IT8319567A1 - Form for pressing a decorative layer onto a profiled piece as well as the process of creating a negative profile in such a form - Google Patents

Description

DOCUMENTATION

BOUND

"SHAPE TO APPLY BY PRESSING A DECORATIVE LAYER _S_U_UN PIECE ... PROFILE AS WELL? ' THE .PROCE-DIMENTO TO CREATE A NEGATIVE PROFILE IN SUCH A FORM "

Summary

A negative form is indicated for applying by pressing a decorative layer on a workpiece, which, by melting a. molding mass .20, ._ with the use of a .positive model 2.6_pu? be suitable for the various profiles of the workpiece to be machined. The_mass .of.forming.2.0.is ... located within. a.tank .12 which can be.heated by means of heating ribs J.4 and, more? precisely, optionally at a temperature sufficient to harden the adhesive used and at the plasticization or melting temperature of the molding mass 20.1

Employing the form in a suspended manner, Jlestre mit? open bottom of the tank 12 is closed by a closing plate 62 for the transformation. of the molding mass. 20 and the cpstolatu ^. The heating elements 14 bear support plates 6C. between which vertical bearing portions are fixed, in the form of a strip, of the molding mass 20.

(Picture_J>) _

The invention relates to a form for applying by pressing f? N a press, a decorative layer on a profiled piece, where between the decorative layer and the workpiece there is a layer of adhesive, as well as a layer of adhesive. a method of creating a negative profile in such a form. _ _ _ The furniture today is mainly manufactured with particle board material ^ what on the surface? equipped with a decorative layer. Such decorative layers are especially natural wood veneers, furthermore also synthetic resin sheets and printed sheets, coated with paper-based synthetic resin. Virtually all flat parts of furniture are manufactured using such coated particle board.

In many pieces of furniture, however, there are not only flat surfaces, but rather? also rounded or wavy portions, for example, strips. . of profiling, pan-. jnelli- profiles., - .cassone.t ti _e. similar .. _

_ Self. you_want .to equip such_products _pro.filat.i_. with a decorative layer-, then_.s_i_dovr.anno f ab b reborn. negative molding forms. _a.saaj ._._ c p_s_tos.e., ... which is profitable only for very large numbers of pieces, the molding of a decorative layer on a profiled piece by using membrane presses. under vacuum? Is it possible only when the profile of the piece to be machined? dish. In addition to there ?? by using membrane presses under vacuum. do you have to accept long pressing times? and a modest productivity? of the press. The quality of the surfaces d ^^ jprqdoibtq_finito? furthermore satisfactory only to a relative extent

N-molding presses are also known in which the pressing of the decorative layer onto a jarofil piece to be processed takes place with the use of a membrane subjected to a positive pressure. Also in this case the quality? surfaces_pu? not always be satisfactory and the introduction of heat to the bonding of the adhesive is difficult, so that? IUT will have to accept again the pressing times; in addition to there? relatively high energy costs are incurred.

With the present invention it is therefore intended to create a shape by pressing a decorative layer onto a profiled piece to be machined, which can be manufactured economically and is also easily adaptable to profiles. different from the workpiece.

_ This problem ? solved according to the invention. thanks to a _form_c_onfgrme_to. claim 1.

The form according to the invention can? be adapted in a simple way, in the same place of use, to the piece that one wants to manufacture from time to time due to the fact that a suitable positive is cast in the plasticized molding mass, the latter is allowed to solidify and the model it is then removed again. Which model can? simply be used a piece that? equipped with a heat-insulating and heat-resistant coating, the thickness of which corresponds to the thickness of the decorative layer to be applied.

Xn this way a high flexibility is achieved? in the conformation of production in the furniture factory; wanting to switch to a new model, this will not be? subject to the need? of having to have a new negative form built in external workshops? which not only? expensive, but? re. it also takes a long time.

. Advantageous further aspects of the invention disclosed in the subordinate claims? The further aspect of the invention, according to claim 4, is advantageous, from the point of view of a simple replacement, of the heating elements. cation .5 - it becomes possible to heat with different; intensity the various heating elements con orine mind at the respective lprq distance _from the coramettit / il? of the adhesive between the decorative layer and the workpiece, thus compensating? the greater resistance to the heat that the thermal current must overcome in order to arrive from the distant heating ribs to the bonding of the adhesive

With the development of the invention according to claim 6, this adaptation is achieved automatically without the user having to carry out tests or calculations for the individual case.

The materials indicated in claim 8 are particularly advantageous in that they do not have to be heated to an excessively large extent for the purpose of manufacturing the negative profile. profitable so much, from the tip of vi-! is of the - safety. intrinsic suf fi.ci.ent e., a_ Jbemperat ure of the order of ... 12.0? .C, to which they are used to allow the adhesive to set at the beginning. Among the materials indicated, those metals which melt in the aforementioned temperature range, for example wood alloys, which are also used for soft soldering, are particularly interesting. excellent, addi: tion of: C? bre to the bonding of the adhesive? In consideration of a containment of tolerances in the pieces to be machined? particularly advantageous, qug. the mass of the forming, the use of synthetic thermoplastic material ^ Q ^ ^ these_synthetic materials allow themselves to be elastically deformed to a modest extent, so that the negative profile can? adapt to dimensional variations of the pieces which are usually manufactured with chipboard material in panels and are not machined with high precision

The further aspect of the invention according to claim? advantageous from the point of view of a further increase in the conformability of the form. .in manors. .. essentially the same.

With a further development of the invention according to claim 11, it is obtained that the drowned bodies, when the forming mass? melted, automatically move towards its free surface, where the spacer bodies prevent the drowned bodies from reaching the surface. On the negative profile there is therefore a seamless panel, consisting of the material of the molding mass.

