 40 lies and can also include a radial channel passing through the peripheral surface 19. The bottom surface of the bowl-shaped receiving space 33 can be produced in one operation with the correspondingly ground tip of the countersink drill or milling cutter producing the receiving bore 21.

Before inserting the unit 22, the medium 30 is applied to the circumferential surface 28 and / or 29 in a flowable state and in a somewhat larger amount than is necessary for the gap filling, after which the unit 22 is inserted into the receptacle 21 by hand parallel to the axis 40 and possibly is used to distribute the means 30 under reciprocating rotary movements. Here, the excess agent 30 is displaced radially outward into the space 33 and / or out of the annular gap opening in the peripheral surface 18 until the surfaces 31, 32 abut against one another. After the insertion of all the units 22, which initially still protrude slightly above the surface 18, the surfaces 18, 24 are cylindrically ground together around the axis 39 and are therefore matched to one another without joints and shoulders. The position of the respective unit 22 against movements parallel to the axis 40 can also be ensured by means which engage in the unit 22 or the body 15 transversely or radially to the axis 40, such as a locking or threaded pin.

At least one machining insert 34, which is substantially smaller than the total surface 18, 24, is continuously secured with the anisotropic magnets 23 covered by it within the cover field over the entire surface of the peripheral surfaces 18, 24 and coupled to it with good thermal conductivity. The insert 34 has a base body 35 made of ferromagnetic, which is at most 0.3 mm thick and continuously closed over its entire surface extent Sheet metal, which can be adjusted manually from its relaxed flat state to the curvature of the peripheral surface 18, 24 and can be held in this curvature solely by the magnetic force of the magnets 23, including a coating or support 36 on the plate side facing away from the peripheral surface 18 . This support 36 made of silicone, which is fully bonded to the associated plate surface of the base body 35 by adhesive bonding, initially has a consistently constant thickness of at most 6 or 3 mm and is then processed to produce the high-pressure cliché pattern only at those locations where none Pressure is to be transferred to the paper web, which therefore does not belong to the work area 37. These remaining areas 38, which can directly adjoin the edges of the plate 35 which are transverse and / or parallel to the working direction of the peripheral surface 18, are reduced by milling or other processing in the thickness of the support by more than half the thickness of the working area 37, so that the working area 37 which does not adjoin the said edges of the plate 35 projects radially from them.

Due to the design described, the insert 34 is secured against lifting along the circumferential surface 18 exclusively by the magnetic force against lifting off and through the surface closure with the circumferential surface 18, 24.

For additional, if necessary, positive locking of the insert 34 against movements parallel to the working direction 41, determinations 42 can be provided immediately after the cover field of the peripheral surface 18 determined by the insert 34, the interlocking form-locking members 43, 44 of which are each in one piece with the plate 35 or the jacket 16 can be formed. To form a form-fitting element or plug-in connector 43, the associated edge of the plate 35 without the support 36 or with this be angled at an acute angle against the inner surface 19. A plug opening 44 which is closely matched to this form-locking member 43 is formed by an axial slot which penetrates the peripheral surface 18 at a distance from the surfaces 24 and which is correspondingly inclined relative to an axial plane of the axis 39 passing through it and only the surface 18 or none of the units 22 or holes 21 passes through. The front edge member 43 of the insert 34 in the working direction 41 lies at an acute angle opening to the axis 39, so that it can easily slide out of the openings 44 when the insert 34 is lifted off, despite little play.

Even without these interlocking members 43, 44, the holding force of the means 20 can be completely sufficient for the operation described, so that the interlocking members 43 can be dispensed with. The magnetic field of each magnet 23 has a preferred, greatest extent in the direction of the axis 40, for example in that the crystalline structure of the magnetic material is rectified in this direction. The spatial effect of the magnetic field is limited by the shield 26 and an undesired magnetization of the tool or the surrounding device parts is prevented.

The circumferential surface 18, 24 can be provided in the axial direction and the circumferential direction with a fine line grid of closely adjacent, optically recognizable microlines, which enable the respective insert 34 to be precisely aligned. All properties and effects can be provided exactly as described, only approximately or essentially as described or more deviating therefrom. The tool is also suitable for the cold application of coatings or, if necessary with minor changes, for cutting processes with stamping inserts, such as stamping plates, suitable, which, as described, are to be fastened to the base body 15.

