A coffee machine device

Abstract

A coffee making apparatus has a body with a drip tray and a removable water tank for supplying water to a heating system of the apparatus. The water tank is built-in to the apparatus and removable by a user. The body has a fluid refill opening which directs fluid to the water tank. The water tank includes an overflow channel or tube which diverts into the drip tray.

Description

[0001] This application is a divisional application of Chinese Patent Application No. 201280022617.2, filed May 10, 2012, entitled "Apparatus and Method for Improved Coffee Maker". TECHNICAL FIELD

[0002] The present invention relates to a coffee maker apparatus and jug apparatus, and in particular to adjustable control of a coffee maker apparatus.

[0003] The present invention has been developed in response to a need for a coffee maker apparatus and jug apparatus, which will be described hereinafter with reference to the present application. However, it is to be understood that the present invention is not limited to this particular application. BACKGROUND

[0004] Any discussion of the background of the application herein is intended only to aid in understanding the application and is not admitted to be prior art.

[0005] In the process of making an espresso coffee, known espresso coffee makers control both the water pressure and the volume of water introduced. It will be appreciated that the water pressure is typically set between 9 and 10 bar, and the volume is typically 30ml, with the water being introduced over a period of 20 to 40 seconds.

[0006] A pre-infusion stage is employed to infuse the coffee powder to allow the powder to expand in a filter basket, thereby assisting in capturing fine powder and limiting water from following through the filter. To prevent the infusion process from passing water through the coffee powder, the pressure of the water introduced during the pre-infusion stage is typically between 1 and 5 bar.

[0007] It is desirable to provide an efficient method and apparatus to provide a portion of espresso coffee with regulated pressure and volume. It is also desirable to provide an efficient method and apparatus to enable a water pump of an espresso coffee maker to introduce a controlled low pressure pre-infusion.

[0008] It is known that espresso coffee makers also have a steam wand. The steam wand emits steam which can be used, for example, to heat or froth milk. In some machines, the steam outlet is regulated by a valve, such as a needle valve. The needle valve provides a variable steam outlet, but it must be rotated through a number of turns to operate from a closed state to a fully open state.

[0009] Accordingly, it is also desirable to provide a steam output control which is easier to use than a needle valve.

[0010] OBJECT OF THE INVENTION

[0011] It is an object of the present invention to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative.

[0012] It is an object of some embodiments of the present invention, in a preferred form, to provide an improved coffee maker. It is an object of some embodiments of the present invention, in a preferred form, to provide an improved espresso coffee maker.

[0013] It is an object of some embodiments of the present invention, in a preferred form, to provide an espresso coffee maker capable of providing a shot of coffee with regulated pressure and volume.

[0014] It is an object of some embodiments of the present invention, in a preferred form, to provide an espresso coffee maker capable of achieving a controllable low pressure pre-infusion.

[0015] It is a further object of the present invention, in a preferred form, to provide an espresso coffee maker that provides a more rational alternative to the needle valve controller of the steam outlet. SUMMARY

[0016] According to an aspect of the present invention, there is provided a flow measurement device for metering a generated flow resulting from a water pump connected to an overpressure valve, the device comprising:

[0017] a first flow meter for metering a feed flow fed to the water pump;

[0018] a second flow meter for metering a back flow of the overpressure valve; and wherein the generated flow resulting from the water pump can be determined by subtracting the measured back flow from the measured feed flow.

[0019] Preferably, the generated flow can be determined (or calculated) in real time and the determined flow can be used to terminate the operation of the water pump when the appropriate dose is delivered.

[0020] According to an aspect of the present invention, there is provided an espresso coffee maker comprising a flow measurement device as disclosed herein for metering a shot delivered by a water pump connected to an overpressure valve. Preferably, the espresso coffee maker further comprises a water pump power correction module as disclosed herein for providing a pre-infusion.

[0021] According to an aspect of the present invention, there is provided an espresso coffee maker comprising a water pump power correction module as disclosed herein for providing a pre-infusion. Preferably, the espresso coffee maker further comprises a flow measurement device as disclosed herein for metering a shot delivered by a water pump connected to an overpressure valve.

[0022] Preferably, the water pump power correction module can activate a pressure profile during an espresso making cycle. More preferably, the pressure profile can be pre-set or configured by a user. Most preferably, the pressure profile can take the form of a power-time profile to indicate the form of power delivered to the water pump.

[0023] According to an aspect of the present application, there is provided a method of flow measurement for metering a resulting flow delivered by a water pump connected to an overpressure valve, the method comprising the steps of:

[0024] metering a feed flow fed to the water pump using a first flow meter;

[0025] metering a return flow returned from the overpressure valve using a second flow meter; and

[0026] calculating the resulting flow at least partly by subtracting the measured return flow from the measured feed flow.

[0027] Preferably, the calculation of the resulting flow is performed in real time for terminating the operation of the water pump when a proper dose is completed.

[0028] According to an aspect of the present application, there is provided an espresso coffee maker comprising a processor device adapted to perform a flow metering method as disclosed herein for metering a shot dose delivered by a water pump connected to an overpressure valve.

[0029] According to a method of the present application, there is provided a device for controlling overflow from a fluid reservoir, the device comprising:

[0030] a body;

[0031] a removable fluid reservoir;

[0032] a fluid refill aperture in fluid communication with the reservoir; and

[0033] a drip tray, wherein the reservoir comprises an overflow aperture in fluid communication with the drip tray.

[0034] According to an aspect of the present application, there is provided an espresso coffee maker comprising:

[0035] an espresso coffee maker body;

[0036] a removable water tank;

[0037] a refill aperture disposed in a front or top portion of the espresso coffee maker and in fluid communication with the water tank;

[0038] a front-loading drip tray;

[0039] wherein the water tank comprises an overflow aperture in fluid communication with the drip tray.

[0040] Preferably, the water tank is disposed from a rear portion of the espresso coffee maker body.

[0041] Alternatively, the water tank is preferably inserted from the side of the espresso machine body.

[0042] According to an aspect of the present application there is provided an apparatus for receiving a removable fluid reservoir, the apparatus comprising:

[0043] a body; and

[0044] a removable fluid reservoir, wherein the reservoir comprises a lock assembly and a fluid pressure relief valve.

[0045] According to an aspect of the present application there is provided an espresso machine, comprising:

[0046] an espresso machine body;

[0047] a removable water tank;

[0048] wherein the water tank comprises a lock assembly and a fluid pressure relief valve.

[0049] Preferably, the water tank is inserted from the rear of the espresso machine body.

[0050] Alternatively, the water tank is preferably inserted from the side of the espresso machine body.

[0051] Preferably, the water tank comprises an overflow aperture connected in fluid communication with a drip tray.

[0052] Preferably, the espresso machine comprises a flow measuring device.

[0053] According to an aspect of the present application there is provided an apparatus for providing steam outlet control, the apparatus comprising:

[0054] a body;

[0055] a steam wand assembly connected to the body and having a steam outlet;

[0056] the outlet is controlled by a valve built into the body;

[0057] the valve is controlled by a rotatable control member.