The development of the invention according to claim 12 allows the entire form to be used also in a suspended manner. The suspended arrangement of the last has the advantage that the pieces to be worked can not be placed on the lower table of the press. be placed on them and _gui properly pressed .. This facilitates considerably .the., work.

With the further aspect of the invention according to claim 13 it is obtained that the negative profile can be obtained in the form suspended in a press, the form therefore does not have to be disassembled. . according to _la._ri; sell_caz.i.one__1_4, v_? and ne. guaranteed that the molding mass cannot be melted__when? 11end? open _rivq.lta towards_ the bottom, of the tub not? closed by the closing plate. _ _ _ _ .. _ _ _ Does the development of the invention fruitful claim 15? advantageous in consideration of the use of a workpiece as a positive model with the further development of the invention according to claim 16 it is obtained that projecting portions of the decorative layer do not undergo, upon pressure, a fold in correspondence of the. board ... of. workpiece. _, _ _

The invention is hereinafter illustrated more? -in .de11agli.or_in_relation to examples of realization and with reference to the attached drawing. In it:

Figure 1 shows a section through a mold to be used in the application by pressing decorative layers onto workpieces, as well as? through positive molds to impress a surface profile in a molding mass which is in the mold; _ _ _ _ _ Figure 2 shows a section through the shape - .. of Figure 1, after having impressed the? surface profile, ..nonch? through _ _ __vers.o_.a piece _to._to work and_a stratc._ .. _ de.co?rativo_da _appl.i care on this mediate them __ ^ pressing, j

Figure 3_shows a block diagram of a device for heating the spun surface of the form with regard to re-heating. _ _ spective geometry of the profile;

Figure 4 shows a single-line diagram of a control circuit for a heater of the heating device according to Figure 3;

Figure 5 shows a section through a modified shape, while the surface profile is impressed; And

Figure 6 shows a partial section on a pi? large across a portion, adjacent in the free surface, of the volume of the forming mass of an ulter

modified form.

Figure 1 shows a flat prismatic tub 12, -aporia pour-1 'high, -what? resting on the? - fixed lower table 1.0 of a socket and what? consisting of thick steel sheets welded together me or by massive metal plates joined by screws. On the bottom of the tank there are heating ribs 14, which have a triangular cross section and which, looking perpendicularly to the section plane, extend until they come into close contact with the side walls of the tank. The lateral walls of the tub, which match the ribs, of heating l4, ... possess. from the passages_.nQn .m.egl.io. shown, __ ch <.are .aligned., with the holes. 16 of the ribs of heating l? and connect to these. Inside the holes l6 are placed some resistors 18.

In the tank 12 there is a molding mass 20 which at room temperature and up to about 130'C has stability? intrinsic and can? be repeatedly melted. In Figure 1, the molding mass 20 shown in the molten state; the molten forming mass therefore has a smooth, flat, seamless horizontal surface. Which molding mass will come? chose a synthetic thermoplastic material that up to 130? C still has stability? intrinsic allowing cos? also a setting of the usual adhesives for the application of decorative layers on pieces manufactured with chipboard panels at the usual temperature of 120 ° C. ethals, le_po_liammides 6, 66, 11 and 12 ,. i.p? lipropi1eneti? len- and butylene polyethylene glycolates and the di-ethylene copolymers with ethylene. These synthetic materials have melting temperatures at the same time. iie relatively low in the range of about 60 to about 270 ° C, so that? the molding mass 20 must not be heated to very high temperatures for shaping purposes and only moderate heat resistance of the positive patterns employed for shaping the molding mass must be required.

The thermoplastic synthetic materials indicated above are of particular interest also for the fact that they also present a certain deformability in the geometrically stable state. elastic, so that? the form ready for use can? compensate, by local elastic deformation, dimensional variations of the pieces to be machined.

In cases where no importance is to be attributed to such a deformability? elastic of the molding mass, which pot ^ of molding _pu? a low melting point glass or a low melting point metal may also be used, for example - those types of glass known - as glass - for welding., and those metal alloys, such as alloys. _for..brasatura, dol.c.e., _.... _. . .

_ _ Figure .1 also shows the plate, movable _ 22 of a press, to which by means of ___ v.iti_2.4__? fixed a positive pattern 26 which serves for the profiling of the free surface of the molding mass 20, in the cross section of pattern 26 j at 28, with dashed line ^? the transverse section of a piece 30 to be machined (Figure 2) is drawn, on which, with the use of the form l? ip ^ 'ta.j, a decorative layer 32 coated with adhesive must be applied by pressing, for example a 'veneer.

It is noted that the positive model 26? pi? weight of the workpiece 30 due to the thickness of the decorative layer 32, substantially for? has the same profiling as the surface. At the edges of the positive model 26 also has projections 34 which in a uniform and disciplinary manner are joined to the profiled surface.

The positive model 26? manufactured with a material that can? support, without prejudice, for a short time the melting temperature of the molding mass 20. for example be manufactured in __woodnp __. ma_ssiQC_iOj .__ _

_ Instead of a positive model 26, _ factory as, above described with oversizing equal to the decorative layer, one can? also use a ^ model corresponds to the workpiece and what? equipped with a heat-resistant coating, the thickness of which corresponds to the thickness of the decorative layer to be applied.

