Heating Regulator

Abstract

To provide a heating cooker which allows lock release before opening a door to be performed easily even by one hand by a non-mechanical operation, and which automatically performs door locking.SOLUTION: A heating cooker 100 includes: a body 10; a door 12; a latch head 14 provided at the door 12; a holding member provided at the body 10, and for bringing the door 12 into a lock state by holding the latch head 14; a door opening button 15; a door lock release key 16b; a displacement transmission mechanism for transmitting the displacement of the door opening button 15, and for releasing the lock state of the door 12 by the holding member by the displacement; a lock cam 31 movable between a limit position PL which limits at least one of the displacement of the door opening button 15 and the transmission of the displacement transmission mechanism, and a non-limit position PNL which limits neither of them; and a drive part for moving the lock cam 31 to the non-limit position PNL in response to the operation with respect to the door lock release key 16b.SELECTED DRAWING: Figure 5A

Description

[Technical Field]

[0001] The present disclosure relates to a cooking appliance such as a microwave oven that heats an object to be heated using microwaves or the like, and in particular to a cooking appliance configured so that a door at the front opening of a heating chamber is opened by mechanical operation of a push button, handle, or the like. [Background technology]

[0002] In the heating equipment described in Patent Document 1, the opening and closing door 3 (door) of the heating chamber 2 provided in the heating device main body 1 is configured so that it does not open during heating or when the temperature of the heating chamber is high, by inserting a hook 5 into an insertion hole 6 on the top surface of the door 3 either intentionally or automatically by the user, thereby restricting the opening of the door 3 and preventing inadvertent operation of the door 3. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-139120 Summary of the Invention [Problem to be solved by the invention]

[0004] In order to open the door 3 of the heating device described in Patent Document 1, the following two-stage mechanical operation must be performed. (1) Open the front panel 10 of the operation unit and slide the knob 7 upward to release the lock by the hook 5. (2) Hold the handle 4 and open the door 3 towards you.

[0005] Of these, the second mechanical operation is originally required in many conventional heating appliances, but the heating appliance described in Patent Document 1 also requires the first mechanical operation. In other words, these two mechanical operations are required every time the door 3 is opened, which may be troublesome for some users.

[0006] Furthermore, performing the mechanical operation to lock or unlock the door 3 each time may require using both hands, which may be inconvenient, and the tedious operation may lead to forgetting to lock the door.

[0007] The present disclosure aims to provide a cooking appliance that allows the door to be unlocked easily with one hand using a non-mechanical operation (the first mechanical operation described above) before opening the door, and that automatically locks the door. [Means for solving the problem]

[0008] The cooking device of the present disclosure comprises a main body having a heating chamber for accommodating an object to be heated, a door for opening and closing a front opening of the heating chamber, a locking member provided on the door, a holding member provided on the main body for holding the locking member to lock the door, a first operating member that can be displaced between a first position and a second position and is operated to open the door, a second operating member that is operated to unlock the door, a displacement transmission mechanism that transmits the displacement of the first operating member from the first position and unlocks the door by the holding member when the first operating member is displaced to the second position, a displacement transmission limiting member that can move between a limiting position that limits at least one of the displacement of the first operating member and the transmission by the displacement transmission mechanism and an unrestricted position that does not limit either the displacement of the first operating member or the transmission by the displacement transmission mechanism, and a drive unit that moves the displacement transmission limiting member to the unrestricted position in response to operation of the second operating member. [Effects of the Invention]

[0009] According to the present disclosure, unlocking of the door of a cooking appliance before opening it can be easily performed with one hand by a non-mechanical operation, and the door can be locked automatically. [Brief explanation of the drawings]