[0058] Preferably, the apparatus further comprises a water pump for drawing fluid from a fluid reservoir and supplying the fluid to a boiler; the boiler provides a solenoid operated valve for steam for starting or stopping the flow of steam from the boiler to the wand assembly.

[0059] According to an aspect of the present application there is provided an espresso machine, comprising:

[0060] a steam wand having a steam outlet;

[0061] The outlet is controlled by a valve incorporated in the espresso coffee maker;

[0062] The valve is controlled by a rotatable vane.

[0063] Preferably, the valve is a ball valve.

[0064] Preferably, the vane is attached to a handle.

[0065] According to an aspect of the present application, there is provided a steam control device for an espresso coffee maker, comprising:

[0066] a ball valve connected in fluid communication with a steam wand;

[0067] a wheel having radially extending lever members; the wheel being rotatably mounted to the espresso coffee maker; the wheel and lever members being operatively connected to the ball valve; and

[0068] wherein the device is configured to pass from a fully closed configuration to a fully open configuration by less than 180 degrees of rotation of the wheel.

[0069] Preferably, the steam control device comprises a switch sensing element for providing a data (or log) signal to a processing module. More preferably, the data signal is indicative of the device being in a fully open configuration in which the outlet of the steam wand is connected in fluid communication with a boiler.

[0070] Preferably, the valve is a ball valve connected in fluid communication with a steam wand assembly; and the rotatable control member comprises a wheel having radially extending lever members; the wheel being rotatably mounted to the body; the wheel and lever members being operatively connected to the ball valve; and wherein the device is configured to pass from a fully closed configuration to a fully open configuration by rotation of the wheel.

[0071] Preferably, the control member is configured to rotate through less than 180 degrees.

[0072] Preferably, the device comprises a switch sensing element for providing a data signal to a processing module. More preferably, the data signal is indicative of the device being in a fully open configuration in which the outlet of the steam wand assembly is connected in fluid communication with a boiler.

[0073] Preferably, the apparatus further comprises a pump for pumping fluid from the fluid reservoir to a boiler; the boiler provides a solenoid operated valve for steam to activate or deactivate the flow of steam from the boiler to the wand assembly. More preferably, the solenoid operated valve is a two position three way solenoid operated valve for activating or deactivating the flow of steam from the boiler to the wand assembly.

[0074] Preferably, the wand assembly is substantially constructed from plastic to isolate heat from the nozzle of the wand.

[0075] Preferably, a temperature sensor element monitors the temperature of the wand nozzle. More preferably, the temperature sensor element is a thermistor. Most preferably, the steam wand assembly has an output steam nozzle connected to a thermistor.

[0076] Preferably, when the solenoid operated valve is closed, a steam passage is a fluid passage open to the atmosphere for limiting the flow of milk being siphoned back into the wand assembly. More preferably, the solenoid operated valve is adapted to supply either pure steam from the boiler or to allow atmospheric flow into the venturi.

[0077] Preferably, the rotatable control member activates one or more switch elements for controlling a steam generating process.

[0078] Preferably, the steam wand assembly is connected to a switch element to enable detection that the steam wand assembly has returned to a predetermined home position.

[0079] Preferably, the apparatus further comprises a pressure sensor element for monitoring the steam pressure at the steam wand.

[0080] It will be appreciated that the apparatus disclosed herein can be a coffee making machine. More particularly, the apparatus disclosed herein can be an espresso coffee making machine.

[0081] It will be further appreciated that the apparatus disclosed herein can be used as a coffee making machine. More particularly, the apparatus disclosed herein can be used as an espresso coffee making machine. BRIEF DESCRIPTION OF DRAWINGS

[0082] Reference will now be made, by way of example, to the accompanying drawings in which:

[0083] Figure 1 is a perspective view of an espresso coffee making machine;

[0084] Figure 2 is a schematic view of an espresso coffee making machine;

[0085] Figure 3A flowchart of a method for controlling an espresso maker;

[0086] Figure 4 for Figure 2 A schematic diagram of the overpressure valve shown.

[0087] Figure 5A The circuit diagram for changing the power supplied to the water pump is shown, along with its use of a silicon controlled rectifier (SCR).

[0088] Figure 5B The circuit diagram for changing the power supplied to the water pump is shown, along with the use of an AC transistor (TRIAC).

[0089] Figure 6A This shows a waveform of the power supply signal.

[0090] Figure 6B yes Figure 6A A modified waveform of the power supply signal shown;

[0091] Figure 6C yes Figure 6A A modified waveform of the power supply signal shown;

[0092] Figure 6D yes Figure 6A A modified waveform of the power supply signal shown;

[0093] Figure 7 This is a schematic diagram of an espresso maker, showing that it has a heated component head;

[0094] Figure 8 This is a schematic diagram of a device that allows water to be injected into the espresso maker of the present invention.

[0095] Figure 9 A schematic diagram of a device that allows water to flow into the espresso maker of the present invention is shown, illustrating an overflow path.

[0096] Figure 10 This is a perspective rear view of the espresso maker of the present invention, showing the opening for housing the water tank;

[0097] Figure 11A This is a three-dimensional rear view of a water tank;

[0098] Figure 11B This is a three-dimensional rear view of the water tank in an unlocked configuration, as shown in Figure 11.

[0099] Figure 12A yes Figure 8 The partial side cross-sectional view of the espresso maker shown depicts the water tank in the engaged position.

[0100] Figure 12B is Figure 8 a partial cross-sectional view of an espresso machine, showing the water tank in an unlocked configuration;

[0101] Figure 13A is Figure 8 a partial cross-sectional view of an espresso machine, showing a lock assembly in an upper locked-in configuration;

[0102] Figure 13B is Figure 8 a partial cross-sectional view of an espresso machine, showing a lock assembly in an unlocked-removed configuration;

[0103] Figure 14A is Figure 8 a partial cross-sectional view of an espresso machine, showing a water flow valve in an open-in configuration;

[0104] Figure 14B is Figure 8 a partial cross-sectional view of an espresso machine, showing a water flow valve in a closed-sealed configuration;

[0105] Figure 15 is a cross-sectional view of a steam wand, valve, and rotatable vane controller;

[0106] Figure 16 is Figure 15 a cross-sectional view in the direction of A-A;

[0107] Figure 17 is Figure 15 a perspective view of a valve, wand, and lever;

[0108] Figure 18 is a schematic diagram of a further embodiment of the technical solution;

[0109] Figure 19 is a schematic diagram of a further embodiment of the steam wand assembly having a wireless communication element;

[0110] Figure 20 is a schematic diagram of a further embodiment of the steam wand assembly employing an air flow attachment;

[0111] Figure 21 is a schematic diagram of a further embodiment of the steam wand assembly employing a ball valve and anti-vacuum valve;

[0112] Figure 22 is a schematic diagram of a further embodiment of the steam wand assembly employing a ceramic valve; and

[0113] Figure 23 is a schematic diagram of a further embodiment of the steam wand assembly employing two independent controllers.

