A roasting drum has a main body and at least one opening formed through the main body. The main body has a first end, a second end opposite the first end, and multiple drums. The multiple drums are mounted around one another in sequence, are fastened to one another, and communicate with one another. Each one of the multiple drums has a blending blade formed on an inner surface of the drum. The blending blade is spiral and extends from the first end toward the second end. The blending blade of one of the multiple drums twists along a clockwise direction from the first end toward the second end. The blending blade of another one of the multiple drums that is mounted around the drum twists along a counter-clockwise direction from the first end toward the second end.

A roasting drum has a main body and at least one opening formed through the main body. The main body has a first end, a second end opposite the first end, and multiple drums. The multiple drums are mounted around one another in sequence, are fastened to one another, and communicate with one another. Each one of the multiple drums has a blending blade formed on an inner surface of the drum. The blending blade is spiral and extends from the first end toward the second end. The blending blade of one of the multiple drums twists along a clockwise direction from the first end toward the second end. The blending blade of another one of the multiple drums that is mounted around the drum twists along a counter-clockwise direction from the first end toward the second end.

A bean roasting system includes a roasting chamber, a blower, a variable diverter and a controller. The roasting chamber, the blower and the variable diverter each is disposed at least partially within a recirculating gas flow path. The blower is configured to provide a flow stream of gas through the recirculating gas flow path. The variable diverter is configured to split the gas flow path into at least two flow paths including a treated flow path and a bypass flow path. The treated flow path includes a series arrangement of a gas heater and a catalytic converter. The variable diverter is configured to control a percentage of a flow stream of gas that is diverted into the bypass flow path. The controller is configured to activate different predetermined operating modes for the bean roasting system by controlling a state of the variable diverter and a state of the heater.

A bean roasting system includes a roasting chamber, a blower, a variable diverter and a controller. The roasting chamber, the blower and the variable diverter each is disposed at least partially within a recirculating gas flow path. The blower is configured to provide a flow stream of gas through the recirculating gas flow path. The variable diverter is configured to split the gas flow path into at least two flow paths including a treated flow path and a bypass flow path. The treated flow path includes a series arrangement of a gas heater and a catalytic converter. The variable diverter is configured to control a percentage of a flow stream of gas that is diverted into the bypass flow path. The controller is configured to activate different predetermined operating modes for the bean roasting system by controlling a state of the variable diverter and a state of the heater.

A countertop appliance and coffee roaster (10) with a roasting chamber containing at least one heating element (30), a bean container (12), and an exhaust duct (22) for venting said roasting chamber. The countertop appliance and coffee roaster (10) may include a cooling duct (42) for cooling the beans at the conclusion of the roasting cycle. The exhaust duct (22) may contain an exhaust fan (72), secondary heating elements (74), and/or exhaust duct vents (20).

A countertop appliance and coffee roaster (10) with a roasting chamber containing at least one heating element (30), a bean container (12), and an exhaust duct (22) for venting said roasting chamber. The countertop appliance and coffee roaster (10) may include a cooling duct (42) for cooling the beans at the conclusion of the roasting cycle. The exhaust duct (22) may contain an exhaust fan (72), secondary heating elements (74), and/or exhaust duct vents (20).

An apparatus for roasting and cooling loose products includes an oven with a housing including an upper and a lower section with glass doors. The apparatus has an air and a gas distribution grid connected to the upper and lower sections. In addition, the apparatus includes a high-pressure ventilator in the upper section having an outlet connected to the air duct, a rotor drum installed over the gas distribution grid, a feeding tray located in the upper section, a heater located in the lower section and configured to heat air and a hopper located on top of the housing above the rotor drum and configured to feed the loose products into the oven. The hopper includes one or more strain gauges configured to weigh the loose products. An opening located adjacent the hopper intakes fresh air intake and outtakes humidified air and a horizontal cooler chills the loose products.

An apparatus for roasting and cooling loose products includes an oven with a housing including an upper and a lower section with glass doors. The apparatus has an air and a gas distribution grid connected to the upper and lower sections. In addition, the apparatus includes a high-pressure ventilator in the upper section having an outlet connected to the air duct, a rotor drum installed over the gas distribution grid, a feeding tray located in the upper section, a heater located in the lower section and configured to heat air and a hopper located on top of the housing above the rotor drum and configured to feed the loose products into the oven. The hopper includes one or more strain gauges configured to weigh the loose products. An opening located adjacent the hopper intakes fresh air intake and outtakes humidified air and a horizontal cooler chills the loose products.

A baking device with uniform heating application comprises a frame, a roller assembly, and a heater. The roller assembly is supported by the frame. The roller assembly comprises a rotatable inner cylinder and a rotatable outer cylinder. The inner cylinder defines a plurality of first through holes that connect inner and outer surfaces of the inner cylinder. The inner cylinder encloses a hollow space that forms a heating zone. The outer cylinder has a plurality of second through holes that connect inner and the outer surfaces of the outer cylinder. The outer cylinder is arranged circumferentially outside and surrounds the inner cylinder. A baking zone of the baking device is formed between the inner and outer cylinders. The heater connected to the frame and arranged in the heating zone.

A baking device with uniform heating application comprises a frame, a roller assembly, and a heater. The roller assembly is supported by the frame. The roller assembly comprises a rotatable inner cylinder and a rotatable outer cylinder. The inner cylinder defines a plurality of first through holes that connect inner and outer surfaces of the inner cylinder. The inner cylinder encloses a hollow space that forms a heating zone. The outer cylinder has a plurality of second through holes that connect inner and the outer surfaces of the outer cylinder. The outer cylinder is arranged circumferentially outside and surrounds the inner cylinder. A baking zone of the baking device is formed between the inner and outer cylinders. The heater connected to the frame and arranged in the heating zone.