JP2014073290A - Automatic bread maker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic bread maker reliably resolving motor lock.SOLUTION: The automatic bread maker is provided with: a cooking container which is housed in a baking chamber set inside a machine body and into which cooking materials can be put; a kneading vane which rotates in the cooking container to knead the cooking materials put in the cooking container; a motor which generates rotary driving power for the kneading vane; motor control means which controls drive of the motor; motor lock detection means which detects that the motor is locked. The motor control means stops the drive of the motor when the motor lock detection means detects the lock of the motor, and supplies an electric current greater than that in normal starting so as to restart the motor after a lapse of a predetermined period of time.

Description

  The present invention relates to an automatic bread maker mainly used in general households.

  In recent years, automatic bread machines that can easily make bread even in ordinary households have come to be used frequently. Conventionally, this type of automatic bread maker has a motor that gives rotational driving force to kneading blades for kneading cooking ingredients and mill blades for pulverizing grains, and bread can be manufactured by driving this motor. As For this reason, there has been disclosed an apparatus that detects an abnormality of a motor in order to increase the safety of such an automatic bread maker or to suppress the occurrence of a failure (see, for example, Patent Document 1).

  Patent Document 1 detects the magnitude of the current supplied to the motor, and detects the abnormality of the motor based on the detection result if the magnitude of the current supplied to the motor is equal to or greater than a predetermined threshold. An automatic bread machine is disclosed.

  In the automatic bread maker of Patent Document 1, if an excessive current is generated in the circuit due to the motor being locked or the like, it is detected as an abnormality of the motor and cooking in progress is stopped or stopped (predetermined time has elapsed). The cooking is resumed later).

JP 2012-1000079 A

  However, in the conventional configuration, cooking is stopped even in the case of a motor lock that is not a malfunction of the motor. In the kneading step (kneading step) for kneading the cooking material, auxiliary materials such as dry yeast are added to the cooking material, and these are kneaded to produce bread dough. For this reason, as the process proceeds, bread dough having a predetermined elasticity is gradually manufactured, and at the same time, the load on the motor increases. Of course, it is designed that the motor is driven without any problems in normal times, but when the cooking is started at a low ambient temperature, or when the user starts cooking by mistake in the mixing of cooking ingredients, or When bread dough having a certain elasticity or more is produced, such as when both conditions overlap, the load on the motor exceeds the design value, and it may be determined that the motor is locked and cooking may be stopped.

  Also, in the pulverization process (mill process) for pulverizing the grain, if the grain is sandwiched between the pulverization blade and the cover that guards the pulverization blade, the motor can be driven with normal driving force (torque). Therefore, it was determined that the motor was locked and cooking could be stopped.

  In such a case, if cooking is stopped, the user has to discard the ingredients and start cooking again from the beginning.

  Even if cooking is not stopped and cooking is temporarily stopped and cooking is resumed after a lapse of a predetermined time, if the conditions at the time of starting the motor are the same, the situation at the time of motor lock is not improved and the motor may be locked again. Was expensive.

  The present invention solves the above-described conventional problems, and an object thereof is to provide an automatic bread maker that can more reliably eliminate motor lock.

  In order to solve the above-mentioned conventional problems, the automatic bread maker of the present invention is housed in a baking chamber provided inside the apparatus main body, and is rotated in the cooking container in which cooking ingredients are put, and in the cooking container. The kneading blade for kneading the cooking material put in the cooking container, the motor for generating the rotational driving force of the kneading blade, the motor control means for controlling the driving of the motor, and the motor locked A motor lock detecting means for detecting the motor lock, the motor control means stops driving the motor when the motor lock detecting means determines that the motor lock is detected, and after a predetermined time has elapsed, A feature is that the motor is restarted by supplying a larger current than that at the time of startup.

  With this configuration, since the starting current is increased and the motor is restarted when the motor is locked, the driving force when starting the motor can be increased.

  According to the automatic bread maker of the present invention, when the motor is locked, the motor is restarted with a current larger than that at the normal start, so the driving force at the start of the motor is increased and the motor lock is more reliably eliminated. can do.

1 is a perspective view of an automatic bread maker according to a first embodiment of the present invention. It is a perspective view which shows the state which opened the cover body of the automatic bread maker of FIG. It is sectional drawing of the automatic bread maker of FIG. It is sectional drawing which shows the structure of the components relevant to the inverter motor of the automatic bread maker of FIG. It is a perspective view of the blade | wing unit with which the automatic bread machine of FIG. 1 is provided. It is a control block diagram of the inverter motor of the automatic bread maker of FIG. It is a figure which shows the characteristic of the inverter motor of the automatic bread maker of FIG. It is a schematic diagram which shows the flow of the bread-making course for rice grains performed with the automatic bread maker concerning 1st Embodiment of this invention. It is a graph which shows the change of the rotation speed of the preferable kneading | wing blade in the kneading process of the bread-making course for rice grains of FIG.

