DE1532382B1 - Process and device for the production of circular, coated pieces from strip-shaped core material - Google Patents

Description

The invention relates to a method and a device for manufacturing circular coated pieces of strip-shaped core material, the coating material dosed approximately in the middle of the later pieces and then afterwards the outside and simultaneous pressing of the core mass is spread on the base, then cut out the circular piece from the strip-shaped core mass and the two parts are separated from each other. One such method is for Example from German patent specification 1181143 known.

In the previously known methods and devices, which particularly have become known in the freshwater industry, for example to produce a foam mass Spreading on a wafer becomes the wafer named in the core mass below processed intermittently. Pieces are then made from this core mass, whereby the cutting takes place partly from below, partly from above. Move in the process the knives do not turn at all or only a fraction of a turn, which means punching, but by no means a clean cutout. The cut out Pieces are then fed to a skin pass device, in which the on the piece to be applied coating material is abandoned and spread. This is where the difficulty arises on that the pieces rotate with the rotating string organ or move away from the Loosen the support so that it is necessary to pull the pieces from the underside to be held in place by vacuum or other suitable means. This requires a complicated one Mechanism for the holding process as well as for the continuation of the pieces. Another Disadvantage, which results from the aforementioned method, is that the individual Pieces are removed from the known bell jar by means of excess pressure, wherein when the air under excess pressure in the bell jar escapes Parts of the coating are carried away and the piece as well as the surroundings of the same, i.e. the wafer waste, soiling, whereby this wafer waste everywhere.

It is also known to apply the material to be coated and to paint to be carried out in an enclosed space where the stirrup moves. This is done by a combined device, which results in a compact design, since the skin pass is applied in the same device as the Stirrup is arranged. The stirrup must, however, for reasons of space be relatively weak, which can easily lead to damage if the coating material is nuts or contains nut parts or other hard parts. Also arise here within Contamination of the closed space leading to resinification, to a limited extent by starting the stirrup on the bell, which special devices for Requires washing and caulking. Here, too, the core mass is on a Pad placed, held with vacuum and after cutting out from a ribbon-shaped or strip-shaped wafer part lifted out and fed to the skin-pass device. Although this device is useful when applying and painting non-viscous Coating material, which also had no hard components, was effective However, the disadvantages described above affect the rate of production, in particular because the application of the overlay material and the spreading including the feeding process to the skin pass station takes place practically at one point, what if the processed wafer remains at one point in the production process presupposes.

The invention is based on the object of a method and a device to create, with which a fast and clean production of with one coating provided pieces possible while eliminating the disadvantages described above is.

This object is achieved according to the invention in that the application of the coating material and the spreading of the same in a known manner in one another separate steps is carried out and that when cutting out the coated Piece a pre-cutting takes place. The application of the oversize compound is included subsequent elapse through U.S. patent, carried out separately from this 3 149 58: 1 known.

While in the known processes pieces are made from the core mass and these were then fed to a skin pass device in which the on the piece to be applied upper draft was abandoned and passed, takes place the production of the finished piece according to the invention continuously, in such a way that that at the same time a pre-cut of the core mass takes place during the coating process and only after completion of the coating process by additional knives that are in the Pre-cut are performed, the actual piece detached from the core mass will. With this method, there is no need to use negative pressure. A device for carrying out the method according to the invention with a coating station, a spreading and cutting station and a separating station, the spreading and cutting station an up and down movable and rotatable bell bell with a has inside the same arranged stirrups. is characterized by that the stirrup is designed as a web firmly connected to the bell and the lower edge of the bell jar is designed as a pre-cutting knife, wherein the knife edge is ground so that it is the outer edge of the cutting bell edge forms. This configuration makes it possible to prevent the leakage of the Material to be coated and thus also contamination outside of the coating area to prevent lying part of the core mass. This is also the area on which the coating material is passed, precisely limited. This simultaneously becomes a clean pre-cut achieved.

