AU722837B2 - Bread making machine and method with automated dispenser and pause function - Google Patents

Description

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5i Regulation 3.2

AUSTRALIA

Patents Act 1952 COMPLETE SPECIFICATION FOR A STANDARD PATENT

(ORIGINAL)

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Name of Applicant: Actual Inventor(s): Address for Service: Invention Title: SALTON-MAXIM HOUSEWARES, INC.

SIT, Michael DREIMANN, Leonard WESTFIELD, Barbara A.

DAVIES COLLISON CAVE, Patent Attorneys, 1 Little Collins Street, Melbourne, 3000.

BREAD MAKING MACHINE AND METHOD WITH AUTOMATED DISPENSER AND PAUSE FUNCTION The following statement is a full description of this invention, including the best method of performing it known to me/us: -1-

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Descript~ion BREAD MAKING MACHINE AND METHOD WITH AUTOMATED DISPENSER AND PAUSE FUNCTION Technical Background This invention relates generally to electrical appliances used in food preparation, and more particularly, to automatic bread making appliances.

Backg~rund of the Invention recent years, automatic bread making machines have become increasingly prominent in the marketplace. These machines make bread without requiring a user to expend the time and effort associated with mixing, repeated kneading, and baking. Bread making machines allow the user to pour the bread making ingredients into the machine, to press a few selected control buttons, and to leave the machine to do the work.

Developments in bread making machine technology have increasingly automated the entire bread making process, thereby requiring less and less user intervention. However, certain types of breads require different sets of ingredients to be combined at different times. Today's bread making machines provide for this by issuing audible signals indicating to the user that a next set of ingredients must be added to the bread making machine. At best, this is inconvenient. At worst, the bread may be ruined if the user does not add the ingredients at the proper time.

A related problem is that once a bread making cycle has begun, currently available bread making machines cannot be stopped without then being restarted at the beginning of the cycle. Therefore, it can be difficult to add previously forgotten ingredients. Also, a user cannot choose to extend the bread dough rising time beyond that of the preprogrammned bread making cycle.

P:\OPER\DH\2193182.DIV 7/7/99 -2- It can be appreciated that there is a need for improved automation of bread making machines. It can also be appreciated that there is a need to allow user intervention in the bread making cycle, without then requiring the bread making machine to be restarted at the beginning of the cycle.

Summary of the Invention The invention seeks to address at least one of the above needs.

In accordance with the invention, there is provided an automatic bread making machine, comprising: a chamber to receive bread making ingredients; a motor to permit mixing of the ingredients within the chamber; a heater for baking the S"ingredients within the chamber; *g *o S "a controller to control the operation of the motor and the heater; and 15 a user interface to receive bread making instructions from a user and for displaying bread making status information to the user, the user interface operable to receive a pause instruction at any time in the bread making, the controller responding to the pause instruction to suspend °execution of the bread making for a selected time interval and to resume execution of the bread a making after the selected time interval has elapsed.

In another aspect, there is provided a method of baking bread in an automatic bread making machine having control circuitry operable to respond to bread making instructions from a user, comprising: receiving bread making ingredients; in response to a start instruction, beginning execution of a bread making sequence; in response to a pause instruction, suspending execution of the bread making sequence at any point in the bread making sequence for a selected time interval; and after the selected time interval has elapsed, resuming execution of the bread making sequence.

P:\OPER\DH\2193182.DIV 7/7/99 -3- One advantage of the pause feature is that the bread making process can be stopped temporarily, to add ingredients or for observation, without having to restart the entire bread making cycle over again.

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Brief Description of the Figures Figure 1 depicts a bread making machine according to the present invention.

Figure 2 is a functional block diagram depicting the electronic control and other circuitry contained within the bread making machine of Figure 1.

Figure 3 is an exploded view of an automated dispenser unit and a chamber lid according to the present invention.

Figure 4 is an underside view of the automated dispenser integrated within the chamber lid.

Figure 5 is a cross-sectional view of the automated dispenser.