Claims (11)

Processing tool for processing sheet material or the like, in particular a plate cylinder (1) for applying glue, characterized in that it has a relative working movement forming a working zone (18) and a relative working movement lying in a working direction (41) determining tool base (15) and holding means (20) for the interchangeable fixing of at least one machining insert or the like, such as a cliché insert (34), on the working zone (18), the holding means (20) How magnetic means are provided with at least one magnet unit (22) arranged in a receptacle (21), in particular for fixing the insert (34) so as to be adhered to the working zone (18) and / or the tool (1) for operation at temperatures in the region of the holding means (20) and the working zone (18) of at least 100 ° C. to 120 ° C. Tool according to Claim 1, characterized in that the holding means (20) has holding zones (24) which are distributed in a grid-like manner over the working zone and are at least partially spaced from one another, that in particular the holding zones (24) in the region of openings in the surface (18) associated with the working zone ) of the base body (15) and that preferably the respective opening is delimited in one piece over the circumference or is formed by a bore (21) in the base body (15) and / or contact surfaces between adjacent openings in the longitudinal or working direction (41) essentially non-attractive fixing of the insert (34) is provided directly on the base body (15), wherein these contact surfaces or the jacket (16) of the base body (15) can be hardened. Tool according to Claim 1 or 2, characterized in that the holding means (20) contain individual magnets (23) which are spaced apart from one another, that in particular a single magnet (23) directly has a contact surface (24) for the insert (34 ), the boundary of which is curved around a zone axis (40) lying transversely to the working zone (18) and that preferably the single magnet (23) within the boundary continuously adjoins this and, directly with a magnetic pole surface, an uninterrupted contact and magnetic surface ( 24) forms and / or the contact surface (24) is surrounded by at least one jacket (26, 27) separate from the base body (15). Tool according to one of the preceding claims, characterized in that the holding means (20) contain at least one one-piece magnetic body (23) which has at least one separate outer body (26, 27), such as a jacket, at least one of the Working zone (18, 24) facing end or the like. A magnet unit (22) which is to be preassembled on the base body (15) forms such that in particular an outer body has a magnetic field shield (26) or an outer body has a magnetic pole amplifier (27) for increasing the magnetic force on the contact surface (24). for the insert (34) and that preferably to form an anisotropic magnet unit (22) is an outer body (26) which is in direct contact with the magnet body (23) and is made of a non-magnetizable material, such as brass, or an outer body (27) is made of an ferrous material. Tool according to one of the preceding claims, characterized in that the holding means (20) contain at least one magnetic body (23) which is stable up to a Curie temperature of at least 200 ° C to 300 ° C, that in particular the magnetic body (23) as A permanent or alloy magnet is formed and that preferably the magnetic body (23) of at least one of the elements aluminum, nickel, cobalt, iron, copper, titanium, samarium, neodymium, boron or the like. contains. Tool according to one of the preceding claims, characterized in that at least one magnet unit (22) of the holding means (20) rigidly secured in position transversely to the working zone (18) by mutual abutment of stop surfaces (31, 32) with respect to the base body (15) is that, in particular, an end face of the magnet unit (22) facing away from the working zone (18, 24) and surrounding the magnetic pole axis (40) is provided directly abutting the counter surface (31) of the base body (15) and that preferably Stop surfaces (31, 32) only occupy part of the associated surface of the magnet unit (22). Tool according to one of the preceding claims, characterized in that the magnet unit (22) and the base body (15) are mutually fixed in the region of mutually adapted circumferential surfaces (28, 29) against mutual movements transverse to the working zone (18, 24) in that in particular between the circumferential surfaces (18, 24), a connection layer (30) or the like which is essentially continuous over the length and / or the circumference of the magnet unit (22) and is essentially continuous. Minimum layer thickness is provided and that preferably the magnet unit (22) in a direction transverse to the working zone (18, 24) or the like exclusively by means of non-contact adhesion to a magnet body (23) of this unit (22). or is determined essentially without positive locking. Tool according to one of the preceding claims, characterized in that the magnet unit (22) is fixed relative to the base body (15) by a connecting means (30) which is flowable before curing, in particular that the connecting means (30) is displaced to the magnet unit (22) is adapted and that, preferably to the magnet receptacle (21), a receptacle (33) which is widened compared to an adhesive or adhesive gap for a flowable adhesive (30) or the like before hardening. is provided. Tool according to one of the preceding claims, characterized in that the machining insert (34), like a high-pressure cliché with at least one raised working area (37), has a plate-shaped, flexible base body (35), in particular that the base body (35) on its working side with a pad (36) made of a pressure-softer material opposite it Material existing material is provided and that preferably the insert (34) has at least one form-locking member (43) for engagement in a counter member (44) of the base body (15). Tool according to one of the preceding claims, characterized in that the tool (1) with a heater (10) for the working zone (18, 24) or the like. It is provided that in particular the heating (10) in the base body (15) is essentially contact-free and / or rod-shaped and that preferably the base body (15) for forming the working zone (18, 24) has a tubular component (16) and on it Each end has an end part (17) for mounting the tool (1) in a tool holder (8, 11). Tool according to one of the preceding claims, characterized in that the tool is designed as a cliché cylinder (1) with magnets (23) which are arranged in the circumferential and longitudinal directions in a narrow grid of at least ten in the circumferential direction immediately adjacent to one another and at a distance from one another, that in particular the magnets (29) are aluminum-nickel-cobalt permanent magnets and that preferably all magnets (23) are formed by identical, cylindrical magnet units (22) with at least one flat end face (32) and in the axial direction of the cylinder (1) Adjacent magnets (23) without direct mutual support in this axial direction are only supported directly on the base body (15, 16).

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