Abstract:
An automatic machine and an automatic method for the alternating application of a plurality of flexible spacer profiles, preferably made of expanded synthetic material, on a glass sheet in order to compose the insulating glazing, where a dynamic magazine, which contains a plurality of reels of flexible spacer profile is paired with an application head and the path of the flexible spacer profile lies around the rotation axis of the application head, thus rendering feeding from the magazine compatible, thereby allowing the alternability of the reels, with the functionality of the application head, which requires a 360° freedom of rotation.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    Currently it is known to deposit the rigid spacer frame or the flexible spacer profile on a glass sheet to then mate the assembly with a second glass sheet in order to constitute the so-called insulating glazing. The operation can be also repeated in order to obtain insulating glazing constituted by three glass sheets and two rigid spacer frames or flexible spacer profiles, as well as n glass sheets and n−1 rigid spacer frames or flexible spacer profiles. 
         [0002]    In order to better understand the configuration of the glass sheet, not so much in its possible isolated use, as especially in its use in combination with other components, in particular the rigid spacer frame or the flexible spacer profile to constitute so-called insulating glazing, hereinafter some concepts are summarized which relate to the semi-finished products. These are the glass sheet  2  and the rigid spacer frame  3  or the flexible spacer profile  3  and the final product, i.e., the insulating glazing  1 , assuming that the subsequent use of the insulating glazing, i.e., as a component of the door or window, is known. To the purpose of more clear description reference will be made to the final product, breaking it down into its components. 
         [0003]    The insulating glazing  1  is constituted by the composition of two or more glass sheets  2  separated by one or more rigid spacer frames  3 , which are generally hollow and microperforated on the face directed inward. The spacer frames contain in their hollow part hygroscopic material and the chamber (or chambers) delimited by the glass sheets and by the rigid spacer frame (frames), that is (are) able to contain air or gas, or mixtures of gases that give the double glazing unit particular properties, for example, thermal insulation and/or soundproofing properties. Recently, the use of a spacer profile  3  has become widespread which has an essentially rectangular cross-section, is made of flexible and elastic expanded synthetic material (by way of non-limiting example, silicone and/or EPDM) which incorporates in its mass the hygroscopic material. It is this type of profile on which the following description will focus. This profile has four advantages: the low coefficient of heat transmission by conduction; the bond with the glass, which becomes instantaneous because it is entrusted to the acrylic adhesive and not to the traditional thermoplastic sealant, which is subject to flow until the second sealant, described hereinafter, catalyzes; the state of supply in reels that contain lengths of a few hundred meters and therefore with greater feed endurance, differently from the profile for the rigid frame supplied in bars with a maximum length of 6 meters; and finally its applicability in automation. 
         [0004]    The connection between the glass sheets and the rigid spacer frame or frames is obtained by means of two levels of sealing: the first one having the function of providing tightness and the initial bond between these components and affecting the lateral surfaces of the frame and the portions of the adjacent glass sheets; the second one having the function of providing the final cohesion among the components and the mechanical strength of the joint between therm and affecting the compartment constituted by the external surface of the frame and by the faces of the glass sheets up to the edge thereof (see  FIG. 1 ). In the case of a flexible spacer profile  3  made of expanded synthetic material, and more precisely in the so-called “dual seal” version, the first level of sealing is replaced by an adhesive  5 , for example an acrylic adhesive, already spread on the lateral faces of the spacer profile  3  and covered by a removable protective film  5 ′ which is removed during the step of application on the glass sheets. In the “triple seal” version, in addition to the acrylic adhesive the profile comprises a portion intended also for hermetic sealing, but the present invention does not relate to this version. 
         [0005]    The glass sheets  2  used in the composition of the insulating glazing  1  can have different shapes depending on its use. For example, the outer glass sheet (outer being understood with respect to the building) can be standard or coated with so-called selective nanodeposits or with solar control (in order to limit the thermal intake during summer months), or laminated/armored (for intrusion/vandalism prevention functions), or laminated/toughened (for security functions), or combined (for example nanocoated and laminated in order to obtain a combination of properties). The inner glass sheet (inner being understood with respect to the building) can be standard or coated with so-called low-emissivity nanodeposits (in order to limit the dispersion of heat during winter months), or laminated/toughened (for security functions), or combined (for example nanocoated and laminated in order to obtain a combination of properties). 
         [0006]    From the simple summary given, it will be evident that a production line for obtaining the insulating glazing product  1  needs many processes in sequence and comprises in particular the application of the rigid spacer frame or flexible spacer profile  3 , considered as the main element in the present patent application. 
         [0007]    The processes for the production of the insulating glazing  1 , each requiring a corresponding and particular machine to be arranged in series with respect to the other complementary ones, are, by way of non-limiting example and at the same time not all necessary, the following: 
         [0008]    EDGING on the peripheral face of the glass sheet in order to remove any nanocoatings so as to allow and maintain over time the bond of the sealants and, in the case of the subject of the present disclosure, of the acrylic adhesive and of the sealant; 
         [0009]    CHAMFERING (in jargon arrissing) of the sharp edges of the glass sheet, both to eliminate edge defects introduced with the cutting operation (dangerous trigger sites for any fractures, particularly for the case of toughened glass, which therefore is always arrissed), and to reduce the risks of injury in the subsequent handling of the glass sheets and of the insulating glazing  1 ; 
         [0010]    WASHING of the individual glass sheets, with alternation of inner glass and outer glass sheet (the orientation being the one defined previously) or of inner glass sheet/intermediate glass sheets/outer glass sheet, or vice versa; 
         [0011]    APPLICATION OF THE SPACER FRAME: a previously manufactured frame, filled with hygroscopic material and coated on the lateral faces with a thermoplastic sealant that has sealing functions, in machines which are external with respect to the production line of the insulating glazing  1 , is applied on one of the two glass sheets that constitute the standard insulating glazing  1  in a dedicated station of the production line of the insulating glazing  1 . As an alternative, and this forms subject of the present invention, a continuous strip of flexible spacer profile  3  is unwound from a reel and applied to one of the two glass sheets until it forms a closed frame, directly built so as to adhere to the glass sheet, after removal of the protective film  5 ′ that covers the adhesive  5  (generally of the acrylic type), and on the same production line of the insulating glazing  1 ; 
         [0012]    MATING AND PRESSING of the glass sheet(s)/frame(s) assembly; 
         [0013]    FILLING WITH GAS of the chamber or chambers thus obtained, an operation which can be performed also during the mating cited before; 
         [0014]    SECOND SEALING, i.e., sealing of the perimetric edge of the insulating glazing  1  in order to provide a mechanical/chemical and therefore structural bond between the spacer frame  3  and the glass sheets  2 . 
         [0015]    The processes listed above can be performed by the respective machine in a semiautomatic or automatic manner. 
