KR20190115383A - A Control Method for Cooking Device Having an Automatically Opening Door - Google Patents

Abstract

The present invention relates to an operation control method of a door automatically opening mechanism of a cooking device. According to the control method, when power is supplied to a cooking device or a user turns on the cooking device, a lever (300), a pusher (500), and a pusher operation unit (600) are controlled to be aligned at a regular position. Moreover, after the user inputs a door opening command, an abnormality in each component concerned in door automatically opening operation can be checked through a change in a return stop switch and a change in an opening detection switch, which are generated in a first rotation process of a motor to perform door opening operation.

Description

A control method for cooking device having an automatically opening door

The present invention relates to a cooking appliance in which an automatic opening structure is applied and the door is automatically opened, and a method of controlling the operation of the door.

Cooking apparatuses such as ovens and microwave ovens generally have a rectangular parallelepiped appearance, and an interior cooking chamber is opened forward and a door is provided in front of the cooking chamber.

The door may be open in various ways, but a hinged door is pivotally rotated around a rotating shaft and is widely used. Most doors of this type are provided with handles or grooves that a user can grip.

Recently, a function of automatically opening and closing the door of the cooker has been added. However, the automatic opening method of the door implemented in the conventional cooking appliances has a problem in that a driving unit having a high output power is used because the door must be opened to overcome the elastic force added to the door in order to add the closing force of the door.

In addition, in the related art, a driving unit that provides an opening force for opening a door is installed near a rotating shaft of a door having a narrow space, which is complicated in structure design and manufacturing, and frequently malfunctions when exposed to a hot environment of a cooking chamber.

Patent Literature 1 discloses a door automatic opening structure in which a latch of a swing door is lifted by a cam to release opening. Two latches of the swing door are provided on one side of the door, and the latches interlock with each other. In other words, the operation of one latch and the operation of the other latch are connected to each other at the same time. And the cam that opens the door lifts one of the latches of the two latches upwards, the latch lifted upwards is pushed forward by the inclined surface provided on the upper part of the latch holder to open the door.

However, the door opening method of Patent Document 1 is based on the premise that the latch has a structure that interlocks with each other. In other words, the invention disclosed in Patent Literature 1 is a way in which the other latch is lifted up in conjunction with this by lifting any one of the latches, so that the latch is over the locking step of the main body in the state of simply lifting the one latch. Simply open the door.

In general, the latch provided on one side of the swing door is easy to configure to interlock with each other. However, in a cooker that uses a pull down door structure, the latches provided at the upper left and upper right sides of the door, respectively, are relatively far from the swing door, so that the latches of the two latches are very far from each other. If both latches are interlocked, it is cumbersome to redesign both the electromagnetic leakage structure of the door and the electromagnetic leakage structure of the main body. Therefore, the door automatic opening structure of patent document 1 is difficult to apply to the door of a pull-down system.

For this reason, the conventional automatic opening structure of the pull-down door has no choice but to install both the left latch and the right latch structure on both sides of the main body. However, a cooking appliance having a pull-down door does not have enough space on both sides of the main body as compared to a cooking appliance having a swing-type door. In addition, unless both latches are simultaneously lifted and the latch is not released, the automatic opening operation of the door is not performed smoothly.

On the other hand, the door opening method of Patent Document 1 implements the force of lifting the latch by the operation of the cam, the cam is directly connected to a driving means such as a motor, and five curved profiles are provided radially along the circumferential direction of the cam. Therefore, in order to secure the driving force of the cam, a motor generating such a large amount of power is required, or a reduction gear is necessary. And such a drive system is inevitably very heavy. Since the heavy drive system has such a large inertia force, it is often the case that the cam does not stop immediately at that position even if the cam profile presses the switch.

Problems occur when the door is closed if the cam does not stop in place. In other words, even if the latch is closed into the latch holder by closing the door, the force of pressing the cam at the lower end of the hook does not rotate the drive system. Thus, the latch is not completely seated in the latch holder and remains incompletely overlaid. This causes a misdetection of the sensor that detects the closing of the door, and the cooker recognizes that the door is not closed correctly and will not operate.

On the other hand, the automatic opening functions of the doors above include a motor and a cam which rotates thereby, and have a micro switch pressed by the cam to control the rotational displacement of the motor.

Patent Document 2 discloses a method for monitoring a door automatic opening mechanism having a latch (lock member) driven by a motor. The monitoring device verifies that the oven door lock is in the appropriate locked or unlocked position. If it detects that the oven door locking member is not in the proper position, the monitoring device repeatedly applies a pulse signal to the motor so that the locking member is in the correct position.

However, since the variation of the voltage applied to the motor cannot be taken into account, the control mechanism of the above method may not have a constant position of the locking member after one pulse signal.

In addition, in the above method, since the control of the locking member is not performed at a time by continuously sending a signal, a pulse signal must be applied several times. It will take more time.

In addition, the failure detection method as described above, proceeds to a separate procedure from the operation of the locking member. Therefore, the input power for the operation of the locking member and the pulse power required to detect the failure of the locking member must be operated separately. This approach complicates product power control.

United States Patent Application Publication No. US2011-0095019A1 United States Patent Application Publication US 7,225,804 B1

The present invention has been made to solve the above-mentioned problems, and even if the structure for automatically opening the door having a structure in which the two latches independently behave to any one latch is applied to a cooking appliance capable of automatically opening the door. It aims to provide.