[0114] Preferred embodiments of the invention

[0115] It will be appreciated that espresso coffee machines are widely used to make hot beverages. Espresso coffee is typically brewed by forcing a pressurized water flow through a high density of finely ground coffee. This forces the water flow to disperse through the coffee powder to make the espresso coffee. The quality, flavor and taste of the resulting espresso coffee is influenced by a number of factors, including the texture of the powdered coffee, the density of the coffee pack, the temperature and pressure of the water flow used. By balancing these factors moderately, it is possible to produce a plurality of consistent espresso coffees.

[0116] Pump-based espresso coffee machines rely at least in part on the pressure of the water pump (typically measured in Bar) to make a proper espresso coffee. Referring to Figure 1 Pump-based coffee machines 100 include a water reservoir 110 (typically concealed), a shower or disperser 122, and a filter basket 124 (for holding coffee powder). A steam wand 130 and steam valve 132 can be included for frothing milk. A drip tray 140 is typically used to collect overflow or excess water. A series of user control input units 150 are used to set at least some of the parameters (or factors) associated with making espresso coffee.

[0117] It will be appreciated that some espresso coffee machines have an integrated coffee grinder 160. This can include a hopper 162 for loading coffee beans into the grinder and an outlet 164 for filling the filter basket (when placed below) with coffee powder.

[0118] With the water reservoir filled with water and the filter basket filled with coffee powder, the water is heated and pumped to the shower 122. When the hot water reaches the shower 122, the water flow is forced to disperse through the coffee powder in the filter basket to make the espresso coffee.

[0119] Figure 2 A schematic circuit diagram of an espresso coffee machine 200 is shown. The coffee machine includes a water reservoir 210 with a reed switch reservoir level sensor 212. The outlet passage of the water reservoir includes a flow through filter 214 in communication with two outlet passages 216 and 218.

[0120] In this embodiment, the first outflow path 216 is used to communicate or transport water from the water reservoir 210 to the boiler 250. The outflow path includes a protective filter 220 that communicates water to a water pump 221 that supplies water at a predetermined pressure. A safety pressure relief valve 222 is used to limit the water pressure supplied to the boiler 250. Upon the occurrence of an overpressure in the line, the pressure relief valve 222 supplies or diverts water to the drip tray 240 using line 224. By way of example, the water pump 221 supplies water to the boiler 250 (using line 223) at a pressure of approximately 3 Bar. For a steam system, the water pump recharges the boiler with water at a pressure of approximately 3 Bar. The safety pressure relief valve 222 is set to act at a higher pressure to act as a safety.

[0121] By way of example, the boiler 250 converts water supplied by line 223 into steam. The boiler includes a heating element 252, a water level probe 256, a temperature sensing element (e.g., a thermistor) 257, a thermal cut-out and thermostat 258, and a vacuum vent valve 259. In this embodiment, the boiler is a 0.8 liter boiler. By way of example only, the boiler 250 can be constructed from one or more of a series of materials, including die cast aluminum (preferably with a Teflon lining), stainless steel, or copper. The heating element 252 is preferably a 1000 watt immersion heating element. By way of example only, the heating element can be constructed from one or more of a series of materials, including stainless steel and heat resistant nichrome. It will be appreciated that the heating element can have an alternative wattage rating suitable for generating steam in the boiler. The water level probe 256 preferably uses three probes to monitor the water level and is preferably constructed from stainless steel probes. By way of example only, the thermistor 257 has a maximum temperature rating of approximately 200 degrees Celsius.

[0122] By way of example only, steam 272 from the boiler 250 is released through a continuously variable exhaust ball valve 274 through a steam wand 276. Preferably, the ball valve has a maximum temperature rating of about 150 degrees Celsius, a normal operating pressure of about 2 Bar, and a maximum pressure rating of about 8 Bar. In this embodiment, a second outflow path 218 connects the water tank 210 to the coffee boiler 260. The outflow path includes a protection filter 230, a first flow meter 233, and a water pump 234. The water pump 234 further includes an overpressure (or pressure relief) valve 235. The overpressure valve 235 is used to limit the water pressure supplied to the line 236, typically between 9 Bar and 10 Bar. The overpressure valve 235 is typically set to a pressure set point, typically about 10 Bar, so that when the water pressure exceeds the set point, a portion of the water is returned to the water tank 210 through a return line 237, thereby maintaining the pressure set point. The water returned through the return line 237 can be metered by a second flow meter 238. The main outflow path 236 passes through the heat exchanger 254 to the boiler 250, and then to the coffee boiler 260.

[0123] By way of example only, the coffee boiler 260 includes a heating element 262, a water level probe 266, a thermostatic regulator 267, and a thermal fuse and thermostat 268. In this embodiment, the coffee boiler 260 is a 0.3 liter boiler. By way of example only, the boiler 260 can be constructed from one or more of a series of materials, including die cast aluminum (preferably with a Teflon lining), stainless steel, or copper. By way of example only, the heating element 262 is a 600 watt immersion style stainless steel heating element. The water level probe 266 preferably uses two probes to monitor the water level and is substantially constructed of stainless steel. By way of example only, the thermostatic regulator 267 has a maximum temperature rating of about 150 degrees Celsius.

[0124] By way of example, the coffee boiler outlet is used to provide hot water 282 through a continuously variable output needle valve 284 through a hot water wand 286. In this embodiment, the needle valve 282 preferably has a maximum temperature rating of about 120 degrees Celsius and an operating pressure of about 15 Bar.

[0125] By way of example only, the outlet of the coffee boiler is also used to provide hot water to a coffee spout 292 in order to provide coffee 294. A solenoid 296 releases hot water to the spout 292 for making coffee. The spout 294 further has a pressure gauge 298 for displaying the pressure of the hot water provided by the coffee boiler. By way of example only, the solenoid 296 has a maximum operating pressure of about 16 Bar and a maximum fluid temperature of about 160 degrees Celsius. By way of example only, the solenoid 296 can itself be constructed of one or more of a series of materials including stainless steel and copper. Different protective coatings including nickel plating can be applied to the solenoid.

[0126] It should be appreciated that the fluid lines can be either Teflon or silicone by way of example only.

[0127] It should be appreciated that the water pumps 221 and 234 can be vibratory (reciprocating) pumps, although alternative pump technologies can be employed. Vibratory pumps typically produce an unregulated pressure of 15 to 18 Bar, which is typically too high for the extraction of espresso coffee. In order to regulate the pressure, a fixed or adjustable pressure relief valve can be fitted. Regardless, with the fitting of such a valve, one known way of metering the dose includes having a flow meter placed proximate to the spout. It should be appreciated that any fitting in the fluid proximate to the spout requires a pressure relief valve suitable for operation in a high temperature and high pressure environment. The construction and operation of the pressure relief valve will be discussed in more detail later.

[0128] In this embodiment, the apparatus 200 includes a processor 202 for receiving inputs from a user interface 204, a liquid level probe, a thermistor, a thermal fuse / thermostat. The processor is also for controlling / activating the heating elements and water pumps.

