A DEVICE FOR PRESSING AND MOLDING CURD

Abstract: The device for pressing and molding curd comprises a mold reverser (1) in the form of an endless conveyor (16) transporting cheese molds (2) along a horizontal upper portion on which the molds are standing upright with their apertures at the top and a horizontal lower part on which the molds are upside down. The conveyor supports transverse mold bottoms (17) to which rows of molds are fixedly attached. Mold lids (20) which are open when the molds are on the upper part are adapted to be automatically closed when the molds are moved down to the lower part, to normally be maintained closed while the molds are on the lower part, to be opened for emptying the finished cheeses into a water basin (4), and to be opened when the molds are moved up onto the upper part. The arrangement makes possible the automatic filling of the molds by means of a filling device (3) located above the conveyor and forced pressing of the curd by means of a pressing device (5) above the conveyor and downstream the filling device.

Description: A Device for Pressing and Molding Curd In pressing curd to mold cheeses the curd and whey conventionally are poured into molds having perforated walls and loosely placed on perforated plates whereupon the curd for a period of time is allowed to shrink under its own weight. During such period of time the molds are reversed a number of times in order for the resulting cheese to become as homogeneous as possible. Sometimes this self-pressing is carried out in combination with forced pressing by means of piston-like devices. The forced pressing will shorten the pressing time. The molds and the bottoms thereof, and the plate on which they are placed, are perforated to allow the whey to escape. This prior art has several disadvantages. Even when the reversal of the molds is carried out by mechani¬ cal means this operation is time-consuming and costly. At least in the case of certain types of cheese the molds must be emptied by force. It is especially difficult to make tall cheeses in this matter. The invention therefor has for its purpose the provision of a cheese press which eliminates the above disadvantages of the prior art. Especially, the cheese press of the invention is to allow also tall cheeses to be manufactured without special difficulty, and it is to permit pressing the cheeses as desired without the cheeses sticking. These purposes are obtained by the device of the claims. The invention will be explained in more detail below with reference to the attached schematic drawing showing a preferred embodiment of the device of the in¬ vention and wherein Fig. 1 is a side elevational view of the complete device, Fig. 2 a top planar view of the filling device. Fig. 3 a top planar view of the pressing -device, and Fig. 4 a partial end elevational view of the mold reverser. The main portion of the preferred embodiment of the invention is constituted by a mold reverser 1 supporting a number of cheese molds 2 and associated with a device 3 for filling molds 2 with curd 0 and whey, a water basin 4 into which for reasons known to the expert cheeses 0 are delivered upon the pressing having been completed, and preferably a device 5 for forced pressing of curd. The elevational sub-views of the drawing show filling device 3 and pressing device 5 in top planar views and a row of formers 2 standing on the mold reverser in a partial elevational view. Curd and whey are pumped ' to filling device 3 from a supply tank, not shown, to a device 6 which acts to evenly distribute the curd and the whey over the lenghts of a number of preferably perforated rollers 7. These are mutually parallel and horizontal and have a length corresponding to the length of the rows of cheese molds 2 to be placed on mold reverser 1 transversely to the longitudinal direction thereof. Furthermore, rollers 7 are positioned adjacent eachother with small mutual separations and above eachother in a staircase arrange¬ ment wherein they overlap mutually as seen both verti¬ cally from above and horizontally laterally from viewing directions normal to the longitudinal axes of the rollers. The material emanating from distribution device 6, of a funnel-like configuration in planar view, will fall on the top face of top roller 7. Rollers 7 are rotated by means of a drive, not shown, such that the top peripheral surfaces of rollers 7 move from distri¬ bution device 6 so that, as will be immediately under- stood, the curd and whey delivered from this device will be moved downwardly from roller to roller. As this takes place the main portion of the curd will be trans¬ ported downwardly along the staircase of rollers 7 while the main portion of the whey will be drained through the perforations of the rollers and/or the interstices between the rollers wherefrom it will fall down onto an inclined plate 8 along which it will run downwardly to be captured by a forward bottom lip of the plate from where, via a conduit 9, it will be conveyed to a tank (not shown) . The curd and a certain quantity of remaining whey will fall down from lowermost roller 7 into a horizontally elongated funnel 10. The latter is common to a number of vertical tubes 11 corresponding in number and location to cheese molds 2 in each row there- of on cheese reverser 1. Tubes 11, at the bottom thereof, are provided with two stops, viz. an upper stop 12 and a lower stop 13. These stops 12, 13, preferably taking the form of plates