In addition, an object of the present invention is to provide a cooking apparatus capable of automatically opening the door even with a low power drive unit.

In addition, an object of the present invention is to provide a cooking apparatus that is not affected by the hot environment of the cooking chamber and the reliability of the automatic opening operation is guaranteed.

In addition, an object of the present invention is to provide a cooking device that provides a clean appearance because the structure for automatically opening the door is not visible from the outside.

In addition, in order to solve the above problems, the present invention, while using a power source (continuous square wave AC power) that is normally input to the cooker instead of a repetitive pulse signal as it is continuously driving the motor, while the motor and its It is an object of the present invention to provide a method for controlling the automatic opening door operation of a cooker, in which the associated driving part is guaranteed to be in a correct position.

In addition, the present invention, by using a conventional input signal without generating a separate failure detection signal to drive the motor, while checking the detection signal of the monitoring device such as a switch for a predetermined time, the operation of the automatic door opening device It is an object of the present invention to provide a method of controlling the automatic opening door operation of a cooking apparatus that can monitor the operation.

In addition, an object of the present invention is to provide an automatic opening door operation control method capable of quickly checking whether an error occurs in the automatic opening mechanism of the door while proceeding with the automatic opening operation of the door.

The present invention includes a main body 710 having a cooking chamber therein, a door 720 for opening and closing an open front of the cooking chamber, and an opening / closing rotating shaft 814 serving as a rotation center of opening and closing of the door. The opening / closing rotation shaft 814 is located at the front lower portion of the main body 710 and centers around the horizontal rotation shaft extending in the left and right directions so that the door 720 is pivotally connected to the main body, and thus the door is It is a structure that is opened downward downward toward the center of the rotation shaft, the door may be applied to a pull-down type cooking appliance elastically added by a spring 823 in the direction in which the door is closed.

In the door auto-opening structure of the present invention, a horizontal pivot shaft 210 provided on the door 720 and extending toward the main body 710 is formed on a surface of the door 720 facing the main body 710. A latch 200 pivoting about the center is provided, and the door 720 is engaged with the latch 200 at a portion of the main body 710 corresponding to a position where the latch 200 is provided while the door 720 is closed. ) May be applied to a structure in which the latch holder 10 for maintaining the closed state or unlocking the latch 200 to open the door 720 is provided.

In order to solve the above-described problems, the present invention, the latch 200 inserted into the hook receiving space 180 inside the latch holder 10 in the latch holder 10, the opening direction of the door 720 The lever 300 is pushed out and the latch 300 is released from the latch holder 10 by using the lever 300.

To this end, the lever 300 lifts the latch 200 and pushes it in the opening direction of the door. The door 720 has a greater force than the force of the spring 823 at the angle a1 slightly opened by the lever 300 so that the door 720 is opened by its own weight. 720 is opened by its own weight.

According to such a structure, since the lever 300 is not exposed to the outside, even if the automatic opening structure of the door is applied, such a structure is not visible to the outside, thereby providing a clean appearance and improving quality sensitivity.

In addition, the door 720 can be opened by the weight of the door 720 without the need to drive the door 720 to the fully opened position in order to open the door 720 automatically, it is very easy to open the door automatically Simple to implement.

Here, the latch 200 is provided at both sides of the door 720, the two latch 200 is rotated independently, the lever 300 is any one of the latch holder 10 of the two latch 200. It may be provided only in the holder 10. That is, according to the present invention, both latches can be released by only pushing one of two latches that operate independently of each other.

When the door is opened downward without any damping by self weight, the door is shocked or the connection part of the door and the main body is impacted, so that the door is fully open at an opening angle a2 larger than the opening angle a1. Up to an angle a3, the damping force may be applied in the opposite direction to the direction in which the door 720 is opened.

The opening angle a2 at which the damping force starts to act may be 30 ° or more and 40 ° or less so that the door is opened slowly by being sufficiently damped, and the door is not opened too slowly.

The damping force may be released 0 ° to 5 ° before the maximum opening angle a3 of the door, thereby inducing the door to be fully opened without being incompletely opened.

The latch 200 includes a latch bar 220 extending from the door toward the main body and a hook portion 230 provided to protrude downward from an end of the latch bar 220.

The latch 200 is biased in the downward direction of the hook portion 230. In addition, a rear slope surface 231 extending from the lower end of the hook portion 230 toward the latch bar 220 is provided on the rear surface of the hook portion 230 which faces the door, and the door 720 is closed. The back sloped surface 231 maintains an interference state with the inner sloped surface 112 of the latch holder 10.

The inner inclined surface 112 has a form inclined upward from the main body toward the door so as to correspond to the rear inclined surface 231, so that the user can manually open the latch holder to which the automatic opening structure is applied. .

By simply lifting the latch 200 by the lever 300, the latch 200 may not be released from the latch holder. While the latch 200 is lifted by the lever 300, it should be able to be pushed out in the opening direction of the door. Thus, the lever 300 pushes the latch 200 in the diagonal direction between the front and the upper direction. Then, the latch 200 can be separated out of the latch holder beyond the structure that latched the latch.