Figure 6 is a software flowchart diagram depicting the electronic control circuitry operation of the automated dispenser unit Figure 7 is a software flowchart diagram depicting the electronic control circuitry operation of a pause funaction of the bread making machine of Figure 1.

Detailed Descriotion of the Invention Figure 1 shows a bread making machine 10 in accordance with the present invention. The bread making machine 10 includes a chamluer lid 12 which covers a bread making chamber in which the various bread making ingredients are mixed and baked. The lid 12 is pivotally mounted at hinge 14 and includes a handle 15 to provide user access to the bread making chamber within the bread making machine 10. The bread making machine 10 includes a user interface panel, such as control panel 16. The control panel 16 includes a display unit 18 for displaying bread making selections made by the user, as well as displaying the status of bread making operations. The control panel 16 also includes a keyboard 20 with which the user is able to select certain bread making V instructions. The lid 12 also includes a window 22 through which a user can observe the bread making procedure.

Integrated within the lid 12 is an automated dispenser unit 24. The dispenser unit 24 includes a pivotally mounted dispenser lid 26. An aperture within the lid 12 conveniently allows a user to lift open the dispenser lid 26, thereby providing access to the interior of dispenser unit 24, described in detail below. The dispenser unit 24 receives a set of bread making ingredients, such as nuts and/or fruit, which is added to the bread making chamber only after significant processing of other bread making ingredients contained within the bread making chamber.

Figure 2 is a functional block diagram which depicts the basic electronic circuit components contained within the bread making machine 10 of Figure 1. Electronic control circuitry includes a microcomputer 32 which controls the functioning of an electric motor 34, a solenoid coil 36, and a heat unit 38 via respective electronic drive circuits 34A-38A. The microcomputer 32 is powered by a power supply circuit 40, which also powers the motor drive circuit 34A, coil drive circuit 36A, and heat drive circuit 38A. The power supply circuit 40 is preferably connected to an exteral AC electrical source 42, such as a 120 V, 50-60 Hz source. The power supply 40 provides both DC power to the microcomputer 32 and AC power to the driver circuits 34A-38A. The AC power output of the power supply circuit 40 is monitored by a zero crossing detector 44 coupled with the microcomputer 32, thereby allowing the microcomputer to adjust the speed of the motor 34 in a well-known manner.

The microcomputer 32 includes software instruction processing means, such as a microprocessor, for executing a series of preprogrammed bread making instructions which are stored in a data/instruction storage means, such as a computer register or memory. Before beginning execution of the bread making instructions, the microcomputer 32 is placed in an initialized state by a reset circuit 45 in conventional fashion. The microcomputer 32 receives a clock signal input from a clock circuit 46, receives user instructions from the keyboard (see Figure 1) via a keyboard circuit 48, and displays bread making status information on the display unit 18 (see Figure 1) via a display circuit 50. The microcomputer 32 also receives one or more signals from a temperature sample circuit 52 and adjusts the operation of the heat unit 38 accordingly. The microcomputer 32 can communicate status information audibly, such as an endof-cycle tone, via a buzz circuit 53.

Each of the circuits whose function and interconnection is described in connection with Figure 2 is of a type known in the art, and one skilled in the art would be able to use such circuits in the described combination to practice the present invention. The internal details of these particular circuits are not part of, nor critical to, the invention. Therefore, a detailed description of the internal circuit operation is not required. Instead, those skilled in the art will appreciate that significant advantages are achieved by, for example, providing the solenoid coil 36 and drive circuitry 36a under control of the microcomputer 32, together with associated software instruction execution by the microcomputer.

