Abstract:
The invention relates to a box carrier having a contact surface for transporting flat cutouts, or sleeves, and folding boxes produced from the same. According to the invention at least one suction opening, which can be connected to a vacuum source, is disposed in the contact surface.

Description:
FIELD OF THE INVENTION 
       [0001]    The invention relates to a box carrier having a contact surface for transporting flat blanks and sleeves and folding boxes from them. 
       BACKGROUND OF THE INVENTION 
       [0002]    Conventional transportation systems for boxes are usually based on box carriers with mechanical clamping of the boxes. The carriers can each transport one box format or package style, and converting to new formats involves a considerable expenditure of time. Often, format-specific parts of the mechanical box mounts have to be replaced. These interventions mean a drop in production from stoppage of the machine and have the potential for mistakes in the setup or setting, which is problematic above all in the pharmaceutical industry. The setup time is especially long in variants that have replaceable box carriers, while mere settings, although they require less time, nevertheless have a high potential for error. A further disadvantage of holding boxes mechanically by means of clamping is the unavoidable deformation of the boxes that occurs, which makes closing of the boxes while they&#39;re being held by the box carrier more difficult. 
         [0003]    As a universally usable alternative to the box carriers with mechanical clamping, vacuum belts are known, which are capable of processing various box formats without conversion. However, vacuum belts are distinguished by poor precision and cannot reliably prevent unintentional shifting of the boxes while they are being transported. Vacuum belts are therefore unsuitable for use particularly in the pharmaceutical field. 
       SUMMARY OF THE INVENTION 
       [0004]    The object of the invention is to create a box carrier of the type defined at the outset that does not have the aforementioned disadvantages. 
         [0005]    A further object of the invention is to furnish a box carrier for transporting boxes for packaging pharmaceutical products, in particular, in a packaging machine. 
         [0006]    It leads to the inventive attainment of this object that at least one suction opening that can be connected to a vacuum source is disposed in the contact surface. 
         [0007]    The disposition according to the invention of suction openings in the contact surface offers the following advantages, in comparison to the embodiments offered in the prior art:
       No format conversions for different box formats are necessary.   The carrier is equally suitable for sleeves and flat blanks.   Secure hold because of high retention forces and secure positioning of the boxes, since no shifting is possible in the carrier.   No deformation of the boxes from retention forces.   Good accessibility; the boxes are held essentially only by one side, while the other sides are essentially freely accessible.   The boxes can be closed while they are located in the box carrier, since they do not undergo deformation.   The good accessibility makes the imprinting/coding the boxes and comparable operations easier.   High security, since not vulnerable to mishandling.       
 
         [0016]    Aspirating the boxes by means of a vacuum has decisive advantages in terms of ergonomics and format adaptation. The good ergonomics and the ease of use are the primary advantages in the use of the invention. The downtime of the machine for the format conversion is shortened, and possible sources of mistakes are reduced to a minimum. The fact that no special knowledge on the part of the user is necessary for the format conversion is also important. 
         [0017]    A highly flexible, universally usable transportation system is available, which makes it possible to package various products on one and the same machine, without much effort being expended upon a change of format. In particular, all the format ranges are covered, and no format parts are necessary, and the box carriers have an only slight weight. Furthermore, practically automatic format conversion ensues; the boxes can be erected in the cup, and practically no compression or deformation of the boxes occurs. 
         [0018]    Because compression and deformation is precluded, the boxes can already be closed in the box carrier; additional processing steps, such as labeling and coding the boxes, are also equally possible because of the high accessibility on all sides. 
         [0019]    The box carriers can have a position stop. A stop on side defines the position of the boxes. 
         [0020]    The contact surface of the box carrier preferably has a plurality of suction openings. Suction openings equipped with a valve, in particular a touch valve, are expedient in this respect. By the use of touch valves, which open only when a box is in contact with them, even blanks that do not cover all the suction openings can be held without air being aspirated through the suction openings that are not covered. It is thus assured that the underpressure in the box carrier is not diminished by air flowing in. The size and spacing of the suction openings are selected such that for the box formats to be processed, no suction openings that are only partly covered can occur. 