         [0016]    In particular, in the recent background art the deposition of the flexible spacer profile  3  made of expanded synthetic material occurs according to two modes: semiautomatic (i.e., with the intervention of the operator), typically on a tilting table which modifies its own arrangement from vertical, when it receives the glass sheet from the line, to horizontal arrangement, when the operator deposits the profile, with the aid of a guiding and scoring tool; or automatic (i.e., without the intervention of the operator), typically and preferably in a section that has a vertical arrangement like the production line of the insulating glazing  1 , without however excluding solutions with a horizontal arrangement. 
         [0017]    Searching of the prior art in the field describing machines and methods for applying the spacer profile on glass sheets has led to identification of the following related documents: EP 1 347 142 B1, both for method and device, with German priority DE 2002 102 12 359 A1 dated 20 Mar. 2002 and US equivalent US2003/0178127, patent owner Lisec Peter that is specific for the spacer profile made of expanded synthetic material; U.S. Pat. No. 6,148,890 dated 10 Jun. 1998 regarding a device, patent owner Lafond that is specific for the spacer profile made of expanded synthetic material; U.S. Pat. No. 4,769,105 with Austrian priority dated 1 Sep. 1986, related to a device, patent owner Lisec, regarding the application of a spacer profile on a glass sheet, but made of filled thermoplastic material; EP 1 650 396 B1, related to a device, with Italian priority TV2004A000117 dated 20 Oct. 2004, patent owner FOR.EL. BASE di Davanzo Nadia &amp; C. s.n.c., TV2009A000207 dated 22 Oct. 2009, related to a device and a method, patent owner For.El S. p. A.. 
         [0018]    These inventions described in such documents with the corresponding machines teach respectively: 
         [0019]    EP 1 347 142: how to control the tensile and shearing stresses in the flexible spacer profile proximate to the region of application on the glass; 
         [0020]    U.S. Pat. No. 6,148,890: the method of conduction of the flexible spacer profile to the glass sheet; 
         [0021]    U.S. Pat. No. 4,769,105: how to control the tensile stresses in the flexible spacer profile before feeding to the application head; EP 1 650 396 B1: the innovative way of conveying the spacer profile to the glass sheet, which allows the further invention that is the subject of the present application. 
         [0022]    TV2009A000207: how to make possible the alternable use of a plurality of flexible spacer profiles, a solution which is quite surpassed, in terms of innovation, by the invention to which the present application relates. 
         [0023]    Technical problems that are inherent in the background art described above are the following (all instead solved conveniently by the present invention): 
         [0024]    complexity of the operation for replacing the reel (both in the case of depletion and in the more frequent case of replacement of the type of the spacer profile  3 ); 
         [0025]    lack of production flexibility due to the complexity of the operation for replacing the reel; 
         [0026]    excessive length of the waste of spacer profile in the operation for replacing the reel; 
         [0027]    excessive expenditure of time in the operation for replacing the reel; 
         [0028]    impossibility to proceed with the replacement of the reel or of one of the reels of the magazine with guiding up to the application head while the head is operational, with the consequent need to interrupt the process for applying the spacer profile and therefore the process of the entire production line of the insulating glazing  1  every time it is necessary to change the spacer profile  3 ; 
         [0029]    the need to resort to a double application head, certainly in the case of triple insulating glazing  1  which has two spacer profiles of different type, in any case in order to reduce, albeit without eliminating, the time for replacement of the spacer profile; 
         [0030]    and, in the above mentioned situation, limitation to only two types of spacer profile; 
         [0031]    the need and difficulty of control of the tensile, compression and shearing stresses in the flexible spacer profile  3 , especially when the reel is fixed to the ground, both when it is in stand-by and when it is working, and therefore the distance between the reel and the glass sheet  2  is not only considerable but also variable, due to the translation of the application head. 
       SUMMARY OF THE INVENTION 
       [0032]    The main aim of the subject of the present application is therefore to solve the highlighted technical problems, eliminating all the drawbacks according to the cited background art and therefore devising a machine and a method that make it possible to deposit the flexible spacer profile  3  on the glass sheet  2  in an inexpensive, functional and reliable manner and especially comprising complete automation for changing the spacer profile, for example for alternating thicknesses or colors or thicknesses and colors or types or for depletion, particularly in the case in which it is required, within the scope of said insulating glazing  1 , because it is constituted by three or more glass sheets and of two or more spacer profiles of different types. 
         [0033]    This aim we find to be achievable by means of technical measures, set forth hereinafter, which differ from those of the background art, including the one that already resorts to the feeding of the application head with a plurality of flexible spacer profiles that come from reels which are contained in unwinding cabinets arranged on the ground (with humidity-controlled environment) and corresponding changing, obtained however only in a “semi-automatic” manner, i.e., still with human intervention, or the one TV2009A000207 that already performs automatic reel replacement, but with a completely different configuration. 
         [0034]    Such technical measures are: 
         [0035]    use of synchronous actuation with high torque (already present in TV2009A000207 of the same applicant and in any case not intended herein as an inventive aspect but as a complement) for the handling of the reels and corresponding entrained accessories (conditioning container) and entrained devices (unwinding spools, gripping and entrainment vices, et cetera); 
         [0036]    placement of the unwinders of the reels that contain the spacer profile  3  and corresponding means for control and feedback and removal of the film on carriages that move on sliders; 
         [0037]    distribution of the flexible spacer profiles along a path that winds around the rotation axis φ and is not extended along the rotation axis φ as done by the background art as discussed in the inventions of other inventors (therefore not in the case of the inventions of For.El.); 
         [0038]    pick-up of the reel and corresponding unwinding means, means for removing film and means for interfacing with the application head, from its standby position, by the working head (applicator) and other means and coupling thereto in order to constitute a unit which is integral (application head plus reel and means described above) with respect to the vertical axis (described hereinafter). 
         [0039]    The present invention relates to an automatic machine and an automatic method for the alternable application of a plurality of flexible spacer profiles, preferably made of expanded synthetic material, on a glass sheet to compose the insulating glazing, as set forth in claims  1  and  11 . 
         [0040]    The invention uses the innovative pairing of two or more shuttles, each one containing a reel of flexible spacer profile and an application head. The path of the flexible spacer profile runs around the rotation axis of the application head, thus rendering compatible feeding which can be alternated from one reel to the other, maintaining the functionality of the application head, which requires a rotational freedom of 360°. 