blocking tubes 11 and each common to all the tubes, are connected to each its piston- cylinder assembly 14 and 15, respectively, by means of which blocking plates 12 and 13 selectively may be moved into or out of the tubes by a horizontal movement in an insertion or extraction direction. When the curd at the commencement of a cheese pressing operation initially falls down into tubes 11 lower blocking plate 13 initially is inserted in the tubes while upper blocking plate 12 is extracted therefrom. Tubes 11 hence are filled with curd from above and down to lower blocking plate 13. Tubes 11 preferably are perforated to allow whey to escape from the curd, also when the latter is in tubes 11. When tubes 11 have been completely filled upper blocking plate 12 is pushed into the tubes and lower blocking plate 13 is extracted from tubes 11. A piece of curd of a length corresponding to the dis- tance between blocking plates 12 and 13 now falls out of each tube. These are located such that they open immediately above each its open-topped cheese mold 2 in a row thereof on cheese reverser 1. Preferably, the distance between blocking plates 12 and 13 is variable to allow the quantity of curd delivered from tubes 11 to be determined and varied as desired. Contrary to what is the case in hitherto known cheese presses, in the device of the present invention cheese molds 2 are not loosely placed on a base plate on which they are handled in a single plane. Rather, according to the invention, cheese molds 2, preferably consisting essentially of for instance circular tubes having perforated walls and of course dimensioned according to the dimensions desired for the finished cheese, are fixedly attached to a conveyor track 16 consisting of a number of elongated perforated cheese mold bottom plates 17 each preferably common to the cheese molds of each row thereof on conveyor track 16. Preferably, cheese molds 2 are attached to mold bottom plates 17 by being welded thereto. Mold bottom plates 17, resting upon and sliding along longitudinal rails, not shown, at their outer edges are provided with a pair of endless chains 18 laid about two pairs of ver¬ tical sprockets 19 which in each pair are joined by a horizontal shaft. The distance between the pairs of sprockets and the length of the chains of course are selected with regard to the number of mutually adjacent rows of cheese molds 2 that conveyor track 16, or mold reverser 1, is desired to accomodate. Preferably, in the manner shown by the drawing, the upper and lower parts of conveyor track 16 are filled with rows of cheese molds. On the upper part of conveyor 16 cheese molds 2 in their rows are placed with lids 20, provided for the open top ends thereof and pivoted at one top edge there- of, opened and hanging vertically downwardly between them. Filling device 3 is located such above mold reverser 1 so as to not interfere with device 5 for forced pressing curd 0 in molds 2, sprockets 19, of course, being arranged to drive chains 18 in a direc¬ tion causing transport of cheese molds 2 on the top part of conveyor track 16 to take place from filling device 3 to pressing device 5. Like filling device 3 press 5 is located immediately above cheese molds 2 on conveyor track 16. It consists of a press carriage 21 reciprocally movable horizontally, preferably by means of a piston- cylinder assembly 22 and carrying at least one row of piston-cylinder assemblies 23 of a number and location, transversely to conveyor track 16, corresponding to the number and location of molds 2 in the rows of molds on conveyor track 16. The pistons of assembly 23 are vertically reciprocatable and carry horizontal press plates 24 moved upwardly and downwardly in molds 2 by assemblies 23 to press the curd therein. Press carriage 21 which is movable on wheels 24a follows molds 2 in their movement in the direction of transport of conveyor track 16, before returning to a point of origin, for a distance of sufficient length to allow press plates 24 inserted into molds 2 to exert a pressure on the curd for a suitable period of time (about one minute) , with regard to the velocity of conveyor track 16 which, in the embodiment shown, is such that chains 18 will complete a revolution in about 20 minutes. Upon mold rows arriving at the pair of sprockets 19 located downstream of press 5 in the direction of motion of the upper part of the conveyor track 16 molds 2 are moved about the track end formed by the sprockets and are reversed into an upside down attitude in the manner shown by the drawing. At the end of conveyor track 16 in question and at the outer sides thereof there are located a pair of upper guide rails 25 arranged to affect guide pins or, preferably, guide trundles 26 provided at the outer corners of lid 20 in such a manner that, at the moment molds 2 commence arriving at the curved end portion of conveyor track 16 sufficiently for the molds to have begun assume a position wherein they are inclined sufficiently to the vertical for a widened clearance to have been created between inclined molds 2 and the adjacent row of still vertical molds 2, lids 20 are lifted and thereupon swung 270 while molds 2 are being moved towards a more and more upside down attitude so that lids 20 will close the hitherto open top ends of molds 2. In order for lids 20, preferably perforated, to remain in closing position also after molds 2 have moved to be on the lower part of conveyor track 16 and have been completely turned