  According to 1st Embodiment of this invention, it was put in the cooking container by rotating in the cooking container which is accommodated in the baking chamber provided in the inside of an apparatus main body, and a cooking material is put, and a cooking container. A kneading blade for kneading the cooking material, a motor for generating a rotational driving force of the kneading blade, a motor control means for controlling the driving of the motor, and a motor lock detecting means for detecting that the motor is locked. When the control means determines that the motor lock detection means has detected the lock of the motor, the control means stops driving the motor, and after a predetermined time elapses, supplies the motor with a current larger than that at the normal start time to restart the motor. It is characterized by.

  According to the second embodiment of the present invention, a cooking container that is stored in a baking chamber provided inside the apparatus main body and into which a cooking material containing grain is put, and a center axis of the mill shaft in the cooking container is the center of rotation. The mill blades that pulverize the grain grains put in the cooking container by rotating as the center of rotation of the kneading shaft in the cooking container, the cooking material put in the cooking container Kneading blades for kneading, a single motor for generating the rotational driving force of the mill blades and the kneading blades, motor control means for controlling the driving of the motor, and motor lock detecting means for detecting that the motor is locked When the motor control means determines that the motor lock detection means has detected the lock of the motor, the motor control means stops the motor, and after a predetermined time has elapsed, supplies a larger current to the motor than at normal startup to restart the motor. Characterized in that to.

  According to the third embodiment of the present invention, the motor current detecting means for detecting the current flowing through the motor is provided, and the motor lock detecting means is configured such that when the current detected by the motor current detecting means is equal to or greater than a predetermined threshold, It is characterized in that it is determined to be locked.

  According to the fourth embodiment of the present invention, the rotation speed detection means for detecting the rotation speed of the motor is provided, and the motor lock detection means continuously detects the rotation speed of the motor detected by the rotation speed detection means for a predetermined time or more. The motor is determined to be locked when it is equal to or less than a predetermined threshold value.

  According to the fifth embodiment of the present invention, the motor control means increases the supply current at the time of restarting the motor stepwise in accordance with the number of motor locks detected by the motor lock detection means.

  According to the sixth embodiment of the present invention, the number of motor locks detected by the motor lock detection means is initialized every time the manufacturing process in the cooking sequence changes.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First Embodiment The overall configuration of an automatic bread maker according to a first embodiment of the present invention will be described. FIG. 1 is a perspective view of the automatic bread maker according to the first embodiment, and FIG. 2 is a perspective view showing a state in which the lid of the automatic bread maker is opened. FIG. 3 is a cross-sectional view of the automatic bread maker according to the first embodiment. FIG. 4 is a partially enlarged sectional view of the automatic bread maker according to the first embodiment. FIG. 5 is a perspective view of a blade unit included in the automatic bread maker according to the first embodiment.

  1 to 3, the automatic bread maker 1 according to the first embodiment includes a device body 10 having a substantially rectangular parallelepiped shape. An operation unit 20 is provided on a part of the upper surface of the device main body 10.

  The operation unit 20 includes an operation key group and a display unit. The operation key group includes, for example, a start key, a cancel key, a timer key, a reservation key, a selection key for selecting a cooking course for bread, and the like. The cooking course includes, for example, a course for manufacturing bread using rice grains as a starting material, a course for manufacturing bread using wheat flour as a starting material, and the like. The display unit is composed of, for example, a liquid crystal display panel and displays time, contents set by the operation key group, errors, and the like.

  A firing chamber 30 is provided inside the apparatus main body 10. The baking chamber 30 is formed in a box shape with an upper surface opened. A cooking container 40 for storing cooking materials such as bread dough, cake, and rice cake is detachably stored in the baking chamber 30.

  Moreover, inside the baking chamber 30, as shown in FIG. 3, it is an example of the sheathed heater 31 which is an example of the heating part which heats the cooking container 40, and the temperature detection part which detects the temperature in the baking chamber 30. A temperature sensor 32 is provided.

  The sheathed heater 31 is arranged so as to surround the lower part of the cooking container 40 accommodated in the baking chamber 30 with a gap. The temperature sensor 32 is arranged at a position slightly away from the sheathed heater 31 so that the average temperature in the baking chamber 30 can be detected.

