COATING DEVICE WITH SIEVING MEANS

Abstract: An apparatus for coating a foodstuff with a particulate material comprising a conveyor belt for transporting the foodstuff, a supply means for the particulate material positioned above the conveyor belt and a sieving means positioned between the supply means and the conveyor belt capable of retaining any lumps of particulate material above a certain size while allowing the particulate material to pass through directly onto the conveyor belt for transporting the foodstuff.

Description: The present invention relates to an apparatus and method of coating a foodstuff with a particulate material. During the coating of foodstuffs such as frozen fish or ice cream with particulate crumb material, the crumbs tend to form lumps which affect the quality of the final coated product. All types of crumbs form lumps when exposed to moisture such as steam, batter drip or ice cream dip. In addition, deep-frozen crumbs form lumps when exposed to the environmental air temperature. DE-A-2653678, DE-C-589057, US-A-4497244 describe apparatus for covering foodstuffs with particulate material where the particulate material passes through a sieving means onto the foodstuff as it travels on a conveyor belt. We have devised a simple apparatus and method of separating the lumps and transporting them out of the apparatus without any contact with the foodstuff. Accordingly the present invention provides an apparatus for coating a foodstuff with a particulate material comprising a conveyor belt for transporting the foodstuff, a supply means for the particulate material positioned above the conveyor belt and a sieving means positioned between the supply means and the conveyor belt capable of retaining any lumps of particulate material above a certain specific size while allowing the particulate material below a certain specific size to pass through directly onto the conveyor belt for transporting the foodstuff characterised in that there is provided means for transporting the lumps above a certain specific size out of the apparatus transversely to the direction of travel of the conveyor belt for transporting the foodstuff. One convenient sieving means comprises an endless wire mesh belt positioned transversely to the conveyor belt for transporting the foodstuff, whose upper run travels above and transversely to the upper run of the conveyor belt for transporting the foodstuff and whose lower run travels below either the upper run or the lower run of the conveyor belt for transporting the foodstuff so that the clumps are caught on the wire mesh belt and carried sideways from the apparatus. Another convenient sieving means comprises a horizontal oscillating fork which oscillates transversely to the direction of travel of the conveyor belt for transporting the foodstuff so that the lumps are caught on the fork and carried sideways from the apparatus. Preferably the prongs of the horizontal oscillating fork lie parallel to the longitudinal direction of travel of the conveyor belt for transporting the foodstuff. Advantageously, just before the reversal of direction, the oscillating fork rotates and passes through a vertical fixed fork for cleaning before rotating to its original position. Preferably, the prongs of the vertical fixed fork lie parallel to the conveyor belt for transporting the foodstuff. In these sieving means of the present invention the pitch of the meshes of the wire belt or the distance between the prongs of the oscillating fork are of a size to retain the lumps while allowing the particulate material to pass through e.g. from 2 to 15 mm. It goes without saying that if a foodstuff is on the conveyor belt, particulate material will fall onto the foodstuff. The present invention also provides a method for coating a foodstuff with a particulate material which comprises feeding a supply of particulate material onto a conveyor belt transporting the foodstuff from a supply means positioned above the conveyor belt transporting the foodstuff and sieving the particulate material by a sieving means positioned between the supply means and the conveyor belt so that lumps of particulate material above a certain specific size are retained by the sieving means while particulate material below a certain specific size passes through the sieving means directly onto the conveyor belt transporting the foodstuff characterised in that the lumps above a certain specific size are transported out of the apparatus transversely to the direction of travel of the conveyor belt for transporting the foodstuff. The present invention will now be further illustrated by way of example only with reference to the accompanying drawings in which Figure 1 represents a diagrammatic side sectional view of an apparatus wherein a transverse wire belt is used as the sieving means, Figure 2 represents a view of Figure 1 looking in the direction of the arrows A-A, Figure 3 represents a diagrammatic side sectional view of an apparatus wherein an oscillating fork is used as the sieving means, Figure 4 represents a top plan view of Figure 3 excluding the conveyor for the crumbs, Figure 5 represents a side view of Figure 3 looking in the direction of the arrows B-B and, Figure 6 represents a schematic view of the path of the oscillating fork. Referring to Figures 1 and 2 of the drawings the apparatus comprises a conveyor belt 10 transporting bread crumbs 11 which fall through the upper run 12 of transversely running endless wire mesh conveyor belt 13 onto the upper run of the conveyor belt 14 carrying frozen fish pieces 15. The size of the gaps in the meshes of conveyor belt 13 are small enough to retain any lumps 16 present in the bread crumbs and since it is travelling transversely the lumps are transported sideways out of the apparatus where they fall off the belt and are collected. Referring to Figures 3, 4, 5 and 6 of the drawings the apparatus comprises a conveyor belt 17 transporting bread crumbs 18 which fall through the gaps between the prongs of a horizontally oscillating fork 19 driven by a pneumatic cylinder 20 to oscillate along a path indicated X-Y in Figure 6 transversely to the direction of travel of a conveyor belt 21 carrying frozen fish pieces 22, the lumps 23 being retained by the prongs of the oscillating fork 19. In Figure 6, the oscillating fork 19 is travelling towards a fixed fork 24 at the end of the path Y and just before the reversal of direction of the oscillations the fork 19 rotates 90° by means of a turnstile 25 turned by a fixed pin 26 so that it passes lower side first through the fixed fork 24. The lumps 23 on the upper side of the oscillating fork 19 fall off and are collected and the oscillating fork 19 rotates back to its original horizontal oscillating position whereupon it travels in the reverse direction along the path to the end X where another fixed fork is positioned and the cleaning process is repeated. The oscillating fork 19 is prevented from rotating during its travel along the path between the ends X and Y by means of a plate spring 27 which prevents a dice 28 on the fork shaft 29 from turning.