Figure 3 is an exploded view drawing showing the dispenser unit 24 positioned between an outer lid portion 54 and an inner lid portion 56 of the chamber lid 12. The dispenser lid 26 is shown in an open position and reveals an upper opening 58 of a dispenser case 60. The dispenser 24 also includes a dispenser door 62, shown in the open position. The dispenser door 62 is pivotally mounted to the dispenser case 60 by hinge pins 61 held by retainer clips 67. The dispenser door 62, when closed, covers a lower opening 63 in the dispenser case 60. When the dispenser door is in the closed position, a latch hook 64 engages a door latch assembly 65 (see Figures 4 and a portion of which protrudes from a latch assembly housing 66 of the dispenser unit 24. As *will be described in detail below, the door latch assembly is actuated by a wedge 68, which is linked to, and mechanically actuated by, a push rod 69.

Figure 4 shows an underside view of the dispenser unit 24 integrated within the chamber lid 12, and also shows an underside view of the control panel 16. A portion of the inner lid 56 and the latch assembly housing 66 has been omitted to provide a view of the latch assembly 65 and its interaction with the wedge 68. The latch assembly 65 includes a latch slide and a latch spring 72. As also seen in the cross-sectional view shown in Figure 5, the latch spring 72 biases the latch slide 70 into engagement with the latch hook 64 to maintain the dispenser door 62 in a closed position over the lower opening 63 of the dispenser case 60. The latch slide 70 has a tapered groove 74 which receives the wedge 68.

Referring to Figure 4, a printed circuit board (PCB) shield supports the microcomputer 32 and other electronic control circuitry (see Figure 2) within the control panel 16. Adjacent to the PCB shield 75 is a solenoid 76, including the solenoid coil 36 and a movable core or plunger SO. A plunger spring 82 biases the plunger 80 in a direction away from the push rod 69. Upon electrically energizing the solenoid coil 36, the plunger 80 is moved in a direction opposite to the bias of the plunger spring 82, and a first plunger head 84 on the plunger pushingly engages a second plunger head 86 attached to the other end of the push rod 69. The first and second plunger heads 84, 86 are not physically connected, thereby allowing pivotal rotation of the chamber lid 12 relative to the control panel 16 (see Figure Energizing the solenoid coil 36 causes the push rod 69 to move the wedge 68 fur-ther within the tapered groove of the latch slide 70, which in turn causes the latch slide 70 to move in a direction opposite the bias of the latch spring 72, thereby releasing the latch hook 64 of the dispenser door 62 (see Figure The dispenser door 62 then swings open and any bread making ingredients contained within the dispenser case 60 are emptied into the bread making chamber.

The automated dispenser unit 24 of the bread making machine according to the present invention affords numerous advantages over prior art bread making machines. Previously, any breads containing, for example, fruit and/or nuts required the bread making machine to issue an audible signal indicating to the user the appropriate time at which to add the fruit and/or nuts during a bread dough kneading cycle. Thus, the present invention provides superior automated bread making by allowing the user to insert ingredients, such as fruit and/or nuts, into the automated dispenser unit 24 at any convenient time prior to the appropriate time during the kneading cycle. The ingredients are then automatically added to the contents of the bread making chamber under control of the microcomputer 32 of Figure 2, and no further user intervention is required.

Referring again to Figure 2, the microcomputer 32 executes a series of preprogrammed bread making instructions and correspondingly controls the operation of units such as the motor 34, solenoid coil 36, heat unit 38, 8 display unit 18 (see Figure etc. One set of such bread making instructions includes operation of the automated dispenser unit 24, and is depicted in Figure 6. A user may select any of a variety of bread making cycles by using the keyboard 20 (see Figure The key circuit 48 communicates the selection to the microcomputer 32 where the selection is registered therein in step 90. In step 92, the microcomputer 32 then- inquires whether a start key has been actuated by the user. In the preferred embodiment of the present invention, a multifimction key for both start and pause fuinctions is employed. The pause fimction is described below in connection with Figure 7.