The lever 300 is provided with a push part 330 in contact with the latch 200, and the push part 330 is disposed below the center of rotation of the lever 300 and the push part 330. The front end of the, is provided with a push-up inclined surface 333 having a normal toward the front top, the push-up slope 333 may include a curved surface.

Correspondingly, a tip lower slope surface 232 may be provided at a lower portion of the front end of the latch 200 in contact with the pushing slope 333 with a normal line toward the rear lower portion. In addition, an upper inclined surface 221 of a downwardly inclined shape may be provided at an upper end of the latch 200 as it moves away from the door.

In front of the latch holder 10 is provided a latch entry and exit 110 which is a passage through which the latch 200 enters or exits the hook receiving space 180.

If the latch 200 is lifted upward by the lever and pushed out of the latch holder, the upper surface of the latch 200 is latched in and out because the interference occurs in the opening direction of the door and the opening of the door is prevented to some extent. Even if a situation occurs in which the upper surface of the ball 110 is no longer moved upwards, the lever 300 continues to push the latch 200 forward while lifting the latch 200 to continue the latch 200. In a state where the upper surface of the upper surface is in contact with the ceiling surface, the latch 200 eventually slides in the direction in which the door is opened, thereby allowing the door to be pushed out.

That is, the upper inclined surface 221 provided at the upper end of the latch 200 is opened after contacting the upper wall surface 113, which is the ceiling surface of the latch entrance and exit hole 110, in a state in which the latch 200 is lifted by the lever. By sliding in the direction, the force that the lever 300 pushes the latch 200 is smoothly transmitted to the door.

After the latch 200 is released by the lever 300 and is pushed in the opening direction, the latch 200 is elastically provided with a latch entry and exit hole 110 provided in front of the latch holder 10. It is seated on the outer inclined surface 111 provided at the bottom of. Since the outer inclined surface 111 has a form inclined downward toward the door from the main body, the latch 200 does not interfere with the opening of the door in the process of opening the door, and rather the force that the latch 200 descends is the outer diameter. Interact with slope 111 to push the door further outward.

The latch holder for implementing the above-described door opening mechanism, the holder body 100 forming the overall frame of the latch holder; A latch entrance and exit hole 110 provided in front of the holder body 100 and serving as a passage through which the latch 200 enters and exits; An outer inclined surface 111 provided below the latch entrance and exit hole 110 and inclined downward toward the front; And an upper wall surface 113 provided at an upper portion of the latch entrance and exit hole 110. A lever support part 120 spaced apart from the rear of the latch entrance and exit hole 110; A hook receiving space 180 provided between the latch entrance and exit hole 110 and the lever support part 120; A lever 300 rotatably supported by the lever support part 120 and provided with a push part 330 provided at a front end thereof at a lower portion of the hook accommodation space 180; A pusher 500 for rotating the lever support 120 to lift the lever 300; And a pusher driver 600 for driving the pusher 500.

The push unit 330 includes an interpolation member 331 provided at the tip of the lever 300, and an extrapolation member 332 extrapolated to the interpolation member 331, wherein the extrapolation member 332 is the Sliding with the latch 200 to push the latch 200 in the opening direction of the door (720). Thus, the extrapolation member 332 and the other lever 300 can be made of different materials, so that it is possible to selectively configure a material suitable for the performance that each configuration should exhibit.

The extrapolation member 332 preferably includes a resin-based material having a lubricity surface having a higher wear resistance and a lower friction coefficient than the interpolation member 331.

The front surface of the lever support portion 120 is provided with a shielding surface portion 123 for shielding the inside of the latch holder from the outside through the latch inlet and outlet 110 from the outside, so that the inside of the latch holder from the outside to look neat appearance To provide.

The lever 300 is supported by the second lever support shaft portion 122 provided on the second side surface of the lever support portion 120, and is rotatably installed adjacent to the second side surface of the lever support portion 120. . The lever 300 includes a shaft portion 310 hinged to the lever support portion 120, and an acting portion 320 extending forward from the shaft portion 310.

The lever 300 may be disposed bypassing the shielding surface portion 123, and thus the push portion 330 extends from the distal end portion of the acting portion 320 to the first side to extend the hook receiving space 180. It can be accommodated at the bottom of the.

The shielding surface portion 123 is arranged to be offset laterally with respect to the lever entry and exit hole 110, even if the push portion 330 is installed beyond the shielding surface portion 123, the push portion 330 of the lever 300 The degree of eccentricity laterally from the acting portion 320 can be minimized.

The push unit 330 may include: a top surface 334, a bottom surface 335 disposed below the top surface 334 and extending further forward than the top surface 334, and a front end and a bottom surface of the top surface 334 ( It is provided on the push-up inclined surface 333 and the lower end of the push-up inclined surface 333 so that the front end of the 335 is inclined, and further includes a push-up portion 336 protruding forward from the push portion 330. .

As the lever 300 is rotated and the push part 330 is lifted up, the latch 200 accommodated in the hook accommodation space 180 is connected to the upper surface 334 and the lifting slope 333. Starting near the boundary, it slides up to the lower end of the pushing slope 333 and is lifted up by the force from the lever 300.

The push part 330 is disposed below the center of rotation of the lever 300, and as the lever 300 rotates, the pusher 336 has a height equal to or greater than the center of rotation of the lever 300. Is raised to a height. Accordingly, the push unit 330 pushes the lever 300 upward and outward.