  The upper surface opening of the baking chamber 30 is opened and closed by a lid 50 provided on the upper part of the device main body 10. The lid 50 is rotatably attached to a hinge portion 10A provided at the upper rear portion (upper right side in FIG. 3) of the device main body 10. The lid 50 includes a lid body 51 and an outer lid 52. The lid main body 51 is attached with a secondary material container 53 for storing powdery secondary materials such as gluten and dry yeast, and a secondary material container 54 for storing secondary materials having a relatively large volume such as raisins and nuts. Yes. The auxiliary material containers 53 and 54 are disposed above the cooking container 40. The outer lid 52 is attached so that the upper openings of the auxiliary material containers 53 and 54 can be opened and closed.

  The bottom wall of the auxiliary material container 53 is configured by an opening / closing plate 53a. The opening / closing plate 53 a is configured to be rotatable so that the auxiliary material in the auxiliary material container 53 can be put into the cooking container 40. Similarly, the bottom wall of the auxiliary material container 54 is constituted by an opening / closing plate 54a. The opening / closing plate 54 a is configured to be rotatable so that the auxiliary material in the auxiliary material container 54 can be put into the cooking container 40. The opening / closing timing of the opening / closing plates 53a, 54a is controlled by the control unit 90 described later.

  A cooking container support 11 is provided at a substantially central portion of the bottom wall 30 a of the baking chamber 30. As shown in FIG. 4, the cooking container support portion 11 is formed in a substantially cylindrical shape and has an inner diameter that gradually decreases as the distance from the bottom wall 30 a of the baking chamber 30 decreases. A first pulley 61 is provided via a bearing 12 at the lower end of the outer peripheral surface of the cooking container support 11.

  A substantially cylindrical third one-way clutch 13 is provided in the central hole at the bottom of the cooking vessel support 11. A substantially cylindrical body-side kneading shaft 16A is provided inside the third one-way clutch 13 so as to extend in the vertical direction. The third one-way clutch 13 allows rotation of the main body side kneading shaft 16A in the forward direction (for example, clockwise) while restricting rotation of the main body side kneading shaft 16A in the reverse direction (for example, counterclockwise). It is configured.

  A second one-way clutch 15 is provided at the lower outer periphery of the main body side kneading shaft 16A. The second one-way clutch 15 is provided to engage with the first pulley 61. When the first pulley 61 rotates in the forward direction, the second one-way clutch 15 rotates the main body side kneading shaft 16A in the forward direction, while the first pulley 61 rotates in the reverse direction. The rotation of the main body side kneading shaft 16A is restricted so that the shaft 16A does not rotate in the reverse direction.

  A substantially cylindrical body-side mill shaft 14A is provided inside the body-side kneading shaft 16A so as to extend in the vertical direction. The main body side mill shaft 14A is provided to be rotatable relative to the main body side kneading shaft 16A. A second pulley 62 is fixed to the lower end portion of the main body side mill shaft 14A.

  In addition, an inverter motor 70 which is an example of a motor is provided outside the baking chamber 30 and inside the apparatus main body 10. The inverter motor 70 is a motor that can freely change the rotation speed and rotation direction (forward direction, reverse direction) of the output shaft 71 per unit time.

  A third pulley 63 is fixed to the upper periphery of the output shaft 71 of the inverter motor 70. A first belt 65 is wound around the third pulley 63 and the first pulley 61. When the inverter motor 70 is driven and the output shaft 71 rotates, the rotational force of the output shaft 71 is transmitted to the first pulley 61 via the third pulley 63 and the first belt 65.

  In addition, a fourth pulley 64 is provided via a bearing 67 at the lower outer periphery of the output shaft 71 of the inverter motor 70. A second belt 66 is wound around the fourth pulley 64 and the second pulley 62.

  In addition, a first one-way clutch 68 is provided between the third pulley 63 and the fourth pulley 64 on the outer peripheral surface of the output shaft 71 of the inverter motor 70. The first one-way clutch 68 rotates the fourth pulley 64 in the reverse direction when the output shaft 71 rotates in the reverse direction, while the fourth pulley 64 rotates in the normal direction when the output shaft 71 rotates in the forward direction. The rotation of the fourth pulley 64 is restricted so as not to rotate in the direction.