If the start key is actuated, the bread making operation commences step 94. In a conditional branch step 96, the microcomputer 32 determines whether one of a plurality of bread types has been selected which may require use of the dispenser unit 24. If not~ the selected bread making operation continues with steps 98 and 100 until the end of the bread making operation at step 102. If a selected bread type may require use of the dispenser unit 24, the microcomputer 32 proceeds to a conditional branch step 104, in which it is determined whether the automated function of the dispenser unit 24 has been expressly selected/deselected. In the preferred embodiment of the present invention, selection of a bread type which may require use of the dispenser unit .20 24 results in a default selection of the dispenser unit function. The user may then deselect the automated function of the dispenser unit 24, or toggle between selected and deselected states, by actuating a dispenser select key included in the keyboard 20 (see Figure Since the selectionldeselection can be made at any time prior to a dispensing time during the kneading cycle, the test of step 104 is repeated until that dispensing time. If the automated function of the dispensing unit 24 has not been selected, the conditional test of step 106 returns to step 104 until the dispensing time has passed. I the event the automated function of the dispenser unit 24 has been selected, a conditional test of step 108 also returns to step 104 since the automated function of the dispenser unit may be deselected at 9 any time prior to the dispensing time. If the automated function of the dispenser unit 24 has been selected, the microcomputer 32, in step 109, causes the coil drive circuitry 36A to energize the solenoid coil 36 (see Figures 2 and 4), thereby emptying the contents of the dispensr unit 24 into the bread making chamber. The bread making operation then continues with steps 98-102 as described above.

The bread making machine 10 according to the present invention also incorporates a novel pause function, allowing a user to temporarily suspend the bread making operation at any time, and to resume the breil making operation at a later selected time. Prior art bread making machines do not incorporate such a feature, and do not allow temporary interruption of bread making operations to, for example, add previously forgotten ingredients. Once bread making operations have begun in prior art bread making machines, they must continue to the end or be started again from the beginning. It will be appreciated that the pause function provided by the present invention affords significant advantages over the prior art.

Figure 7 depicts a sequence of operations performed by the microcomputer 32 of Figure 2 to provide the pause function. A conditional branch test of whether the user has actuated a pause key of the keyboard 20 (see Figure 1) is performed in step 110. If not the bread making operation is allowed to continue in step I111. If the user has actuated the pause function, preferably for a minimum time interval such as 0.5 seconds, the operation of the microcomputer 32 is paused in step 112. The program state of the microprocessor within the microcomputer 32 is saved, for example, by saving the values of instruction pointer and flag registers within the microcomputer. A pause subroutine. 114 is then executed by the microcomputer 32, in which the timing of bread making operations is suspended, the motor 34 and/or heater 38 is stopped, and the display unit 18 conveys the paused state of the bread making machine to the user. A program loop comprising steps 116 and 118 then determines whether a predetermined time delay has occurred or the pause key has again been actuated by the user, respectively. If either of these events occurs, the bread making program state of microcomputer 32 is restored at step 120 and the bread making operation resumes in step I111.

It will be appreciated tat although an embodiment of the invention has .been described above for purposes of illustration, various modifications may be made without deviating from the spirit and scope of the invention. Those skilled in the art will appreciate that a number of different automated dispenser mechanisms could be employed according to the present invention. For example, a dispenser unit with discrete compartmnents for 9@ different sets of ingredients to be added to the bread making chamber at different times is well within the contemplation of the present invention. Also, the dispenser unit may have a different mechanical structure from that described above, while still providing the function of the present invention namely, automatically dispensing certain bread making ingredients into the bread making chamber only after significant processing of other ingredients in the bread making chamber has occurred. For example, a rotating dispenser unit could be employed. Such a unit would include a compartment with an opening facing away from the bread making chamber prior to the dispensing time, and then rotating the compartment into a position where the opening faces toward the bread making chamber at the dispensing time. Indeed, numerous variations are well within the scope of this invention.

It will also be appreciated that the automated dispenser of the present invention can be included in any of numerous electrical kitchen appliances which mix together various ingredients at different times. Some examples include pasta makers, ice cream makers, yogurt makers, electronic stand mixers, food processors, bagel makers, and dough makers.