[0129] In this embodiment, a pair of flow meters are employed, a first flow meter 230 for metering the feed flow to the water pump and a second flow meter 237 for metering the return flow from the pressure relief valve 235. In this arrangement, the resulting flow delivered to the coffee boiler 260 (and hence to the spout 296) can be determined by subtracting the return flow from the feed flow. By calculating the resulting flow over a certain period of time during the coffee making process, a dose can be determined. It should be appreciated that the calculation can be real time and the water pump can be stopped when the appropriate dose has been delivered through the spout.

[0130] In this embodiment, a flow measuring apparatus for metering the resulting flow delivered by a water pump in communication with a pressure relief valve has a first flow meter for metering the feed flow to the water pump and a second flow meter for metering the return flow from the pressure relief valve. The resulting flow delivered by the water pump can be determined by subtracting the measured return flow from the measured feed flow.

[0131] Referring now to the drawings Figure 3 A method of flow metering 300 for measuring the flow delivered from a water pump in communication with an overpressure valve, the method comprising monitoring (or metering) the feed flow into the water pump 320 using a first flow meter; monitoring (or metering) the return flow from the overpressure valve 330 using a second flow meter; and calculating the resulting flow, at least in part, by subtracting the measured return flow from the measured feed flow 340.

[0132] It will be appreciated that this calculation can be performed in real time and used to stop the water pump (350) after the appropriate dose has been delivered to the outlet. The pressure, dose, duration can be preset or configured by the user (using the user interface 204 and the control means of the coffee maker).

[0133] A pre-infusion phase is typically initiated to infuse the coffee powder to allow the coffee powder to expand within a filter basket, thereby assisting in capturing fine powder and limiting water from following through the filter. To avoid forcing water through the coffee powder during infusion, the water used in the pre-infusion phase is typically applied at a pressure of 3 Bar. However, it will be appreciated that the pre-infusion phase can range from 1 to 5 Bar.

[0134] In the present embodiment, a low pressure (or reduced pressure) pre-infusion phase can be provided by controlling the water pump 230. This can be achieved by reducing the power supplied to the water pump during this phase. Typically, a power modification module, as described in more detail below, can be used to activate processor control of the power supplied to the water pump. Preferably, during the pre-infusion phase, the power supplied to the water pump activates the water pump to produce a lower than normal pressure. The water flow during the pre-infusion phase will or will not be calculated in relation to the dose subsequently delivered by the outlet.

[0135] Power control can be combined with fluid metering to enable metering of the resulting pre-infusion dose. In one embodiment, the pressure, dose, duration can be preset or configured by the user (using the user interface 204).

[0136] In alternative embodiments, when the system pressure is not metered and the pressure cannot be configured in unitary values, it can be configured in percentage of the maximum water pump pressure. For example, a pressure profile can comprise 30% of the maximum pressure for 5 seconds, then 100% of the pressure for 20 seconds, and finally 70% of the pressure for 5 seconds. Similarly, in another embodiment, the system can use a volumetric output method configured such that 5 ml of volume is delivered at 30% of the maximum pressure, 20 ml of volume is delivered at 100% of the pressure, and 5 ml of volume is delivered at 70% of the pressure.

[0137] It should be appreciated that the power modification module can further activate a pressure profile during a cycle of espresso production. The pressure profile can be pre-set or configured by the user (using the user interface 204 and the controller of the coffee maker). The pressure profile can take the form of a power-time profile that characterizes the power delivered to the water pump.

[0138] It should be appreciated that the illustrated apparatus reveals an espresso maker capable of providing a serving of espresso with a pressure and volume that is adjusted.

[0139] It should be appreciated that the illustrated apparatus further reveals an espresso maker capable of providing a controlled low pressure pre-infusion.

[0140] Overpressure valve

[0141] An overpressure valve (OPV), also known as an expansion valve, can be used in an espresso maker to regulate the pressure of the water flow. The regulated pressure can be fixed or adjusted. For espresso makers, the overpressure valve can be used to reduce the pressure to between 9 and 10 Bar on most vibratory pump based coffee makers.

[0142] Referring to Figure 4 The overpressure valve 400 includes an inlet or bore 410 and an outlet or bore 420. It also includes an overpressure bore 430 for venting water to substantially maintain a pressure set point. A pressure relief seal 432, typically a ball, rubber gasket on a brass piston or other similar shape, is biased by a spring 434 to a closed position relative to the outlet bore 438 (the spring tension or compression 436 can be adjusted). When the pressure exceeds the set point, the pressure relief seal 432 opens to allow water flow to the overpressure bore 430.

[0143] The outlet bore is in communication with the overpressure bore for returning excess water flow to the water tank.

[0144] It should be appreciated that an alternative overpressure valve is used in conjunction with a "T" piece, where the "T" piece defines an inlet bore and an outlet bore. The flow rate is typically determined by the size of the overpressure valve.

[0145] Power modification

[0146] Phase controlled power modification is a method of providing AC power to a load only during a cycle of the AC power source. Figure 6A A sine wave 600 is shown that characterizes an AC power source (voltage or current). Each time the line crosses the neutral or baseline, a "zero crossing" occurs.

[0147] Circuit diagram power modification is provided by Motorola data sheet for MOC30xx variable, which is suitable for inductive and resistive loads.

[0148] Figure 5A A schematic of a circuit 500 for modifying the power provided to a water pump is shown, in which a silicon controlled rectifier (SCR) 530 is employed;

[0149] It should be appreciated that a silicon controlled rectifier (SCR) is generally considered to be an on-off device. Once turned on, it only turns off when there is no current through it. A gate circuit requires a small current to turn the SCR on. The SCR only conducts current in one direction, so if the current reverses, it will turn off because it will no longer allow any current to pass through it.

[0150] Figure 5B A schematic of a circuit 550 for modifying the power provided to a water pump is shown, in which a triac 580 is employed;

[0151] It should be appreciated that the illustrated triac is similar to two SCRs set back-to-back, with only one gate lead coming out of one of the anodes. This allows AC operation, but the triac turns off each time the current reverses (unless the threshold is raised).

[0152] Phase control activates only part of the AC cycle that is coupled to the load 540, which can be performed by a triac or two back-to-back SCRs.

[0153] It should be appreciated that an AC power source has two zero crossings per cycle, during which no current passes through. In North America, the zero crossing frequency is approximately 120 times per second, while in Europe the zero crossing frequency is approximately 100 times per second.

[0154] If the power to be delivered is small, the triac can be turned on for a period of time after each zero crossing, such as at time 612 and time 614, as shown. Figure 6B

[0155] Referring to Figure 6C If only half the power is needed, the triac can be activated at the midpoint of each zero crossing (time 622 and time 624). Referring to Figure 6D , less than half the power can be provided by activating the triac prior to each zero crossing (time 632 and time 634).