[0010] [Figure 1]FIG. 1 is a front view of a cooking device 100 according to a first embodiment of the present disclosure with a door 12 closed. [Figure 2] FIG. 2 is a front view of the cooking device 100 with the door 12 open. [Figure 3] 2 is a schematic diagram illustrating an example of an operation panel 16 of the cooking device 100. FIG. [Figure 4A] 1 is a perspective view of a lock unit 30 and its surroundings disposed near a door opening button 15 inside a main body 10. FIG. [Figure 4B] 1 is a cross-sectional view illustrating the basic operation of opening the door 12 by pressing the door-opening button 15. FIG. [Figure 5A] 3 is a perspective view showing the rotational position of a lock cam 31 inside a lock unit 30 in a door locked state. FIG. [Figure 5B] FIG. 4 is a cross-sectional view in a door locked state. [Figure 6A] 3 is a perspective view showing the rotational position of a lock cam 31 inside a lock unit 30 in a door unlocked state. FIG. [Figure 6B] FIG. 4 is a cross-sectional view showing the door unlocked state. [Figure 7] 2 is a block diagram showing a schematic electrical configuration of the cooking device 100. FIG. [Figure 8] 10 is a flowchart showing the process performed by the control unit 40 when the door lock release key 16b is operated. [Figure 9] 10 is a flowchart showing the process performed by the control unit 40 when the heating start key 16d is operated. [Figure 10] 10 is a flowchart showing the process performed by the control unit 40 when the door 12 is opened within a very short time after the door unlock key 16b is operated. [Figure 11] FIG. 10 is a perspective view showing a rotational position of a lock cam 31 in a door-locked state of a lock unit 30A according to a first modified example of the first embodiment of the present disclosure. [Figure 12A] 10 is a plan view showing the rotational position of a lock cam 31 when the door is locked by the lock unit 30A. FIG. [Figure 12B]10 is a plan view showing the rotational position of a lock cam 31 when the door of a lock unit 30A is in an unlocked state. FIG. [Figure 13A] FIG. 10 is a plan view showing a rotational position of a lock cam 31B in a door-locked state of a lock unit 30B according to a second modified example of the first embodiment of the present disclosure. [Figure 13B] 10 is a plan view showing the rotational position of a lock cam 31B when the door of the lock unit 30B is in an unlocked state. FIG. [Figure 14] FIG. 10 is a perspective view of a lock cam 31B as seen from below. DETAILED DESCRIPTION OF THE INVENTION

[0011] Embodiments of the present disclosure will be described with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals and description thereof will not be repeated.

[0012] First Embodiment 1.1 Overall basic configuration First, the basic configuration of the first embodiment of the present disclosure will be described. Fig. 1 is a front view of a cooking device 100 according to the first embodiment of the present disclosure with a door 12 closed. Fig. 2 is a front view of the cooking device 100 with a door 12 open. Fig. 3 is a schematic diagram illustrating an operation panel 16 of the cooking device 100.

[0013] As shown in Figures 1 and 2, the cooking device 100 includes a box-shaped main body 10 having a heating chamber 11 for accommodating an object to be heated, a door 12 for opening and closing the front opening 11a, a door opening button 15, and an operation panel 16.

[0014] Door 12 is pivotally supported on the left side of front opening 11a. Door 12 has a heat-resistant glass window 13 in the center so that the inside of heating chamber 11 can be seen, and latch heads 14 are provided in two locations on the back side of the side edge closest to operation panel 16. Interlock mechanisms 17 that hold these latch heads 14 are provided in corresponding positions on main body 10. These interlock mechanisms 17 are configured to prevent heating operation that emits microwaves unless door 12 is securely closed.

[0015] A horizontally long rectangular door open button 15 is provided near the bottom edge on the right side of the front opening 11a, and a vertically long rectangular operation panel 16 is disposed in the remaining portion.

[0016] The door open button 15 is configured so that when pressed by a user, the door lock state is released and the door 12 opens.

[0017] As shown in FIG. 3, the operation panel 16 includes a display 16a, a door lock release key 16b, a door lock status display 16c, a heating start key 16d, and a stop / cancel key 16e.

[0018] The display 16a is located near the top of the operation panel 16 and is capable of displaying four-digit numbers and letters, and displays the heating time being set, the remaining time during heating, the heating output level, the menu number, and the like.

