FI70182B - REFERENCE TO A FRAME RELEASE FOR RELEASE FOR JASPERPORSLIN - Google Patents

Description

1 70182

The present invention relates to a machine method for producing embossed blanks, which are then attached to the surface of the base-formed bodies, in the manufacture of jasper porcelain, and to a method for producing embossed blanks. In order to implement the method, a device has been invented in which the embossed blanks take shape.

Jasper porcelain is porcelain with embossed and burnt-on heel images on a porcelain mass containing a dye that differs from the color of the container or object they adorn. The manufacture of this porcelain dates back to antiquity, but above all in the 1860s and 1870s, English porcelain companies developed the jasper technique into an artistically high-class industrial production. In this case, for example, vases were made from porcelain pulp, which were dyed through with saturated pastel colors, and provided with relief patterns on all-white porcelain. The opposite design has also occurred, i.e. with white base porcelain and heels in the dyed mass.

The heels, which have been a few centimeters in size for tableware and up to one decimeter in size for jewelery, have hitherto been made by hand, either by casting or pressing. In this case, the mass from which the heels have been taken has been made in the usual way. However, in the case of colored heel images, the basis weight has been compensated for the variation in dimensional loss due to dyes during drying and firing of the products. Conversely, in the case of white / colorless heels, the basis weight is adjusted for the dimensional variation of the 2 70182 dyed base products. A plastic embossed mass having a moisture content of 20 to 30% f is usually compressed by a vacuum mill using a template to a suitable size. From the bar thus obtained, blanks are cut, i.e. pieces, the thickness of which has been chosen taking into account the depth of the embossed image to be produced.

The pieces are placed one at a time on an electrically heated plate attached to a base to the rear of which a lever is attached by means of a hinge. On the underside of the lever, spaced from the hinge, corresponding to the position of the plate, is a matrix which is the negative of the desired heel image. The matrix is also electrically heated (about 130 ° C) to evaporate the water and to promote the release of the embossed blank from the matrix after the so-called impact. The outer end of the lever is formed as a handle and a substantial portion of the weight of the lever is localized to the portion around the handle. This is because the impact described below would give well-compressed heels.

Impact of the heel image is accomplished by pulling the lever down with a large force, causing the matrix to strike a piece that presses against the plate and the back pressure affects all mile details of the matrix. The struck heel image usually follows up with the matrix and is then removed from it, followed by a time-consuming cleaning of the heel image from excess mass. .If the features of the heel image are irregular, cleaning may become a chore.

After cleaning, the heels can go directly to the base pieces with clay suspensions, ceramic adhesives with two organic ingredients that are removed when the products are fired. Alternatively, the embossed images can be stored on ceramic plates encased in textured textiles. Depending on the size and shape, the finished heel images can be stored in a humidification cabinet for a few days to a few weeks before being attached to molded or cast, decorated porcelain cappings.

One of the disadvantages of the handmade used so far is that some of the blanks are damaged and become unusable during cleaning. In addition, this method of fabrication is in itself time consuming, and when a more unskilled worker performs the stroke, the result may be incompletely filled design details of the embossed blanks. In general, the sales of embossing blanks made by the prior art are so poor that they financially burden production in significant quantities.

It is an object of the present invention to provide a machine method for making the described embossed blanks. The device shown for carrying out this mechanical method is made in such a way that the embarrassing disadvantages of the manual manufacturing method are avoided.

The specific features of the method will become apparent from the claims below.

The method is carried out in such a way that the pulp produced for the production of embossed blanks is introduced into strands at one end of a device suitable for carrying out the method, preferably in a vertically arranged magazine. A knife at the bottom, preferably pneumatically operated, cuts the pulp rod into pieces of suitable thickness. They are then conveyed between two horizontally running, thin films, for example a polyethylene adhesive film with a thickness of 0.008 to 0.020 mm, in a matrix engraved with the desired 4,70182 engraving as a negative. Naturally, when engraving the matrix, the engraving is made to such a size that the drying and firing loss of the porcelain mass is compensated.

Once the piece is stopped by means of a photocell or microswitch or otherwise on the matrix, the pneumatically controlled clamp preferably goes down and presses the mass into all the details of the model. In this case, at the end of the heeling process, the excess mass is cut off along the edges of the embossing blank without breaking the films. Then, when the press has returned to its starting position, the films are set in motion and the embossed blank is removed from the matrix. It is adhered to the upper film by its adhesive forces on its flat back side, while the excess mass cut out of the blank remains on top of the lower film. As the film paths continue to move, they pass over their own fold edge. In this case, the excess mass comes off and falls on the conveyor belt, which takes it to the collection container for recovery. At the same time as the upper film is pulled over its fold edge, the embossed blank detaches from the film and falls onto another conveyor belt that runs a small distance below the fold edge. The blank faces the conveyor belt on its patterned surface, but as the belt pivots at the end of the conveyor track, the blank follows a short distance around the belt pivot roller before it falls, eventually coming to the right on the receiving plate. From there, an impulse is given to stop the machine, and only after the embossed blank has been removed from the receiving plate, to be manually attached to the surface of the porcelain body, does the machine begin the next cycle. In this case, it should be noted that for each cycle, the films appear only to such an extent that the embossed blanks will hang in the upper film at intervals of a few centimeters. This means that once the machine has been put into continuous use, a number of stamped blanks hang on the upper film.