  A main body side connector 17A is fixed to the upper end portion of the main body side mill shaft 14A. The main body side connector 17A is configured to be engageable with a container side connector 17B fixed to a lower end portion of a substantially cylindrical container side mill shaft 14B. When the main body side mill shaft 14A rotates with the main body side connector 17A and the container side connector 17B engaged, the container side mill shaft 14B rotates.

  Further, an engagement piece 16Aa is provided at the upper end of the main body side kneading shaft 16A. The engagement piece 16Aa is configured to be engageable with an engagement piece 16Ba fixed to the lower end portion of the substantially cylindrical container side kneading shaft 16B. When the main body side kneading shaft 16A rotates, the engaging piece 16Aa engages with the engaging piece 16Ba, and the container side kneading shaft 16B rotates.

  The container side mill shaft 14B is provided inside the container side kneading shaft 16B via a cylindrical bearing 18. The container-side mill shaft 14B and the container-side kneading shaft 16B protrude into the cooking container 40 through a through hole provided at the center of the bottom of the cooking container 40 when the cooking container 40 is set in the baking chamber 30. It is provided as follows.

  As shown in FIG. 3, a bottomed cylindrical recess 41 is formed at the bottom of the cooking container 40. Moreover, the cylindrical base 42 is provided in the bottom outer surface of the cooking container 40 so that the container side kneading shaft 16B may be surrounded. The cooking container 40 is set in the baking chamber 30 by placing the base 42 on the cooking container support 11 and engaging the main body side connector 17A and the container side connector 17B. On the other hand, the cooking container 40 can be removed from the baking chamber 30 by disengaging the main body side connector 17A and the container side connector 17B. The pedestal 42 may be formed separately from the cooking container 40 or may be formed integrally with the cooking container 40.

  A blade unit 80 is detachably attached to portions of the container-side mill shaft 14B and the container-side kneading shaft 16B that protrude into the cooking container 40.

  The blade unit 80 includes a cap 81, a mill blade 82, a dome-shaped cover 83, a kneading blade 84, and a safety cover 85.

  The cap 81 is detachably provided at the tip of the container side mill shaft 14B. The mill blade 82 is provided so as to protrude outward from the outer peripheral surface of the cap 81. The mill blade 82 is a blade for pulverizing grain grains such as rice grains to produce a bread-making material. In a state where the cooking container 40 is set in the baking chamber 30 and the cap 81 is attached to the container-side mill shaft 14B, the mill blade 82 is provided so as to be generally located in the recess 41 of the cooking container 40. .

  The dome-shaped cover 83 is formed so as to cover the mill blade 82 from above. As shown in FIGS. 4 and 5, the dome-shaped cover 83 is provided with a plurality of window portions 83 a that connect the space inside the dome-shaped cover 83 and the space outside the dome-shaped cover 83. The bread-making raw material produced by the rotation of the mill blades 82 is discharged to the space inside the dome-shaped cover 83 and the space outside the dome-shaped cover 83 through the plurality of windows 83a.

  The kneading blades 84 are provided so as to stand vertically on the outer surface of the dome-shaped cover 83. The kneading blades 84 are blades for producing bread dough by kneading the bread-making ingredients in the cooking container 40.

  The safety cover 85 is attached to the lower end portion of the dome-shaped cover 83 and is formed so as to cover the mill blade 82 from below. The safety cover 85 is attached to the container-side kneading shaft 16B so that a part of the safety cover 85 is fitted to the inner surface of the container-side kneading shaft 16B. When the container-side kneading shaft 16B rotates, the safety cover 85, the dome-shaped cover 83, and the kneading blade 84 rotate integrally. In a state where the cooking container 40 is set in the baking chamber 30 and the safety cover 85 is attached to the container-side kneading shaft 16B, the mill blade 82 is provided so as to be generally positioned above the recess 41 of the cooking container 40. It has been. In addition, the safety cover 85 is provided with an opening (not shown) for taking materials such as rice grains and water put in the cooking container 40 into the dome-shaped cover 83.

  A control unit 90 that controls driving of each unit such as the inverter motor 70 is provided below the operation unit 20 of the device main body 10.

  The control unit 90 stores cooking sequences corresponding to a plurality of cooking courses. In the cooking sequence, when each manufacturing process such as water immersion, milling, cooling, kneading, fermentation, and baking is performed in order, the energizing time of the sheathed heater 31, the temperature adjustment temperature, the rotation direction of the inverter motor 70, and the rotation speed in each manufacturing process. A cooking procedure program in which the opening and closing timings of the opening and closing plates 53a and 54a are determined in advance.