[0019] The door unlock key 16b is an operation key that must be pressed immediately before pressing the door open button 15, and is located immediately below the display 16a to the right. Pressing the door unlock key 16b releases the door lock, and the door 12 can be opened by subsequently pressing the door open button 15. This cooking appliance 100 is configured so that the door lock is not released and the door open button 15 cannot be pressed unless the door unlock key 16b is pressed. In addition, a door lock status indicator 16c is located to the left of the door unlock key 16b, allowing the user to visually determine whether the door is locked or not. This door lock status indicator 16c brightly lights up the word "DOOR LOCKED" when the door is locked, and the word is turned off and invisible when the door is unlocked. This door lock status indicator 16c corresponds to the "display" in this disclosure.

[0020] The heating start key 16d is an operation key for starting the heating operation. The stop / cancel key 16e is an operation key for stopping the heating operation or canceling various settings midway. The operation panel 16 also has various other keys, but their explanation will be omitted.

[0021] 1.2 Lock unit 30 arranged inside main body 10 FIG. 4A is a perspective view of the lock unit 30 and its surroundings, which are arranged near the door open button 15 inside the main body 10. FIG. 4B is a cross-sectional view for explaining the basic operation of opening the door 12 by pressing the door open button 15. FIG. 5A is a perspective view showing the rotation position PL of the lock cam 31 inside the lock unit 30 in the door locked state. FIG. 5B is a cross-sectional view in the door locked state. FIG. 6A is a perspective view showing the rotation position PNL of the lock cam 31 inside the lock unit 30 in the door unlocked state. FIG. 6B is a cross-sectional view in the door unlocked state. Note that in FIGS. 5A and 6A, some of the components that make up the lock unit 30 are omitted to make the rotation position of the lock cam 31 easier to see.

[0022] As shown in these figures, the lock unit 30 includes a lock cam 31 that is involved in restricting the basic operation of opening the door 12, a cam phase detection switch 32 that detects the rotational position of this lock cam 31, and a synchronous motor 33 that rotates the lock cam 31.

[0023] The locking cam 31 has a cylindrical outer peripheral surface on both ends and is rotatably movable between at least a rotational position PL, which restricts the basic operation of opening the door 12, and a rotational position PNL, which does not restrict the basic operation. The rotational positions PL and PNL correspond to the "restricting position" and "non-restricting position" in this disclosure, respectively. When the door 12 opens, the locking cam 31 moves to the rotational position PNL so as not to interfere with the operation of pressing the door-opening button 15. This operation will be described later with reference to FIGS. 6A and 6B.

[0024] The cam phase detection switch 32 detects the phase as ON or OFF according to the rotational position of the lock cam 31. In this lock cam 31, the rotational position at which the cam phase detection switch 32 changes from ON to OFF is set as the initial position, which corresponds to the door locked state. The cam phase detection switch 32 may be, for example, a microswitch, but is not limited to this.

[0025] The synchronous motor 33 rotates the lock cam 31 in one direction, for example, counterclockwise (CCW). The motor that rotates the lock cam 31 is not limited to a synchronous motor, but may be, for example, a stepping motor. Furthermore, it is not limited to one-way rotation, but may also rotate in both directions. However, this is premised on the provision of a switch or the like necessary to accurately detect the rotational position of the lock cam 31 (at least the position corresponding to ★ in the door lock state).

[0026] The cooking appliance 100 also includes, inside the main body 10, a first lever 22 and a second lever 23 that transmit displacement caused by pressing the door-opening button 15. The displacement of the door-opening button 15 is transmitted from the second lever 23 to the first lever 22, and further to the latch head 14 that engages with the latch hook 21.

[0027] When the door-opening button 15 is pressed, an inner portion of the door-opening button 15 comes into contact with the second lever 23, causing the second lever 23 to rotate. This causes the second lever 23 to come into contact with the first lever 22, pushing up the first lever 22. The pushed-up first lever 22 then comes into contact with the latch head 14 provided on the back side of the door 12, pushing up the latch head 14. This disengages the latch head 14 from the latch hook 21, allowing the door 12 to open.

[0028] As shown in Figures 5A and 5B, when the lock cam 31 of the lock unit 30 is moved to the rotational position PL that restricts the basic operation of opening the door 12, the outer surface of the lock cam 31 is close to the inner portion of the door opening button 15.