If, once the molding mass 20 is melted, by lowering the plate 22 of the press, the positive model 26 is immersed in the melt and then the heating resistances are switched off! 18, after which the molding mass 20 is? resolidified and after that model 26? raised again, in the molding mass 20 a printed reproduction 36 of the positive model 26 is obtained. ins_er.ire_un._pezzqfcla work 30 and on this place-? _re the decorative layer 32 coated with adhesive. AD - by taxing the plate 22 of the press, the decorative layer 3.2., Due to the effect of the shaped surface, arranges itself M n strict geometric constraint on the profiled surface of the workpiece 30 Maintaining this pressure, when the adhesive is joined between the workpiece .30 and decorative layer __32 _, ._ through the molding mass _20, ._ from the heating resistances 18 is added. The adhesive hardens and sets. The last mentioned heating of the molding mass 20 takes place only up to a temperature dj. about 120? C. cosicch? the molding mass 20 retains its stability. intrinsic. _ _

How can you? infer from Figure 2} the different heating ribs \ k do not have the same distance as the yellow shaped surface 36. In order to ensure, however, a uniform flow of heat towards the different areas of the adhesive joint, those heating ribs 14 which are more? distant from the shaped surface 36 can be heated to a greater extent than the heating ribs 14 which more? I am adiacep.

--td-to the -surface -shaped-36? - where even the heating temperatures more? high are-still lower .. than the-temperature-of-plasticization of.? the forming mass. 20-, Figure 3 shows an arrangement for automatically keeping account of the profile of the shaped surface 36 during the heating of the forming mass 20 under certain working conditions

--On - a -fixed-support 38 rests the model..posi ?: tivo 26 used-also -for? The-.fabrication._from._ --superf-icio shaped 36.? For-each rib of -heating -18.? provided ... a position transmitter 40. -I-position transducers 40. 4 ..e_p.o_s.s_i_e_ <iqna ..5en.s0ri_.ad_a.s_t_a_4_2_ movable orthogonally. To the surface of the 4 edge ?? gno_ 4.8, They ... generate an electrical output signal associated with the movement of the rod sensors 42, _ The first inputs of control circuits 44 are connected to these output signals. starting from a unit? input 46 an electrical signal which? Characteristics J? I ???.? j and ... the desired working temperature and for the type of molding mass used. From que ?? These two signals control circuits 44 each time derive an output signal which preassigns the heating power for the associated heating rib. This output signal is sent to power control stages 48, which on the output side are connected to the heating resistors. 18.? Through an additional unit? input 50, which can be operated by means of a key, the power control stages 48 can be supplied independently, with a control signal which mixes the power control s_tn 48 on a sufficient power, for complete fusion or plastic. .cation. of the forming mass 20. This_auroent_of_the_heating_power can in., additional.and_be_ still. _ _ ... made, dependent, on the fact, that on a line of Ingres s or of the unit? of entry. ? SO is an additional _ available signal _of_block as pi? .over_ will come? again described in the cut with reference to Figure 5.

Figure 4 shows the internal structure of one of the control circuits 44. The output signal of the relative position transmitter 40 reaches the input of a characteristic circuit 54, for example a diode array. In block 54? mentioned that the output signal 0 in the characteristic circuit 54 decreases on the type of a bell curve as it increases. input signal I. In proj? osito si? assumed that the position transmitters 40 generate their maximum output signal when the rod sensor 42G is fully retracted. The output signal of the characteristics circuit 54 is combined in a multiplier 56 with the output signal of the unit. input 46. As mentioned with line, in dashes through a line 58, the output signal of the unit? of placing 46 pu? be simultaneously used in order to modify the characteristic curve de.

? characteristics circuit. In this way you can? take into account different synthetic materials with -propriet? different types of heat conduction.

Figure 5 shows a shape which? destined ac1 a suspended application in correspondence of the pia? stra of a press, The components that in the preceding? de correspond to the components already? described with reference to Figures 1 and 2, again bear the same reference symbols.

The heating ribs 14 are additionally provided at their vei

tic and, of a support plate 60 welded and external dentesis in the longitudinal direction. The support plates 60, after solidification of the reforming mass 20, give rise to a suspension point for the forming mass.

The positive model 26? placed on a pia? closing strainer 62 which accurately adapts to the tank 12 and towards its internal wall. na? hermetically sealed thanks to a gasket tion 64 extending all around. In this way, the molding mass 20 can? be fused with tank 12 fixed in? correspondence- of the.? pias between -22- -of the press. The melt, under its own weight, will then arrange itself on the upper face of the closure plate 62 and the model __pos ?? iv_o_26 .e. after_a -S.uc.CBSsi.v-O? cooling-of the molding_mass 20.,? si__or_holds-of .new, .a printed reproduction of the model-.26..in the mass of_fja.rmat.ur-a .._

_ In the? bottom, of the tank _12 _, _. now .sit.ua.t_o__in_al_t.o_, additionally .openings, di_sfi_a? .o_ 66_ cbe., _ Jb.r.ami_t_e .._ scana1atmre tra3versali__6_8_. of the press, are connected with the surrounding environment, in this way the air trapped in the interior space delimited by the tank 12 and by the closing plate 62 can? vent when the closing plate 62, after the melting of the molding mass 2p, is once again pushed into the tank 12 (by lowering the plate 22 of the

A limit switch "/" cooperates with the lower face of the closure plate 62 which is connected to one of the input terminals of an AND element 72. The second input of the AND element 72 G involved by a further end switch stroke 7 which is fixed at the external side of the tank 12 and which intervenes when the tank 12 rests on the table. the presence of an output signal on the element 0 ????) 72 indicates therefore that the closed end of the tank 12 is closed against the closing plate 62 and that under these conditions the molding mass 20 can be melted without danger. The corresponding release signal for the power control stages 48 is forwarded via line 5 * to input unit 50.