         [0021]    Preferably, each box carrier is equipped with its own vacuum reservoir that communicates with the suction openings. 
         [0022]    Sleeves, that is, boxes with side walls that are tall in proportion to the bottom area, are retained on one side wall; thus the stop face that has the suction openings is perpendicular to the circulation plane of the transporting means. 
         [0023]    Flat blanks with a low side wall height in proportion to the bottom area are carried, given a horizontal box carrier, by the horizontally oriented contact surface and are accordingly held from beneath. In a practical way, the box carrier is designed such that a conversion from sleeves to flat blanks can be made by simply rotating the box carrier by 90°. 
         [0024]    Box carriers with their own vacuum reservoir, for venting and ventilating the vacuum reservoir in a venting and ventilating station, are preferably equipped with a touch check valve. As a result, it is possible to dispense with delivering the requisite vacuum or underpressure to the circulating box carriers, something that involves major effort. The box carriers provided with vacuum reservoirs are subjected to a vacuum only at points along the circuit intended for that. After that, the box carrier is uncoupled and maintains the negative pressure on its own with the aid of its vacuum reservoir. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0025]    Further advantages, characteristics and details of the invention will become apparent from the ensuing description of preferred exemplary embodiments and from the drawings; the drawings schematically show the following: 
           [0026]      FIG. 1 , an oblique view on a portion of a circulating machine with circulating box carriers; 
           [0027]      FIG. 2 , an oblique view on the front side of a box carrier of  FIG. 1  for sleeves, with two suction openings that have integrated touch valves; 
           [0028]      FIG. 3 , an oblique view on the back side of the box carrier of  FIG. 2 ; 
           [0029]      FIG. 4 , an exploded view of the box carrier of  FIG. 2 ; 
           [0030]      FIG. 5 , an enlarged oblique view on the touch check valve of  FIG. 4 ; 
           [0031]      FIG. 6 , an oblique view on a box carrier for flat blanks, with four suction openings that have integrated touch valves; 
           [0032]      FIG. 7 , an oblique view on a prekinking station and a closing station for sleeves; 
           [0033]      FIG. 8 , a side view in section of the arrangement of  FIG. 8 , looking in the direction s; 
           [0034]      FIG. 9 , an oblique view on the closing station of  FIG. 7 , which is open at the top. 
       
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
       [0035]    A circulating system  10 , shown only in part in  FIG. 1 , of a packaging machine not shown in further detail in the drawings has a plurality of box carriers  14 , disposed on a conveyor chain  12  revolving endlessly in a horizontal plane, and the box carriers have a contact surface  16 , forming a front side and having two suction openings  18 , and a position stop  20  for a folding box. A vacuum reservoir  22  with an integrated touch check valve  24  is disposed on the back side of the box carriers  14 . 
         [0036]    The circulating system  10  has five venting stations  26  with lifting suction devices for simultaneous evacuation of the vacuum reservoir  22  of five box carriers  14 . For venting the vacuum reservoir  22 , the lifting suction devices of the venting station  26  dock at the venting positions via a suction line  28  on the back side of the box carrier  14  above the outlet of the touch check valve  24 , and a suction cup  30  disposed on the free end of the suction line  28  attaches firmly by suction to the back wall of the vacuum reservoir  22 . Simultaneously, because of the air flow, the touch check valve  24  opens, and the air is removed by suction. If the lifting suction device is intended to release again from the box carrier  14 , then a brief blow-off impetus is given, which also presses a ball in the touch check valve  24  onto its seat again because of the change in the flow direction. There is now a vacuum in the box carrier  14 . 