  The control unit 90 controls driving of the inverter motor 70, the sheathed heater 31, and the opening / closing plates 53 a and 54 a based on the cooking sequence corresponding to the specific cooking course selected by the operation unit 20 and the temperature detected by the temperature sensor 32. To do.

  Here, the control of the inverter motor 70 will be described with reference to FIGS. 6 and 7. FIG. 6 is a control block diagram relating to the inverter motor 70. FIG. 7 is a diagram illustrating characteristics of the inverter motor 70.

  The control unit 90 supplies power to the inverter motor 70 via the inverter circuit unit 92 so that the rotation direction and rotation speed are determined. The inverter circuit 92 converts an AC power source into a DC power source, and creates a frequency for driving the motor by switching a transistor (not shown).

  The control unit 90 controls the switching of the transistor, changes the switching interval, thereby creating an arbitrary motor drive frequency and controls the rotation speed. The motor current detection means 93 detects a current flowing through the inverter motor 70 (hereinafter referred to as a motor current value) and inputs it to the control unit 90.

  The rotational speed detection means 94 calculates the rotational speed of the motor based on a signal from a Hall IC (not shown) installed in the inverter motor 70 and inputs it to the control unit 90. The control unit 90 issues a power supply command to the inverter motor 70 to the inverter circuit 92 based on these input values.

  In addition, the control unit 90 includes a motor lock detection unit 95 that detects motor lock. The motor lock means a state where the motor cannot be driven even if it is driven. Therefore, when the motor is locked, the motor does not rotate.

  At this time, the control unit 90 increases the supply current to the motor to drive the motor somehow. Utilizing these facts, the motor lock detection means 95 detects motor lock by two methods. One is that the rotation speed detected by the rotation speed detection means 94 continues for a predetermined time (0.3 seconds in the first embodiment) or more despite that the control unit 90 controls to drive the motor. Then, if it is equal to or less than a predetermined value (0 rpm in the first embodiment), it is a method for determining that the motor is locked. The other is a method of determining that the motor is locked if the current supplied to the motor detected by the motor current detecting means 93 is equal to or greater than a predetermined threshold (4.6 A in the first embodiment).

  When the control unit 90 receives the motor lock information from the motor lock detection unit 95, the control unit 90 stops the power supply to the inverter motor 70 and stops the inverter motor 70. Then, after a predetermined time (2 seconds in the first embodiment) has elapsed, the inverter motor 70 is restarted. At that time, the control is performed so that the motor is started at a larger current than that at the normal start (in the first embodiment, the current supplied to the motor at the normal start is 2A and at the restart is 4A). Since there is a proportional relationship between the current flowing through the motor and the motor driving force (torque) as shown in FIG. 7, if the current supplied to the motor is increased, a larger driving force (torque) can be generated. it can.

  Next, an example of the flow of the bread making course for rice grains executed by the automatic bread maker 1 according to the first embodiment will be described with reference to FIG. FIG. 8 is a schematic diagram showing the flow of the bread making course for rice grains executed by the automatic bread maker 1 according to the first embodiment. As shown in FIG. 8, in the bread making course for rice grains, a water immersion process, a mill process, a cooling process, a kneading (providing) process, a fermentation process, and a baking process are sequentially performed.

  When starting the rice grain breadmaking course, the user performs the following operations. First, the user attaches the cap 81 to the container side mill shaft 14B, and fits a part of the safety cover 85 to the inner surface of the container side kneading shaft 16B. Thereby, the blade | wing unit 80 is set in the cooking container 40, as shown in FIG.

  Thereafter, the user puts main ingredients such as rice grains, water, and seasonings (for example, salt, sugar, shortening) into the cooking container 40, and dry yeast, gluten, nuts, etc. that are automatically added during the bread manufacturing process. In the secondary material containers 53 and 54.

  Thereafter, the user sets the cooking container 40 in the baking chamber 30 and closes the upper surface opening of the baking chamber 30 with the lid 50. Thereafter, the user selects the bread making course for rice grains by using the operation unit 20, and presses the start key. Thereby, the control part 90 starts control operation | movement of the bread-making course for rice grain which manufactures bread using rice grain as a starting material.

  When the rice grain breadmaking course is started, the water immersion process is started by a command from the control unit 90. The water immersion process is a process for making the rice grains easily pulverized to the core in the subsequent milling process by adding water to the rice grains. In the water immersion process, the stationary state of the main material charged in advance in the cooking container 40 is maintained for a predetermined time (30 minutes in the first embodiment).