[0029] Therefore, even if you try to press the door-opening button 15, the inner portion of the door-opening button 15 immediately comes into contact with the lock cam 31, and you cannot press it any further. As a result, the second lever 23 does not rotate, so the first lever 22 is not pushed up, and the latch head 14 is not pushed up either, and the engagement between the latch head 14 and the latch hook 21 is not released. In other words, the door 12 cannot be opened by pressing the door-opening button 15 (door locked state).

[0030] On the other hand, as shown in FIGS. 6A and 6B, when the lock cam 31 of the lock unit 30 is moved to the rotation position PNL, the outer circumferential surface of the lock cam 31 is sufficiently separated from the inner portion of the door-opening button 15.

[0031] Therefore, when the door open button 15 is pressed, the basic operation of opening the door 12 described above with reference to Figures 4A and 4B is performed. In other words, the door 12 can be opened by pressing the door open button 15 (door unlocked state).

[0032] The lock unit 30 is an example of a main component for realizing the cooking device of the present disclosure. Since it is only necessary to place and fix it near the door-opening button 15 inside the main body 10, there is no need to change the design of the main body 10 itself, and it can be retrofitted to many existing cooking devices.

[0033] 1.3 Electrical Configuration FIG. 7 is a block diagram showing a schematic electrical configuration of the cooking device 100. As shown in FIG.

[0034] As shown in FIG. 7, the cooking device 100 includes a control unit 40 that performs overall control.

[0035] The inputs to the control unit 40 are connected to a door state switch 41 that detects the open / closed state of the door 12 and a cam phase detection switch 32 that detects the phase corresponding to the rotational position of the lock cam 31.

[0036] On the other hand, the output from the control unit 40 is connected to the operation panel 16, a buzzer 44, a motor drive circuit 42 that drives the synchronous motor 33, and a magnetron drive circuit 43 that drives a magnetron (not shown) that emits microwaves. The buzzer 44 corresponds to the "alarm unit" of the present disclosure.

[0037] 1.4 Flowchart of main processes FIG. 8 is a flowchart showing the process performed by the control unit 40 when the door lock release key 16b is operated.

[0038] The control unit 40 monitors whether or not various keys arranged on the operation panel 16 are operated, and controls the cooking appliance 100 according to the operated key. The control unit 40 also monitors whether or not a door lock release key 16b arranged on the operation panel 16 is operated. Note that the process described below starts on the premise that the door 12 is closed, but a condition determination such as step S22 in Fig. 9 described below may be added. Alternatively, the monitoring of whether or not various keys arranged on the operation panel 16 are operated may be limited to when the door 12 is closed.

[0039] As shown in FIG. 8, in step S11, it is confirmed whether or not the door lock release key 16b has been operated. If no operation has been performed, the process returns to the previous step, and if an operation has been performed, the process proceeds to the next step S12.

[0040] In step S12, the phase of the lock cam 31 is initialized. Specifically, the synchronous motor 33 is driven by the motor drive circuit 42, and when it is detected that the cam phase detection switch 32 has changed from OFF to ON and then changed back to OFF, the synchronous motor 33 is braked and stopped. This causes the lock cam 31 to stop at the initial position (see FIGS. 5A and 5B) that corresponds to the door lock state.

[0041] In step S13, the motor drive circuit 42 drives the synchronous motor 33 for a fixed time (for example, 430 ms in this case) to rotate the lock cam 31 by 90 degrees. This causes the lock cam 31 to move to a rotation position corresponding to the door unlock state (see FIGS. 6A and 6B). Unlike when the lock cam 31 is rotated to the initial position (step S12), the 90-degree rotation can be controlled solely by the drive time of the synchronous motor 33. However, the specific drive time must be determined in advance based on the specifications of the synchronous motor 33, etc.

[0042] In step S14, the buzzer sounds twice to notify the user that the door has been unlocked, although this step may be omitted.

[0043] Thereafter, in step S15, the state of the door status switch 41 is monitored, and if the state of the door 12 changes to an open state within 10 seconds, the series of processes ends. However, if the state of the door status switch 41 does not change, it is determined that the user who was trying to open the door 12 did not actually open the door 12, and the process proceeds to step S16.