Once the surface profile of the molding mass 20 has been created, in the manner described below. above, the closure plate 62 is removed from the table? 10 of the press and a plate takes its place.

support for workpieces, which with a relatively large clearance engages in the tank 12 and therein. the region of the limit switch 74 presses

? feel an indentation, should it extend? yes up to this area. In this way, the mass of fo: matures 20 will not be able to? be unintentionally heated to the melting temperature until the lower face of the tank 12? open.

How already? illustrated more? above, the materials sin? thermoplastic materials which are preferably used which molding mass are distinguished by a certain deformability? elastic. In order to improve myself. la__ce.d.evole2Lza__delJ.a_mass.a_.of_ forming. 20__e_poter cos? compensate for even greater dimensional variations._of_pieces._to_machine? 0 _ in the .forming mass _.2.Q.,. in the vicinity of _ its..superfinie__lib.er? _, _ s_i_pp.s_s_p.no.insert, additionally still elastically compressible bodies, such as those reproduced in Figure 6 in correspondence 76 ... The bodies J6 consist of rubbery material resistant to high temperatures and are incorporated in spacer bodies 7.8 in the form of a rod which retain the bodies 76 at a predetermined minimum distance between the surface of the molding mass 20. In this node it is ensured that there is no hole in the surface of the molding mass 20 and that the compliance of the molding mass must not be at the expense of large local variations of the mechanical strength. On the contrary, in the molding mass 20 there is an uninterrupted cover plate which, by means of the bodies j6 and the interposed column-shaped crosspieces of the molding mass,? supported by the volume of the forming mass

Thin ropes extend through the bodies 76.

80 of fiberglass, which connect the different bodies 76 forming a lattice

- _ _ .I ~ c, orpi_ 7-6_are.i .__ in_plan _of the reticule? .o_in a hexagonal package or in a square package centered in the area, where.

mesh size and diameter of the bodies 76.

In figure 6. in correspondence of 82? also still reproduced the adhesive layer located

between the decorative layer 32 and the surface of the workpiece 30?

Bench? pi? not better described above, it is understood that for the positioning of the pieces to be machined on the surface 36 of the last, easily loosened and achievable geometric constraint joining systems will be used, for example insertion means or positioning pins, to allow rapid replacement of the workpiece.

It is also understood that the quantity? of the molding mass and the dimensions of the tank 12 will be harmonized with each other so that the molding mass, in the presence of the usual variations in depth between different pieces to be machined, is not forced to come out of the tank, on the other hand it is * for? also enough to completely follow the.

Claims (1)