         [0041]    This aim and these and other objects which will become more apparent hereinafter are achieved by an automatic machine for applying a flexible spacer profile, preferably made of expanded synthetic material, on at least a first glass sheet designed to subsequently mate with at least one second glass sheet so as to compose the insulating glazing, the machine comprising: conveyors with a substantially vertical arrangement which include conveyance devices provided with support and traction means which act on the lower edge of a glass sheet and with synchronous transmission means which are provided so as to act on a face of the glass sheet along a horizontal axis by way of a synchronous motor thereof; a carriage with a synchronous translational motion along a vertical axis, that is actuated in motion by way of a synchronous motor thereof and is provided with an application head with a synchronous rotary motion along a rotational axis defined by a shaft actuated by means of a further synchronous motor of said carriage; and wherein said head accommodates means for synchronous traction actuated by way of synchronous motors and means for guiding the spacer profile that arrives from a reel the unwinding of which is actuated in an adjusted manner, characterized in that it comprises a plurality of reels, a reel which contains a flexible spacer profile, being one of said plurality of reels, and in that each reel of said plurality of reels is provided with a corresponding unwinding unit, with a corresponding optional auxiliary unit and a corresponding transfer unit, containing and guiding the flexible spacer profile, said units constituting a respective feeder assembly for a respective said reel which contains the flexible spacer profile, and which is arranged on a magazine which is constituted, for example, by a footing provided with movable sliders on which a said feeder assembly can be coupled and can be uncoupled and guided to said application head, said application head, by way of said carriage, engaging a respective one of said feeder assemblies by way of engagement means such as bushes which mate with pins being actuatable for said sliders; in that a guiding or spacing of the flexible spacer profile to and from the synchronous traction means of the application head for changing a reel is performed by way of said transfer unit that can be for example of a type with jaws which constitute grippers, moved by a pneumatic or electric actuator, said application head being provided with its own said synchronous traction means, and the flexible spacer profile being fed to the glass sheet along a path that winds around the rotation axis of the application head. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0042]    Further characteristics and advantages of the present invention will become better apparent from the following detailed description of a preferred but not exclusive embodiment of an automatic machine, illustrated by way of non-limiting example by means of the accompanying drawings, wherein: 
           [0043]      FIGS. 1A-1H  are schematic views of the peripheral portion, and details thereof, of the insulating glazing unit  1  in a non-exhaustive exemplifying series of possible combinations:  1 A standard;  1 B triple glazing unit with inner glass sheet of the low-emissivity type;  1 C staggered glass sheets, both coated, respectively the inner one of the low-emissivity type and the outer one of the selective type;  1 D laminated outer glass and low-emissivity inner glass;  1 E hardened reflective outer glass sheet and laminated low-emissivity inner glass sheet;  1 F triple glazing unit with inner glass sheet of the low-emissivity type and spacer frames that have a different width between one gap and the other.  FIGS. 1G and 1H  show a spacer profile made of synthetic material, with adhesive lateral faces. 
           [0044]      FIGS. 2 ,  3  and  4  are respectively, main views of the machine. 
           [0045]      FIG. 2  is a front view including the assemblies: for horizontal runway x, and for vertical runway y; 
           [0046]      FIG. 3  is a general side view of the assemblies: for vertical runway y with vertical carriage  200 , application head  300  with rotation axis φ, reel movement assemblies; 
           [0047]      FIG. 4  is a complete plan view of rear electrical panels. 
           [0048]      FIG. 5  is a view of the main components of the inventive part of the machine divided into units and the part of the known components interfaced with the inventive ones, also divided into units. 
           [0049]      FIG. 6  is a view, from the operator side, of part of the unit series  200  (y axis) and of part of the unit series  300  ( 100  axis), in principle as already available from the background art (EP 1 650 396 B1), but in the version compatible with automatic reel changing, particularly including the engagement means  203   a, b, c  of the supply assembly defined previously, so as to jointly connect the supply assembly with the carriage  201  of the unit  200 . 
           [0050]      FIG. 7  is a view, taken from the side of a glass sheet, in working, of the unit series  300 , in principle as already available from the background art (EP 1 650 396 B1), but in the version compatible with automatic reel changing, particularly showing its interfacing in the condition of initial takeup of the spacer profile  3  toward the feeder assembly. 
           [0051]      FIG. 8  is a view showing the unit series  400 , in principle as already available from the background art (EP 1 650 396 B1), but in the version compatible with automatic reel changing  401 , particularly showing its interfacing with the carriage  201  for the movement of the feeder assembly for approach to (and activation of) the application head and for spacing from the application head so as to swap reels. 
           [0052]      FIG. 9  is a view showing the unit series  500 , in principle as already available from the background art (EP 1 650 396 B1), but in the version compatible with automatic reel changing and therefore in turn movable jointly with the units  400  and  600 , since it can be interfaced with the carriage  201  cited above. 
           [0053]      FIG. 10  is a view illustrating the new and inventive unit series  600 , in which its essential components are referenced and which relates to the movement for feeding the flexible spacer profile  3  from each one of the reels of the magazine series  400 , through the unit  500  to the application head series  300 . Logically, this unit also is integral with the carriage  201  cited above. The operating condition shown in this figure is with the application head  300  that performs the process of deposition of the spacer profile  3  on the glass sheet  2 , and therefore the feeding of the spacer profile  3  to the application head  300  has already occurred and the feeding mechanisms  601 ,  602  and corresponding actuators are in the inactive condition. 
           [0054]      FIG. 11  is a view illustrating a further part of an inventive aspect of the present invention, i.e. shows the footing, which contains at least two carriages, which are moved by means of gearmotors and on which the units  400 ,  500 ,  600  are coupled, that constitute the feeder assembly (which for the sake of convenience is shown raised so as to show the centering pins and the locking mechanism according to the description), adapted to feed the application head series  300  with the spacer profile  3  with the possibility to alternate the reels and therefore the types of spacer profile  3 . 
           [0055]      FIG. 12  is a view showing the constructive details of the footing  701  and of the carriages  702   a,    702   b  for moving the feeder assemblies and numbers them in detail. 
           [0056]      FIGS. 13 and 14  are views illustrating the operating conditions of interaction between the feeder assembly ( 400 ,  500 ,  600 , omitting only the part  600  in  FIG. 14 ) and the application head  300 . 
           [0057]      FIGS. 15 and 16  are views illustrating the conditions for gripping the end of the spacer profile  3  before its transfer and after transfer has been completed from the feeder assembly (combination of the units  400 ,  500  and  600 ) to the synchronous traction means  304   a  and  304   b  of the application head  300 . 
           [0058]      FIG. 17  is a view of the system for coupling the feeder assembly (combination of the units  400 ,  500  and  600 ) to the vertical carriage  201  of the series  200  and of the system for coupling the feeder assembly (combination of the units  400 ,  500  and  600 ) to the slider of the reel magazine. In order to identify and describe these systems, the numberings take the series  200  if applied to the carriage  201  and the series  700  if applied to the magazine. The unit  600  is shown spaced from its natural position only to show engagement means, such as bushes  203   a, b, c  and pins  709   a, b  used for coupling a respective feeder assembly  400 ,  500 ,  600  to the carriage  201 . The apparent interference on the left part, therefore, should be ignored. 