  When a predetermined time elapses from the start of the water immersion process, the water immersion process is terminated by a command from the control unit 90, and the mill process is started. A mill process is a process of grind | pulverizing the rice grain put in the cooking container 40, and manufacturing a bread-making raw material. In the milling process, the control unit 90 controls the inverter motor 70 to rotate the output shaft 71 in the reverse direction, and rotates the mill blade 82 (for example, 4000 rpm) in the mixture containing rice grains and water. Thereby, a rice grain is grind | pulverized.

  The mixture containing the pulverized rice grains and water is discharged into the space outside the dome-shaped cover 83 through the plurality of windows 83 a of the dome-shaped cover 83. Along with this, a mixture containing rice grains and water in the recess 41 of the cooking container 40 is taken into the space inside the dome-shaped cover 83 from an opening (not shown) provided in the safety cover 85. In this way, rice grains are crushed one after another by the mill blades 82, and as a result, a bread-making raw material containing pasty pulverized powder is produced.

  In addition, when the size of the rice grain colliding with the mill blade 82 is large, a loud collision sound is generated. For this reason, the control unit 90 can control the inverter motor 70 to rotate the mill blade 82 at a low speed for a predetermined time (for example, 5 minutes) from the start of the mill process, and then rotate the mill blade 82 at a high speed. preferable. Thereby, generation | occurrence | production of the loud collision sound in a mill process can be suppressed.

  In addition, if the starting current when starting the inverter motor 70 is large, the rotation starts vigorously, so that a mixture containing the crushed rice grains and water may be scattered in the cooking container 40. Furthermore, the above-described collision sound increases as the starting current increases. For this reason, it is preferable to suppress the starting current at the normal time as much as possible.

  However, when the user puts the main material into the cooking container 40, in some cases, the rice grains enter the space inside the dome upper cover 83, and if the space where the mill blade 82 rotates is not available, it cannot be easily rotated. Motor lock may occur. In this case, if the starting current, that is, the starting driving force is the same, the situation does not change and the motor lock is not released even if the restarting is repeated many times. Therefore, in the present embodiment, as described above, when motor lock occurs, restart is performed by increasing the start-up current compared to normal start-up. As a result, a larger impact load is applied than during normal startup, the situation is improved, and the motor lock is easily released.

  When a predetermined time (70 minutes in the first embodiment) elapses from the start of the milling process, the milling process is terminated by a command from the control unit 90, and the cooling process is started. The cooling step is a step of lowering the temperature of the bread-making raw material in the cooking container 40 that has been raised by the milling step to a temperature at which the dry yeast actively works (for example, around 30 ° C.). In the cooling process, the control unit 90 stops driving the inverter motor 70.

  When a predetermined time (32 minutes in the first embodiment) elapses from the start of the cooling process, the cooling process is ended by a command from the control unit 90, and the kneading process is started. The kneading step is a step of manufacturing bread dough by adding auxiliary materials such as dry yeast, gluten, and nuts to the bread-making material and kneading them. In the kneading process, the control unit 90 opens the opening / closing plates 53a and 54a and inputs the auxiliary material into the cooking container 40, and controls the inverter motor 70 to rotate the output shaft 71 in the forward direction, thereby making the bread-making material. The kneading blades 84 are rotated at a low speed (for example, 250 rpm) in the mixture containing the secondary material and the secondary material. Thereby, the mixture containing the bread-making raw material and the auxiliary material is kneaded, and the bread dough having a predetermined elasticity is manufactured.

  If the kneading blades 84 are continuously rotated at the same speed during the kneading process, particularly in the initial stage of the kneading process in which the kneading of the mixture containing the bread-making raw material and the auxiliary material has not progressed, There is a risk that the material splatters outside the cooking container 40. For this reason, as shown in FIG. 9, it is preferable that the controller 90 controls the inverter motor 70 so that the rotational speed of the kneading blades 84 gradually increases as the kneading process proceeds. Thereby, in a kneading process, it can suppress that a bread-making raw material and an auxiliary material scatter to the outer side of the cooking container 40. FIG.

  In addition, when cooking is started in a state where the ambient temperature is low, when the user starts cooking incorrectly by mixing the cooking ingredients, or when both conditions overlap, bread dough having elasticity greater than or equal to a predetermined value is obtained. Manufactured. At this time, if the dough is entangled with the kneading blades 84, the motor cannot be rotated and the motor may be locked. In this case, if the starting current, that is, the starting driving force is the same, the situation does not change and the motor lock is not released even if the restarting is repeated many times. Therefore, in the present embodiment, as described above, when motor lock occurs, restart is performed by increasing the start-up current compared to normal start-up. As a result, a larger impact load is applied than during normal startup, the situation is improved, and the motor lock is easily released.