Form for applying by pressing, in a press, a decorative layer on a profiled piece where between the decorative layer and the workpiece there is a layer of adhesive, characterized by a tank (12) with a flat bottom, from a quantity, located in the tank, of a molding mass (20) which in normal working conditions has its own stability? intrinsic to the application by means of the pressing of the? decorative layer and which by effe? _to__dj, _adduction of alore can be plasticized again, and by a heating device (14 - 18, 40 - '??) associated with the tub, in order to heat the molding mass (20} at the plasticization temperature. 2, - Form according to Claim 1 characterized in that the bottom of the tank (12) bears a multiplicity? of ribs (l4) heated, parallel to each other. 3 ?? Shape according to claim 2, characterized in that the heating ribs (1) have a triangular cross section. 4.- Form according to Claim 2 or 3, characterized in that the heating ribs (14) extend towards the lateral narets of the tub (12). in close contact with these, and have holes (16) connected with the openings through the side walls of the tank, in which heating elements (18) are inserted. 5 - Form according to one of claims 2 to 4, characterized by distinct control circuits (44) for the heating devices (18) associated with the different heating ribs (14). 6.- Form according to claim 5? characterized by the fact that to the control circuits (44)? from time to time, associated ... with a position detector (40), since the different position detectors (-40). are arranged nilineared, .on..uria _? i1a_to a distfiZa..corri.spond.en? e_distanza__of_costJL.a.tu-L re, and by the fact that the elements of_input (42) d? position detectors (4.0) _ cooperate_. with the profiled surface of a sample piece (26) ._ 7.? Form according to claim 5 or 6, characterized by the fact that the control circuits (40 have a circuit of characteristics (54) which reproduces the thermal resistance between the associated heating ribs (14) and the opposite surface portion of the piece (3?) to be machined. 8.- Form according to the tone of claims 1 to 7, characterized in that the molding mass (20) is a glassy, metallic or synthetic material which is in the range from 1 to 50. ? C and .270? C becomes, mplle_o merges _, __ __ _ _ _ _ _ 9? .- Flour according to one of the, claims? ions_d_a__1__finc: a .8, characterized in that resiliently compressible bodies (76) are incorporated in the bulk forging. (20). _ .. _ 10. - Form according to claim 9, characterized by the fact that the incorporated bodies (J6) are the same. nuti_ together, by positioning means (8?) flexed? bile, 1.1.- Form according to Claim 9 or 1.O., -cam iterizjsai.a from Catto that J. incorporated bodies (76) have, with respect to the Corming mass (201, a density a lower DOCO when the Corma is used in feet and a slightly higher density when the Corma is used suspended and, at least in correspondence with the Hunting facing the free surface of the Corma, are equipped with thin spacer bodies (78)? 12. Form according to one of Claims 2 to 11, for suspended use, characterized in that the heating ribs (14) are provided with transverse projections (60), 13. Form according to claim 12, characterized by a closure plate (62) which can be inserted in the end? opening of the tank (12) preventing the melt from escaping. 14.- Form according to Claim 12 or 13, characterized by limit switch transmitters (70, 74), which intervene when the closing plate (62)? inserted or after the form? placed on a support (10), and by an AND element (7 * 0 which groups the output signals of these limit switch transmitters (70j 74) and whose output signal acts as a release signal to heat the molding mass (20) to the flux temperature. 15? -. Pr? failure to create a negative profile in a form according to one of claims 1 to J_4, characterized in that a positive pattern is pressurized into the plasticized molding mass which bears a ter-coating. moresistant, whose thickness corresponds to the spes? sore of the decorative layer to be applied on the workpiece and d? equipped with a means of separation on the outer face. 1_6.- Prcendimenio? According to - claim 15, ea? -ra-t-terrified-by the? fact-that a mo? -of the positive? chet Jiella direction? -tEuigenziale, -has external portions extending beyond the edges of the workpiece 1 Form for applying by pressing f in a press, a decorative layer on a profiled piece where between the decorative layer and the workpiece 5i there is a layer of adhesive, characterized by yasc ^ a ._ (12) with a flat bottom, from a quantity ?, placed in the tank, of a molding mass (20) which in normal working conditions has its own stability? intrinsic to the application by pressing the decorative layer and that by effect. of an additional _adduction. di_caloxe _can e.g. be plasticized again, _and from.a _device. dL heating p_ (14_- .18, _4Q_r _5?) .. associated with the tank? _ to heat the molding mass __ (? 0) _ to the plasticization temperature. _ 2.- Form according to Claim 1. characterized by the fact that the bottom of the tank (12) bears a multiplicity? of ribs (14) riseaidate, parallel to each other. _ _ _ _ 3. Shape according to Claim 2, characterized in that the heating ribs (14) have a triangular cross section. 4, - Form according to claim 2 or 3? characterized in that the heating ribs (14) extend towards the side walls of the tank (12). in close contact with these, they have holes (16) connected with the openings passing through the side walls of the tank, in the i are inserted heating elements (18 ^. 5 Form according to one of claims 2 to 4, characterized by distinct control circuits (44) for the reseal devices (18) associated with the different heating ribs (14). 6. Form according to claim 5 characterized in that the control circuits (44)? each time associated with a position detector (4?), in that the different position detectors 0) are arranged aligned in a row at a distance corresponding to the distance. of the .cont.olatu? re, and from the fact that .the elements, of input .. {? 2) d jrelevatpri_of_position (4?) cooperate _cpn_la__super fiche profiled of a sample piece (26), _ 7, - Form according to claim 5 or. _6t..caj2 characterized by the fact that the control circuits (4 have a circuit of characteristics (54J which reproduces the thermal resistance between associated heating elements) (1? -) and the opposite surface portion of the piece (30 Form according to one of claims 1 to 7, characterized in that the form mass (2?) is a glassy, metallic, synthetic material which in the interval. between_ 15QjiC_ and 27Q becomes, moles e._o melts ,, __ 9. r Form _sec_on one. of the claims from .1. to. to.8? characterized, by. fact_that in the molding mass. (20) are incorporated. bodies .. elastic and compressible, 10, -. Shape according to claim 9, characterized by the fact that the bodies (7.6_) are held together by flexible positioning means (8?). 11? - Form. according to - claim 9 or 10, it characterizes the action that the bodies (76) incorporate present to you, with respect to the forming mass. and a slightly higher density when the mold is used suspended and, at least at the face facing the free surface of the mold, are provided with thin spacer bodies (78). 12 ?? Form according to one of the claims 2-11, for suspended use, characterized in that the heating ribs (14) are provided with transverse projections (6?)? 13. - Form according to claim 12, characterized by a closure plate (62) which can be inserted in the extremity? opening of the tank (12) preventing the melt from escaping. 14.- Form according to Claim 12 or 13 characterized by limit switch transmitters (70? 