The lever 300 further includes a force point portion 340 extending from the center of rotation of the lever 300 and receiving a force for rotating the lever 300 at a position spaced apart from the center of rotation. The point part 340 and the holder body 100 are connected by a return spring 630 which adds the force point part 340 in the direction in which the push part 330 descends.

An open detection switch 400 is installed below the hook receiving space 180 to detect a closed state of the door, and the trigger 420 of the open detection switch 400 is disposed below the push part 330. However, in the state that the latch is not inserted into the hook receiving space 180, the push unit 330 lowered by the return spring 630 does not press the trigger 420, so that the push unit 330 alone By pressing the open detection switch 400 to prevent the cooker from malfunctioning.

The force point portion 340 is pressed by the pusher 500 in a direction opposite to the biasing direction of the return spring. Therefore, when the pusher 500 presses the force point 340, the force overcomes the restoring force of the return spring and moves the force point 340. Accordingly, the lever 300 rotates and the push unit 330 latches. (200) will be lifted. When the pusher 500 returns, the lever 300 returns to its original position by the return spring.

The pusher 500 includes: a rotating plate 520 rotated by a motor 610; It is provided in a position eccentric from the rotation center of the rotary plate 520 by rotating as the rotary plate 520, by pressing or pushing the force point 340, the pusher cam 540; includes. Accordingly, the pusher cam 540 presses or releases the lever according to the displacement of the rotating plate 520.

The rotary plate, provided in the position eccentric from the rotation center of the rotary plate 520, even if the rotary plate 520 is rotated as the rotary projection 530 is provided in a position that does not meet the lever 300 is further And a trigger 622 that is pressed when the pusher 520 rotates and the pusher 530 is positioned at a predetermined position, and is not pressed at a position outside the predetermined position near the pusher 500. The return stop switch 620 is provided to control the rotation and the stop point of the rotating plate 520.

For example, when the trigger 622 of the return stop switch 620 is pressed, the pusher driver 600 driving the pusher 500 is stopped, so that the operation of the pusher can be accurately controlled.

On the other hand, the automatic opening door operation control method of the present invention for solving the above problems can be applied to the main body 710 having a cooking chamber therein, and the automatic opening structure of the cooking apparatus described above.

In the automatic opening door operation control method of the present invention, when the power is supplied to the cooker or the user turns on the cooker, the lever 300, the pusher 500 and the pusher drive unit 600 is aligned in the correct position. To execute the control.

For example, the pusher 500 connected to the motor 610 allows the pusher to be aligned in a state in which the pusher presses the return stop switch 620, that is, the return stop switch is turned on. When the door opening operation is performed, the motor 610 moves the pusher 500, and then the pusher 500 moves to the position where the return stop switch is pressed again.

When the cooking appliance is initially started (starting supply of power, pressing a power button, etc.), the pusher 500 may not be positioned at a proper position. According to the present invention, in order to align the pusher 500 so that the pusher 500 is in the correct position, the motor 610 when the pusher 500 is positioned at a position where the return stop switch is not turned on when the cooker is started. Power is supplied to the pusher 500 to rotate the motor 610 until the push stop switch. When the motor 610 is rotated and the pusher 500 presses the return stop switch, power supplied to the motor is cut off.

The power supplied to the motor may use power supplied to the cooking appliance, that is, AC power. The power is supplied in a continuous form, not in a pulsed form or an intermittent form.

In applying the motor driving method of supplying power in a continuous form to the motor of the latch holder, the above initial position alignment is very meaningful drive control.

According to the latch holder driving principle of the present invention, accurate positioning and alignment of the pusher 500 is required for automatic opening control of the door. To this end, in the control method of the present invention, by continuously monitoring the period of power supply to the motor, the on-off state of the return stop switch, and the on-off state of the open detection switch, it is possible to accurately control the automatic opening operation of the door. have. In addition, according to the present invention, even if there is no separate sensor for checking whether the motor is actually rotating, it is possible to control the position of the pusher and the automatic opening control of the door.

In the latch holder described above, when the latch 200 is accommodated in the latch holder 10 and is in a locked state, the pusher 500 returns stop by a force that the hook portion 230 of the latch presses the lever 300. The switch 620 moves in conjunction with the pushing position.

Thus, if the door is closed correctly, the pusher 500 in the latch holder 10 will maintain the initial home position.

At the initial start of the cooker, the door may be closed or open, and even if the door is open, the pusher 500 may not be in the correct position and may be out of the position where the return stop switch is pressed due to a power failure or the like. have.

Accordingly, the present invention controls the alignment of the pusher 500 at the initial startup of the cooking appliance. To this end, the automatic door opening control method of the present invention includes a first step of checking whether the return stop switch 620 is turned on when the cooker is turned on; A second step of supplying power to the motor when the return stop switch 620 is off in the first step; A third step of supplying power to the motor in a second step and checking whether the return stop switch 620 is on after a predetermined time t ₀ elapses; And step 4-1 to return to the first step when it is confirmed in step 3 that the return stop switch 620 is switched to the on state.

When the above control algorithm is applied, it is possible to align the pusher 500 in the right position at the initial start time of the cooking appliance.