           [0059]      FIG. 18A  is a perspective view illustrating an example of insertion of the machine in the production line of the insulating glazing  1  and does not include: electrical/electronic panel, control post and protection devices. 
           [0060]      FIGS. 18B-18E  show glass sheets, with different shapes that can be used for insulating glazing made according to the invention. 
           [0061]      FIG. 19  is a plan view illustrating an example of insertion of the machine in the production line of the insulating glazing  1  and includes: electrical/electronic panel, control post and protection devices. 
       
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0062]    We now provide a detailed description of a way of carrying out the invention with reference to the enclosed figures. 
         [0063]    Generally,  FIGS. 1A ,  1 B,  1 C illustrate the solution with conventional rigid spacer frame  3  made of microperforated hollow metal or microperforated hollow plastic or composite material containing the hygroscopic material  4  (or desiccant material), and the two types of sealant used are highlighted: in black the butyl sealant  6 , which has the function of initial bond between the components and of seal (first seal) applied between the lateral surfaces  3   p  and  3   s  of the frame and the glass sheets  2 , in dashed lines the polysulfide or polyurethane or silicone sealant  7 , which has the function of mechanical strength (second sealing) applied between the outer surface of the spacer frame  3  and the faces of the glass sheets  2  up to the edge thereof.  FIGS. 1D ,  1 E,  1 F show the solution with the spacer frame obtained by means of a flexible spacer profile  3  made of expanded synthetic material of the “DualSeal” type spread with adhesive  5  (with the function of first seal, although the term is imprecise because it is an adhesive that has no tightness capacity, its functions being rather the advantageous and effective ones of immediate bonding between the spacer profile and the glass sheets), protected with a film  5 ′ which is removed before application on the glass sheet  2 , and show the sealant  7  which constitutes the second seal, which is generally obtained with so-called hot melt or reactive hot melt but also with polysulfide or polyurethane or silicone. In  1 D and  1 F, which again refer to the spacer profile of the “DualSeal” type, the numeral  8  designates the gas (which is logically not visible) contained in the chamber delimited by the spacer frame  3  and by the glass sheets  2  (gas which of course can be present also in all the other configurations of  FIGS. 1A-1F ). 
         [0064]    The internal/external orientation is visually identified with icons that represent the sun (outer side) and the radiator (inner side). These  FIGS. 1A-1F  clearly show the importance of the spacer frame in the composition of the insulating glazing  1 , especially in the embodiments in which the thicknesses of the glass sheets  2  are considerable and accordingly so is the weight (in the case of laminated glass sheets). Therefore the use of the spacer profile  3  made of expanded synthetic material, (see  FIGS. 1G-1H ), whose lateral faces  3   p  and  3   s  are spread with very effective acrylic adhesive  5 , is particularly valid, because it allows the instantaneous bonding of the glass sheets  2  with the spacer  3 , already after mating, differently from the butyl sealant alone as in the conventional technique with spacer profile made of metallic material or plastic, in which this bond is entrusted, while waiting for the catalysis of the binary sealant  7 , exclusively to the butyl sealant  6 , which is thermoplastic and does not bear loads but is subject to viscous flow (a critical aspect especially in the composition of the insulating glazing obtained with three glass sheets and two spacer frames for which the central glass sheet is not supported in know conveyors of the sealing machine). Moreover, the flexible spacer frame made of expanded synthetic material has a conductivity coefficient that is far lower than that of the metallic rigid spacer frame, leading to higher-performing characteristics of thermal insulation of the insulating glazing. And finally, as already said, the flexible spacer profile is provided in reels which contain a few hundred meters, thus increasing substantially the endurance of the product fed to the machine. 
         [0065]    However, such flexible spacer made of expanded synthetic material, supplied in reels, needs to be replaced at each variation of the type of profile required by the production program or upon depletion of the reel contents. In particular, in the execution of triple insulating glazing the solution of the flexible spacer, indeed because it is supplied in reels, up to the solution according to the present invention, would be inconvenient with respect to the rigid frame solution, because it would not allow the execution of the two chambers with different gap dimensions. 
         [0066]      FIGS. 2 ,  3  and  4  have the main purpose of defining the arrangement of the axes of the main actuation systems x, y, φ according to the background art. As regards the movement axes of the reel units away from and toward the application head, the three figures represent in their combination the principle of interfacing between reels from the reel magazine and the application head  300 , referring to more detailed figures for the constructive details. The figures refer to a machine in which the workflow occurs from right to left. 
         [0067]    The numbering logic of the figures is as follows: series  200  for the vertical runway with vertical carriage (y axis); series  300  for the application head (φ axis), series  400  for the reel actuation unwinding units, including the unit, series  700 , for the movement thereof, the movement being related also to the two subsequent units, series  500  for the film takeup unit, series  600  for the transfer unit (the interface mechanisms) between the series  400 - 500  and the series  300 . The units  400 ,  500  and  600  constitute respective feed assemblies, each of which is either stored in the reel magazine or coupled to the carriage  201  for the application of the spacer profile  3  to the glass sheet  2 . In summary, an inventive part is constituted by the units  600  and  700 , the known part is constituted by the units  200 ,  300 ,  400 ,  500 , in addition to the unit  100 , which is not shown in  FIG. 5  but can be inferred from  FIG. 2 . The same figure shows the path of the flexible spacer profile  3 , in the condition for starting the process for application to the glass sheet  2 , coming from one of the a plurality of reels (two in the example of the other figures, but to be understood as at least two). The same figure also clearly shows the initial accumulation of the flexible spacer profile  3 , slightly tensioned by winding around the free rollers ( 303   a - 303   d ), the first of which can oscillate in order to avoid situations of interference between components of the head  300  and components of interface mechanisms such as transfer unit  600 , the accumulation allowing the subsequent rotation of the head through 360° to be performed in four steps in the case of rectangular glazing or in a progressive or combined manner in the case of shaped glazing. This accumulation, combined with the control logic that drives the control of the reel, makes it possible to avoid abnormal tensions in the spacer profile during the rotational transients of the head. This accumulation, in its initial setting position with no reserve of product, enables to arrange the jaws (movable jaw  601  and fixed jaw  602 ) that constitute the hold grippers of the transfer unit  600  downstream of the reels and the corresponding unwinding, control and feedback means and downstream of the film takeup means and upstream of the application head, thus allowing automation for taking the flexible spacer profile  3  from one of the a plurality of reels and guiding to the synchronous traction means  304   a  and  304   b  (illustrated hereinafter in  FIG. 7 ) of the application head  300 . One or optionally more of the free rollers  303   a - 303   d,  as already mentioned, are different from those of the background art in order to allow interfacing with the innovative part of the present invention. 