In order to support this thicker application of the coating material the stroking bar arranged so that it divides the stroking lock into two equal parts divided, with the height of the stroking bracket from the center of the stroking bell starting in the direction of the bell-bell edge decreased. This will affect everyone On the side of the streak a certain reservoir is formed in which the coating material can be found can push in. when the stirrup rotates in its lowest position and the for a minimum elimination amount applies, the above Amount of too much coated material protruding from the lower edge of the stirrup scraped off and printed into the reservoirs. Only when you lift the stirrup the mass not required up to then carries itself to the spread that has already taken place evenly, which will be discussed later. However, it is important here that the lifting of the stroking bell with the stroking bow on the viscosity of the Mass is matched so that the centrifugal force not withstanding mass already is stripped off when the cover of the circular cutout by lifting the string bell rims is finished. Of course the bell has to be used still circulate at the moment of take-off, otherwise the one with the canceled one Mass related stirrups would tear up the mass.

In order to promote the painting process itself, it is provided that the edges of the stirrup are broken or rounded to make a pressing stroke too to reach excess coating material while removing. This beneficial Construction of the stirrup allows the coating material in different Way to apply. So it can be, inter alia. by a rounded bracket with the usual Apply the shape in a rounded flat layer. But also rings or wavy ones Surfaces can be incorporated if the stirrup is accordingly on its lower edge is shaped.

To loosen the bell jar from the one underneath as quickly and effectively as possible to cause located core mass, it is provided that the interior of the bell bell communicates with the atmosphere through openings. This creates a tear up of the piece from the edition as a result of a possibly prevailing in the bell bell Avoided negative pressure.

To cut out the circular piece is provided that the lower edge of the bell jar at least one synchronously rotating, up and down movable Separating knife is assigned, which is ground so that it is at the cutting edge of the Pre-cutter directly adjoins. This arrangement ensures that the When sealing the room in which the stirrup runs, advance notice was given is continued until the circular piece is detached without being through placing the bell jar on the core mass causes damage to the same would.

It is of particular advantage that hold-down pins are provided on the cutting bell for pressing the core mass onto the base. A known ring-shaped retaining plate can be assigned to the hold-down pins when they are pressed on and released. This achieves a lag or lead of the annular retaining plate, with hold-down pins also being mounted in the retaining plate so as to be axially displaceable and being able to be pressed off the retaining plate by springs in the direction of the core mass. These measures are known per se from German patent specification 1,181,143.

To insert the bell jar at a desired adjustable time to be able to, is provided that around the bell bell rim circumferential cutting knife to be equipped with an adjustable device for lifting and lowering. To the continuous To enable processing of the zage led core mass, the ver can be spread and Cutting station in relation to the continuously moving core mass also with and be mobile back.

The drawing shows an exemplary embodiment for a device shown schematically according to the invention. F i g. 1 is a view of the Device with an associated conveyor, partially in section, FIG. 2 a perspective View of the bell jar with beater and pre-cutting or separating knives, F. i g. 3 shows a schematic representation of the production process, FIG. 4 two control schemes for the coating bell with the knives, which moves with the continuous conveying, where the difference in height is shown for the sake of better illustration, F i g. 5 the in F i g. 1 shown device in normal position, F i g. 6 the device according to FIG. 5 when the coating material is spread, with the bell jar engaging into the core mass, F i g. 7 shows the position of the device according to FIG. 5 when cutting of the piece and with the bell bell lifted and FIGS. 8 to 13 the bell bell at various stages of the process.