74), which intervene when the closing plate (62)? inserted or after_what the shape? been co].? located on a support (10), and by an AND element (72) which groups the output signals of these limit switch transmitters (70? 7 ^ 0 and the cu ^ output signal acts as an unlock signal to heat the mass of forming (20) _at the temperature. of_fu: sion. 15_ ?? Procedure for creating a negative profile in a shape according to one of claims 1 to 14, characterized in that a positive model is pressed into the plasticized molding mass bearing a heat-resistant coating, the thickness of which corresponds to the thickness of the decorative layer to be applied on the workpiece and? equipped with a means of separation on-the-outer-face.-16.? Method according to claim 15? characterized - by - the fact - that a positive model is used - which, in the - tangential direction - has external portions? extending? beyond -i-border ;. of the .piece..to? work ? cs_ Description The invention relates to a form for applying by pressing f in a press, a decorative layer on a profiled piece, where between the decorative layer and the workpiece there is a layer of adhesive, as well as a layer of adhesive. a process of creating a negative profile in such a form. The furniture today is mainly manufactured with chipboard material, which on the surface? equipped with a decorative layer. Such decorative layers are especially natural wood veneers, in addition to sheets of synthetic material and printed sheets, coated with synthetic resin, based on paper. Virtually all flat parts of the furniture are manufactured using such coated particle board. Xn many pieces of furniture, however, do not have only on? perfect flat, but? also rounded or wavy portions, for example profiling strips, profiled panels, boxes and the like. . If you want to equip such profiled parts with a decorative layer, then you will have to manufacture very expensive negative molding forms, which? | profitable only for very large numbers of pieces The molding of a decorative layer on the finished piece by using vacuum membrane presses is only possible when the profile of the piece to be machined? dish. In addition to this, by using membrane presses under vacuum, the introduction of heat to the bonding of the adhesive between the decorative layer and the piece to be worked is hindered, so that the do you have to accept long pressing times and a modest productivity? of the press. The quality? of the surfaces of the finished product? moreover satisfactory only to a relative extent. Membrane molding presses are also known, in which the pressing of the decorative layer onto a profiled piece to be machined takes place with the use of a membrane subjected to a positive pressure. Also in this case the quality? of the surfaces there can? not always satisfactory and the addition of heat to the bonding of the adhesive? difficult, so that? long pressing times will have to be accepted again; in addition to there? relatively high energy costs are incurred. With the present invention it is therefore intended to create a shape for creating by pressing a decorative layer on a profiled piece to be machined, which can be manufactured economically and is also easily adaptable on the spot to different profiles of the piece to be machined. to work. This problem ? solved according to the invention. thanks to a form, conforming to claim 1. The form according to the invention can? be adat? nanny in a simple way? in the same place of use, the piece that from time to time it is desired to manufacture due to the fact that a suitable positive is pressed into the plasticized molding mass, the latter is allowed to solidify and the model is then again taken off. Which model can? simply be used a piece that? equipped with a heat-insulating and heat-resistant coating, the thickness of which corresponds to the thickness of the decorative layer to be applied. Xn this way a high flexibility is achieved? in the conformation of production in the furniture factory; wanting to switch to a new model, this will not be? subject to the need? of having to have it built in workshops. external a new negative form, which not only? expensive, but? r also takes a long time. Advantageous further aspects of the invention are indicated in the subordinate claims. The further aspect of the invention according to the claim. advantageous from the point of view, it gives a simple replacement of the heating elements. With the development of the invention according to claim 5, it becomes possible to heat with different intensities. the various heating elements in accordance with their respective distance from the coramettit ra of the adhesive between the decorative layer and the workpiece, thus compensating? the greater resistance to the color that the thermal current must overcome in order to arrive from the distant heating ribs to the bonding of the adhesive. With the development of the invention according to claim 6, this adaptation is achieved automatically without the user having to carry out tests or calculations for the individual case. The materials indicated in claim 8 are particularly advantageous in that for the purposes of manufacturing the negative profile, n must be heated to an excessively large extent. that ? advantageous both from the point of view of operational safety, as well as ?? ._ consideration of energy needs. On the other hand, these materials still have stability. intrinsic. sufficient at temperatures of the order of 120? C, to which they are used to allow the bonding of the adhesive to set. which are also used for soft brazing. These metals ensure excellent heat addition to the bonding of the adhesive. In consideration of a containment of tolerances of the _pieces_ to be machined? particularly advantageous, such as the molding mass, is the use of thermoplastic synthetic material. These synthetic materials allow themselves to be elastically deformed to a modest extent, so that? the negative profile can? adapt to dimensional variations of the pieces which are normally manufactured with chipboard material in panels and are not machined with high precision. The further aspect of the invention according to claim 9? advantageous from the standpoint of further increasing compliance with the development of the invention according to claim J JO.J? gets what, the drowned-in bodies ?? the molding mass are, distributed in manners, substantially equal. With the further development of the invention according to claim 1.1 it is obtained that the bodies are embedded, when the molding mass? melted, automatically move away towards its free surface, where the spacer bodies prevent the drowned bodies from reaching the surface. On the negative profile there is therefore a panel without continuity, consisting of the material of the molding mass. The development of the invention according to claim 12 allows the entire form to be used also in a suspended manner. The suspended arrangement of the. shape has the advantage that the pieces to be machined can be placed on the lower table of the press and the decorative layer can be placed. be placed on d? they and here properly pressed, there ?. considerably facilitates the work. With the further aspect of the invention according to claim 13 it is obtained that the negative profile can be obtained in the arranged form, suspended in a press; the form therefore does not have to be disassembled _? n_proposito, according to the claim. open, facing downwards, of the tub not? closed by the closing plate The development of the invention according to claim 15 is advantageous in view of the use of a workpiece as a positive model. With the further development