Claims: An apparatus for coating a foodstuff (15,22) with a particulate material (11 comprising a conveyor belt (14,21) for transporting the foodstuff (15,22), a supply means (10,17) for the particulate material (11 positioned above the conveyor belt (14,21) and a sieving means (13,19) positioned between the supply means (10,17) and the conveyor belt capable of retaining any lumps of particulate material above a certain specific size while allowing the particulate material below a certain specific size to pass through directly onto the conveyor belt (14,21) for transporting the foodstuff characterised in that there is provided means (13,19) for transporting the lumps above a certain specific size out of the apparatus transversely to the direction of travel of the conveyor belt (14,21) for transporting the foodstuff. An apparatus according to claim 1 wherein the sieving means comprises an endless wire mesh belt (13) positioned transversely to the conveyor belt (14) for transporting the foodstuff (15), whose upper run (12) travels above and transversely to the upper run of the conveyor belt (14) for transporting the foodstuff (15) and whose lower run travels below either the upper run or the lower run of the conveyor belt for transporting the foodstuff so that the lumps are caught on the wire belt (13) and carried sideways from the apparatus. An apparatus according to claim 1 wherein the sieving means comprises a horizontal oscillating fork (19) which oscillates transversely to the direction of travel of the conveyor belt (21) for transporting the foodstuff (22) so that the lumps are caught on the fork (19) and carried sideways from the apparatus. An apparatus according to claim 3 wherein the prongs of the oscillating fork (19) lie parallel to the longitudinal direction of travel of the conveyor belt (21) for transporting the foodstuff (22) An apparatus according to claim 3 wherein just before the reversal of direction of the oscillation, the oscillating fork (19) is adapted to rotate and pass through a vertical fixed fork (24) for cleaning and then rotate back to its original position. An apparatus according to claim 5 wherein the prongs of the vertical fixed fork (24) lie parallel to the conveyor belt (21) for transporting the foodstuff (22). A method for coating a foodstuff (15,22) with a particualte material (11,18) which comprises feeding a supply of particulate material (11,18) onto a conveyor belt (14,21) transporting the foodstuff (15,22) from a supply means (10,17) positioned above the conveyor belt (14,21) transporting the foodstuff (15,22) from a supply means (10,17) positioned above the conveyor belt (14,21) transporting the foodstuff (15,22) and sieving the particulate material (11,18) by a sieving means (13,19) positioned between the supply means and the conveyor belt so that lumps of particulate material (11,18) above a certain specific size are retained by the sieving means (13,19) while particulate material below a certain specific size passes through the sieving means (13,19) directly onto the conveyor belt (14,21) transporting the foodstuff (15,22) characterised in that the lumps above a certain specific size are transported out of the apparatus transversely to the direction of travel of the conveyor belt (14,21) for transporting the foodstuff.

Inventors: WADELL, LARS GUSTAF ALBERT
Applicants: FRISCO-FINDUS AG
Application year: 1990
Main classification: A23P1
IPC codes: A23G9, A23G3, A23P1, B07B1, A21C9, B05C19, A23L1