         [0037]    At the outlet of the machine, five pneumatic cylinders  32 , corresponding to the number of venting stations  26 , are disposed in such a way that for the sake of simultaneous ventilating of five box carriers  14 , they are located opposite the vacuum chambers  22 . Upon actuation of the pneumatic cylinders  32 , a cylinder rod  34  presses on the touch check valve  24  in the axial direction y from the back wall side of the vacuum chamber  22  and presses the touch check valve inward by approximately 3 mm in the axial direction y. In this operation, an O-ring used as a sealing ring detaches from the inner wall of the vacuum reservoir  22 , so that air flows into the vacuum chamber  22  from outside. As a result of this ventilation of the vacuum reservoir  22 , the boxes, contacting the contact surfaces  16  and held on the box carriers  14  by an underpressure, are detached from the box carriers  14 . 
         [0038]    A box carrier  14  for sleeves, shown in  FIGS. 2 and 3 , has two suction openings  18 . In each suction opening  18 , there is one touch valve  36 , with a feeler pin  38  protruding away from the vertical plane of the contact surface  16 . When a sleeve or folding box is placed against the contact surface  16  and against the position stop  20  that protrudes at a right angle from the contact surface  16 , only those feeler pins  38  that are covered by the folding boxes contacting them are pressed inward, thus opening the touch valves  36 . When there is a large number of different formats, it can prove practical as a rule to provide a greater number of suction openings  18  over the contact surface  16 . 
         [0039]    The exploded view of  FIG. 4  shows the construction of the box carrier  14  shown in  FIGS. 2 and 3 , with two suction openings  18 , each with one touch valve  36  with a feeler pin  38 , in a box carrier screen  40  screwed to a box carrier base plate  42 . The position stop  20  embodied as a plate is screwed laterally to the box carrier base plate  42 . A boxlike back wall part  44  is screwed to the base plate  42  via a flat seal  46  and forms the vacuum reservoir  22 . Inside the vacuum reservoir  22 , the touch check valve  24  is supported on one of its ends displaceably in the axial direction y in a valve holder  48 , and with an O-ring seal  50  on its other end, it presses against the inner wall of the back wall part  44 , which is provided with an opening  52 . For securing the box carrier  14  to the circulating conveyor chain  12 , a mounting  54  that can be screwed to the conveyor chain  12  protrudes downward from the base plate  42 . 
         [0040]    The touch check valve  24 , as shown in  FIG. 5 , is retained in a valve receptacle  56  that carries the O-ring seal  50 , and for sliding support in the axial direction y it is inserted into the valve holder  48 . A compression spring  60  is disposed between the valve receptacle  56  and a spring steel disk  58  that is provided for contact with the valve holder  48 . 
         [0041]      FIG. 6  shows a box carrier with a horizontally located contact surface  16  that has four suction openings  18 . 
         [0042]    The devices shown in  FIGS. 7 through 9  serve to close the bottom of the folding boxes or sleeves  62 , which are transferred from a top loader before they are filled. The box carriers  14 , mounted on the conveyor chain  12  and having the folding boxes  62 , are moved, for closure of the box bottom, successively past a prekinking station  64  and a closing station  70 . 
         [0043]    In the prekinking station  64 , the bottom is located at a ledge  66 , and a kink lever  68  kinks the insertion tab. Next, the chain conveyor moves the box carrier  14  into the closing station  70 . There, a dust tab kinker  72  first moves outward and kinks tabs inward. Then a pivoting rake  74  closes the bottom from behind. At the same time, the dust tab kinker  72  moves inward again, and the bottom is closed completely by means of a guide plate with the pivoting rake  74 . After that, the pivoting rake  74  moves back again. 
         [0044]    With the exemplary embodiments described above, the following demands are met:
       The system is suitable for boxes made from sleeves and/or flat blanks.   Replicable, fast format change (±0.5 mm) with as little possibility of adjustment by the human operator as possible.   High flexibility in terms of layout (inflow and outflow of material).   High box output (up to 300 pieces/minute).