upside down a pair of lower guide rails 27 are also provided below conveyor track 16, guide rails 27 being located and shaped to catch, in the closing position of lids 20, the guide pins or trundles 26 and to continue to exert such load thereupon that lids 20 will remain in closing position. Lids 20 now serve as mold bottoms for as long as molds 2 remain on the lower part of conveyor track 16. Lower guide rails 27 normally extend along the entire lower part of conveyor track 16 and are terminated by an upwardly curved portion at the upstream end of the conveyor track with respect to its upper part so that lids 20 normally, i.e. during as many revolutions, usually 4, as are required for the desired pressing of the curd, are kept closed while molds 2 are on the lower part of conveyor track 16. Each time molds 2 pass the upstream end of conveyor track 16 with respect to the direction of transport of the upper part thereof lids 20 are again opened by a pair of short guide rails 28 provided at the said end. When the pressing has been completed a portion, shown in broken lines at 29, of guide rails 27 is moved out of the way, viz. at the beginning of water basin 4 located below conveyor track 16. Lids 20 will now fall down and will remain hanging while molds 2 are being moved for a distance along the lower part of conveyor track 16 to allow curd 0 in the molds to fall out thereof and down into water basin 4. The molds need'not be emptied by force. The empty molds 2 thereupon continue their motion along conveyor track 16 to be filled again with curd 0 by means of filling device 3. Evidently, the device of the invention permits curd 0, conveniently, in a continuous operation and without the molds having to be handled one at a time manually or by means of special auxiliary devices, to be reversed and processed by pressing on account of its own weight and by forced pressing, and, without anyone having to intervene manually, to be transferred to a water bath in water basin 4 wherein preferably the water is kept flowing in the same direction as the molds are transported on the lower part of conveyor track 16. Those cheeses 0 being in the water bath are moved therein by means of lids 20 of molds 2 hence acting in the water bath as pushers for the cheeses. The fact that the water is maintained flowing in the direction of transport reduces the need of a pushing load so that hanging lids 20 will efficiently act as pushers. The whole apparatus without difficulty may be provided in a closed chamber wherein the temperature and humidity of the air is controlled easily.

Claims: Claims . 1. A device for molding and pressing curd (0) provided with molds (2) constituted by perforated tubes of any selected cross sectional shape and dimen¬ sion, the curd to be molded and pressed to cheeses, characterized in that the molds (2) , on one hand, are fixedly attached to a number of horizontal, perforated, elongated mold bottom plates (17) having each a row of a selected number of molds, the mold bottom plates being mutually pivotably interconnected to form an endless conveyor track (16) at right angles thereto and continuously movable and revolving in vertical planes and having a horizontal upper part wherein the rows of molds are closely adjacent eachother and the molds are standing upright with their free ends defining apertures at the top, and a horizontal lower part wherein the rows of molds are closely adjacent each¬ other and the molds hang with their apertures down- wardly, and,on the other hand, are provided with pre¬ ferably perforated lids (20) adapted, when the molds are in the upper part of the track, to be in positions wherein the apertures of the molds are exposed, and, when the molds are in at least an upstream portion of the lower part of the track, to be in positions where¬ in they close the apertures of the molds, the lids preferably being openable in at least a downstream por¬ tion of the lower part of the track, so that the molds by the track may be caused to selectively carry out revolutions of a selected duration of time and to be reversed, when being transferred from the one to the other part, at selected time intervals and in so doing and when they are in the upper part to expose the interior thereof to an optional device (3) for filling the molds with curd (0) and whey located preferably a short distance downstream of the upstream end of the upper part and above the upper part, as well as to an optional press (5) for forced pressing of the curd in addition to the self-pressing thereof located down¬ stream of the filling device and likewise above the upper part, and, when the molds are in the lower part, preferably to allow the curd to fall down into an optional water basin (4) provided below the lower part and along a downstream portion thereof. 2. The device of claim 1, characterized in that the two short end edges of the mold bottom plates (17) are interconnected by substantially horizontal, flexible, elongated, endless driver members (18) preferably chains, extending at right angles to the mold bottom plates and laid about two pairs of elements (19), preferably sprockets, driving the drivers and provided at the same level and folding the drivers in respective vertical planes, the said pairs of folding and driving elements being located at a mutual distance to allow a desired number of rows of molds to be accomodated on the conveyor track (16) formed by the mold bottom plates and the driver ele¬ ments and transporting the molds. 