[0044] Since it is not desirable to leave the door unlocked even though the door 12 is closed, the door is set to be locked again. Prior to this, in step S16, the buzzer sounds once to notify the user. Here, the number of times the buzzer sounds makes it possible to clearly distinguish this from the case where the door is unlocked (step S14). However, this step may be omitted.

[0045] In step S17, similarly to step S12, the phase of the lock cam 31 is initialized, that is, the lock cam 31 is moved to an initial position corresponding to the door lock state.

[0046] FIG. 9 is a flowchart showing the process performed by the control unit 40 when the heating start key 16d is operated.

[0047] As shown in FIG. 9, in step S21, it is confirmed whether or not the heating start key 16d has been operated. If no operation has been performed, the process returns to the previous step, and if an operation has been performed, the process proceeds to the next step S22.

[0048] In step S22, the state of the door state switch 41 is detected, and if the detection result indicates that the door 12 is closed, the process proceeds to the next step S23. Otherwise (if the detection result indicates that the door 12 is open), the process returns to the original state without performing the processes from step S23 onwards. This is because the interlock mechanism 17 (see FIG. 2) prevents heating operation that emits microwaves from being performed unless the door 12 is securely closed.

[0049] In step S23, the phase of the lock cam 31 is detected by the cam phase detection switch 32. In step S24, the synchronous motor 33 is driven by the motor drive circuit 42 to start the rotational movement of the lock cam 31. In step S25, when it is detected that the cam phase detection switch 32 has changed from ON to OFF, the synchronous motor 33 is braked and stopped. This stops the lock cam 31 at its initial position corresponding to the door locked state. Note that steps S23 to S25 are substantially equivalent to the processing in step S12.

[0050] Through the processing up to this point, it is confirmed that the door 12 is closed, and the door is locked so that the door 12 cannot be opened by pressing the door open button 15. Then, in step S26, the magnetron is driven by the magnetron drive circuit 43 to start heating the object to be heated with microwaves.

[0051] 10 is a flowchart showing the processing by the control unit 40 when the door 12 is opened within an extremely short time after the door unlocking key 16b is operated. In the normal case where the door 12 is opened within the short time after the door unlocking key 16b is operated, the processing follows the flowchart shown in FIG.

[0052] In step S31, similarly to step S11 in FIG. 8, it is determined whether or not the door lock release key 16b has been operated, and if it has been operated, the process proceeds to the next step S32.

[0053] In step S32, the state of the door state switch 41 is confirmed, and only if the state of the door 12 changes to the open state within an extremely short time (for example, within 200 ms), the process proceeds to the next step S33, otherwise the process proceeds to step S34.

[0054] In step S33, the phase of the lock cam 31 is initialized, similarly to step S12 in Fig. 8. This is because, if the door open button 15 is pressed within an extremely short time after the door unlock key 16b is operated, the lock cam 31 may be forcibly rotated by the door open button 15. If the lock cam 31 is forcibly rotated by an external force, the phase (rotational position) of the lock cam 31 cannot be controlled correctly, and therefore the phase of the lock cam 31 must be initialized.

[0055] In step S34, similarly to step S17 in FIG. 8, the lock cam 31 is stopped at the initial position corresponding to the door lock state within a predetermined time.

[0056] In step S35, similarly to step S21 in FIG. 9, it is confirmed whether or not the heating start key 16d has been operated, and only if it has been operated, the process proceeds to the next step S36.

[0057] In step S36, similar to step S25 in Fig. 9, it is confirmed whether the lock cam 31 has moved to the initial position corresponding to the door lock state, and the confirmation is repeated until the movement is completed. If it is confirmed that the movement is completed, the process proceeds to the next step S37.

[0058] In step S37, similarly to step S26 in FIG. 9, the magnetron is driven by the magnetron drive circuit 43 to start heating the object to be heated with microwaves.

[0059] To minimize the occurrence of such a somewhat unusual situation, it is preferable to place the door unlocking key 16b as far away as possible from the door open button 15. This is because it takes a certain amount of time from when the door unlocking key 16b is operated until the door open button 15 is pressed. For example, it is preferable to place the door unlocking key 16b at the top of the operation panel 16, or to place it at least half the length of the operation panel 16 in the longitudinal direction (height direction) or more away.