Similarly, the pause function of the present invention can be incorporated into any of a wide variety of electrical kitchen appliances, including 11 those examples identified above. As another example, a bread toaster having the pause function would allow a user to check the progress of the bread toasting without effecting the total time for which the bread is toasted. Indeed, the pause function may be advantageously employed any time a user wishes to check the status of kitchen appliance operations without interfering with the overall timing and sequence of those operations.

It will be appreciated that, although Figures 6 and 7 depict a continuous computer program execution, an interrupt driven protocol may be advantageously employed. In particular, the pause function execution depicted in Figure 7 may be provided by performing a first interrupt service request (ISR) routine upon receipt of the first actuation of the pause key, and executing a second ISR routine upon receipt of the second actuation of the pause key or expiration of a timer. As with the automated dispenser unit, the pause function according to the present invention may be achieved by numerous variations 15 within the scope of this invention. Accordingly, the invention is not limited except as by the appended claims.

Throughout this specification and claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" or "comprising", will oe: be understood to imply the inclusion of a stated integer or group of integers or steps but not 20 the exclusion of any other integer or group of integers.

S* *The reference to any prior art in this specification is not, and should not be taken as, an acknowledgment or any form of suggestion that that prior art forms part of the common general knowledge in Australia.

Claims (6)

1. An automatic bread making machine, comprising: a chamber to receive bread making ingredients; a motor to permit mixing of the ingredients within the chamber; a heater for baking the ingredients within the chamber; a controller to control the operation of the motor and the heater; and a user interface to receive bread making instructions from a user and for displaying bread making status information to the user, the user interface operable to receive a pause instruction at any time in the bread making, the controller responding to the pause instruction to suspend execution of the bread making for a selected time interval and to resume execution of the bread making after the selected time interval has elapsed.

2. The bread making machine of claim 1 wherein the selected time interval is determined by the user.

3. The bread making machine of claim 1 wherein the selected time interval is determined °by the controller.

4. The bread making machine of claim 1 wherein the user interface panel includes a keyboard having a pause key actuatable by the user to transmit the pause instruction to the electronic control circuitry. The automatic bread making machine of claim 1, further comprising a dispenser operable to hold selected ones of the bread making ingredients and to dispense the selected ones of the bread making ingredients into the bread making chamber at a selected time.

6. The automatic bread making machine of claim 5 wherein the user interface is operable to receive bread making instruction information from a user and to display bread making status information to the user, the user interface being operable to receive an instruction from the user to selectively enable operation of the dispenser. P:\OPER\DH\2193182.DIV 7/7/99

13- 7. The automatic bread making machine of claim 5 wherein the controller produces an electric signal and the dispenser dispenses the selected ones of the bread making ingredients into the bread making chamber in response thereto. 8. The automatic bread making machine of claim 7 wherein the electric signal energizes a solenoid having a movable core, the movement of the core being mechanically communicated to dispense the selected ones of the bread making ingredients into the bread making chamber. 9. A method of baking bread in an automatic bread making machine having control o 10 circuitry operable to respond to bread making instructions from a user, comprising: receiving bread making ingredients; in response to a start instruction, beginning execution of a bread making sequence; i: :in response to a pause instruction, suspending execution of the bread making sequence at any point in the bread making sequence for a selected time interval; and after the selected time interval has elapsed, resuming execution of the bread making sequence. S" "10. The method of claim 9 wherein suspending execution of the bread making sequence 0*50 *S "includes the step of storing a current state of the bread making sequence, and wherein resuming execution of the bread making sequence includes the step of restoring the current state of the bread making sequence. P:\OPER\DH\2193182.DIV 7/7/99 -14- 11. The method of claim 9, further comprising: temporarily holding selected ones of the bread making ingredients in a dispenser; receiving instruction information from a user to selectively enable operation of the dispenser; and dispensing the selected ones of the bread making ingredients into the chamber. DATED this 7th day of July, 1999 10 SALTON-MAXIM HOUSEWARES, INC. •o By its Patent Attorneys: DAVIES COLLISON CAVE O S S o o 5 eS S S C 5*