On the other hand, in the third step, it is confirmed that the return stop switch 620 is kept in the off state without being switched to the on state. In this case, it may be determined that there is an error in the return stop switch or the motor. Accordingly, the method may further include generating a fourth error signal for notifying the failure of the return stop switch or the motor and stopping the cooking appliance.

Of course, when it is confirmed in the first step that the return stop switch 620 is in the on state, since the pusher 500 is already at the correct position, the position alignment control of the pusher 500 is not necessary. Rather, even if the pusher 500 is in the correct position, such alignment may result in the door being opened.

According to the latch holder of the present invention, when the door is closed, the pusher is expected to be in the correct position by the interlocking structure of the lever and the pusher, and when it is confirmed that the return stop switch is pressed when the cooker is initially started, You do not need to sort.

When the initial exact position alignment of the pusher 500 is made as described above, the controller maintains the standby state until the user inputs a door opening command. Of course, as described above, after the cooking appliance is started, the controller continuously monitors the on / off state of the return stop switch and the open detection switch, and whether the motor is supplied with power.

When the procedure for controlling the position of the pusher 500 is in progress, it is confirmed that the pusher 500 has been in the initial position from the beginning, and thus the position of the pusher 500 is not controlled. When the user enters the fifth step of waiting for the user to input the door open command, and enters the user's door open command, the controller enters control for the automatic door opening operation.

To this end, when the user's door open command is input in step 5, the present invention goes through a sixth step of supplying power to the motor and checking whether the return stop switch is turned off.

If it is confirmed in step 6 that the return stop switch is turned off, it can be confirmed that the motor is operating normally. At this time, after a predetermined time elapses, a seventh step of checking whether the open detection switch is turned off is performed.

If it is confirmed in the seventh step that the open detection switch is turned off, it can be confirmed that the lever pushes the latch normally, the latch is released from the latch holder. In this case, an eighth step is performed to check whether the return stop switch is turned on.

If it is confirmed in step 8 that the return stop switch is turned on, it can be confirmed that the return stop switch is operating normally. In this case, the process goes through the step 9-1 to return to the first step.

As described above, the sixth, seventh, eighth, and ninth-first steps include the normal operation of the motor and the door through the monitoring signals (return stop switch signal, open detection switch signal, power supply period of the motor). This is a step that can be performed when both the normal opening operation (unlocking the latch) and the normal operation of the return stop switch are confirmed.

When the return stop switch is turned off in the sixth step, the motor may be determined to be normal because the motor is moved when the power is supplied to the motor, but the return stop switch is not turned off. In the case of maintaining the on state, it may be determined that the motor does not move even when the power is supplied to the motor, thereby determining that the motor is abnormal.

In addition, in the sixth step, the return stop switch is turned off, but the return stop switch is turned on even after a predetermined time (a time when the operation of the pusher is performed by the motor and the pusher can return to the home position). If the motor is operating normally and the return stop switch detects this, it can be confirmed that the motor and the return stop switch are in normal operation, and the door cannot be released from the latch holder. It can be determined that there is an error in the latch operation.

After the return stop switch is turned off in the sixth step, even if the open detection switch is turned off, a predetermined time (a time at which the pusher is operated by the motor and the pusher can return to the home position) If the return stop switch remains off even after), the motor is running smoothly and the latch is normally released from the latch holder, but it is determined that the return stop switch has not detected the home position pusher. It may be determined that there is an error in the return stop switch.

In addition, in the sixth step, even if the return stop switch is kept in the off state without being turned off, when the open detection switch is turned off after a predetermined time, the motor moves normally, and accordingly the latch is released. Although the pusher is in a position where the pusher does not press the return stop switch because the motor and the pusher are normally moved, it may be determined that the return stop switch has not detected this, and thus it may be determined that the return stop switch has an error.

The algorithm and sequence will be described in more detail as follows.

After the power is supplied to the motor according to the user's open command input and the return stop switch is turned off, after confirming that the open detection switch is turned off after a predetermined time, the return stop is performed in the eighth step. When the switch is not turned on and maintains the off state, it may be determined that the return stop switch is abnormal, and after generating a second error signal informing of this, the operation of the cooking appliance may be terminated.

Then, after the power is supplied to the motor according to the user's open command input and the return stop switch is turned off, the open detection switch is still not turned off even after a predetermined time. In this case, the operation of the cooker may be terminated after determining that there is an abnormality in the latch operation and generating a first error signal informing of this.

In addition, when it is confirmed that power is supplied to the motor according to the user's open command input and the return stop switch is kept in the on state without being turned off, there may be an error in the motor or the return stop switch. Therefore, an error signal can be generated.

It is determined in the following order whether there is an abnormality in the motor or the return stop switch. This determination is made after the predetermined time (the time that the motor can rotate to operate the pusher and thus the lever can push the latch out of the latch holder if the motor is operating normally) and then the door is closed and on. It is possible to proceed by checking whether the open detection switch was turned off.

To this end, the present invention is the door is closed when the power supply to the motor in the sixth step when the open detection switch was in the on state, after a predetermined time elapses whether the open detection switch is switched to the off state Prepare a 12th step to verify.

When it is confirmed in the twelfth step that the open detection switch is turned off, the motor may be confirmed to be normal and there is an error in the return detection switch, thereby generating a second error signal informing of an abnormality of the return monitoring switch. Step 13-1 may be performed.