of the invention according to claim 16, it is obtained that projecting portions of the decorative layer are not subjected to the process. ... pressure, a fold at the edge of the workpiece. The invention is illustrated hereinafter in detail in relation to examples of embodiment and with reference to the attached drawing. In it: Figure 1 shows a section through a shape to be used in the application by means of pressing of layers of corals on workpieces, as well as? through a positive mold to impress a surface profile in a molding mass that is in the mold; Figure 2 shows a section through the shape of Figure 1, after having impressed the surface profile, as well as? through ... towards ... a piece,. to be worked, and a decorative layer to be applied on this by pressing Figure 3 shows a block diagram of a device for heating the pro-spun surface of the last with regard to the re-| spective geometry of the profile; Figure 4 shows a single-line diagram of a control circuit for a heater of the heating device according to Figure 3; Figure 5 shows a section through a modified shape, while the surface profile is impressed; And Figure 6 shows a partial section on a pi? large through a part, adjacent in the free surface, of the volume of the forming mass of a further one modified form - Figure -1 shows a prismatic plate-tub? 12, -opened-upwards-1, which rests on the ... fixed lower table 10 of a press ... and what? consisting of thick steel sheets welded together or of massive metal plates joined by screws. On the bottom of the tank there are heating ribs, which have a triangular cross section and which, looking perpendicularly to the sectioning plane. s.i es'tendon "oT until it comes into close contact with the side walls of the tank, J The side walls of the tank, which are intertwined with the heating ribs. ono._of.passages not better, show * who! they are .aligned_with 1.holes_j6 of the heating ribs .1if_and__they are connected to these. In the tank 12 there is a molding mass 2Q_ which at room temperature and up to about 130 has stability? intrinsic and can? be repeatedly melted. In FIG. 1, the molding mass 20 shown in the molten state; the molten forming mass therefore has a smooth, flat, seamless horizontal surface. Which molding mass will come? chose a synthetic thermoplastic material that up to 130? C still has stability? intrinsic allowing cos? also a grip of the usual adhesives for the application of decorative layers on pieces manufactured with chipboard panels, at the usual working temperature of 120 ° C. Such synthetic materials are, for example, polyacetals, polyacetals, 6, 66, 11 and 12 polypropylene and buti.lejnpjol.iterephthalates, and copolymers, of trafluoroethylene with ethylene. These synthetic materials have; at the same time, relatively low melting temperatures in the range from about 160 to about 270 ° C, so that? the mold 20 must not be heated to very high temperatures for shaping purposes and only moderate heat resistance of the positive patterns used for shaping the mold must be required. The aforementioned synthetic thermoplastic materials are of particular interest also due to the fact that they also present a certain deformability in the geometrically stable state. elastic, so that the form ready for use can? compensate, by local elastic deformation, dimensional variations of the pieces to be machined. In cases where no importance should be attached to such a deformability? elastic of the molding mass, which molding mass can? a low melting point glass or a low melting point metal may also be used, for example - those types of glass known as glass-to-weld, and those metal alloys such as soft-tempered alloys, Figure 1 also shows the movable plate. 22 of a press, to which by means of screws 24 a positive model 26 is fixed which serves for the profiling of the free surface of the forming mass 20. In the cross section of the model 26, the correspondence of 28, with dashed line? drawn the transyrsal section of a piece 3P to be machined (Figure 2), on which, with the use of the finished form, a decorative layer 32 coated with adhesive, for example a veneer, is to be applied by pressing. It is noted that the positive model 26? pi? weight of the workpiece 30 due to the thickness of the decorative layer 32, substantially for? has the same profiling as the surface. At the edges, the positive model 26 also has projections 3 which smoothly and uniformly connect to the profiled surface. ! The positive model 26? manufactured with a material that can support, without prejudice, for a short time the melting temperature of the molding mass 20. for example be made of solid wood. In the place of a positive model 26, fabricate it as described above with sqyradimensionament or even to the decorative layer, you can? also use a model corresponding to the workpiece and what? equipped with a heat resistant coating, the whose thickness corresponds to the thickness of the decorative layer to be applied. If, once the molding mass 20 is melted, by lowering the plate 22 of the press, the positive model 26 is immersed in the melt and then the heating resistances are switched off! 18, after that the molding mass 20 is? resolidified e after model 26? been raised again, in the molding mass 20 a printed reproduction 36 of the positive pattern 26 is obtained. If the pattern 26 is now removed from the plate. 22 of the pressure4- -between the latter and the shaped surface j6 you can? insert __._ a _ piece? la_layorare 3P and on this place- ?. r ?. the decorative layer 3? coated with adhesive. By lowering the plate 22 of the press, the deco layer? ratiyo 32? due to the shaped surface 36 is it arranged with a strict geometric constraint on the prof iled surface of the piece to be machined 30? Maintaining this pressure, to the committing of the ade between the workpiece 30 and the decorative layer. the. The adhesive hardens and sets. The last mentioned heating of the mold 20 takes place only up to a temperature of about 120 DEG C. _the molding mass 20 retains its stability intrinsic. _ _ How can you? infer from Figure 2, the different heating ribs 14 do not have the same distance from the shaped surface 36. To ensure this? despite a uniform flow of heat towards the different areas of the joint of the adhesive, those heating ribs 14 which are located more? distant from the shaped surface 36 can be heated to a greater extent than the heating ribs 14 which more? are adjacent ti-to the surface? shaped? 36, - where even the -heating temperatures more? high are still lower than the plasticization temperature of the -forming mass -20-. . .. . FIG. 3 shows an arrangement for automatically taking into account the profile of the shaped surface 36 during heating of the mold 20 under certain conditions. work. On a fixed support 38 rests the positive model 26 also used for the fabrication of the surface. shaped 36. -For each heating constelature. 18? a position transmitter 40 is provided. -X position transmitters 40 are arranged at equal distances to those of the ribbing deriving from the frame 14 and have sensors, such as shaft 42, which can be moved orthogonally to the surface of the host. ; -gno..48. It generates an electrical output signal associated with the movement of the rod sensors 42. The first inputs of control circuits are connected to these output signals. 