| 摘要 |
<p>Each zone is electrically heated and thermostatically controlled. The zones are stacked vertically within a common enclosure and a conveyor path carries baking trays sequentially through the zones in a series of horizontal runs. - The upstream zone is at the bottom of the stack and is separated from the second zone by a thermally insulating baffle. Similarly, a baffle insulates the second and third zones. - The appts. is compact yet the zones are thermally insulated. In particular, bread in the first zone is shielded from heat radiated downwards from the second zone to prevent premature cooking of the tops of the loaves. (0/6) EPAB- EP-101169 B An oven comprising a baking chamber (12) having an inlet (48) which communicates with a lower region of the chamber, an outlet (52) which communicates with an upper region of the chamber, an endless coveyor (18) extending through the chamber (12) and directed to follow a generally serpentine path which includes a plurality of horizontal passes (30 to 34) at successively higher levels in the chamber (12), product support trays (36) carried by the conveyor (18) at spaced intervals along the length of the conveyor, banks of horizontally disposed electric heating elements (38 to 41) located at levels between the respective horizontal passes (30 to 34) of the conveyor, sensing means (46) for controlling current flow to the heating elements whereby the temperature level in the various regions may be maintained substantially in that the inlet (48) to the chamber (12) is in the form of a horizontally extending first tunnel (48) which is located in the lowermost region of the chamber (12), in that the tunnel (48) has a roof (49) which constitutes a first heat shield, in that the first heat shield (49) is located below the lowermost bank of heating elements (38) to prevent heat from being radiated downwardly onto the product support trays during their conveyance through the tunnel (48), and in that a second tunnel (51) is located within the lower region of the chamber (12) immediately above the first tunnel (48), the second tunnel (51) extending in a direction opposite to that of the first tunnel and having a roof (50) which constitutes a second heat shield. - (13pp) - EP-101169 B An oven comprising a baking chamber (12) having an inlet (48) which communicates with a lower region of the chamber, an outlet (52) which communicates with an upper region of the chamber, an endless coveyor (18) extending through the chamber (12) and directed to follow a generally serpentine path which includes a plurality of horizontal passes (30 to 34) at successively higher levels in the chamber (12), product support trays (36) carried by the conveyor (18) at spaced intervals along the length of the conveyor, banks of horizontally disposed electric heating elements (38 to 41) located at levels between the respective horizontal passes (30 to 34) of the conveyor, sensing means (46) for controlling current flow to the heating elements whereby the temperature level in the various regions may be maintained substantially in that the inlet (48) to the chamber (12) is in the form of a horizontally extending first tunnel (48) which is located in the lowermost region of the chamber (12), in that the tunnel (48) has a roof (49) which constitutes a first heat shield, in that the first heat shield (49) is located below the lowermost bank of heating elements (38) to prevent heat from being radiated downwardly onto the product support trays during their conveyance through the tunnel (48), and in that a second tunnel (51) is located within the lower region of the chamber (12) immediately above the first tunnel (48), the second tunnel (51) extending in a direction opposite to that of the first tunnel and having a roof (50) which constitutes a second heat shield. (13pp) USAB- US4517447 A Oven comprises a chamber in which an endless conveyor a serpentine path in a no. of passes at different horizontal levels, electric heating elements between each of the passes, and temp. sensors in various regions. - The sensors control current flow to the heating elements. Tunnels are disposed in the lower region of the chamber to prevent heat radiating onto the products during the - first stage of conveyance. - (11pp)</p> |
