Abstract:
A method and device for handling cheese blocks. Compressed cheese curd is released from the inner wall of a mould and after a turning operation is evacuated from the mould, with the mould rotated, lowered and shaken or blown. A lifting gripper is guided as far as the stop on a pick-up device, and in the mould the cheese block is subjected to a shaking movement. The mould, that is to say, the cassette, is then raised, rotated and guided back into the cassette press, so that the cheese block can be fixed in position on the lifting gripper by a clamping means. The pick-up plunger with the cheese block is then lowered, that is to say, retracted, the lifting gripper is traversed towards a secondary mould for the cheese block, preferably downwards, the clamping means open, and the cheese block is positioned in a secondary mould.

Description:
FIELD OF THE INVENTION 
       [0001]    The invention relates to a method for purposes of handling cheese blocks, and a device for this purpose, which in particular can be assigned to a so-called cassette press with round or cornered cheese moulds. 
       BACKGROUND 
       [0002]    A device for the industrial production of cheese blocks is of known art from e.g. EP-A-350777. This comprises a cheese press with a rectangular pan, open above, for the accommodation of moulds, a column frame for purposes of arranging a press head that can be raised and lowered, and a distribution head for purposes of supplying and metering the cheese curd into the moulds and a portal carriage that can traverse on the pan for purposes of guiding the distribution head and for purposes of manipulating a turning mechanism for the moulds. Here the distribution head and the turning mechanism must be manually prepared, that is to say, changed over. EP-A-406899 shows a further development of such a device in which the moulds are accommodated in cassettes, which in turn are arranged compactly in the form of rows in the pan. Above the moulds is provided a press head with compression rams aligned with the moulds for purposes of compressing the cheese curd. The cassettes have an edge design minimising clearance and a mechanised device is provided for purposes of moving the cassettes. 
         [0003]    Moreover, a tray can be assigned to the pan for second moulds, into which the immature compressed cheese blocks are reloaded (EP-A-1769676). The moulds can be supplied by means of a roller conveyor of an appropriate handling device of the press to a further work section. 
         [0004]    In accordance with EP-B-543185 a mould cover can be connected via a tilting device with the compression ram (in a self-centring manner) so that by virtue of possible tilting movements any suction of the mould cover onto the cheese mass is avoided. The mould itself is round or rectangular and can consist of an outer container and an inner perforated casing. 
         [0005]    The compressed cheese blocks can, for example, be removed from the mould by means of a gripper, wherein air is blown into the press mould beforehand in order to release the cheese block from the mould wall (EP-B-1269832 or DE-B-922448). 
         [0006]    Contact of the cheese block with the air or other gases that are blown in can present a hygiene problem. In order to avoid this attempts have also been made to remove the cheese block from the press mould by means of vacuum grippers. However, this leads to the formation of stubs, or in general to damage of the surface, or even to tearing of the cheese. 
         [0007]    A further cassette press of this type is published in CH704208A2 and EP2710888A1. The cassette press in accordance with CH704208A2 has two handling devices, wherein the second handling device, which can travel along the longitudinal sides of the pan, interacts with a turning unit. 
         [0008]    EP2710888A1 discloses a cassette press that is provided with a shaker, which is assigned to a horizontally arranged tray or conveyor for the compressed cheese block. 
       SUMMARY 
       [0009]    Disclosed is a method for the automatic handling of cheese blocks, with which in particular a protective, rapid and precise removal of the cheese block from a primary mould and placement in a secondary mould can be achieved. 
         [0010]    In accordance with at least some embodiments of the invention there takes place:
       a) an operation of shaking or blowing onto a cheese curd compressed in a mould, wherein the mould, that is to say, a cassette with the moulds therein arranged, is rotated and lowered beforehand, and a pick-up plunger retracts into the mould as far as the cheese block, and after the shaking or blowing operation once again extends out of the mould, and the latter can then be rotated back into its initial position,   b) a lifting gripper is lowered as far as the stop on a pick-up device ( 13 ),   c) the cheese block in the mould is subjected to a shaking movement or a blowing operation,   d) the mould, that is to say, the cassette, is then raised, rotated and guided back into its initial position in the cassette press, and the lifting gripper is raised,   e) the cheese block is fixed in position on the lifting gripper by means of a clamping means,   f) the lifting gripper is traversed, preferably downwards, towards a secondary mould for the cheese block, and   g) the clamping means open, and the cheese block is positioned in the secondary mould.       