  When a predetermined time (23 minutes in the first embodiment) elapses from the start of the kneading process, the kneading process is terminated by a command from the control unit 90, and the fermentation process is started. A fermentation process is a process of fermenting bread dough. In the fermentation process, the control unit 90 controls the sheath heater 31 to maintain the temperature of the baking chamber 30 at a temperature at which fermentation proceeds (for example, 38 ° C.).

  When a predetermined time (75 minutes in the first embodiment) elapses from the start of the fermentation process, the fermentation process is terminated by a command from the control unit 90, and the baking process is started. The baking step is a step of baking the fermented dough and baking the bread. In the baking process, the controller 90 controls the sheathed heater 31 to raise the temperature of the baking chamber 30 to a temperature suitable for baking (for example, 125 ° C.).

  When a predetermined time (40 minutes in the first embodiment) elapses from the start of the firing process, the firing process is terminated by an instruction from the control unit 90. Thereby, all the bread making processes are completed. The completion of all the bread making processes is notified to the user by, for example, a display on the liquid crystal panel of the operation unit 20 or a notification sound.

  According to the automatic bread maker 1 according to the first embodiment, when the motor lock detecting means 95 detects the lock of the motor, the motor is stopped, and after a predetermined time has elapsed, a larger current than that at the normal start is supplied to the motor. Therefore, the system can be restarted with a larger driving force, and the motor lock can be more reliably eliminated.

  Further, according to the automatic bread maker 1 according to the first embodiment, since it is determined that the motor is locked when it is equal to or greater than the predetermined threshold value detected by the motor current detecting means 93, the motor lock is disabled. It can be detected reliably.

  Further, according to the automatic bread maker 1 according to the first embodiment, when the rotational speed of the motor detected by the rotational speed detecting means 94 is equal to or less than a predetermined threshold, it is determined that the motor is locked. Therefore, the motor lock can be reliably detected.

  Second Embodiment An automatic bread maker according to a second embodiment of the present invention will be described. The difference between the automatic bread maker according to the second embodiment and the automatic bread maker according to the first embodiment is that the control unit 90 is stepwise in accordance with the number of motor locks detected by the motor lock detector 95. In addition, the supply current when the motor is restarted is increased.

  When the control unit 90 receives the motor lock information from the motor lock detection unit 95, the control unit 90 stops the power supply to the inverter motor 70 and stops the inverter motor 70. Then, after a predetermined time (2 seconds in the second embodiment) has elapsed, the inverter motor 70 is restarted. At that time, the motor is started with a larger current than that at the normal start, but the second time after the first motor lock and the third time from the second time. Increasing the supply current (In the second embodiment, the supply current to the motor at normal startup is increased by 1A, such as 2A, 3A at the first restart, 4A at the second restart, The third and subsequent times are fixed at 4A).

  If the motor is suddenly started with a large current at the first restart, the possibility that the motor lock will be released sooner and more is increased. However, as described in the first embodiment, the mill blade 82 and the rice grains are used during the milling. There is a problem that a loud collision sound is generated between the two. Moreover, if it is rotated with an unnecessarily large driving force during kneading, bread dough may be damaged, and cooking performance may be adversely affected. For such a problem, by increasing the supply current at the time of restarting step by step, it is possible to minimize the impact on the impact sound and cooking performance.

  According to the automatic bread maker according to the second embodiment, the control unit 90 increases the supply current when the motor is restarted step by step according to the number of motor locks detected by the motor lock detection means 95. Therefore, the motor lock can be reliably eliminated while suppressing the influence on the collision sound and cooking performance.

  << Third Embodiment >> An automatic bread maker according to a third embodiment of the present invention will be described. The automatic bread maker according to the third embodiment is different from the automatic bread maker according to the second embodiment in that the number of motor locks detected by the motor lock detector 95 is changed every time the manufacturing process in the cooking sequence is changed. It is a point to initialize.

  The control unit 90 gradually increases the supply current when the motor is restarted in accordance with the number of motor locks detected by the motor lock detection means 95. At this time, if the number of motor locks detected in the milling process is passed on to the subsequent kneading process as it is, when a motor lock occurs in the kneading process, the motor is suddenly restarted with a large current. In the milling process and the kneading process, the motor operation and the state of the cooking material have changed greatly, and if it is rotated with an unnecessarily large driving force as described in the second embodiment, the cooking performance may be adversely affected. is there.

