Abstract:
A glassware manufacturing method and machine, whereby the inner surfaces of the molds of the various forming sections of the machine are treated using a common processing member, and the exhaust substances produced by the treatment are aspirated simultaneously with or at a predetermined time during the treatment by a suction device having at least one suction hood associated with the processing member.

Description:
[0001]    The present invention relates to a glassware manufacturing method. 
       BACKGROUND OF THE INVENTION 
       [0002]    In glassware molding, molding machines, such as the type commonly known as I.S. machines, are employed comprising a number of side by side forming sections, each for producing a respective sequence of articles. 
         [0003]    Each forming section comprises a rough mold, normally with one or a number of adjacent mold cavities, each for receiving a glass gob and forming a respective semifinished article, which is then transferred by an inverter to a mold cavity of a finish mold to be transformed into the finished article. 
         [0004]    Each mold normally comprises a bottom shell; and two lateral half-molds movable with respect to each other and the relative bottom shell between a closed position, in which the lateral half-molds and the bottom shell define the mold cavities, and an open position in which enable the removal of the semifinished or finished articles from the mold. 
         [0005]    To facilitate distribution of the glass inside the mold and removal of the article from the mold to obtain articles of consistent surface quality and shape, the molds are cleaned and lubricated regularly. This substantially consists in removing scale from the inner surfaces of the mold contacting the glass, and coating the surfaces with a release agent or lubricant, e.g. graphite-based, to prevent the glass from sticking to the inside of the mold and so producing flaws in the surface or shape of the semifinished or finished article when it is removed from the mold. 
         [0006]    The surfaces are normally lubricated either by hand, or by spraying the lubricant on using spray heads that can operate with the mold open or closed. 
         [0007]    Whichever the case, given the high temperature of the molds, applying, and particularly spraying, lubricant onto the inner surfaces of the molds inevitably produces emissions which, together with the powdery scale removed, contaminate the surrounding area by settling on machine parts in the vicinity of the molds, thus calling for regular cleaning, and also make for an unhealthy workplace. 
         [0008]    The work carried out on each mold is relatively time-consuming and increases in proportion to the number of machine sections, with the result that downtime and the length of time workers are exposed to such work bear heavily on the production cycle. 
       SUMMARY OF THE INVENTION 
       [0009]    It is an object of the present invention to provide a glassware manufacturing method designed to provide a straightforward, effective, low-cost solution to the above problems, and which in particular provides for reducing downtime and, hence, non-production. 
         [0010]    According to the present invention, there is provided a method of manufacturing glassware on a glassware molding machine comprising a number of forming sections, each for forming a respective article, the method comprising the steps of employing, for each said section, at least one mold having two half-molds movable with respect to each other between a closed position, in which the inner surface of the mold defines a seat for a mass of glass, and an open position, in which the mold permits removal of the mass of glass; treating the inner surface of the mold using a processing member; and aspirating the substances exhausted by said step of treating said inner surface; said treating and aspirating steps being performed by moving at least one processing member and suction means, common to all the forming sections, between the molds of said forming sections. 
         [0011]    The present invention also relates to a glassware molding machine. 
         [0012]    According to the present invention, there is provided a glassware manufacturing machine comprising a number of adjacent forming sections, each for forming a relative article; each forming section comprising at least one mold having two half-molds, and actuating means for moving the half-molds with respect to each other between a closed position, in which an inner surface of the mold defines a seat for a mass of glass, and an open position, in which the mold permits removal of the mass of glass; the machine also comprising at least one processing member common to all the sections and for treating the inner surfaces of said molds; suction means associated with the common said processing member to aspirate the substances exhausted by treating said inner surfaces; and drive means for moving the common said processing member and said suction means between the molds of said forming sections. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0013]    A number of non-limiting embodiments of the invention will now be described by way of example with reference to the accompanying drawings, in which: 
           [0014]      FIG. 1  shows a schematic view in perspective of a first preferred embodiment of the molding machine according to the present invention; 
           [0015]      FIG. 2  shows a schematic of a variation of a detail in  FIG. 1 ; 
           [0016]      FIG. 3  shows a schematic side view, with parts removed for clarity, of a further variation of part of the  FIG. 1  machine; 
           [0017]      FIG. 4  shows a schematic plan view, with parts removed for clarity, of a second preferred embodiment of the molding machine according to the present invention; 
           [0018]      FIG. 5  shows a variation of a detail in  FIG. 4 . 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0019]    Number  1  in  FIG. 1  indicates as a whole a glassware manufacturing machine comprising a supporting structure  2 ; and a number of adjacent known forming sections  3 , not described in detail, each for forming a relative article. 
         [0020]    Each forming section  3  comprises a rough mold  4 ; a finish mold  5 , in this case with two cavities; a known assembly, not shown, for transferring articles from rough mold  4  to finish mold  5 ; and a known assembly, not shown, for transferring the finished article from finish mold  5  to a known unloading conveyor not shown. 
         [0021]    Each mold  4 ,  5  comprises two half-molds  4   a ,  4   b ,  5   a ,  5   b  connected in known manner to a relative actuating assembly  9  ( FIGS. 3 ,  4 ) for moving the half-molds with respect to each other between a closed position ( FIGS. 1 ,  4 ), in which an inner surface  4   c ,  5   c  of the mold defines a seat for a mass of glass, and an open position, in which the mold permits removal of the mass of glass. 