44. Second inputs of the latter receive from a unit. di__immis ^ siqne 46 an electrical signal which? ristic features? for the desired working temperature and for the type of molding mass used. From these two signals, control circuits 44 each time derive an output signal which preassigns the heating power for the associated heating rib. This output signal is sent to power control stages 48, which side? Output are connected with the heating resistors? danti 18. Through an additional unit? input 50, operable by means of a key, the power control stages 48 can be independently supplied with a control signal, which sets the power control stages 48 to a sufficient power for the . complete melting or plasticizing of the molding mass 20. This increase in heating power may in addition be further. Jreso dependent, on the fact that. on a line._of-Ingres? | know .of.unit? input 50 is additionally available, an unlock signal, such as jpi? beyond Sverr? .still. described in detail with reference to Figure 5? Figure 4 shows the internal structure of one of the control circuits 44. The output signal of the relative position transmitter 40 reaches the input of a characteristic circuit 5, for example a diode matrix. In block 54? mentioned that the output signal 0 of the characteristic circuit 54 decreases on the type of a bell curve as the input signal I increases. assuming that the position transmitters 40 generate their output signal at least when the rod sensor 42? completely returned. The output signal of the characteristics circuit 54 is combined in a multiplier 56 with the output signal of the unit. of entry '46. As mentioned with dash line by line 58? the output signal of the unit? di..immis ?. sione 46 pu? be used at the same time for the purpose of modifying the characteristic curve of the characteristic circuit. In this way you can? take into account different materials_ si_nteti-cd- with properties? different types of heat conduction. _ . Figure 5 shows a shape which? intended for a 1 application suspended at the pia? strain of a press. The components that in the foregoing correspond to the components already? described with reference to Figures 1 and 2, again bear the same reference symbols. The heating ribs 14 are additionally equipped, in correspondence with their vertex, with a staple plate 60. dentesis in the direction longit ud? naie. 3_tr_and_di. support 6? ._ after the solidification of the molding mass 20f give rise to a point of s_o_sp-e.nsinne j for the molding mass. The positive model 26? arranged_s.u. a closing plate 62 ch? s? accurately adapts to the tank 12 and to its internal wall? na? hermetically sealed thanks to a gasket 64 extending all around. In this way, the molding mass 20 can? be cast with tank 12 fixed in correspondence with plate 22 of the press. The melt, under its own weight, will dispose itself? then - on the upper face of the closing plate 62.. he was born in. positive model .26 and, after jun. subsequent cooling of the molding mass -. 20, a printed reproduction of the model 26-in 1.1 mass of molding is obtained. _ In the bottom ... of the tank 12, now located at the top, there are additional vent openings_: 66__ that ^ _ through transverse grooves 6.8 ... in the_p.ip ._? I_ _ .. j_stra 22 ... of the press , are connected with .1-environment __j surrounding. In this way, the imprisoned air in the internal space delimited by the tank 12 and by the closing plate 62 can? venting when the chipper plate 62, after the melting of the molding mass 2 ID, is once again pushed into the chamber J2 (by lowering the plate 22 of the press). _ _j_ With the lower face of the closing plate sjira 62 j: o does a limit switch JO _ 1 work? connected to one of the input terminals of an AND element 72. The second input of the element? ijto ^^ AND 72 _? affected by an additional limit switch 7 ^ that? fixed in correspondence with the external side of the tank 12 and which intervenes when the tank 12. rests on the table_1.0_of the_pre? do you know? - The. presence -of a .signal, of. output on the 0 AND element? closed by the closure plate 62 and_che_a. these_conditions, the molding mass_ 20 DUO can be melted safely. The corresponding release signal for the power control stages 48 is forwarded via the line; the unit input 50. Once the surface profile of the molding mass 20 has been created, in the manner described below. above, the closing plate 62 is removed from the table 10 of the press and in its place is replaced by a support plate for workpieces, which with a relatively large clearance engages in the tank 12 and in: the region of the end switch stroke 74 has a recess, should it extend up to this area. In this way, the mass of fo] matures 20 will not be able to? be involuntarily heated? given at the melting temperature as long as the lower face of the tank 12? open. How already? illustrated more? above, the materials sin? thermoplastic tetics which are preferably used which molding mass are distinguished - by a certain deformability? elastic. In order to - improve even more? the. compliance of the. mass. of. forming 20, and thus being able to compensate for even greater dimensional variations of the parts to be machined.3Q in the forming mass 20, in the vicinity of its free surface, additional. while still elastically compressible bodies such as those which are reproduced in Figure 6 in correspondence of 7.6, the bodies 76 consist of rubbery material resistant to high temperatures and are incorporated in spacer bodies 78 in the form of rods which retain the bodies 76 at a predetermined minimum distance from the surface of the forming mass 20. surface of the forming mass 20. there is no hole and that the compliance of the forming mass must not be at the expense of large local variations in mechanical strength. On the contrary, in the molding mass 20 there is an uninterrupted cover plate which, by means of the bodies 76 and the interposed column-shaped crosspieces of the molding mass,? supported by the volume of the forming mass. Thin glass fiber cables 80 extend through the bodies 76, connecting the different bodies 76 forming a lattice ? I._bodies 76 .are arranged in the plane of the lattice _ o._in..Conffizione.exagonal -or in packaging qua-, dratn__c.enirata-_nelltarpa, where, as ... through the._ durezaa_dei_c.o.rp. i._76_incorpo.rati, ._ the..ced_eyeness of the upper part of the molding mass can? be j like. variat L through the ratio between the mesh size of the net and the diameter of the bodies 76. In Figure 6, at 82? furthermore, the adhesive layer located between the decorative layer 32 and the surface of the workpiece 30 is still reproduced? Bench? pi? not better described above, it is understood that for the positioning of the pieces to be machined on the surface 36 of the last, joining systems with geometric constraints will be used easily. which can be loosened and manufactured, for example insertion means or positioning pins, to allow rapid replacement of the workpiece. It is also understood that the quantity? of the molding mass and the dimensions of the tank 12 will be harmonized with each other in such a way that the molding mass, in the presence of the usual variations of profile between different pieces to be machined, is not forced out. ? r? also sufficient to completely follow the profile of the piece to be machined. ... From the description given above, it notes that the forming mass is provided with the desired negative profile by forced insertion of a m of the positive and subsequent resolidification, in this regard not. ? is it necessary to bring the mass of mature form to the _licjuidpj state? it is sufficient that the molding be plastically deformable, here malleable or pasty. These plastic deformable states can be well established especially with thermoplastic synthetic materials. By closing the press, _xl_model positive will come? then firmly pressed into the molding mass, thus obtaining a very clear printed reproduction of the model ^ posici vq. ^ _