 
         [0018]    The release of the cheese block, that is to say, the cheese curd, from the inner wall of the mould takes place by means of a shaking or a blowing operation on the compressed cheese block, immediately, that is to say, directly before removal from the mould. The shaking movement is introduced immediately after the operation of turning the mould, such that each cheese block can then lie on a pick-up plunger. 
         [0019]    The shaking operation takes place only briefly and at least once. 
         [0020]    The shaking movement can take place horizontally or vertically. The mould is thereby preferably lowered into a shaker. 
         [0021]    Each cheese block can be pushed into the secondary mould with the pick-up plunger. 
         [0022]    The cheese blocks are not only protectively but also hygienically removed from the mould and transported onwards. 
         [0023]    Also disclosed is a device for the handling of cheese blocks, which enables a rapid reloading of cheese blocks. 
         [0024]    Preferred forms of embodiment are disclosed as well. 
         [0025]    The inventive device is of compact construction and enables automated handling and in particular gripping of the cheese block, and thus a rapid repopulation of the cassette press, since the cheese must only spend a short time in the moulds. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0026]    In what follows an example of embodiment of the invention is described in more detail with the aid of figures. In the figures: 
           [0027]      FIG. 1  shows a cassette press in a partial view; 
           [0028]      FIG. 2  shows an inventive lifting gripper with a pick-up device; 
           [0029]      FIG. 3  shows an inventive lifting gripper with a pick-up device and a pick-up plunger; 
           [0030]      FIG. 4  shows a clamping bar of the inventive device with clamping jaws; 
           [0031]      FIG. 5  shows an inventive lifting gripper with a pick-up device and an ejector. 
       
    
    
     DETAILED DESCRIPTION 
       [0032]    A cassette press  1  for purposes of compressing a cheese curd so as to reduce the fluid content, taking into account the disclosures of CH-A-704208 A and/or CH 706999 A, comprises:
       a pan  2  that is rectangular in plan view and open upwards ( FIG. 1 ), with cassettes  3  that are rectangular in plan view and open upwards; the latter are arranged side-by-side in rows transverse to the longitudinal direction of the pan  2 ,   moulds  4  for purposes of accommodating the cheese curd to be compressed, which are arranged in the cassettes  3 , wherein a mould  4  can be a part of the cassette  3  and has at least one floor and one casing, with at least one outlet for the fluid that is to be pressed out,   on the upper edges, which form the outer sides of the cassette block in the pan  2  in the longitudinal and transverse directions, edge plates with a height of several centimetres can be arranged, to enable the cheese curd to be floated in (e.g. by means of a pipe distributor, or other means), up to above the upper edge of the cassette,   a press head, mounted on end columns, with a multiplicity of compression rams, aligned with the moulds  4 , and not explicitly represented, for purposes of compressing the cheese curd, designed e.g. in accordance with the disclosure of EP-B-543899, together with a hold-down device for purposes of releasing the press head from the cassettes  3 ,   a pipe distribution system, that is to say, a filling apparatus, for purposes of floating in the cheese curd,   at least one handling unit  5 , which, driven by a motor, can travel along the longitudinal sides of the pan  2  for purposes of raising, traversing and handling a cassette  3  outside the pan  2  in particular also from and to a device  18  for purposes of removal from a mould, or placement in a mould, on the end face of the pan edge ( FIG. 1 ).       
 
         [0039]    A device  18  for purposes of handling the cheese block K is assigned to the cassette press  1 ; this has a device for purposes of rotating/turning the cassette  3  about its longitudinal axis (turning unit  8 ) and it is moreover provided with a shaker  7  arranged near to the turning unit  8 . It also comprises a conveyor track  6  for secondary moulds  14 . 
         [0040]    The device  18  moreover comprises a lifting gripper  12  assigned to the conveyor track  6 , mounted such that it can be traversed vertically, which is provided with at least one pick-up device  13  and devices for purposes of clamping the cheese blocks K. 