         [0068]    In order to describe an exemplary, but not limiting, way of carrying out the invention, reference will be made to  FIGS. 2 ,  3 ,  4 ,  18 A and  19  which include inventive parts of the present invention and to  FIGS. 5 to 17  for description of further details. 
         [0069]    Features of  FIGS. 2 ,  3  and  4  that are not described herein are assumed to be known and therefore not requiring detailed description, since they belong both to the prior art described previously and to the knowledge of the person skilled in the art. Nothing is described, for example, in relation to the structure related to synchronous horizontal axis x and the corresponding mechanisms for the grip (by means of a sucker or suckers  101 ), the synchronous conveyance of the glass sheet, in relation to the synchronous vertical axis y and corresponding mechanisms and in relation to the synchronous axis φ and corresponding mechanisms, since these are configurations that are well-known in the field of machines for manufacturing insulating glazing. 
         [0070]    Reference numerals below ten (1 digit) refer to the material being processed, while, as already explained and used previously, numerals with 3 digits refer to the components of the machine and numerals ending with two zeros refer to each unit of the machine The numerals with 4 digits are used to designate the machines upstream and downstream of the machine (designated by the numeral  1000 , as the main one) to the present invention refers. 
         [0071]    In particular, the flexible spacer profile made of expanded synthetic material is designated by the reference numeral  3 , without precluding the operation of the machine also with spacer profiles made of a different material, so long as it is compatible with the mechanisms that will be described hereinafter. The reference numeral  2  designates the glass sheet [of the two or more, particularly the one or the ones (in the case of insulating glazing composed of more than two glass sheets) affected by the application of the flexible spacer profile  3 ]; the reference numeral  1  designates the insulating glazing. These numberings have already been used in the previous chapters by referencing the evidence of such use. 
         [0072]    Two-digit numbers are also used as follows: the numeral  11  designates the electrical/electronic panel, the numeral  12  designates the control and interface post and the numeral  13  designates the protective structures, be they of the type of mechanical covers or optical barriers or laser barriers or electrosensitive mats et cetera, because particular attention is dedicated, in addition to the structural, functional, economic and ergonomic aspects, which are peculiar to the contents of the present invention, also to the aspects related to the prevention of accidents (more broadly, HSW: Health &amp; Safety &amp; Wellness in the work environment). 
         [0073]    A preferred but not exclusive way of carrying out the invention will be described hereinafter. 
         [0074]    A premise that concerns orientations, only for the purposes of the present description, should be kept in mind: when the term “vertical” is used, “slightly inclined with respect to the vertical” is actually intended. In fact, the conveyance of the glass sheet occurs on conveyors, the resting plane of which is “slightly” inclined with respect to the vertical by approximately 6 degrees. Likewise, the lower supporting/transport rollers and belts have an axis inclined by approximately 6 degrees with respect to the horizontal plane, and therefore when the term “horizontal” is used, “slightly inclined (by approximately 6°) with respect to the horizontal” is intended. 
         [0075]    The known part of the machine (discussed in detail for example in EP 1 650 396 B1 of the same inventor as the present application) is described initially, but only in its essential aspects. The new and inventive part is thereafter described. 
         [0076]    A glass sheet  2  that arrives from a previous processing machine  4000  (see  FIG. 18A ) is either loaded manually or by means of a loader onto the input conveyor of the machine to which the present invention relates. The glass sheet  2  moves forward, conveyed by supporting and traction rollers in the first part and by the supporting and traction belts in the second part ( FIGS. 2 ,  3 ), up to a slowdown sensor and to a stop device, both known, so as to position the glass sheet  2  and allow the beginning of the process of application of the flexible spacer profile  3  against the glass sheet  2 . The head assembly  300 , which can move vertically ( FIGS. 2 and 6 ) because it is applied to the vertical carriage  201 , through the action of a synchronous motor  202  and of a reduction unit, which actuate a pinion which acts on a rack and through the actuation of another synchronous motor  302  which acts by means of adapted transmission elements on the rotation of the hollow shaft  301 , has been arranged before hand in the process start step. 
         [0077]    The spacer profile  3 , guided through the series of free rollers  303   a - 303   d  and additional likewise free rollers shown in  FIGS. 5 and 7 , which interact with the faces of the profile that lie at right angles to the plane of the glass sheet  2  and by means of series of free rollers also contrasted by complementary rollers which are also free where indicated in the figures, interacting with the faces of the flexible spacer profile that lie parallel to the plane of the glass sheet  2 , such spacer profile being engaged with the belt driving device  304   a  and  304   b  actuated by synchronous motors  305   a  and  305   b,  is pushed by the wheel  306  against the glass sheet  2 , after axial approach of the head  300  performed by means of a motor and a reduction unit which interact on a mechanical transmission, guides and sliders which are shown, albeit partially, in  FIG. 5 . 
         [0078]    At this point the synchronized motion of the glass sheet  2 , actuated by synchronous transmission means  101  with a synchronous motor  102  ( FIG. 2 ) that acts by means of a reduction unit and mechanical transmission of the pinion/rack type on a sucker which can move on a carriage and guides (and through the action of a parallel mechanical conveyor with rollers and/or with belts which acts on the lower edge  2   a  of the glass sheet  2 ) and the synchronized motion of the belt transmission device  304   a  and  304   b  produce the mutual flexible spacer profile/glass sheet path that corresponds to the first lower side  2   a  of the glass sheet  2 . In order to allow the application of the flexible spacer profile  3  against the glass sheet  2  without the various devices of the head  300  contrasting the glass sheet  2  and the spacer profile  3 , the arrangement of the head is slightly inclined with respect to the plane of the glass sheet  2  and the head is provided with the axial motion described previously in order to eliminate interference with the flexible spacer profile  3  once it has been applied, as shown in the various figures. In this step, the reel  401  ( FIGS. 5 and 8 ), the rotation of which is actuated by the non-synchronous motor  402 , which acts by way of the reduction unit  403 , provides the flexible spacer profile  3  on demand because the motor  402  is fedback by the position of the dandy roll  404  which interacts with the potentiometer  405 , which are arranged downstream of the unwinder of the reel, for the aim of greater functionality in the unit  600  ( FIGS. 10 ,  13 ,  14 ). The dandy roll  404  and the potentiometer  405  perform feedback and fine control, while the sensor  406  supplies information on the diameter of the reel for the coarse control of the peripheral speed range of the reel. Also during this step, the films  5 ′ ( FIG. 1G ) that protect the lateral faces of the spacer profile  3  are conveniently removed from the winders  501   a  and  501   b  actuated by the respective motors  502   a  and  502   b  coupled directly thereon, the electronic actuation of which is simply with torque control ( FIGS. 9 and 13 ). Feelers  503   a  and  503   b,  which interfere with the films, stop the machine in case of breakage or otherwise of malfunctions affecting the films. More conveniently, as an alternative to the feelers, as shown in  FIG. 9 , sensors  503   a  and  503   b  are used which detect the overspeed of the winders or of one of the winders when they are no longer contrasted by the traction of the film because it is broken. 