[0060] <First Modification of First Embodiment> The first modification will be described below, in which the lock unit 30 of the first embodiment is replaced with a lock unit 30A. This lock unit 30A utilizes the automatic reverse function of a synchronous motor and the phase detection of the lock cam by a microswitch, similar to the first embodiment.

[0061] Fig. 11 is a perspective view showing the rotational position of lock cam 31 in a door-locked state of lock unit 30A according to a first modified example of the first embodiment of the present disclosure. Fig. 12A is a plan view showing the rotational position of lock cam 31 in a door-locked state of lock unit 30A. Fig. 12B is a plan view showing the rotational position of lock cam 31 in a door-unlocked state of lock unit 30A. Note that in these figures, the synchronous motor and other components of lock unit 30A are omitted from illustration to make the rotational position of lock cam 31A easier to see.

[0062] The lock unit 30A includes a lock cam 31, a cam phase detection switch 32A, a synchronous motor 33, and a stopper pin 34A.

[0063] The motor drive circuit 42 drives the synchronous motor 33, and when the actuator of the microswitch 32A is pressed into the lock cam 31 and turns ON, the synchronous motor 33 is stopped, returning the lock cam 31 to its initial state. When the synchronous motor 33 is driven from this state, the lock cam 31 collides with the stopper pin 34A, and the rotation direction of the synchronous motor 33 reverses from CCW to CW. When the lock cam 31 rotates CW, the microswitch 32A turns OFF, and by driving the synchronous motor 33 for a predetermined time from that point, the lock cam 31 can be stopped at the locked state position (initial position) (the state in FIG. 12A).

[0064] To unlock the door, the synchronous motor 33 is driven, causing the lock cam 31 to rotate counterclockwise after hitting the stopper pin 34A. As shown in Figure 12B, when it is detected that the cam phase detection switch 32 has changed from OFF to ON, the drive of the synchronous motor 33 is stopped. This causes the lock cam 31 to stop at a rotational position corresponding to the unlocked state of the door.

[0065] <Second Modification of First Embodiment> A second modified example will be described below in which the lock unit 30 of the first embodiment is replaced with a lock unit 30B. In this lock unit 30B, a lock cam 31B can be rotated in both directions by a stepping motor.

[0066] Fig. 13A is a plan view showing the rotational position of lock cam 31B in a door-locked state of lock unit 30B according to a second modified example of the first embodiment of the present disclosure. Fig. 13B is a plan view showing the rotational position of lock cam 31B in a door-unlocked state of lock unit 30B. Note that in these figures, the stepping motor and other components of lock unit 30B are omitted from the illustration to make the rotational position of lock cam 31B easier to see.

[0067] The lock unit 30B includes a lock cam 31B, a stepping motor (not shown), a stopper pin 34B, and a pinion gear 35B.

[0068] The lock cam 31B is provided with a cam inner groove 31Ba and a cam outer peripheral gear 31Bb. A stopper pin 34B is disposed inside the cam inner groove 31Ba to limit the rotation of the lock cam 31B to a range of approximately 90 degrees. The pinion gear 35B transmits rotation from the stepping motor to the cam outer peripheral gear 31Bb, causing the lock cam 31B to rotate.

[0069] In this lock unit 30B, the motor drive circuit 42 drives the stepping motor to rotate the lock cam 31B clockwise (CW). This rotation causes one end of the cam inner groove 31Ba of the lock cam 31B to abut against the stopper pin 34B, as shown in FIG. 13A. The lock cam 31B cannot rotate any further and the stepping motor loses synchronization, so the drive of the stepping motor is stopped at this rotation position. This stops the lock cam 31B at its initial position, which corresponds to the door locked state.

[0070] To unlock the door, the stepping motor is driven in the reverse direction by a predetermined number of pulses to rotate the lock cam 31B counterclockwise. This rotation stops the lock cam 31B at a rotation position corresponding to the unlocked state without causing the cam inner groove 31Ba of the lock cam 31B to collide with the stopper pin 34B, as shown in Fig. 13B.

[0071] FIG. 14 is a perspective view of the lock cam 31B as seen from below.