         [0041]    The device  18  for purposes of handling the cheese block K with a lifting gripper  12  in accordance with  FIG. 2  comprises a frame  9  for purposes of accommodating the shaker  7  and the turning unit  8 . The handling unit  5  of the cassette press enables the raising and lowering of the cassette  3 . The lifting gripper  12  can be moved vertically between the cassette  3  and the conveyor track  6 . The clamping devices of the lifting gripper  12  are clamping jaws. 
         [0042]    The pick-up device  13  is located between the conveyor track and the lifting gripper  12 , and can be traversed horizontally. 
         [0043]    The lifting gripper  12 , the pick-up device  13 , and the clamping jaws  11  can, for example, be actuated pneumatically or electrically. 
         [0044]    For purposes of handling of cheese blocks K removed from the cassette press  1  the pick-up device  13  firstly retracts under the lifting gripper  12 , which is raised beforehand, into the workspace  10  of the device  18 , and the already supplied cassette  3  with the moulds  4  is turned through 180°, lowered into the shaker  7 , and positioned over the pick-up device  13 . 
         [0045]    Synchronously with the lowering movement of the cassette  3 , that is to say, of the moulds  4 , the lifting gripper  12  is lowered until it comes into contact with the pick-up device  13 , and the shaking or blowing operation is executed. The cheese blocks K are released from the mould wall and lie on the pick-up device  13 . 
         [0046]    In a form of embodiment in accordance with  FIG. 5 , the cassette  3  with the moulds  4 , is then raised, again rotated through 180° into the initial position, and is traversed to the cassette press  1 . 
         [0047]    If, in a further possible configuration of the inventive device  18 , push-in plungers are present, the lifting gripper  12  is raised up to a point at which the pick-up device  13  can extend under the latter, and the clamping jaws of the clamping frame  17  can clamp the cheese blocks K. 
         [0048]    The lifting gripper  12  is then traversed towards the conveyor track  6  up to a point at which the pick-up device  13  can once again retract into the workspace  10 , and the cheese blocks K can be pushed with the push-in plungers into the secondary moulds  14 , for which purpose the clamping jaws  11  are also opened once again beforehand. The lifting gripper  12  is then raised up to its initial position and the pick-up device  13  can extend out of the workspace  10 . 
         [0049]    The secondary moulds  14  are traversed on the conveyor track  6  to another workstation and empty secondary moulds  14  are supplied. 
         [0050]    The device  18  for purposes of handling the cheese block K with a lifting gripper  12  in a form of embodiment in accordance with  FIG. 3  comprises a frame  9  for purposes of accommodating the shaker  7  and the turning unit  8 . The handling unit  5  enables a raising and lowering of the cassette  3 . The lifting gripper  12  can be moved vertically between the cassette  3  and the conveyor track  6 . The clamping devices of the lifting gripper  12  are clamping jaws. 
         [0051]    The pick-up device  13  is fitted with pick-up plungers  16 , and is located between the conveyor track  6  and the lifting gripper  12 , and can be traversed horizontally. 
         [0052]    The lifting gripper  12 , the pick-up device  13 , the pick-up plungers  16 , and the clamping jaws  11  can, for example, be actuated pneumatically or electrically. 
         [0053]    For purposes of handling cheese blocks K removed from the cassette press  1 , the already supplied cassette  3  with the moulds  4  is turned through 180° and lowered into the shaker  7 . 
         [0054]    The pick-up device  13  then retracts into the workspace  10  of the device  18 , the pick-up plungers  16  are extended into the moulds  4  of the cassette  3 , and the shaking or blowing operation is executed. The cheese blocks K are released from the mould wall and lie on the pick-up plungers  16 . The cassette  3  is then raised, again rotated through 180° into the initial position, and is traversed to the cassette press  1 . 
         [0055]    The pick-up plungers  16  are traversed vertically (lowered) with the cheese blocks K lying on them, in the direction of the secondary moulds  14 , and the clamping jaws  11  can now clamp the cheese blocks K. 
