the invention will now be explained in more detail , and specific preferred embodiments , and variations of these , will be shown . the explanations are intended for illustrative and explanatory purposes and are not to be seen in any way as limiting the scope of the invention . the illustrations are schematic and all details are not illustrated , and all illustrated details may not be necessary for the invention . a specific embodiment of the invention will now be discussed with reference to fig1 a and 1 b . a cooking device 1 according to the invention is illustrated in fig1 a and 1 b . the product conveyor 2 is horizontally mounted and runs through a cooking chamber 3 ( illustrated as a see - through box for improving the clarity ). a shape - controlling belt 4 is positioned on top of the product conveyor . the shape - controlling belt 4 is an endless belt made of stain - less steel , and the belt 4 has a slack 5 which makes it hang down towards the product conveyor 2 . a lifting member 7 comprising two support lines , in this example being chains 8 a and 8 b , supporting a structure comprising transversal spaced apart rods 9 ( of which only one rod is pointed out in the figure ). although the chains 8 a and 8 b are illustrated as lines , for improved clarity , it should be realised that the chains may comprise links . in this example there are nine rods 9 , but there may be fewer or more rods 9 . for example there may be 28 rods . the number of rods may vary depending on the length of the shape controlling belt . each one of the chains 8 a and 8 b is supported on a rail ( not illustrated ) which is mounted on an inside wall of the cooking chamber 3 . in this example , the chains 8 a and 8 b are further positioned and stretched by shafts comprising cogs 12 a , 12 b , 12 c and 12 d ( only illustrated in fig1 a ), running transversal to the elongation of the product conveyor 2 . other means may be used for positioning and stretching the chains 8 a and 8 b , such as cog wheels , shafts without cogs , loops , or other suitable means . it may also be possible to operate the device according to the invention without any such means for positioning and stretching the support lines . the lifting member further comprises moving members in the form of two rolls 6 a , 6 b . the rolls 6 a and 6 b comprise an axis 11 a and 11 b , respectively . in fig1 a and 1 b , the spaced apart rods are illustrated positioned rolled up on the rolls , and not inserted between the shape - controlling belt and the product conveyor . as a result of this , combined with the fact that the chains 8 a and 8 b are positioned at a distance from the side of the shape - controlling belt , the shape - controlling belt is slacking and is in the first position . thus , the device , as illustrated in fig1 a and 1 b , is adapted for shape - controlled cooking . shifting a part of the lower work path from a first position to a second position , thus shifting the cooking device from being adapted for shape - controlled cooking to non - shape - controlled cooking will now be discussed with references to fig1 a and 1 b . the rolls 6 a and 6 b are rotatable according to this example , for example by means of an electric motor and a gear unit ( not illustrated ), and when the rolls 6 a , 6 b are rotated anti - clockwise , the roll 6 a is unwinding the chains 8 a and 8 b and the rods 9 , while simultaneously roll 6 b is winding the chains 8 a and 8 b . thus , the chains 6 a and 6 b and the rods will be motioned in a direction from left to right in the illustration . it is realised that the rotating can be turning . the chains 8 a and 8 b and the rods 9 are arranged at a distance above the product conveyor 2 . when the rods 9 reaches the nip 13 formed between the shape - controlling belt 4 and the product conveyor 2 , the rods 9 will enter the nip transversal to the elongation of the product conveyor 2 , and as a result of said distance above the product conveyor 2 , the rods 9 will force or lift the slack 5 of the shape - controlling belt 4 upwards and the work - path of the shape - controlling belt 4 will thus be elevated to a higher distance above the product conveyor 2 , corresponding to shifting of the lower work - path from the first position to the second position . in fig1 a and 1 b the first position is illustrated . the rods 9 , which in this example are rotatably attached to the chains 8 a and 8 b , will rotate and thereby decreasing the friction between the rods 9 and the lower work path , allowing for smoother operation , a longer lasting cooking device , and reduced risk of scraping off foodstuff residues or material from the shape - controlling belt . the second position is described below with references to fig2 a or 2 b . fig2 a and 2 b illustrate the same cooking device as is illustrated in fig1 a and 1 b , and the difference between fig1 a and 1 b on one hand and 2 a and 2 b on the other hand , is that fig1 a and 1 b illustrate the cooking device with the lower work - path in the first position ; and fig2 a and 2 b illustrate the lower work - path in the second position . in fig2 a and 2 b , the chains 8 a and 8 b and the rods 9 have been motioned in a direction from left to right in the illustration , as compared with fig1 a and 1 b , and the rods 9 , thus , have been moved from being wound on the roll 6 a to being positioned between the product conveyor 2 and the shape - controlling belt 4 , where the rods 9 are engaged with a part of the lower work path of the shape - controlling belt , such that it is lifted and is in the second position . the cooking device is thus adapted for non - shape - controlled cooking . as can be seen from the inset , the lower work path of the shape - controlling belt 4 , according to this example , may be hanging down between the rods 9 . during non - shape - controlled cooking according to the invention , the chains 8 a and 8 b and the rods 9 will be held essentially motionless in the illustrated positions , but the product conveyor will be moving . the shape - controlling belt may be moving or not moving . if the rolls 6 a and 6 b are rotated in clock - wise direction , the chains 8 a and 8 b and the rods 9 would be motioned to the left in the illustration . the rods 9 would leave their position between the product conveyor 2 and the lower work path of the shape - controlling belt 4 . thus , the lower work path of the shape - controlling belt 4 would not be elevated by the rods 9 and , as a result would slack and shift from the second position to the first position . thus , the cooking device would shift from being adapted for non - shape - controlled cooking to shape - controlled cooking . with reference to fig3 , shape - controlled baking of bacon is being discussed below . shape - controlled baking of bacon , using the device according to the invention , results in bacon which has a flat appearance , in contrast to the wavy appearance typical to bacon being baked without shape - control . fig3 illustrates a cooking device 1 according to the invention with the lower work path in the first position , and thus a slack 5 of the lower work path of the shape - controlling belt . the lower work path is in the first position as a result of the rods 9 not being positioned between the product conveyor 2 and the lower work path of the shape controlling belt 4 . several rods 9 can be seen rolled up on roll 6 a , and two rods 9 being outside the roll 6 a . it is realised that all rods 9 could have been rolled up on roll 6 a , but that , for this example , it is important that the rods are not positioned between the shape - controlling belt 4 and the product belt 2 . the chains 8 a and 8 b are illustrated running alongside , but at a distance from , the shape controlling belt 4 . the foodstuffs in this example are slices of bacon 10 ( of which only one slice is pointed out in the figure ). the slices of bacon 10 are positioned on the product conveyor 2 . the product conveyor 2 is motioned such that the slices of bacon 10 are moved to the right in the illustration . the lower work path of the shape - controlling belt 4 is moving at the same speed as the product conveyor 2 and the slices of bacon 10 . the slices of bacon 10 will before entering the cooking chamber 3 enter between the product conveyor 2 and the shape - controlling belt 4 and be sandwiched between the two , and the slices of bacon 10 will be in contact with the shape - controlling belt . the slices of bacon 10 are conveyed into the cooking chamber 3 where they are heated and baked . the slices of bacon 10 are limited upwards by the shape - controlling belt and the shape of the slices of bacon 10 are thus controlled , and the slices of bacon 10 are thus not becoming wavy during the baking . slices of bacon 10 appearing flat are of interest , for example , when positioned on top of hamburgers . for some purposes the slices of bacon 10 are visible when eaten and it is desired that they have a wavy appearance to look appetising . the device according to the invention can be used for efficient baking of both flat and wavy bacon . after flat bacon has been cooked as discussed above , the lower work path may , according to the invention , efficiently be shifted from the first position to the second position ( not illustrated ) and bacon may be baked such that the slices of bacon 10 obtain a wavy appearance . in the example discussed directly above , there exists a continues movement of the product conveyor and the shape - controlling belt , and thus a continuous movement of slices of bacon 10 through the cooking chamber 3 , and the cooking process may be regarded as a continuous cooking process . new slices of bacon 10 are positioned on the product conveyor at the same pace as the slices of bacon 10 are conveyed into the cooking chamber 3 . the cooking device 1 can also be used for batch cooking , in which a batch of slices of bacon 10 would be positioned on the product conveyor and conveyed into the cooking chamber 3 where they are baked . during this baking the movement of the product conveyor 2 and the shape - controlling belt 4 may be stopped during the baking , and started again when the baking is finished , or nearly finished , to convey the slices of bacon 10 out from the cooking chamber 3 , while at the same time possibly conveying other , un - cooked , slices of bacon 10 positioned upstream the cooking chamber 3 into the cooking chamber 3 . after being conveyed out of the cooking chamber 3 , the slices of bacon 10 may be subjected to further treatment , for example seasoning or packing .
the present invention relates to a cooking device for cooking of foodstuffs , comprising a cooking chamber , a product conveyor , a shape - controlling belt , and a lifting member , the product conveyor being arranged to convey said foodstuffs through said cooking chamber , the shape - controlling belt being an endless belt extending along an upper return path , and a lower work path , the lifting member being arranged to shift a part of the lower work path between a first position in which the belt extending along said part is slacking and is adopted to contact said foodstuffs on the product conveyor , and a second position in which the belt extending along said part is adopted to be separated from said foodstuffs on the product conveyor . the invention further relates to a method for switching a cooking device between being adapted for shape - controlled cooking and non - shape - controlled cooking of food - stuffs , and use of the cooking device .