The in F i g. 1. The device shown is a spreading and cutting station 1. It contains a stroking bell 2 with a stroking bow 3 incorporated in it, the stroking bell having a lower edge worked out as a pre-cutting knife 4. The pre-cutting knife 4 is ground from the inside out so that its cutting edge represents the outer diameter of the opening of the cutting bell 2 at the same time. In the upper part of the cutting bell 2 openings 5 are made. The bell jar 2 is carried by a bell jar shaft 6 which runs vertically and is connected to a motor 19 at its upper end. The motor 19 is attached to a mounting plate 1.8 and thus carries the bell bell 2 by means of the bell bell shank 6. A knife carrier 33 is rotatably and axially displaceable around the bell bell shank 6 and is held by a compression spring 10 upwards against a collar 7 of the bell bell shank 6 will. The knife carrier 33 is rotatably fastened in a guide yoke 11 by means of a ball bearing 8. The compression spring 10 which presses the knife carrier 33 upwards is supported at the bottom in a spring bearing groove 9 of the cutting bell 2. The knife carrier 33 has two arms with knives 12 which are sharpened in such a way that their cutting edge slide on the outer diameter of the cutting edge 2. Outside these knives, hold-down pins 13 are attached, which protrude downward beyond an annular retainer serving as a bearing. The hold-down pins 13 are mounted in bores in the retaining plate 14 and are pressed down by springs 15. The retaining plate 14 protrudes beyond the cutting bell 2 shown in the rest position and this in turn projects beyond the cutting knife 12. The retaining plate 14 is guided and suspended by means of guide rods 16 in bores 23 of the mounting plate 18. Springs 17 press the retaining plate 14 downwards, the guide rods 16 and the springs 17 reaching through openings 20 in the guide yoke 11. The guide yoke 11 and the mounting plate 18 slide in bores 21 and 44 on stationary guide rods 22, which in turn are fastened to a base plate 24. The base plate 24 is circulated by an endless conveyor belt 25 which carries a strip-shaped core mass 26 on its upper tower. A traverse 31 is mounted in the legs of the base plate 24 and carries control cams 27 and 28 at both ends, on which plungers 29 and 30 slide, which are fastened at the other end to the mounting plate 18 and to the guide yoke 11, respectively. The entire in F i g. 1 shown device can be moved back and forth in the direction of the conveyor belt, for which means are provided which are not shown in the drawing for the sake of simplicity. In contrast to this movement, the traverse 31 remains with the control cams 27, 28, whereby the cam guide is removed from the plungers 29 and 30 and transferred to the mounting plate 18 and the guide yoke 11 .

The traverse 31 can also be replaced by a shaft that is attached to their ends carrying control cams or eccentrics, which are set in circulation, whereby the movement of the control cam also affects the mounting plate 18 and the guide yoke 11 transmits. In this case, the device works stationary while it is in first described trap is moved with the conveyor speed so that the in Fig. 4 illustrated movement diagram for the bell jar 2 and the cutting knife 12 results.

In Fig. 2 is the painting and cutting tool in perspective Representation shown, the design of the bell jar 2 as a cavity with a stirrup 3 dividing this into two equally large parts can be clearly seen is. The stirrup 3 is sickle-shaped and corresponds in design the side facing the bell-bell opening, the silhouette of the finished trained circular piece to be made. However, this page can also be equipped with recesses and projections or tongues, so that the skin pass of the circular pieces leads to ring-decorated circular wafer pieces, whose The silhouette essentially corresponds to the lower edge of the stirrup. In the F i g. 2 the openings 5 can be seen, which pass through the bell bell lead to the outside world. It is important that the lowermost edge of the stirrup 3 does not reach the edge of the cutting knife 4. The distance to it can be accordingly the desired thickness of the skin to be applied can be changed, or depending on of the desired depth of incision when pre-cutting the core mass during covering the area to be treated. It can also be seen that the stem of the bell bell 6 is received by the knife carrier 33, which in turn carries the cutting knife 12, which have cutting edges 32 resting on the circumference of the bell jar 2. In dash-dotted Lines are shown in which way the knife 12 down to the cutting knife 4 of the bell-shaped rim slide past. It is obvious that at this arrangement of the cutting knives 4 and 32 both have the same cut in the Cause nuclear mass. The schematic representation in FIG. 3 shows the process the manufacture of the dosing and cutting out of the circular pieces from the Core mass. The endless conveyor belt 25 carries the strip-shaped one on its upper run Core mass 26 which passes a feed station or metering station 34: it carries is, from which the coating material 35 in predetermined '\ lcn (ien on the surfaces the pieces are deposited, which are provided as circular cutouts. in the As the promotion continues, these dosed amounts of coating material get under the spreading and cutting station 1, where the spreading and Cutting process is vorgenoninicti. It can be clearly seen that the pieces in the Core mass remain, fed to the sugar dusting station 36 and in this position @verden dusted there and only afterwards without the conveyor belt being soiled is, down from the strip-shaped core mass led upwards (waste) exit and pass through a further conveyor 38 as fully prepared Ausoesclitiittene and powdered semi-finished products 37 supplied for further processing will. The strip-shaped residual core mass 26 is lifted off by a lifter 40, which is arranged outside the area of the circular cutouts and can also be arranged in multiple copies. The removal of the residual core mass 26 takes place by take-off rollers 41, which transfer the residual core mass to a collecting container 39 from where further processing can be carried out if necessary.