On the other hand, when it is confirmed in the twelfth step that the open detection switch is maintained in the on state without being switched off, it may be determined that the motor is abnormal, thereby generating a third error signal informing the motor of an abnormality. Step 13-2 may be performed.

Of course, when judging whether there is an error in the motor or the return stop switch as described above, it is referred to whether the door is closed and normally opens. Therefore, if the open monitoring switch is already turned off when the power is supplied to the motor (the door is open). ), It is difficult to check whether there is an error between the motor and the return stop switch. In this case, a fourth error signal indicating that there is an error in any one of the motor and the return stop switch may be generated.

According to the cooking apparatus of the present invention, a structure for automatically opening a door in which a pair of latches behaving independently of each other may be easily implemented by simply installing and driving a lever applied to any one latch holder. Accordingly, the door can be automatically opened without the pair of latches interlocking and without the openings of the two latches. Therefore, the design of the door is simple and the cavity space of the cooking appliance can be further secured.

In addition, the present invention is to amplify the door opening force by using the lever, it is sufficient to initially open the door only to the position that the door opens by itself due to its own weight, it is possible to implement a structure that automatically opens the door with a low-power drive unit. .

Also, since the drive system itself is light, when the latch is accommodated in the latch holder by closing the door, the lever and the pusher are rearranged to the right position by the force of the latch pushing the lever even if the lever and the pusher are slightly displaced from the home position. As a result, the door closing operation may also be performed smoothly.

In addition, the automatic opening structure of the present invention is installed in a position that is not affected by the hot environment of the cooking chamber, as well as its components are not exposed to the outside, there is no fear of malfunction and can provide a clean appearance.

Next, according to the method for automatically opening the door of the cooking appliance according to the present invention, there is no need to generate other types of power in addition to the normal continuous AC power supplied to the cooking appliance and supply the power to the motor, It is possible to monitor an error or an abnormality of each component of the automatic door opening device only by a signal of the return stop switch, which is a component for determining the stop position of the motor, and an open detection switch, which is a component for checking whether the door is open. That is, the automatic opening operation can be accurately controlled without a separate sensor for checking whether the motor is operating or a separate sensor for checking whether the latch is properly maintained in the latch holder.

In addition, according to the present invention, without the operation of separately checking the error of the automatic opening operation of the door, by continuously monitoring the signal of the power supplied to the motor and the return stop switch and the opening detection switch during the automatic opening operation of the door In real time, it is possible to check the malfunction of the automatic door opening structure.

In addition, according to the door automatic opening control method of the present invention, in addition to the conventional latch holder, without adding a separate sensor or a separate control means, simply by adding a motor and a pusher (cam), a lever and a return stop switch, The automatic opening of the door can be controlled accurately.

1 is a perspective view of a latch holder to which the automatic opening structure of the cooking appliance according to the present invention is applied.
FIG. 2 is an exploded perspective view of the latch holder of FIG. 1. FIG.
3 is a perspective view of a holder body of the latch holder of FIG. 2.
4 is an enlarged view of an axial part, an acting part, and a push part of the lever of the latch holder of FIG. 2.
FIG. 5 is a side view of FIG. 1 and illustrates a latch holder in a latch (not shown) state.
6 is a view illustrating a state in which the pusher of FIG. 5 pushes the lever so that the bushing portion of the lever is lifted.
7 is a view illustrating a state in which the pusher and the lever are returned to their initial positions in a state where the latch is removed.
8 is a side view illustrating a state in which a latch is inserted and fixed to the latch holder by closing the front of the cavity of the cooker with a door in the cooker provided with the latch holder.
FIG. 9 is a view illustrating a process in which the pusher pushes the lever in FIG. 8 to lift the latch of the pushing slope of the push part of the lever.
FIG. 10 is a view illustrating a process of lifting the latch in FIG. 9 to further push the latch out of the lever.
FIG. 11 is a view showing a state in which the latch is pushed down and then lowered and seated on an external inclined surface.
FIG. 12 is a view illustrating a process in which a door is opened by its own weight after the latch is released as illustrated in FIG. 11.
FIG. 13 is a perspective view illustrating a door hinge structure that may be used to automatically open and lower the door by the weight of the door as shown in FIG. 12.
FIG. 14 is a side view illustrating the door hinge structure of FIG. 13. FIG.
15 is a view showing the geometry of the lever of the present invention.
16 is a flowchart illustrating an overall control method of the automatic opening structure of the cooking appliance according to the present invention.
FIG. 17 is a flowchart separately illustrating only an error signal generation step in FIG. 16.
FIG. 18 is a flowchart illustrating a control process of initializing a motor and a pusher to a correct position when the cooking appliance is initially started in FIG. 16.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, only this embodiment to complete the disclosure of the present invention and to those skilled in the art to the full extent of the invention It is provided to inform you.

[Overall Structure of Cooking Equipment]

Hereinafter, the overall structure of the cooking appliance to which the automatic door opening control method according to the present invention is applied will be described first.

Referring to FIG. 14, a cooking appliance is illustrated as an example of the present invention. However, it will be apparent that the cooking appliance of the present invention is not limited to a microwave oven.