[0156] Heating element head

[0157] It should be appreciated that the following would be beneficial for an espresso machine (commercial or consumer / home use):

[0158] Consistently maintaining the precise brew temperature throughout multiple coffee extractions and internal extraction (e.g., pour out)

[0159] ​It allows coffee extraction and milk steaming to occur simultaneously without affecting the execution of each other's steps;

[0160] Ensure that the first coffee extraction prepared by the coffee maker is delivered at the correct extraction temperature after being turned on; and

[0161] It delivers excellent performance and thermal stability with minimal and efficient power consumption.

[0162] Typical household power output (1700-2400W) limits the effective power available to achieve these benefits, especially when a continuous high-volume output is required (multiple cups of coffee, hot water, and steamed milk).

[0163] This situation can be further exacerbated in commercial / home espresso makers that typically employ lightweight (low-calorific-value) brewing units. For example, some espresso makers use stainless steel brewers with relatively low calorific value. Low calorific value generally limits the total flow rate that can be achieved while maintaining ambient temperature and / or atmospheric pressure.

[0164] It should be understood that the combination of the cooker, the brewing cooker, the heat exchanger, and the heating element head helps to reduce the power requirements of the heater connected to the brewing cooker.

[0165] Figure 7 Showing with Figure 2 A schematic diagram of a similar espresso maker embodiment is shown, illustrating a heating element head 700. In this embodiment, a three-stage continuous heating process is employed for water infusion:

[0166] The cold water is preheated by the heat exchanger 254 in the cooking appliance 250;

[0167] Preheated water from the heat exchanger (below the optimal brewing temperature) is then heated to the optimal brewing temperature (e.g., approximately 92 degrees Celsius) in the brewing and cooking appliance 260; and

[0168] Water from the brewing and brewing unit flows through the heating element head 700 (to maintain the optimal brewing temperature) and is poured into the coffee powder.

[0169] The heating assembly head 700 includes a heating element 710 (typically embedded), a thermal break fuse 720, and a thermostat 730.

[0170] Thus, a heating system for an espresso maker comes into play, allowing the three heating elements to operate independently and synchronously. The brewing and brewing units and assembly heads typically employ a proportional-integral-derivative (PID) control module for temperature control.

[0171] In this embodiment, a brewer capacity ratio of 10:3 (steam brewer: infusion brewer) is practical. A heating element power (watts) ratio of 10:6:1 (steam brewer: infusion brewer: heating assembly head) is also practical.

[0172] In one embodiment, the ratio of brewer capacity to heating element power (watts) can be set as follows:

[0173] Brewer capacity to brewer heater wattage is 1000 ml: 1000 W or 1 ml: 1 W.

[0174] Infusion brewer capacity to infusion brewer heater wattage is 300 ml: 600 W or 1 ml: 2 W.

[0175] In an alternative embodiment, a preferred pressure sensor 740 can be included to monitor the water pressure in the fluid line 236. This sensor 740 is connected to an MCU (or processor module) to provide a feedback loop calculation for controlling the selected pressure to be maintained in real time, whereby the power supplied to each water pump is varied according to the pressure developed from the sensor feedback and the subsequent instructions generated from the MCU, controller or processor. In this embodiment, the second flow meter 238 need not be included. It should be appreciated that this variation can be applied to other steam control systems (e.g. espresso preparation 200).

[0176] Water fill assembly

[0177] It should be appreciated that removable water tanks placed behind the coffee maker are often difficult to perform routine refilling operations. In any event, refilling the tank in situ can lead to user error, causing the tank to be overfilled, resulting in potential fill problems for the espresso maker body.

[0178] Referring to Figure 8 In one embodiment of the espresso maker 800, a water fill inlet port 810 is provided on the top or front of the coffee maker for relative ease of operation. The port 810 is covered by a hinged door or other cover. The water fill port 810 is connected in fluid communication with the water tank 820 (typically through an internal horizontal diverter conduit 830 - or hopper). Water 812 can be poured through the port 810, traveling vertically 810, then horizontally through an expanded collection section, and then again vertically 832 into the water storage tank 822 of the water tank 820 disposed near the bottom of the coffee maker.

[0179] Referring to Figure 9To avoid water overflow from the tank and water priming of the espresso machine body, a maximum volume flow channel, cavity or conduit 940 is provided with an overflow passage 942 for directing excess water flow vertically behind the drip tray 950 for water flow collection 952. The flow channel is defined by a partial high wall between the water storage tank 822 and the front end wall of the water tank 820.

[0180] In the current embodiment, by way of example only, the flow channel 940 defines a hole 944 in the water tank at the maximum priming height for receiving the overflow water flow. The flow channel 940 is at least partially integrally formed with the water tank and still directs the overflow water flow within the water tank to the drip tray 950.

[0181] The use of a flow channel in fluid (overflow) communication with a drip tray loaded in the front of the espresso machine body reduces the risk of water seepage into the components of the espresso machine during priming operations while providing visual (and preferably audible) feedback to the user for establishing the integrity of the priming operation. Re-priming of the water tank from the top of the espresso machine is facilitated.

[0182] In one embodiment, an espresso machine comprises:

[0183] A removable water tank;

[0184] A re-priming hole is provided in the front or top of the espresso machine in fluid communication with the water tank;

[0185] A front-loaded drip tray;

[0186] Wherein the water tank comprises an overflow hole in fluid communication with the drip tray.

[0187] Water tank lock assembly

[0188] A water tank that is not secured can move due to vibrations generated by the operation of the coffee machine, causing the water tank to at least partially disengage from the espresso machine.

[0189] The water tank is typically in fluid communication with the boiler of the espresso machine through a pressure relief valve. The pressure relief valve limits fluid flow from the water tank during removal of the water tank (typically during priming and / or cleaning).

[0190] Partial engagement / disengagement between the water tank and the boiler (through a feed valve) can result in leaks, low brew pressure during operation, or limit water flow between the water tank and the boiler.

[0191] In one embodiment, a locking assembly may be introduced to securely engage the water tank with the espresso maker body. The locking assembly can prevent the water tank from unexpectedly detaching from the espresso maker.

[0192] Figure 10 A rearward perspective view of one embodiment of an espresso maker 1000 is shown, illustrating an opening 1010 for accommodating a water tank. A pressure relief valve connection element 1020 is used to receive a pressure relief valve (not shown). A locking abutment surface 1030 is adapted to engage with a locking assembly effectively associated with the water tank.

[0193] In this embodiment, the water tank assembly is fixed in a basically horizontal position on the body of the espresso maker.

[0194] Figure 11A , Figure 11B , Figure 12A as well as Figure 12B An embodiment of a water tank assembly 1100 is shown, comprising:

[0195] One lock component 1110 (in Figure 13A and Figure 13B (For better display), a mechanical eccentric cam lock is used to ensure the water tank is firmly positioned and that the feed valve connection is fully engaged; and

[0196] A pressure relief valve 1120 (in) Figure 14A and Figure 14B (For better illustration), it adopts the form of a spring-biased plunger valve for connection to the water inlet valve connecting element in a horizontal position.