5,701 82

The films are taken to the heel punch in the form of a track from the upper and lower storage rolls. The film paths are pulled over the guide rollers and the above-mentioned folding edges through the machine with two motor-driven rollers. The motor of these traction rollers runs intermittently according to a pulse from a sensor, for example a photocell, which senses when the embossed blank has been removed from the receiving plate. In order to carry out the method, the device according to the invention has the special features which appear from the claims. A preferred embodiment of this device will be explained in more detail with reference to the accompanying drawing, in which:

Figure 1 shows the device in a vertical view.

Figure 2 shows a section taken along the line II-IT in Figure 1.

The machine for embossing an embossing blank for jasper porcelain preferably has a vertically arranged tubular magazine 1 for pulp strands 2 kneaded in a vacuum mill. A lowering member provided with a blade or wire, hereinafter referred to as a knife, is arranged in the lower lowering opening 3 of the magazine 1. This cuts the pulp strands into pieces of selectable thickness so that it is moved back and forth under the lowering opening 3 by means of a first hydraulically or pneumatically driven piston cylinder 5. If, due to the sticky composition, the cut piece does not come off the knife 4, it is separated by a push rod 6 having the piston rod of the second hydraulic or pneumatic cylinder 7.

The cut piece falls on the lower film path 8, which is conveyed from the lower storage roll 9 through the machine. The lower diaphragm web 8 acts as a conveyor belt and burns below the upper diaphragm web 10, which is introduced into the machine from the upper 6 70182 storage rollers 11. By pulling both film webs 8 and 10 together at the end of the machine speed.

Once the lower diaphragm path 8 has moved the piece onto the engraved matrix 16, the photocell 17 provides an impulse to the control unit 18, which stops the engine 15. The piston body 21 attached to the piston rod 20 of the piston cylinder 19 in between when the punch body terminates its impact, which, due to the flexible property of the film, stretches outward until the mass of the piece has filled all the details of the pattern engraved on the matrix 16. The clamp 21 reaches its lowest position by a small distance above the matrix 16 by force. In addition to compacting the embossing blank formed by the mass of the piece, it is then achieved that the excess mass, which rolls over the edge of the engraved matrix, breaks against the sharp edge of the engraving. The motor 15 then starts again, to pull the next piece onto the matrix 16. The interest-embossed embossed blank will depend on the effect of adhesion on its upper flat surface in the upper film path, while the cut excess mass will be in the lower film path 8.

After all the embossing blanks have been embossed, the film paths each continue to pass over their respective fold edges 22 and 23. The angle of these folding edges is less than 90 °. It follows that although the mass has adhered to the film, it detaches from it as the film passes over the fold edge. Thus, the excess mass detaches from the lower film 8 as it passes over its folding edge 22 and falls onto the conveyor track 24 which carries it to the collection container. The upper film 10 passes through an upper folding edge 23 70182, below which a second conveyor track 25 passes, whereby the embossed blank detaches and falls its patterned side down onto the conveyor 25. This takes the blank to the front of the machine 26 to then drop the patterned side up onto the receiving plate 27. The second photocell 28 records the embossed blank on the receiving plate and the control unit 18 gives an impulse to stop the machine until the blank is removed, after which a new cycle is started.

Both film paths can go to waste or thicker films can be rinsed and reused. In this case, however, it may be considered appropriate to transfer them in such a way that the interest rate adjustment does not take place at exactly the same point as in the previous use. Another possibility is also to switch the upper and lower membrane between runs.

The method is also applicable and the machine can be used to make other porcelain details that are decorated on a substrate, for example decorations.

Claims (10)

Method for producing reliefs for decorating jasper porcelain, characterized in that matched pieces (clusters) of plastic porcelain pulp are retrieved from a magazine (1) for placing between TVS foils (8, 10), that the claws between the foils are positioned over a matrix (16), in which the claws are pressed out by means of a stamp (21) in a pattern engraved in the matrix (16), thereby cutting off excess mass between the stamp (21) and the edge of the matrix (16), without the foils (8, 10) ) is cut off, and that the embossed relief and the excess pulp are separated for separate processing. Method according to claim 1, characterized in that the embossed embossing material and the excess pulp, by adhesion, follow each film (8, 10) away from the matrix (16) so that the dci films are pulled over breaking edges (22, 23) from the films (8). , 10) and by means of conveyor belts (24, 25) are brought to a worker for manual decoration of a porcelain piece and to a waste container respectively. Method according to claim 1, characterized in that, after the embossing of the embossing material, the foil webs (8, 10) are drawn over each of their breaking edges (22, 23), under which the transport webs (24, 25) for excess pulp and embossing material respectively, the latter for bringing the embossing blanks. to a receiving plate (27). Apparatus for producing jasper porcelain reliefs and similar details, characterized in that it comprises means for conveying two foil webs (8, 10) through the device, between which claws are passed over a matrix (16) in which a stamp (21) extends one claw at a time to a relief blank, followed by the foil webs (8, 10)