The cooking apparatus includes a main body 710 having an approximately rectangular parallelepiped shape and having an open front and an empty inside, and a door 720 installed in front of the main body 710.

The main body 710 includes an outer housing that forms the overall appearance of the cooking appliance, and an inner housing provided in the outer housing and provided with a cavity opened forward. The cavity constitutes a cooking chamber. Various parts necessary for the operation of the cooking appliance are provided at the top, the rear, and the side of the main body 710.

The door 720 has a pull-down opening and closing structure having a horizontal hinge axis 814 (see FIGS. 13 and 14) at a lower end of the door. That is, the door 720 is rotated to the front lower portion with respect to the main body to open, and rotates to the rear upper portion is closed.

The area of the door 720 may be an area that merely opens or closes the front of the cooking compartment, but may also be an area that covers both the cooking compartment and the front of the upper space of the cooking compartment as shown. In this case, a control unit such as a display and a touch panel may be installed on the front surface of the door 720 corresponding to the upper space of the cooking chamber.

The upper side of the main body 710 is provided with a latch holder 10 to maintain the door 720 is closed, the door is automatically opened. In addition, the door 720 is provided with a latch 200 that is caught by the latch holder 10 to maintain the door closed or is released from the latch holder 10 to open the door.

The latch is installed to protrude rearward from the upper ends of the doors. The latch holder 10 of the main body 710 is disposed above both front ends of the main body corresponding to the position where the latch is installed. The latch holder 10 is open to the front has a latch entry and exit hole 110 through which the latch can enter.

The latch holder 10 for automatically releasing the latch may be provided in correspondence with either of the latches, and the other side may be provided with a conventional latch holder having no automatic release function. have. The two latches are mounted on the doors to behave independently of each other. The two latches may be elastically supported in the door so that the hook portion of the leading end is downward, and the elastic force acting on the two latches may be the same.

13 and 14, a hinge module 800 provided with a spring 823 and a damper 850 is connected to the front lower portion of the main body and the lower portion of the door. The spring 823 urges the door in a direction in which the door 720 rotates upward rearward, that is, in a direction of closing the door. Accordingly, the spring 823 prevents the door from being opened hard when the door is opened and lowered.

In addition, damper 850 attenuates the rotational force of the door when the door is opened to allow the door to open slowly. If necessary, the damper 850 may provide a damping force only when the door is opened, or may provide a damping force in both the opening and closing directions of the door. In addition, the damping force may be provided in all rotation angle sections in which the door is opened and closed, or the damping force may be provided in some sections of the rotation angle range.

The damper 850 may attenuate the opening force of the door in a predetermined opening angle section of the door, and may not provide a damping force in a section outside the opening angle. In the present invention, a structure in which the damper 850 operates in a section corresponding to a2 and a3 of FIG. 12 is illustrated. The damping intrusion angle a2 at which the attenuation starts as the door is opened may be 35 ± 5 ° (see FIG. 12).

[Latch holder]

Hereinafter, a latch holder which is an automatic door opening device of a cooking appliance to which the automatic door opening control method of the present invention is applied will be described with reference to FIGS. 1 to 7.

The latch holder of the present invention is a holder body 100 for supporting the overall structure, the latch entrance and exit hole 110 provided in front of the holder body 100, the lever 300 installed in the holder body 100, the open detection switch 400, a pusher 500, and a pusher driver 600.

The latch 200 of the door 720 is pulled in and out from the front of the latch holder through the latch entry and exit hole 110. Inside the latch entrance and exit hole 110 is provided with a hook receiving space 180 for receiving the hook of the latch. An opening detecting switch 400 is installed below the hook accommodation space to detect whether the hook is accommodated in the aircraft hook accommodation space 180 to maintain a locked state.

The rear of the hook receiving space 180 is provided with a lever support portion 120 in which the lever 300 is rotatably installed. The lever 300 includes an acting portion 320 extending forward from the lever supporting portion 120 and a push portion 330 extending from the tip of the acting portion 320 to the hook receiving space 180. And a force point portion 340 extending upward from the support portion 120 and extending upward.

An opening detecting switch 400 is installed below the hook receiving space 180. The open detection switch 400 includes a trigger 420 disposed below the push part 330. The trigger 420 is pressed in contact with the push unit 330, but the force for pressing the trigger 420 is provided by the latch 200 accommodated in the hook accommodation space 180.

A pusher 500 for pushing the force point 340 of the lever 300 to the rear and a pusher driver 600 for providing a driving force of the pusher 500 are installed above the lever support 120. The motor 610 of the pusher driver 600 is fixed to the second side of the holder body 100, and the pusher 500 is disposed on the first side of the holder body 100 and rotated by the motor 610. do. The rotational displacement of the motor 610 is controlled by the return stop switch 620. This control is performed by an operation of pressing the trigger 622 of the return stop switch 620 by the push protrusion 530 installed in the pusher according to the rotation angle displacement of the pusher 500.

The force point portion 340 of the lever 300 is connected to the holder body 100 through the return spring 630 and receives a force applied forward by the return spring 630. Hereinafter, each configuration of the latch holder according to the present invention will be described in more detail.

[Holder Body]

Holder body 100 for supporting the overall structure of the latch holder according to the present invention, the base surface 101 including a plane extending in the vertical direction and the longitudinal direction, that is, a plane having a normal to the first side and the second side It includes.