[0197] Figure 11A The water tank 1100, equipped with a locking mechanism, is shown in a locked state. Figure 11B The water tank 1100 with a locking assembly is shown in an unlocked state.

[0198] Figure 12A A partial cross-sectional view of an espresso maker is shown, indicating that the water tank is in a locked position. In this position, the locking assembly 1110 is locked, while the pressure relief valve 1120 is open to allow fluid to flow out of the water tank.

[0199] Figure 12B A partial cross-sectional view of an espresso maker is shown, illustrating the water tank with the pressure plate detached. In this state, the locking assembly 1110 is unlocked, while the pressure relief valve 1120 is closed and sealed to restrict fluid flow out of the water tank. Figure 14B This allows for a better display.

[0200] See Figure 13A andFigure 13B The water tank 1310 is mated with the espresso maker 1320 such that the lock assembly 1330 is proximate to the lock interface 1340. Above the water tank mating, the handle of the lock assembly can be rotated to a locked state (as best shown in Figure 13A Figure 13B During disengagement, refer to

[0201] It should be appreciated that the camming of the lock assembly 1330 into the lock interface 1340 pulls the water tank into the espresso maker body to a mated state, while the off-center camming configuration (where the axis of rotation defined by the pin 1344 is above the interface) limits the lock assembly from being unexpectedly disengaged.

[0202] During disengagement, refer to Figure 14A and Figure 14B The mating of the water tank 1410 with the espresso maker 1420 causes the pressure relief valve assembly 1430 to be mated with the pressure relief valve interface 1440. As the pressure relief valve assembly 1430 is brought into mating with the valve interface 1440, the spring biased pressure relief valve 1434 mates with the interface 1442 and moves the valve to an open mating state so that fluid can flow from the water tank. During disengagement, refer to Figure 14B

[0203] Steam Control

[0204] Figures 15 to 17 An embodiment of a steam control apparatus for an espresso maker is shown by way of example only.

[0205] As Figure 15 ​​As shown, an espresso machine includes a steam wand 1500 that is pivoted about a ball joint 1501. Steam is delivered to the wand 1500 through an output port 1502 of a valve 1503. In contrast to using a multi-turn needle valve, in some embodiments, a continuously variable output ball valve 1504 is used to regulate (continuously from no steam to full steam) the total amount of steam delivered to the wand 1500. The ball valve 1504 can be mechanically operated and mechanically linked to a rotary knob 1505 for more autonomous user control. Since a ball valve preferably only needs to be rotated about 90 degrees (or at least less than 180 degrees) to go from fully closed to fully open, the user operating knob 1505 preferably only needs to be moved through 90 degrees or less to produce full control of the output of the wand 1500. Up to 180 degrees is acceptable. In this embodiment, a feed port 1506 receives steam from a boiler (e.g., such as the boiler 260 shown in Figure 2 and Figure 7 The ball valve 1504 is disposed in an outer housing 1507 of the espresso machine.

[0206] Referring to Figure 15 , Figure 16 and Figure 17 , it will be appreciated that the rotary knob 1505 is formed from a lever axle 1508 that carries a radially extending lever or lever 1601. The lever 1601 is convenient for the user to grasp and provides a way for the user to apply more torque (precisely) to the valve 1503. The axle carries an outer cover 1509 that is shaped to have a channel 1701 formed therein through which the lever 1601 extends. The axle 1508 also has a longitudinally extending shaped hollow shaft 1510 that is inserted through by a fastener 1511 that links the shaft 1510 to the rotatable component of the valve 1504, e.g., a ball valve.

[0207] As Figure 15 and Figure 16As shown, the interior (or inner surface) of the axle 1508 is contoured or loaded with a cam surface 1602. The cam surface 1602 cooperates with a micro switch 1603 that can be placed inside a mounting bracket or housing 1604. The cam surface 1602 is adapted to carry the micro switch 1603, so that when the lever 2601 is rotated to a position that allows the valve to deliver steam through the wand 1500, the micro switch 1603 is triggered. The micro switch 1603 can thus transmit a data (or log) signal to the MCU of the espresso machine, which can apply it to a variety of purposes. In one embodiment, when the micro switch 1603 is triggered, the MCU recognizes the output of the micro switch as representing the output of the steam wand in fluid communication with a boiler. This is an undesirable condition, and the MCU will block both the boiler from heating and the output to the steam wand until the condition is corrected by the user. In a preferred embodiment, the cam surface 1602 and the micro switch 1605 are both housed in the housing 1507.

[0208] In one embodiment, a steam control apparatus for an espresso machine includes:

[0209] a ball valve in fluid communication with a steam wand;

[0210] an axle having a radially extending lever member; the axle is rotatably mounted on the espresso machine; the axle and the lever member are operatively connected to the ball valve, which is operable in a variable state;

[0211] wherein the apparatus is configured to reach a fully open state from a fully closed state by less than 180 degrees of rotation of the axle.

[0212] In general, the steam control apparatus includes a switch sensing element for providing a data (or log) signal to a computing module. The data signal can represent that the apparatus is in a fully open state, in which the outlet of the steam wand is in fluid communication with a boiler.

[0213] Further embodiments of the present application are described by principles Figure 18A coffee maker 1800 is shown. The coffee maker 1800 includes a water pump 1801 that pumps water from a water tank 1802 and supplies the water to a boiler 1803. Steam from the boiler 1804 is supplied to a solenoid operated valve 1805. The two position, three way solenoid operated valve 1805 is used to start or stop the flow of steam from the boiler 1803 to a wand 1811. In the preferred embodiment, most of the wand assembly is constructed of plastic to isolate the wand 1811 from the general heat of the nozzle 1812. The temperature of the nozzle is monitored by a thermistor 1813, which typically represents the temperature of the liquid or milk surrounding the nozzle 1812. When the solenoid 1805 is off, the steam flow path has an open fluid path to the atmosphere. Exposing the steam flow to the atmosphere prevents milk from being siphoned into the wand 1811 and a venturi 1806. Once milk enters these areas, contamination, odor and clogging can result. The valve 1805 is adapted to supply pure steam from the boiler 1803 and to allow atmospheric air to enter the venturi. The venturi 1806 is also supplied with air, preferably compressed air 1808 supplied by an air pump 1808. The air supplied by the air pump 1808 passes through a check valve 1809. Clogging of the steam wand 1811 can create a back pressure inside the steam flow path that can potentially damage the air pump 1808. The check valve 1809 prevents the back pressure event from affecting the air pump 1808 in reverse. The output 1810 of the venturi is supplied to a steam wand 1811. The steam wand 1811 has an output steam nozzle 1812 attached to or adjacent to the steam wand 1811 or connected to the steam wand 1811 by a thermistor such as an NTC thermistor 1813. A rotatable steam lever 1814 activates switches such as micro switches 1815, 1816. One of the micro switches 1815 regulates the automatic frothing program. The other micro switch 1816 is used to control the manual frothing operation. The status of the switches 1815, 1816 is monitored by a micro processing control unit (MCU) 1817. The MCU also reads the output of the thermistor 1813 for control of the air pump 1808 and the solenoid operated valve 1805. The MCU also detects the signal of a third micro switch 1818, which is connected to the position of the steam wand 1811. More specifically, the micro switch adjacent to the steam wand 1818 detects when the steam wand 1811 is returned to the upper right or home position, which is the appropriate position for cleaning the steam wand, particularly the automatic cleaning program to be disclosed later.