The diagram in FIG. 4 shows the diagram of the bell-shaped bell path 42 and the diagram of the separating knife path 43 N during the skin-pass and cutting process. The direction of the arrows indicates the movement of the cutting lock 2 or \ v. the separating knife 12 on, with the spreading and cutting station 1 running along with it. 5 to 1 1 the mode of operation of the device is described. In Fig. 5 the spreading and cutting station is in the rest position. After the granulate 26, on which there is a metered skin-pass compound 35, has been fed, the spreading and cutting station is put into operation. According to FIG. 6 the entire device through the control device, which has now become effective, e.g. B. the control cams 27, 28 in F i g. 1 down to the core mass, the height being set so that the bell jar 2 penetrates with its precutting knife 4 into the core mass. During this lowering process, the hold-down pins 13 first touch the core mass 26 and hold it tight, whereupon, after overcoming the tension of the springs 15, the Festlialtcplatte 14 embraces and depresses the circular section in front of #, eseliene surface, whereupon the bell, which has meanwhile been rotating, continues with it Drive 45 on the cutting bell 2 in rotation offset cutting knife 12 go down. The pre-cutting knife 4 (see Fig. 5) penetrates the core mass 26 to the predetermined depth and pre-cuts the circular piece. At the same time the skin-pass compound 35 is distributed over this surface without the skin-pass compound being able to be sprayed outwards because of the complete covering of the skin-pass compound by the bell 2 and the penetrating precutting knife 4. After the skin pass, the cutting bell 2 is lifted and at the same time the cutting knives 12 are controlled downwards, where they penetrate the preliminary cut produced by the cutting knife 4 in the core material and continue this until the core material 26 is fully penetrated. This cutting takes place as shown in FIG. 7 can be seen, still with the core mass 26 held, so that a rotation of the circular piece is not possible, especially since the bell jar is lifted up to a safe distance above the distributed coating material and no longer has any contact with the circular piece. The device is then lifted again and this first lifts the knives 12 out of the plane of the core mass 26, then the retainer 14 hanging on the mounting plate 18 , and finally the hold-down pins 13 detach from the core mass 26, which now move on to the sugar-dusting station 36 ( according to Fig. 3) is conveyed. Further processing is already shown in FIG. 3 described.

The behavior of the skin pass compound is shown below with reference to FIG. 8 and 13. Thereafter, the coating 35 when lowering the rotating Stroke bell 2 with the stroking bow 3 detected and one part by the rounded Edge down and thus pressed wide, but on the other hand by the centrifugal force and its viscosity to the outside and at the same time also through the shape of the bell pressed down (Fig. 10).

The further the bell 2 with the handle is lowered (F i g.11), the wider the coating is spread. By centrifugal force and The coating material is pressed from the middle as long as there is still space at the edge 4, promoted to the outside world. But as soon as the space at the edge 4 is fully painted and more the coating was applied well than there is space for 3 under the lowered stirrup, the excess coating material is in front of the stirrup 3 and above the same pushed back. The in FIG. 8 and 12 shown collections. By centrifugal force, the lower rounded edges of the stirrup 3 and through the viscosity of the coating slip now creates a permanent mixing, that of takes place outside inwards in the middle from bottom to top, as shown in FIGS. 8th, 9 and 12 can be seen.

This constant circulation of the material to be coated then causes the excess material to be coated, as shown in FIG. , 8 is particularly clearly shown distributed as an upper layer 35 a (F] g. 13) above the lowest point made in the smear. Only a thin layer of the material to be coated remains on the coating tool, which, however, is removed or replaced by a new one during the next coating process by centrifugal force and the circulation of the material to be coated, as it does not have enough time to dry on or to gum up until then . The tool is therefore always self-cleaning.

The upper layer consisting of the excess coating material, which is shown in FIG. 13 is denoted by 35a , thus builds up parallel to the original shape of the dressing, to the same extent as it is given off by the stirrup 3 going upwards.