[0072] As shown in FIG. 14, a slot 36Bc for a flat-head screwdriver is provided on the lower shaft of the lock cam 31B.

[0073] A lock unit 30B equipped with such a lock cam 31B is disposed inside the main body near the door-opening button 15, and a hole into which a flathead screwdriver can be inserted is provided on the bottom of the main body. It is usually preferable to cover this hole with a cap or the like.

[0074] With this configuration, even if the door cannot be unlocked by operating the door unlock key 16b due to a power outage or other malfunction, the lock cam 31B can be rotated by inserting a flathead screwdriver. This allows the door to be manually unlocked, and the door 12 can be opened by pressing the door open button 15.

[0075] The embodiments of the present disclosure have been described above with reference to the drawings. However, the present disclosure is not limited to the above embodiments and can be implemented in various forms without departing from the spirit and scope of the present disclosure. Furthermore, various inventions can be formed by appropriately combining multiple components disclosed in the above embodiments. For example, some components may be omitted from all components shown in the embodiments. The drawings mainly show each component in a schematic manner to facilitate understanding, and the number of each component shown may differ from the actual number due to the convenience of drawing. Furthermore, the components shown in the above embodiments are merely examples and are not particularly limited, and various modifications are possible within a scope that does not substantially deviate from the effects of the present disclosure. [Industrial Applicability]

[0076] INDUSTRIAL APPLICABILITY The present disclosure is applicable to fields such as cooking appliances that are configured to open a front opening door of a heating chamber by mechanical operation. [Explanation of symbols]

[0077] 100 Cooker 10 Main Unit 11 Heating chamber 11a Front opening 12 doors 13 Heat-resistant glass window 14 Latch Head 15 Door open button 16 Operation panel 16a Display 16b Door unlock key 16c Door locked display 16d Heating start key 16e Stop / Cancel key 17 Interlock mechanism 21 Latch Hook 22 First Lever 23 Second Lever 30 Lock Unit 30A Lock Unit 30B Lock Unit 31 Rock Cam 31B Lock Cam 31Ba Cam groove 31Bb Cam outer gear 32 Cam phase detection switch 32A Cam Phase Detection Switch 33 Synchronous motor 34A Stopper pin 34B Stopper pin 35B pinion gear 36Bc slot for flathead screwdriver 40 Control Unit 41 Door status switch 42 Motor drive circuit 43 Magnetron drive circuit 44 Buzzer

Claims

1. a main body having a heating chamber for accommodating an object to be heated; a door for opening and closing a front opening of the heating chamber; a locking member provided on the door; a holding member provided on the main body and holding the locking member to lock the door; a first operating member that is displaceable between a first position and a second position and that is operated to open the door; a second operating member that is operated to unlock the door; a displacement transmission mechanism that transmits a displacement of the first operating member from the first position and releases the locked state of the door by the holding member when the first operating member is displaced to the second position; a displacement transmission limiting member that is movable between a limiting position that limits at least one of the displacement of the first operating member and the transmission by the displacement transmission mechanism, and a non-limiting position that does not limit either the displacement of the first operating member or the transmission by the displacement transmission mechanism; a drive unit that moves the displacement transmission limiting member to the non-limiting position in response to an operation of the second operating member; A heating cooker comprising:

2. The cooking device according to claim 1 , further comprising a control unit that electrically controls the movement of the displacement transmission limiting member to the non-limiting position by the drive unit.

3. The cooking device according to claim 1 or 2, further comprising an indicator that visually indicates whether the door is locked or not.

4. 3. The cooking device according to claim 1, further comprising an alarm unit that acoustically notifies a user that the door has been locked or unlocked.

5. The cooking device according to claim 2 , wherein the control unit causes the drive unit to move the displacement transmission limiting member to the limiting position before a heating operation starts.

6. 3. The cooking device according to claim 1, wherein the displacement transmission limiting member is configured to be manually movable to the non-limiting position from outside the main body.

7. an operating unit provided on a front surface of the main body and including the first operating member and the second operating member; 3. The cooking device according to claim 1, wherein the first operating member and the second operating member are spaced apart by at least half of the longitudinal length of the operating portion.

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