         [0056]    The pick-up device  13  is then extended out of the workspace  10 , and the lifting gripper  12  is traversed downwards towards the conveyor track  6  to a point at which the cheese blocks K can slide into the secondary moulds  14 , for which purpose the clamping jaws  11  are also opened once again beforehand. 
         [0057]    The lifting gripper  12  is then raised up to its initial position. 
         [0058]    The secondary moulds  14  are traversed on the conveyor track  6  to another workstation and empty secondary moulds  14  are then supplied. 
         [0059]    The device  18  for purposes of handling the cheese block K with a lifting gripper  12  in accordance with  FIG. 5  comprises a frame  9  for purposes of accommodating the shaker  7  and the turning unit  8 . The handling unit  5  enables a raising and lowering of the cassette  3 . 
         [0060]    The device  18  also has an ejector  15  for each mould  4 . The lifting gripper  12  can be moved vertically between the cassette  3  and the conveyor track  6 . The clamping devices of the lifting gripper  12  are clamping jaws  11 . 
         [0061]    The pick-up device  13  is located between the conveyor track and the lifting gripper  12 , and can be traversed horizontally. 
         [0062]    The pick-up device  13  is fitted with the ejectors  15 , one for each of the moulds  4 , that is to say, each of the cheese blocks K. 
         [0063]    The lifting gripper  12  is driven by an electric motor, while the pick-up device  13 , the ejectors  15 , and the clamping jaws  11  can, for example, be actuated pneumatically or electrically. 
         [0064]    For purposes of handling cheese blocks K removed from the cassette press  1  the pick-up device  13  firstly retracts under the lifting gripper  12  into the workspace  10  of the device  18 , and the lifting gripper  12  is then lowered until it comes into contact with the pick-up device  13 . 
         [0065]    The already supplied cassette  3  with the moulds  4  is turned through 180°, lowered into the shaker  7 , and positioned above the pick-up device  13 , and the shaking or blowing operation is executed. 
         [0066]    The cheese blocks K are released from the mould wall and lie on the pick-up device  13 . 
         [0067]    The cassette  3  is then raised, again rotated through 180° into the initial position, and is traversed to the cassette press  1 . 
         [0068]    The lifting gripper  12  is raised up to a point at which the pick-up device  13  can extend under it. The clamping jaws  11  can now clamp the cheese blocks (K). 
         [0069]    The lifting gripper  12  is then traversed downwards towards the conveyor track  6  up to a point at which the pick-up device  13  can once again retract into the workspace  10 , and the cheese blocks K can be pushed with their ejectors  15  into the secondary moulds  14 , for which purpose the clamping jaws  11  can also (optionally) be opened once again beforehand. 
         [0070]    The ejectors  15  then retract once again into the pick-up device  13 , and the pick-up device  13  extends out of the workspace  10 , and the lifting gripper  12  is raised up to its initial position. 
         [0071]    The secondary moulds  14  are traversed on the conveyor track  6  to another workstation, and empty secondary moulds  14  are supplied. 
         [0072]    The clamping jaws  11  can be arranged in a clamping beam  10  and are actuated collectively via the clamping beam  10  ( FIG. 4 ). 
         [0073]    The shaking movement is preferably executed horizontally, and takes place at least once. 
         [0074]    Both on the pick-up device  13  and also in the secondary moulds  14 , the cheese blocks K are located in a defined manner, and no manual access is necessary. 
         [0075]    The lifting grippers  12  can in principle be employed for all cheese shapes. 
       REFERENCE LIST 
       [0076]      1  Cassette press 
         [0077]      2  Pan 
         [0078]      3  Cassette 
         [0079]      4  Mould 
         [0080]      5  Handling equipment 
         [0081]      6  Conveyor track 
         [0082]      7  Shaker 
         [0083]      8  Turning unit 
         [0084]      9  Frame 
         [0085]      10  Workspace 
         [0086]      11  Clamping jaw 
         [0087]      12  Lifting gripper 
         [0088]      13  Pick-up device 
         [0089]      14  Secondary mould 
         [0090]      15  Ejector 
         [0091]      16  Pick-up plunger 
         [0092]      17  Clamping frame 
         [0093]      18  Device 
         [0094]    K Cheese block