         [0079]    The management of the position of the glass sheet  2 , particularly of its initial placement, is fundamental for the correct functioning of the process performed by the head  300 , both in the rectangular version and in particular in the shaped version, for coordinating the horizontal movement of the glass sheet  2  and the vertical movement of the vertical carriage  201  that carries the head  300 . In the case of a glass sheet  2  having a rectangular shape, one or more sensors (known and therefore not shown) detect the position of the edge of the glass and, by means of the logic of the PLC, give information that is useful for following the rectangular perimeter of the glass sheets  2 , respectively for the actuations of the traction rollers, of the traction belts, of the sucker  101  for horizontal movement x, or for the actuation of the vertical movement of the vertical carriage  201  and for the actuation of the belt driving device  304   a  and  304   b  ( FIG. 7 ). In the case of a glass sheet  2  that has a contoured shape, i.e., a nonrectangular shape, the information related to its shape is entered electronically with known techniques, and besides the actuations described earlier, which act on the synchronous motors for actuating the traction of the glass sheet  2 , the movement of the vertical carriage  201  and the traction of the spacer profile  3  (by means of the traction devices  304   a  and  304   b ), the actuation of the synchronous motor  302  that actuates the rotation of the head  300  about the axis φ is also involved so that the four motions, horizontal x of the glass sheet  2 , vertical y of the head  300 , rotary φ of the head  300 , translatory of the belts  304   a  and  304   b,  are electrically/electronically linked in order to follow the shape of the glass sheet  2 . 
         [0080]    Once the execution of the first lower side  2   a  of the glass sheet  2  has ended, the head  300  performs a rotation as a whole (through 90° in the case of the rectangular sheet according to the present first description), due to the action of the synchronous motor  302 , the reduction unit, the toothed belt transmission, which act on the hollow body  301  of the head  300 . As a consequence, the flexible spacer profile  3  has an orientation which is parallel to the second side  2   b  of the glass sheet  2  which has a vertical arrangement. This step of rotation entails both a restitution of the flexible spacer profile  3  and a demand of the films  5 ′ which respectively: the reel actuation assembly or unwinding unit  400  will take up, since the motor  402  is reversible, by means of the signal of the dandy roll  404  and the corresponding inverse feedback provided by the potentiometer  405 , while the film takeup unit  500  will return the films  5 ′, the corresponding motors  502   a  and  502   b  with torque control being able to reduce the torque until they become free, or rather still slightly actuated in order to maintain a minimum preloading on the films  5 ′. 
         [0081]    For the deposition of the flexible spacer profile  3  on the vertical side  2   b  of the glass sheet  2 , the sequences described for the side  2   a  are repeated, except that instead of the glass sheet  2  being translated horizontally along the axis x, the head  300  translates vertically along the axis y by means of the actuation that acts on the synchronous motor  202  that actuates the slider  201 . 
         [0082]    It goes without saying that the continuation of the sequences for completing the deposition of the spacer profile  3  on the glass sheet  2  along the remaining part of the perimeter (sides  2   c,    2   d ) is merely the alternation of the steps described for the sides  2   a  and  2   b.    
         [0083]    Likewise, all the operations and corresponding devices for the prismatic die-cutting of the spacer profile  3  at the positions that will become corners of the spacer frame and for the final die-cutting for parting, performed by the blade  307  at what will become the last corner, are assumed to be known (as detailed in EP 1 650 396 B1). 
         [0084]    Obviously, all the movements connected to the steps of the cycle are mutually interlocked, by the aid of a logic system which is parallel but always active, in order to avoid, during the process, conditions of mutual interference between actuation elements and material being processed and in order to control the safety functions of the machine, even in case of interruption of the electric and/or pneumatic supplies. 
         [0085]    At this point a description of a preferred but not exclusive embodiment of an inventive part of the present invention is hereinafter provided. 
         [0086]    In a configuration of the application head, as known only from EP 1 650 396 B1, is combined a spacer profile  3  that winds the end part of the application head  300  by means of the series of rollers  303   a - 303   d  while it does not cross the hollow shaft  301  that supports the head  300 , to a feed that no longer comes from a single reel but from a plurality of reels, which are arranged in their inactive position on a deck which is fixed to the floor. The reels are coupled alternately to the vertical carriage  201  in their active position, i.e., for feeding the application head  300  in the step of deposition on the glass sheet  2 . 
         [0087]    In the devices according to EP 1 347 142 B1, U.S. Pat. No. 4,769,105, related to machines for applying spacer profiles, a combination such as the one described in the previous paragraph is not applicable because in the devices disclosed the flexible spacer  3  is guided to the glass sheet  2  through the hollow shaft  301  of the head  300  that identifies the axis φ that is visible in  FIGS. 3 ,  6  and  7 , and the hollow shaft could not contain, even if built with large dimensions, the mechanisms for feeding alternately different flexible spacer profiles to the glass sheet  4 , instead, but because in the cited known devices the feeding occurs along a direction at right angles to the glass sheet  2 , alternability would be possible only by means of a manual process. In EP 1 650 396 B1, instead, since the feeding of the flexible spacer profile  3  occurs along a plane which is pseudo-parallel to the glass sheet  2 , it is possible to reach, with the mechanisms of the unit  600  for transferring the spacer profile  3  from the known units,  400  for unwinding and  500  for removing films, up to the vicinity of the traction mechanisms  304   a,    304   b  of the application head  300 . With respect to this last device, the presently disclosed invention adds new and inventive aspects. Likewise, it is a new and inventive improvement with respect to TV2009A000027, since the type of the magazine is completely different. 
         [0088]      FIGS. 5 ,  7  and  10  to  17  are used herein as an aid for the description of an inventive part of the present invention, with the following comments. 
         [0089]      FIG. 5  illustrates the condition of initial application of the flexible spacer profile  3  on the side  2   a  of the glass sheet  2 , which is obtained from the conditions of  FIG. 7  (conditions after capturing the spacer profile  3  fed by the feeding mechanisms of the unit  600  to the traction mechanisms  304   a ,  304   b  of the unit  300  and made to advance to the set sensor  308 , aligned with the blade  307  for the final cutting of the spacer profile  3 , as shown in  FIG. 7 ) and after having performed a rotation through 360° of the application head about the axis φ in a clockwise direction (reference with the shoulders on the glass sheet). The conditions of end of the application are the same as in  FIG. 5 , but after the application head  300  has performed a counterclockwise rotation through 360° (reference with the shoulders on the glass sheet). 