[0214] For the automatic steam operation, the user activates the lever 1814 to contact the first micro switch. In the preferred embodiment, the steam wand 1814 is biased against a spring or other resilient biasing member 1819 so that the lever returns to its original, neutral position once released. The signal (or lack thereof) from the micro switch 1815, detected by the microprocessor 1817, causes the solenoid operated valve 1805 to open to allow steam to flow from the boiler 1804 to the venturi 1806. In the venturi, the steam from the boiler mixes with air 1807 from the pump 1808. The steam-air mixture travels through the steam wand 1811 and out the nozzle 1812 and directly into the container 1820, which preferably contains milk. The temperature sensor 1813 detects the temperature and transmits the relevant signal to the MCU 1817, which in turn causes the milk temperature 1821 to be displayed. Preferably, the display 1821 is located on the front panel of an espresso machine or a stand-alone milk frothing device. The milk temperature can be pre-set by the user using a separate control key located in a user interface. When the milk in the container 1820 reaches a pre-set temperature, both the solenoid 1805 and the air pump 1808 are turned off or deactivated. Once the solenoid 1805 is turned off, the steam path to the steam wand is open to the atmosphere 1805.

[0215] The air pump can be independently activated, for example, it can be activated or deactivated according to a pre-set temperature, time and / or combination logic.

[0216] In the manual steam operation, the user activates the steam lever 1814 by facing the orientation of the second micro switch 1816. This causes the solenoid 1805 to open and allow steam to flow from the boiler 1804 to the venturi. In this mode, the steam passes directly through the venturi and air 1805 is not introduced into the steam path. The steam travels through the steam wand 1811 and out the nozzle 1812 and directly into the container 1820. The temperature sensor 1813 detects the temperature of the milk in the container 1820 and then transmits the appropriate signal to the microprocessor 1817. The microprocessor drives the display 1821 on the body to display the milk temperature. When sufficient milk has been dispensed, the user deactivates the steam lever 1819 by returning it to its original, neutral position. When deactivated in this manner, the solenoid 1805 is open to the atmosphere. By opening the steam path to atmospheric pressure, condensation of the hot steam in the steam path does not cause the milk in the container 1820 to be drawn back into the nozzle 1812.

[0217] In an alternative semi-automatic program, the user can select (factory pre-set or custom) a temperature, for example, when the user is frothing milk, a sensor recognizes and / or calculates the degree of closeness to the user selected temperature and provides feedback to the user to turn off the steam delivery by sound and / or visual display.

[0218] In a preferred embodiment, after the automatic vaporization function has been completed and the container has been removed, the rod position microswitch 1818 will determine when the rod returns to its home position or the safe downward position. A signal from the microprocessor 1818 will be detected by the MCU 1817, causing the solenoid 1805 to briefly (e.g., about 1 second) or a series of brief openings to clean the nozzle 1812 opening. This can be an automated procedure for cleaning foam residue lines. In some embodiments, an audible or visual alarm may precede this automated procedure to alert the user that steam will be ejected from the nozzle 1812. The state of the rod orientation sensor switch or microswitch 1818 when the steam rod is in its home or fully downward position allows other automated procedures to be executed. The airflow rate and volume from the air pump 1808 can be controlled, for example, using pulse width modulation. The airflow rate can be controlled via communication through the user interface 1822. The output control of the air pump 1808 has the effect of determining the quality of the frothed milk introduced into the container 1820. A high flow rate produces more texture or air foam, while a low flow rate results in denser, less foam.

[0219] In one embodiment, pressure sensor 1830 can be used to activate processor MCU 1817 to monitor the steam pressure at steam rod 1811. In this embodiment, the pressure sensor is connected between venturi tube 1806 and the steam passage of steam rod 1811. It should be understood that this activates: the detection of a partially or completely locked steam rod (typically due to residue buildup at the steam rod outlet), thereby enabling the MCU to terminate the steam program and / or alert the user to related issues; and providing real-time / feedback of combined steam / air pressures to allow the MCU to control the air pump flow rate to achieve preset pressure parameters.

[0220] like Figure 19 As shown, the temperature of the liquid being boiled inside the kettle 1900 can be wirelessly communicated with the control PCB 1901. In this embodiment, the kettle 1900 includes a thermostat such as an NTC thermostat and a transponder 1902 such as an RFID, WiFi, Bluetooth, or infrared transponder. The transponder 1902 transmits a wireless signal (or other radio frequency), which is received by a matching receiver chip or base station 1903. The receiver or base station 1903 supplies appropriate signals to the input circuitry of the PCB 1901. As described in the foregoing embodiments, Figure 19The cooking apparatus shown includes a cooker 1904 that supplies steam to a 3 / 2 solenoid 1905. The solenoid controls the steam flow into the venturi 1908 while simultaneously allowing overflow or overpressure to be released to the atmosphere 1906, particularly into a drip tray 1907 located below the kettle 1900. As in other embodiments, the venturi receives air or compressed air from an air pump 1909. A protective check valve 1910 is inserted between the air pump and the venturi inlet 1911.

[0221] like Figure 19 As shown, the steam rod is connected to a steam rod position sensor 1912. The position sensor 1912 provides a signal to the control PCB 1901. During manual cooking operations, the control PCB 1901 allows steam to be discharged through the solenoid 1905 regardless of the rod's position. However, during automatic cooking operations (where the user does not directly control the steam output using buttons and handles) or during automatic steam rod cleaning, the PCB 1901 only allows the solenoid 1905 to operate when the steam rod is in a designated ("down") position, depending on the position sensor 1912.

[0222] like Figure 20 As shown, some embodiments of the present invention require joint or synchronous control of the main steam solenoid 2000 and the air pump 2001, or the solenoid 2000 to be subordinate to the air pump 2001 for control. The start-up of the air pump can be delayed compared to the start-up of the steam flow. To achieve this, a separate output from the control PCB 2003 is used to control the switching operation of both the solenoid 2000 and the air pump 2001.

[0223] like Figure 21 As shown, a manually operated valve, such as ball valve 2100, provides the user with output control of the brewer 2101. Steam flowing through ball valve 2100 is directed to the venturi tube 2102. An anti-siphon or anti-vacuum valve 2103 is positioned between ball valve 2100 and venturi tube 2102. Anti-vacuum valve 2103 prevents vacuum pressure on the venturi tube from allowing fluid to enter the ball valve, brewer, or other coffee maker components located upstream of valve 2103. Ball valve 2100 is connected to sensor 2104. The sensor transmits the operating position of the ball valve to the control PCB 2105. Given that the ball valve position information has been obtained from sensor 2104, the control PCB can illuminate a warning light 2106 located on the outer surface of the steam or espresso maker to indicate, for example, that the steam passage toward the wick is open. In some embodiments, when sensor 2104 indicates that the ball valve is open, control PCB 210 allows power to be transmitted to the brewer 2101. This prevents accidental operation of the brewer when the coffee maker is first turned on and when the ball valve 2100 is already open.

