FOLDING PROCESS AND DEVICE

Abstract: A process and device for folding a food piece (17) on a conveyor (10) adapted to advance intermittently characterised in that when the conveyor (10) is stationary the food piece (17) is distributed onto the conveyor (10) so that a half-perimeter of the food piece (17) lies on a folding bar (13) positioned above the conveyor (10), whose shape conforms to the said half-perimeter of the food piece (17), the folding bar (13) is rotated 180° to lift up and fold over the half-perimeter so that it lies on the corresponding half-perimeter of the food piece, (17) the folding bar (13) is rotated in the reverse direction and the conveyor (10) is advanced to transport the folded food piece. (17)

Description: The present invention relates to a folding process for a food piece and to a folding device therefore. Certain food pieces such as pancakes or crepes still tend to be folded manually. This is, of course, time and labour consuming as well as unhygienic. We have now devised a process which enables food pieces to be folded automatically which process is rapid and labour saving. Accordingly, the present invention provides a process for folding a food piece on a conveyor adapted to advance intermittently characterised in that when the conveyor is stationary, the food piece is distributed onto the conveyor so that a half-perimeter of the food piece lies on a folding bar positioned above the conveyor, whose shape conforms to the said half-perimeter of the foodpiece, the folding bar is rotated 180°C to lift up and fold over the half-perimeter so that it lies on the corresponding half-perimeter of the food piece, the folding bar is rotated in the reverse direction and the conveyor is advanced to transport the folded food piece. The food piece to be folded is generally flat and symmetrical and may be, for example, a pancake, crepe or omelette or a pie. The food piece may be distributed onto the conveyor by means, e.g. a vacuum distribution head or a vacuum picking head conveniently adapted to reciprocate. For example, when the food piece is a pancake, it may be picked up from the rotating table cavities of the machine in which the pancakes are made by a vacuum distribution head. In other types of pancake making machines where the pancakes are transported out of the machine on a belt a vacuum picking head may be used to transfer the pancakes from the outfeed belt onto the folding bar. The folding bar may be square or round in cross section and may be substantially corrugated or provided with projections so that the edge of the folded food piece has the appearance of being pressed by fingertips. In some cases, it is desirable to place a filling onto the food piece before folding especially for pancakes or crepes. This may be achieved by means of a filling pipe fitted with an applicator and pump. The movements of the various parts are synchronised so that when the conveyor is stationary, the food piece is distributed onto the conveyor, then the folding bar rotates 180°C and after the folding bar has rotated in the reverse direction, the conveyor advances. If the food is filled, the filling is transmitted to the food piece before the folding takes place. After the conveyor has advanced a certain distance to transport the food piece from the folding area, it stops and the sequence is repeated. The present invention also provides a folding device for a food piece comprising a) a conveyor adapted to advance intermittently, b) a folding bar conforming to the shape of a half-perimeter of the food piece, positioned above the conveyor, c) means for distributing the food piece onto the conveyor while the conveyor is stationary so that a half-perimeter of the food piece lies on the folding bar, d) means for rotating the folding bar 180° to lift up and fold over the half-perimeter of the food piece until it lies on the corresponding half-perimeter of the food piece, e) means for rotating the folding bar in the reverse direction, and, f) means for advancing the conveyor to transport the folded food piece away. The axis of rotation of the folding bar is horizontal and transverse to the direction of travel of the conveyor. The present invention will now be illustrated by way of example only, with reference to the accompanying drawings in which Figure 1 represents a top plan diagram of a flat pancake resting on a folding bar, Figure 2 represents a top plan diagram of a folded pancake where the folding bar in Figure 1 has rotated 180°C, Figure 3 represents a diagrammatic side section of a pancake placed on a folding device above a conveyor, Figure 4 represents a diagrammatic side section of a filling placed on the pancake, Figure 5 represents a diagrammatic side section of a pancake with a filling partially folded by the rotation of the folding bar, Figure 6 represents a diagrammatic side view of a folded pancake, and Figure 7 represents the folding bar rotating in the reverse direction away from the pancake. The folding device comprises a conveyor belt 10 adapted to advance intermittently to the right as shown in Figures 3 to 7 trained around rollers 11, 12. A folding bar 13 with ends 14, 15 adapted to reciprocate 180° as represented by the arrows in Figure 1, 5, 6 and 7, is positioned just above the conveyor belt 10. A reciprocating vacuum distribution head 16 is positioned above the folding bar 13 and descends to distribute a flat pancake 17 which it has picked up from a rotating table cavity of a Lücon pancake making machine (not shown) onto the conveyor belt 10 when it is stationary so that the half-perimeter 18 overlies the folding bar 13. The vacuum head then ascends, a filling pipe 19 feeds a filling material 20 onto the pancake and then the folding bar 13 rotates 180° by means of a reciprocating motor (not shown) pushing up the half-perimeter 18 of the pancake and folding it over so that the half-perimeter 18 overlies the corresponding half-perimeter of similar shape to give a folded, filled pancake 21. The folding bar then rotates 180° in the reverse direction and the conveyor belt 10 advances to transport the folded pancake away before stopping. The vacuum distribution head 16 then descends again to distribute another flat pancake onto the conveyor and the process is repeated. When the folding bar is corrugated in shape the joined edges of the folded pancakes have the appearance of having been pressed with the fingertips.

Claims: A process for folding a food piece (17) on a conveyor (10) adapted to advance intermittently characterised in that when the conveyor (10) is stationary the food piece is distributed onto the conveyor so that a half-perimeter (18) of the food piece lies on a folding bar (13) positioned above the conveyor (10), whose shape conforms to the said half-perimeter (18) of the food piece, the folding bar (13) is rotated 180° to lift up and fold over the half-perimeter (18) so that it lies on the corresponding half-perimeter of the food piece, the folding bar is rotated in the reverse direction and the conveyor is advanced to transport the folded food piece. A process according to claim 1 characterised in that the food piece (17) is a flat pancake. A process according to claim 1 characterised in that the food piece (17) is distributed onto the conveyor (10) by means of a reciprocating vacuum distribution head (16) or vacuum picking head. A process according to claim 1 characterised in that the folding bar (13) is substantially corrugated so that the edge of the folded food piece has the appearance of being pressed by fingertips. A process according to claim 1 characterised in that before folding, a filling is placed on the food piece (17). A folding device for a food piece (17) comprising a) a conveyor (10) adapted to advance intermittently, b) a folding bar (13) conforming to the shape of a half-perimeter (18) of the food piece (17), positioned above the conveyor (10), c) means for distributing (16) the food piece (17) onto the conveyor (10) while the conveyor (10) is stationary so that a half-perimeter of the food piece lies on the folding bar (13), d) means for rotating the folding bar (13) 180° to lift up and fold over the half-perimeter (18) of the food piece (17) until it lies on the corresponding half-perimeter of the food piece (17), e) means for rotating the folding bar in the reverse direction, and f) means for advancing the conveyor to transport the folded food piece away. A folding device according to claim 6 characterised in that the means for distributing the food piece (17) onto the conveyor (10) is a reciprocating vacuum distribution head (16) or vacuum picking head. A folding device according to claim 6 characterised in that there is provided means for feeding (19) a filling onto the food piece (17) before folding. A folding device according to claim 6 characterised in that the axis of rotation of the folding bar (13) is horizontal and transverse to the direction of travel of the conveyor (10).

Inventors: WADELL, LARS GUSTAF ALBERT
Applicants: FRISCO-FINDUS AG
Application year: 1990
Main classification: A21C9
IPC codes: A21C9