         [0022]    As shown in  FIG. 1 , machine  1  also comprises a mold treating assembly  10  common to all of sections  3  and for treating molds  4 ,  5  of sections  3 . 
         [0023]    Assembly  10  is controlled by a respective control unit  12  synchronized with each section  3 , and comprises a fixed supporting structure  11  connected to structure  2  of machine  1  and comprising a cross member  13 . Cross member  13  extends across machine  1 , crosswise to sections  3 , perpendicular to the travelling direction of the masses of glass in sections  3 , and, in the example shown, over molds  4 ,  5 . In an alternative variation not shown, cross member  13  extends below a top end of mold  4 ,  5 . In both solutions, cross member  13  is fitted integrally with a straight runner  15 , along which runs both ways a powered carriage  16  forming part of assembly  10  and fitted in known manner with one end of a controlled-axis articulated arm  18  also forming part of assembly  10 . 
         [0024]    Arm  18  is fitted on its free end with a head  19  for attaching a mold processing member  20 , which may conveniently be a spray member, or a powered scraper or cleaning brush for brushing deposits off the inner surfaces of molds  4 ,  5 , regardless of the relative position of the half-molds. The spray member forms the end member of a spray device  23  for spraying lubricant onto inner surface  4   c ,  5   c  of mold  4 ,  5 , and which also comprises a pipe (not shown) for feeding lubricant to the head and connected at one end to spray member  20 , and at the other end to a dispenser on or off machine  1 . 
         [0025]    As shown in  FIG. 1 , assembly  10  also comprises a suction device  24  associated with device  23  to withdraw from molds  4 ,  5  the exhaust produced by processing member  20 . More specifically, suction device  24  comprises a suction unit  25  (shown schematically); a suction hood  26 ; and an exhaust conduit  27  connected to suction hood  26  at one end, and to suction unit  25  at the other. 
         [0026]    With reference to  FIG. 1 , suction hood  26  is designed according to the type of molds  4 ,  5  fitted to sections  3 . More specifically, in the case of single-cavity molds, hood  26  surrounds processing member  20 , and extends axially, i.e. in the same direction as processing member  20 , sufficiently to house the whole of processing member  20  ( FIG. 3 ), or so that the processing member projects from an axial edge  26   a  of hood  26 , as shown in  FIGS. 1 and 2 , by a length depending on the type of mold and how the mold is to be processed. 
         [0027]    In the case of multiple-cavity molds, i.e. comprising two or more side by side cavities  28  as shown in  FIG. 3 , a hood  26  of the above type is provided for each cavity  28 , and cavities  26  are all connected to the same exhaust conduit  27 . 
         [0028]    Alternatively, as shown in  FIG. 1 , head  19  is fitted with a single hood  26  common to all of cavities  28 , and at least partly housing a number of processing members  20  equal to the number of cavities  28 . 
         [0029]    In actual use, when one of molds  4 ,  5  of one of sections  3  needs cleaning or lubricating, unit  12 , given the location of the mold  4 ,  5  for processing, moves carriage  16  along runner  15  from a rest position, and arranges articulated arm  18  to position head  19  over the mold  4 ,  5  for processing, and set processing member  20 , and therefore suction hood  26 , to the correct operating position. At this point, simultaneously with or at a given time after commencing processing of the inner surface of mold  4 ,  5 , suction unit  25  is activated, and the exhaust materials produced by processing the mold are aspirated from the mold area to prevent them settling on and fouling the machine, or being inhaled or touched by machine operators. Once processing is completed, head  19  is withdrawn from the processed mold  4 ,  5 , and assembly  10  is again ready to process another mold  4 ,  5  or the same or a different section  3 . 
         [0030]    The  FIG. 4  variation shows a machine  35  which differs in a few construction details from machine  1 , and the parts of which are indicated, where possible, using the same reference numbers as for the corresponding parts of machine  1 . 
         [0031]    Articulated arm  18  of machine  35  supports a head  36  fitted with a single hood  37 , which is positioned in use facing a vertical mating plane  38  of half-molds  5   a ,  5   b  to communicate with the inside of the cavity when half-molds  5   a ,  5   b  are in the open position. Accordingly, hood  37  has a conveniently rectangular exhaust inlet  39  with a long side substantially equal to or only slightly larger than the height of half-molds  5   a ,  5   b , and with a short side only slightly larger than the distance between the mating edges of half-molds  5   a ,  5   b  in the open position, as shown by the faint line in  FIG. 4 . 
         [0032]    Machine  35  also comprises a second articulated arm  40 , which is also controlled by control unit  12 , is connected at one end to carriage  16 , and is fitted at the opposite end with a head  41  fitted with one or the other of said processing members  20 . 
         [0033]    In the  FIG. 5  variation, head  41  is fitted with two different members  20  extending in two different directions, and which can be activated selectively, depending on how mold  4 ,  5  is to be processed. This solution obviously greatly reduces processing time, by enabling different processing of different parts of the same mold without having to retool assembly  10 . 
         [0034]    Clearly, changes may be made to machines  1  and  35  as described herein without, however, departing from the protective scope defined in the accompanying Claims. In particular, runner  15  may be located otherwise than as described by way of example, and processing members  20  and suction hoods  26  may differ from those described.