It is according to another embodiment for the coating device it is not absolutely necessary for the bell jar to be closed in a circle. It is essential that, depending on the viscosity of the material to be coated A side cover is provided in a sufficient area in front of the stirrup 3 is the z. B. on the in F i g. 8 range of the material to be coated got to. In this case, the painting tool can be propeller-like with side cutting edges, be executed.

It is of particular importance that the cutting knife 12, so the outer cutting tools for final cutting out of the circular piece are not allowed to represent a ring from the core mass. Otherwise the liability would be like this large, especially when the knife goes deeper, that the circular piece falls into this knife ring would pinch, tear itself out of the core mass 26 and itself rotates with the knife ring and would get stuck in the device. They are in the device According to the invention, neither ejector nor suction device or other additional and externally controlled holding means required, as in the previously known devices were indispensable.

It is essential for the implementation of the method that the strip-like Shaped dough sheets by continuously gluing pieces together takes place that are at least so large that they have a multiple of the area, which has the finished wafer.

By sticking parts on top of each other or sticking together from core mass one then obtains the strip shape in the desired dimensions, see above that the process can be carried out continuously. The width of this strip-shaped Core mass must be dimensioned in such a way that it is torsion-proof during processing of the same is e.g. B. on attacks until the individual process steps from giving up of the material to be coated, painting, until punching, etc. have taken place.

Claims (13)

Claims: 1. Method for producing circular, coated Pieces of strip-shaped core mass, with the coating material dosed approximately on the Applied in the middle of the later pieces and at the end to the outside and at the same time Pressing the core mass onto the base is spread, the circular piece then cut out of the strip-shaped core mass and the two parts are separated from each other, characterized in that the application of the coating material and the elapse of the same in a known manner in separate steps is carried out and that when cutting out the coated piece a pre-cutting he follows. 2. The method according to claim 1, characterized in that the strip-like shaped core mass consists of pieces continuously glued to one another, which have at least a multiple of the area of the finished piece. 3. Device for carrying out the method according to claim 1 or 2, with a coating station, a spreading and cutting station and a separating station, the spreading and cutting station an up and down movable and rotatable bell bell with a inside it having arranged stirrup, thereby characterized in that the stirrup (3) is fixed as one with the bell (2) connected web is formed and the lower edge of the bell jar as a pre-cutting knife (4) is formed, wherein the knife edge is ground so that this Forms outer edge of the cutting bell edge. 4. Apparatus according to claim 3, characterized characterized in that the stroking bar (3) divides the stroking bell (2) into two equal sizes Parts divided, with the height of the stirrup from the center of the bell starting in the direction of the bell-bell edge decreased. 5. Apparatus according to claim 3 or 4, characterized in that the edges of the stirrup (3) are broken are. 6. Device according to one of claims 3 to 5, characterized in that the lower side of the stirrup (3) of the desired silhouette of the item to be coated (35) corresponds to the circular piece (37). 7. Device according to one of claims 3 to 6, characterized in that the interior of the bell jar (2) is in communication with the atmosphere through openings (5). B. Device according to one of claims 3 to 7, characterized in that the lower edge of the bell jar (2) is assigned at least one synchronously rotating, up and down movable cutting knife (12), the knife edge of which is ground so that it is directly on the cutting edge of the Pre-cutting knife (4) is adjacent. 9. Device according to one of claims 3 to 8, characterized in that on the Cutting bell (2) Nicder retaining pins (13) for pressing the core mass onto the base are provided. 1.0. Device according to Claim 9, characterized in that the hold-down pins (13) are assigned a known ring-shaped retaining plate (14) which moves behind or in front when pressed on and released. 11. Apparatus according to claim 9 or 10, characterized in that the hold-down pins (13) in the retaining plate (14) are axially displaceable and supported by springs (15) in the direction of the core mass (26) must be pressed off the retaining plate. 12. The device according to claim 8, characterized in that around the bell- shaped edge (4) circumferential cutting knife (12) is equipped with an adjustable device (11, 30, 28) for raising and lowering. 13. Device according to one of claims 3 to 12, characterized in that the spreading and cutting station (1) can be moved along and back with respect to the continuously moving core mass (26).