  Therefore, the number of times of motor lock is initialized to 0 every time the manufacturing process such as milling and kneading changes, thereby minimizing the influence on the cooking performance.

  According to the automatic bread maker according to the third embodiment, the number of motor locks detected by the motor lock detection means 95 is initialized every time the manufacturing process in the cooking sequence is changed. The motor lock can be surely eliminated while suppressing the influence of.

  In addition, this invention is not limited to the said embodiment, It can implement in another various aspect. For example, in the above description, the inverter motor is used as the “motor”, but the present invention is not limited to this. For example, other motors such as an induction motor may be used.

  In this embodiment, the inverter motor is used in an automatic bread maker that performs both milling and kneading, but the present invention is not limited to this. You may use an inverter motor for the general automatic bread machine which only kneads. In this case, since the rotation speed of the kneading blade can be varied, for example, the inverter motor can be controlled so that the rotation speed of the kneading blade gradually increases as the kneading process proceeds. Thereby, it can suppress that a bread-making raw material and an auxiliary material scatter to the outer side of a cooking container.

  Further, in this embodiment, after the motor lock is detected, when the supply current at the time of restart is gradually increased, the current is increased by 1 A and fixed at 4 A, but the present invention is not limited to this. The increase range of the supply current and the maximum supply current may be determined in consideration of the influence on cooking performance and the maximum rated current of the motor.

  In the present embodiment, the time from when the motor lock is detected until the motor is stopped and restarted is set to 2 seconds. However, the present invention is not limited to this. If there is no fear of heat generation or abnormality of the motor, it may be started immediately after stopping.

  In this embodiment, the control unit 90 is configured to control the inverter circuit 92 and the like. However, the control unit 90 is configured separately from the control unit 90 and performs control related to motor drive control (for example, a semiconductor element). ) May be provided.

  Further, the function of the motor lock detection means 95 may be mounted in the control unit 90, or may be configured by a semiconductor element or the like separately from the control unit 90.

  Since the automatic bread maker according to the present invention can more reliably eliminate motor lock, it is particularly useful as an automatic bread maker used in general households.

DESCRIPTION OF SYMBOLS 10 Apparatus main body 30 Baking chamber 40 Cooking container 70 Inverter motor 82 Mill blade 84 Kneading blade 90 Control part (motor control means)
95 Motor lock detection means

Claims (6)

A cooking container that is stored in a firing chamber provided inside the apparatus body and into which cooking ingredients are placed;
Kneading blades for kneading the cooking material put in the cooking container by rotating in the cooking container;
A motor for generating a rotational driving force of the kneading blade;
Motor control means for controlling the driving of the motor;
Motor lock detecting means for detecting that the motor is locked;
With
When the motor control means determines that the motor lock detection means has detected the lock of the motor, the motor control means stops driving the motor, and after a predetermined time has elapsed, supplies a larger current to the motor than during normal startup. An automatic bread maker characterized by being restarted. A cooking container which is stored in a baking chamber provided inside the apparatus body and into which cooking ingredients including grain are placed;
Mill blades for crushing grains put in the cooking container by rotating around the central axis of the mill shaft in the cooking container,
A kneading blade for kneading the cooking material put in the cooking container by rotating around the central axis of the kneading axis in the cooking container;
A single motor for generating a rotational driving force of the mill blade and the kneading blade;
Motor control means for controlling the driving of the motor;
Motor lock detecting means for detecting that the motor is locked;
With
When the motor control means determines that the motor lock detection means has detected the lock of the motor, the motor control means stops the motor, and after a predetermined time has elapsed, supplies a larger current to the motor than when it was normally started to restart it. An automatic bread machine characterized by that. Motor current detecting means for detecting the current flowing through the motor;
3. The automatic bread making according to claim 1, wherein the motor lock detection unit determines that the motor is locked when a current detected by the motor current detection unit is equal to or greater than a predetermined threshold value. Machine. A rotation speed detecting means for detecting the rotation speed of the motor;
The motor lock detection means determines that the motor is locked when the rotation speed of the motor detected by the rotation speed detection means is continuously for a predetermined time or more and not more than a predetermined threshold value, The automatic bread maker according to any one of claims 1 to 3.   5. The automatic manufacturing method according to claim 1, wherein the motor control unit gradually increases a supply current at the time of restarting the motor according to the number of times of motor lock detected by the motor lock detection unit. Bread machine.   The automatic bread maker according to claim 4, wherein the number of motor locks detected by the motor lock detection means is initialized every time a manufacturing process in the cooking sequence changes.

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