         [0090]      FIGS. 15 and 16  are views, respectively, of the condition of waiting to transfer the flexible spacer profile  3  on the part of the extension  600  of the feeder assembly (combination of the units  400 ,  500  and  600 ) to the conveyors  304   a,    304   b  and of completed transfer. Both figures are views from the side of the glass sheet (i.e., with the shoulders resting on the sliding plane of the glass sheet  2 , illustrated in  FIG. 2 ).  FIGS. 10 to 17  contain the details and the corresponding numberings of inventive parts. 
         [0091]    The operation for the replacement of a flexible spacer profile  3  with another flexible profile, designated by  3 ′ to make a distinction, is hereinafter disclosed as occurs in succession, with reference to the situation in which this occurs once the laying of the previous flexible spacer profile  3  on a glass sheet  2  has been concluded in order to form the insulating glazing  1  together with one or more other sheets  2 . It should be noted preliminarily that in order to better illustrate the functional steps, when reference is made to the movements obtained by the action of pneumatic actuators (hereinafter termed merely cylinders), the following nomenclature shall be used: positive stroke is the one obtained by introduction of compressed air in the chamber without the stem of the pneumatic cylinder; negative stroke is the one obtained by introduction of compressed air in the chamber with the stem of the pneumatic cylinder. 
         [0092]    The operation is as follows: 
         [0093]    the head  300  is in the conditions for receiving the subsequent spacer profile  3 ′, because the vertical carriage  201  is arranged in the lower zero position, and in the condition of alignment between the plane of the lower conveyor of the two conveyors  304   a,    304   b  that act proximate to the lower side  2   a  of the glass sheet  2  and the upper plane of the fixed jaw  602 , as shown in  FIG. 7  (assuming that the application head  300  is coupled to the carriage  201  which has moved down to its lower stroke limit), but still with the previous spacer profile  3  present in the traction elements  304   a,    304   b  and extended to the final cutting blade  307  and sensor  308 ; 
         [0094]    the rollers  303   a - 303   d  do not contain in their envelope the spacer profile  3 ; 
         [0095]    the flexible spacer profile  3  is extended, as mentioned previously, up to the crossing of the traction elements  304   a,    304   b  and up to the reference of the blade  307 , and the corresponding sensor  308  for example of the fiber-optic type, which has performed the final cutting of the spacer profile  3  applied to the glass sheet  2  in order to constitute the previous insulating glazing  1 , as a position of readiness to perform the application cycle on the glass sheet  2  in order to constitute the subsequent insulating glazing  1 , a situation which occurs in the series production of insulating glazing units  1  all composed with the same type of spacer frame  3 , albeit with any shapes and dimensions of the glass sheets  2 ; 
         [0096]    one cancels this preset, which would be the one for starting the cycle for the production of a subsequent insulating glazing  1 , if it had the same type of spacer profile  3  as the previous insulating glazing  1 , in order to reproduce it exactly but with a new flexible spacer profile  3 ′, and this is done as follows; 
         [0097]    reverse actuation of all the motor drives involved in the movement of the flexible spacer profile and precisely: the motor  402  ( FIG. 8 ); the motors  502   a,    502   b  ( FIG. 9 ), even if this occurs simply by reducing the torque and leaving the films  5 ′ to actuate the reverse rotation of the winders  501   a,    501   b  and therefore of the motors; the motors  305   a,    305   b  that actuate the traction elements  304   a,    304   b  ( FIG. 7 ); 
         [0098]    in these conditions, the flexible spacer profile  3  is rewound on the reel  401  and the film  5 ′ taken from the winders  501   a,    501   b  is redistributed, albeit coarsely, on the sides  3   p,    3   s  of the same spacer profile  3  starting from the initial condition in which the sensor  308  (generally of the fiber-optic type) arranged on the application head, at the known blade  307  for the final cutting of the spacer profile, has kept control of the position of the trailing part of the flexible spacer profile  3  in its alignment and, upon emission of its signal of confirmation the motors  305   a,    305   b,  which are synchronous and therefore measure the movements, which actuate the traction elements  304   a,    304   b , activate the takeup of the spacer profile again by retaining it between the transmission belts (which are visible and numbered in  FIG. 7  as  304   a, b ) until the cantilevered part thereof with respect to the fixed jaw  602  corresponds to such a value that subsequently (as described hereinafter) it retracts because it is aligned with the end part of the fixed jaw  602 , due to the action of the positive stroke of the cylinder  607  that moves the movable jaw  601 , so as to avoid any interference between the spacer profile  3  and the application head  300 ; 
         [0099]    during all the previous steps, the movable jaw  601  was in the open position with respect to the fixed jaw  602  due to the action of the cylinder  604 , which had performed its negative stroke, the slider  606  was in the advanced position with respect to the application head  300  due to the action of the pneumatic cylinder  607  that had performed its negative stroke, and the plate  605  in a spaced position with respect to the application head  300  by rotation of the arm  608  actuated by the pneumatic cylinder  609  that had performed its positive stroke and therefore the application head  300  was free to rotate for the functions of laying the spacer profile  3  against the glass sheet  2 ; 
         [0100]    at this point the plate  605  is moved adjacent to the application head  300  (as shown in  FIGS. 7 ,  13 ,  14 ) due to the action of the cylinder  609 , which performs its negative stroke, making the arm  608  rotate and the movable jaw  601  is therefore closed against the fixed jaw  602  due to the action of the pneumatic cylinder  604 , which performs its positive stroke, making the arm  603  rotate, then the movable jaw  601  is moved away from the extrusion head  300  due to the action of the pneumatic cylinder  607 , which performs its positive stroke, thus moving away the end portion of the spacer profile  3  from the synchronous transmission means  304   a,    304   b  and other bulks of the application head  300 , thanks to the high friction of its active surface and the low friction of the sliding surface of the fixed jaw  602 ; 
         [0101]    then the feeder assembly constituted by the units  400 ,  500  and  600  and the spacer profile  3 , for its part wound around the reel  401 , and for its unwound part up to the retention jaws  601  and  602  present therein, are disengaged from the application head  300  and can be guided to the standby position of the magazine series  700 , after rotation of the lever  608  actuated by the cylinder  609  in order to avoid interference with the carriage  201 ; 
         [0102]    this is obtained by activating the following additional mechanisms: lowering of the vertical carriage  201  so that after the resting of the plate  702   a ′ for supporting the feeder assembly  400 ,  500 ,  600  against the standby plate  702   a  arranged in the position for receiving the plate  702   a ′ the additional downward stroke of the carriage  201  entails the disengagement of the engagement means that can be provided in a non exclusive embodiment, as supporting bushes  203   a, b, c  that belong to the carriage  201  from corresponding pins  709   a  which are jointly connected to the plate  702   a ′ ( FIG. 17 ); activation of the locking device  710   a  activated by the cylinder  711   a  so that the butterfly  712   a  jointly connects the plates  702   a  and  702   a ′ ( FIGS. 11 and 17 ); actuation of the motor  708   a  which, by means of the reduction unit  707   a,  the pinion  706   a  and the rack  705   a,  moves the feeder assembly  400 ,  500 ,  600 , moving it away from what was the position for engagement with the application head  300  to the standby position of the magazine  700 ; the movement of the plate  702   a  when unloaded and of the assembly of the plate  702   a,  the overlying plate  702   a ′ with corresponding feeder assembly  400 ,  500 ,  600  is limited by slowdown and stopping sensors in the two directions of motion; 
         [0103]    once a feeder assembly is in its stand-by position, the other feeder assembly, due to the action of all the similar corresponding mechanisms numbered from  702   b  to  712   b  can migrate from the standby position to the active position, i.e., the position for engagement with the application head  300 , in order to actuate the manufacturing process of the insulating glazing  1  not with the spacer profile  3  now (for example with dimensions of 5 mm×12 mm and colored black) but with the spacer profile  3 ′ (for example with dimensions 5 mm×20 mm and colored gray); 
         [0104]    for the engagement of the new feeder system with the application head  300  all the mechanisms of the slider  201 , the mechanisms of the components of the assemblies  400 ,  500 ,  600 , as well as the mechanisms of the components of the application head  300  perform the reverse steps with respect to the ones described originally. In particular, the sensor  308  (generally of the fiber-optic type) stops the actuation motors of the translation units  304   a,    304   b  so that the head of the new spacer profile  3 ′ stops in a precise position for starting the application on the lower side  2   a  of the glass sheet  2 ; 
         [0105]    at this point the application head  300  rotates clockwise through 360° (reference with the shoulders on the glass sheet), so as to accumulate along the path defined by the free wheels  303   a,    303   d  the quantity of spacer profile  3  adapted to allow the rotation of the application head in following subsequently the perimeter of the glass sheet  2 . 