3. The device of claim 1 or 2, characterized in that the lids (20) are common to all the molds (2) in each row and are pivotable from an open position wherein they hang down along one of the vertical sides of the molds and to a position closing the apertures of the molds, and that a guide rail (25) is provided at the downstream end of the upper part and preferably at both sides of this part, guide pins or guide trundles (26) at the outer corners of the lid being adapted to engage each guide rail, the latter being shaped and located to lift the lids hanging down between the rows of the molds being transported on the upper part at the position where the upper part of the conveyor track (16) is beginning to be transformed into the lower part via the guide pins or the guide trundles so that while the rows of molds are being moved from the upper to the lower part and the molds are being reversed from a position with their apertures at the top to a position with their apertures at the bottom the lids, on account of the moment they obtain while reversing, can swing to the position wherein they close the molds in which position with their guide pins or guide trundles they are captured by a lower guide rail (27) provided preferably at each side of the lower part and extending from the upstream end of the lower part to the down¬ stream end thereof, each lower guide rail being adapted to normally maintain the lids of the reversed molds in a closing position until the molds reach a position where the lower part of the conveyor track is beginning to be transformed into the upper part at which position there is preferably provided at one or both sides of the conveyor track a guide rail (28) for opening the lids in cooperation with the guide pins or the guide trundles. 4. The device of claim 3, characterized in that a portion of the lower guide rail (27) is adapted to be moved out of the way at the upstream end of the water basin (4) so that at the said end thereof the lids (20) selectively may be allowed to drop to open position to permit the finished cheeses to fall out of the molds (2) and down into the water basin the bottom of which is at a level with respect to the lower part of the conveyor track to allow the hanging lids to transport the cheeses being in the water basin therealong, means preferably being provided to cause the water in the basin to flow in the direction in which the molds which are in the lower part are being transported so that the flow of water will assist in tranporting the cheeses in the basin. 5. The device of any preceding claim, characterized in that the device (3) for filling the molds (2) with curd (0) and whey comprises a transverse row of verti- cal, preferably perforated tubes (11) having at the top thereof introduction apertures and at the bottom there¬ of and immediately above the molds discharge apertures. 6. The device of claim 5, characterized in that adjacent the discharge apertures of the tubes (11) there are provided, on one hand, an upper obstruction (12) , preferably in the form of a plate, for each tube or an upper obstruction common to all tubes which by means of one or several piston-cylinder assemblies (14) is horizontally introducible into or extractable out of the tubes, and, on the other hand, a lower obstruction (13), preferably in the form of a plate, for each tube or a lower obstruction common to all tubes which by means of one or several piston-cylinder assemb- lies (15) is horizontally introducible into or extract¬ able out of the tubes, a predetermined portion of the curd poured into the tubes being severable there¬ from by means of the obstructions to be allowed to fall down into the molds. 7. The device of claim 6, characterized in that the vertical distance between the stops (12, 13) is variable. 8. The device of any one of claims 5 - 7, charac¬ terized in that the tubes (11) at their introduction apertures have a funnel (10) preferably common to all tubes and supplied with curd and whey by means of a roller conveyor having horizontal, elongated, preferably perforated and mutually somewhat spaced rollers (7) along the funnel or funnels and arranged to form a staircase the bottom roller being adjacent the funnel or funnels and the top roller being adapted to receive from a horizontal, substantially plane feed funnel (6) curd and whey supplied to the feed funnel from a tank via a conduit. 9. The device of any preceding claim, characterized in that the press (5) for forced pressing the curd comprises at least one transverse row of vertically directed compression pressure exerting means (23, 24) horizontally reciprocatable along the conveyor track (16) above the upper part for exerting compressing pressure to the curd in the molds (2) at selected intervals and for selected lengths of time. 10. The device of claim 9, characterized in that the means exerting compression pressure are constituted by horizontal press plates (24) driven vertically reci- procatably by the piston-cylinder assembly (23) and adapted to be moved down into and pulled out of the molds (2), and supported by a carriage (21) horizontally reciprocatable above the molds along the conveyor track (16) by means of a piston-cylinder assembly, the carriage preferably being movable on rollers (24a) supported by horizontal rails.

Inventors: OESTEMAR PER, OESTEMAR, PER
Applicants: OESTEMAR PER, OESTEMAR, PER
Application year: 1986
Main classification: A01J25
IPC codes: A01J25