[0224] As Figure 22 shown, a multi-port valve 2200 can be used in place of the globe valve 2100 shown. The multi-port valve provides additional flexibility by allowing a separate rotatable valve stem, which is connected to the multi-port valve 2200, to control multiple different fluid passages. Thus, the multi-port valve 2200 can include a spillway drain port 2201 leading to a spillway passage 2202 which drains to ambient air 2203, and more particularly, to a drip tray 2204 which lies on the bottom of the kettle 1900. The rotatable multi-port valve 2200 can also include a manual bypass passage 2205 to allow steam from the kettle 2101 to bypass to the Figure 21

[0225] As Figure 23 shown, two separate control PCBs 2300, 2301 are used to control the main steam solenoid 2302 and the air pump 2303 which delivers air to the venturi 2304. In one embodiment, a pressure detection sensor or switch 2305 detects the pressure in the line 2306 between the solenoid 2302 and the venturi 2304. When the pressure sensor or switch detects a pressure condition, it sends a signal to the input port of the second PCB 2301. The second PCB 2301 interprets the signal as a command to supply power to the air pump 2303. In other embodiments, the pressure switch 2305 is not necessary. Instead, a user operated control 2310 provides a signal or switch condition which is interpreted by the second control PCB 2301 as a command to supply power to the air pump 2303. If desired, the user operated switch 2310 can be disabled in other ways when the main solenoid 2302 is closed.

[0226] Description

[0227] It should be appreciated that some embodiments described herein as a method or combination of elements of a method can be implemented by a processor of a computer system or by other means of carrying out the function during the execution of instructions by a processor. Thus, a processor with the necessary instructions for carrying out such a method or element of a method forms a means for carrying out the method or element of a method. Furthermore, any of the embodiments described herein that are described as comprising a means for performing a particular function can be implemented by a processor of a computer system or by other means of carrying out the function during the execution of instructions by a processor. Thus, a processor with the necessary instructions for performing such a function forms a means for performing the function.

[0228] ​In alternative embodiments, one or more processors operate to perform novel actions described herein in a server-centric network environment, in a peer-to-peer network environment, or in a point-to-point network environment.

[0229] Unless specifically stated otherwise as apparent from the above disclosure, it is appreciated that throughout this specification discussions utilizing terms such as "processing," "computing," "calculating," "determining" or the like can refer to action and / or processes of a computer or computing system, or similar electronic computing device, that manipulate and / or transform data represented as physical, such as electronic, quantities within the computer's or computing system's registers and / or memories into other data similarly represented as physical quantities within the computer's or computing system's memories, registers or other such information storage, transmission or display devices.

[0230] In the same manner, the term "processor" can refer to any device or portion of a device that processes electronic data, now or in the future, to transform that electronic data into other electronic data that can or can not be stored or sent. A "computer" or a "computer device" or a "computing platform" can include one or more processors.

[0231] The methods described herein, in one embodiment, can be performed by one or more processors that accept computer-readable (or machine-readable) instructions coded in the form of a series of instructions to be executed by, or to control the operation of, the one or more processors. Any processor capable of executing a series of instructions can be included.

[0232] Unless specifically stated otherwise, throughout this specification the term "comprising" or variations such as "comprise" or "comprises" is not intended to exclude the presence of non-recited features, articles, components, elements or steps. Thus, for example, a process, method, article, or apparatus that "comprises" one or more features, does not comprise an exclusive set of the features.

[0233] Similarly, it is to be emphasized that the term "connected" when used in the claims is not intended to be limited to direct connections only. The term "connected" and "coupled" are used in the claims are used broadly and encompass both direct and indirect connections, as well as any other manner of association or linkage between the things so connected or coupled. It should be appreciated that the use of the term "connected" or "coupled" or similar terms does not require direct physical or electronic connectivity, but can also include indirect coupling through one or more other devices or structures. Thus, unless specifically stated otherwise, the term "connected" is intended to be interpreted in the broadest possible sense.

[0234] Unless otherwise stated, the use of ordinal modifiers such as “first,” “second,” “third,” etc., to describe the same object is merely to indicate different instances of the same object and is not intended to imply that the objects being described must be in the given order, whether in time, space, hierarchy, or otherwise.

[0235] Throughout this specification, the phrase "an embodiment" or "one embodiment" indicates that a detailed feature, structure, or characteristic associated with that embodiment is included in at least one embodiment. Therefore, the phrase "in one embodiment" or "in this embodiment" does not necessarily refer to the same embodiment in all instances throughout this specification, but may refer to the same embodiment. Furthermore, the detailed features, structures, or characteristics described can be combined in any suitable manner by those skilled in the art based on the disclosure of one or more embodiments.

[0236] Similarly, it should be understood that in the foregoing description of typical embodiments of the invention, multiple features of the invention may sometimes be combined to form a single embodiment, drawing, or description for the purpose of clarifying or aiding in the understanding of one or more aspects of the rich inventiveness. This disclosure, in any case, should not be construed as reflecting an intention that the claimed invention requires more features than those expressed in the claims. Admittedly, as reflected in the claims, the inventive aspects are fewer than all the features of the single embodiment disclosed above. Therefore, the claims appended to the detailed description are incorporated in this manner, that is, each claim is independently presented as a separate embodiment of the invention.

[0237] Furthermore, some embodiments described herein include some, but not others, features included in other embodiments. Combinations of features from different embodiments are indicated to be within the scope of the invention and constitute different embodiments, as will be understood by those skilled in the art. For example, in the claims, any claimed embodiment can be used in any combination.

[0238] As described herein, most specific details are explained in detail. However, it should be understood that embodiments of the invention can be practiced even without these specific details. In other instances, well-known methods, structures, and techniques have not been shown in detail to avoid obscuring the understanding of this specification. Although the invention has been described with reference to specific examples, those skilled in the art will recognize that the invention can be embodied in many other ways.

Claims

1. A coffee maker apparatus having a boiler, a controller, and a steam wand rotatable between an automatic vaporization function position and a home position, comprising: a solenoid operated valve between the boiler and the steam wand outlet and having an open fluid path to ambient air, the solenoid operated valve operated by the controller; and a switch located in the vicinity of the steam wand, the switch providing a home position signal to the controller when the steam wand is rotated to the home position, the controller configured to cause a series of steam bursts to clean out froth residue in response to the home position signal.

2. The coffee maker apparatus of claim 1 wherein, the controller causes the series of steam bursts after a steam generation function, the steam generation function is automatic.

3. The coffee maker apparatus of claim 1 wherein, the controller, prior to causing the series of steam bursts, generates a visual or audible warning through a user interface.

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