         [0106]    The present preferred embodiment of the invention is susceptible of numerous constructive variations (with respect to what can be inferred from the drawings, the details of which are obvious and eloquent), all of which are within the scope of the appended claims. Thus, for example, the person skilled in the art may find equivalent solutions for the mechanical means for the displacement motions of the apparatuses, the support and traction of the glass sheets  2  along the axis x, the vertical motion of the head  300  coupled to the carriage  201  along the axis y, the rotation of the application head  300  along the axis φ et cetera, the mechanical means for the continuous or discontinuous movements of the spacer profile  3 . Also the actuation means may be electrical, electrical-electronic, pneumatic, hydraulic and/or combined, et cetera, the control means, may be electronic or fluidic and/or combined, et cetera. 
         [0107]    A process and constructive variation, partially already described, which may be known from the background art, is the one constituted by the logic combination of the actuation systems respectively for horizontal translation of the glass sheet (unit  100 ), for vertical translation of the head coupled to the carriage  201  (unit  200 ), for rotation of the head (unit  300 ) and for translation of the belts of the belt transmission devices  304   a,    304   b,  so as to allow the application of the spacer profile  3  on glass sheets  2 ′ that have shapes other the rectangular one (see  FIGS. 18B-18E ). These shapes may be a regular or an irregular polygonal shape. The application may be on glass sheets  2 ″ that have a shape other than the rectangular one, such as that constituted by curvilinear parts, or on glass sheets  2 ′″ that have a shape other than the rectangular one being, for example, constituted by both linear and curvilinear parts. 
         [0108]    In order to obtain these, as completion of what has been described previously, the electric actuation systems of the motors or pair of motors  102 ,  202 ,  302 ,  305   a,    305   b  will be concatenated by means of an electric axis (numeric control). 
         [0109]    The constructive details can furthermore be replaced with other technically equivalent ones. The materials and dimensions may be any according to requirements, in particular those arising from the dimensions (base and height) of the glass sheets  2  and therefore of the insulating glazing  1 . The machine can have a direction of work that is opposite to the one described and illustrated in the figures, or L-shaped or U-shaped, with no need for additional explanations. 
         [0110]    The industrial application of, and the need for machines as claimed is immediately clear from the above disclosure. Machines for the automatic application of the flexible spacer profile  3  made of expanded synthetic material on glass sheets  2  currently are not widespread, but are nevertheless substantially present and required. Use of the flexible spacer profile  3  made of expanded synthetic material, because of its technical and technological characteristics (particularly the low coefficient of heat conductivity) and its applicability also in manual or semi-automatic version is also highly required. Moreover, the use of insulating glazing  1  is expanding continuously, since in recent years it has been increased by all those configurations that require the use of special and therefore heavy glass, such as the ones described in the introduction (and in particular the very thick ones, such as toughened glass and in particular combinations of more than two glass sheets), which are thus coupled advantageously from the very first mating by means of the spacer frame, if it is of the type to which the present application relates, unlike the conventional type, which requires the catalysis of the second sealant before the glass-frame joint can be stressed with mechanical loads. An essential concept, introduced only in the present invention, is to render flexible, in the sense of alternable, the use of a plurality of types, thicknesses and colors of the flexible spacer profile  3  made of expanded synthetic material by means of a simple and reliable automation that allows quick transition from one profile to another. This was already taken for granted in the case of the spacer profile  3  made of rigid material (albeit very complex in the case of complete automation) but was not yet possible in the case of a spacer profile  3  made of expanded synthetic material except manually and at the expense of a waste of material and of an excessive use of time and in particular at the expense of productivity, since it was necessary to stop the process of production of the insulating glazing during the considerable time required to replace the reel  401 . Such requirement is in fact current in the production of insulating glazing in which product merges are highly various even for a single user, to the point of reaching variability even within the same unit of insulating glazing  1  when it is constituted by more than two glass sheets  2  and therefore by more than one flexible spacer frame  3  if it is required. Although not systematical but in any case frequent, it is that the unit of insulating glazing has spacer frames with different characteristics, for example in order to improve soundproofing performance or in order to achieve adaptation to the type of door or window frame desired or for the choice of colors, et cetera. 
         [0111]    Insertion of the machine, according to the present invention in the production line of insulating glazing is illustrated in  FIGS. 18A and 19  (perspective and plan views). The machine according to the present invention can be implemented on existing production lines of insulating glazing  1 . The figures identify the technical field to which the invention refers as detailed in the preamble of the description and show how an essential step of the production process of the insulating glazing, which was discontinuous, has been changed, rendering the operation of the entire line completely automatic. The background art had as a shortcoming difficult and costly operation for changing the flexible spacer profile  3  in situations in which there was a change of type (dimensions, color, shape, et cetera) of the flexible spacer profile  3 , or in case of depletion of the reel containing the spacer profile  3 . 
         [0112]    The disclosures in Italian Patent Application No. TV2011A000102 from which this application claims priority are incorporated herein by reference. 
         [0113]    Where technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly, such reference signs do not have any limiting effect on the interpretation of each element identified by way of example by such reference signs.