The front and lower portions of the holder body 100 are provided with latch entrance and exit holes 110 that are opened forward. The latch entry and exit hole 110 is a path from which the latch 200 enters into the holder body 100 or the latch exits from the holder body 100 forward.

The latch entrance and exit hole 110, the outer inclined surface 111 defines the boundary at the lower side, the upper wall surface 113 defines the boundary at the upper side, the side wall surface 114 on both sides thereof Define boundaries.

Under the latch entrance hole 110, the outer inclined surface 111 of the form inclined upward from the front to the rear is provided. When the latch 200 enters the holder body 100, the tip lower slope surface 232 of the hook portion 230 of the latch 200 rises on the outer slope surface 111.

The inner end surface 112 is provided at the rear end portion of the outer slope surface 111. The inner inclined surface 112 is an upper sloped form from the rear to the front. A substantial portion of the inner slope 112 and the upper end of the outer slope 111 are interconnected by a smooth curved surface.

The inner inclined surface 112 is in contact with the rear inclined surface 231 of the hook portion 230 of the latch 200 entered into the holder body 100 and prevents the latch 200 from being separated from the front. On the other hand, the internal inclined surface 112 provides an inclined surface that allows the rear inclined surface 231 of the latch 200 to naturally slide up when the user pulls the door forward to open the door. . The back sloped surface 231 may be a flat surface or a curved surface that is slightly convex. That is, according to the present invention, the user can open the door manually.

The upper wall surface 113 includes a horizontal ceiling surface provided on the upper portion of the latch entrance and exit hole 110. When the lever 300 pushes the latch 200 to automatically open the door, the upper wall surface 113 is the upper surface of the latch 200, more specifically the upper sloped surface 221 of the latch 200. The upper inclined surface 221 is guided to slide forward.

The upper wall surface 113 and the outer slope surface 111 are connected to the first side and the second side by the side wall surface 114 vertically. The spacing between the two sidewalls 114 is wider than the width of the latch 200 and thus does not interfere with the latch 200.

The rear of the latch entry and exit 110 is provided with a shielding surface portion 123 that shields the inside from being seen through the latch entry and exit 110 when viewed from the front to the rear. The shielding surface portion 123 includes a flat plate shape having a normal line in the front-rear direction. The hook portion 230 of the latch 200 is accommodated in the hook accommodating space 180 provided by the shielding surface portion 123 spaced backward from the latch entry and exit hole 110.

The shielding surface portion is perpendicular to the base surface 101 and connected to the base surface 101 to thereby reinforce the overall rigidity of the holder body 100. Behind the shielding surface portion, a lever support portion 120 for rotatably supporting the lever 300 is provided. The lever 300 is a component that operates to release the latch state of the latch 200 is fixed to the holder body (100).

The lever support 120 needs some rigidity to support the lever, and this rigidity is met to some extent by the shielding surface 123.

Since the shielding surface portion 123 blocks the latch entry and exit hole 110, the lever 300 installed in the lever support portion 120 is disposed at a position to avoid the shielding surface portion 123 and the lever support portion 120. . The lever support part 120 extends from the base surface 101 and is provided on the extension member 121 connected to the shielding surface part 123 and the extension member 121 to rotate the lever 300. It has a lever support shaft portion 122 for supporting it. The lever 300 is pivotally coupled to the lever support shaft portion 122 and is rotated to be in contact with the second side surface of the extension member 121.

A tip portion of the lever 300 includes a push portion 300 extending from the tip portion of the lever 300 to the first side, and the push portion 300 includes the shielding surface portion 123 and the latch entry / exit hole 110. It is located in the hook receiving space 180 provided between.

The shielding surface portion 123 may be disposed in a form slightly offset to the first side with respect to the lever access hole 110. This is to minimize the eccentricity to the side between the push portion 330 and the force point 340 of the lever 300 acting force.

The lower part of the latch entrance and exit hole 110 and the lever support part 120 is provided with an open detection switch fixing part 150 to which an open detection switch 400 for detecting a closed state of the door is fixed. The open detection switch fixing part 150 includes a flat part having a normal to the side, and connects the lower part of the latch entrance and exit hole 110 and the lower part of the lever support part 120 to each other.

 The open detecting switch fixing part 150 includes a fixing wall 151 for supporting the switch body 410 of the opening detecting switch 400, and at least a part of the fixing wall 151 is the lever support part ( 120).

In a state where the switch body 410 is installed in the opening detecting switch fixing unit 150, the trigger 420 of the opening detecting switch 400 protrudes upward toward the hook receiving space 180. The lever 300 has a trajectory for pressing the trigger 420.

The holder body 100 further includes a structure for supporting the pusher 500 and the pusher driver 600 for driving the lever 300.

The holder body 100 is provided with a pusher 500 for pushing the lever 300 to rotate the lever 300 in the direction of opening the latch 200. To this end, the base surface 101, a pusher support 130 for supporting the pusher 500 is provided. The pusher support unit 130 includes a hole 131 into which the rotation shaft 510 of the pusher 500 is inserted, and supports the first side surface of the pusher 500 that supports the rotating plate 520 of the pusher 500. Include. The first side surface contacts the push protrusion 530 provided on the second side surface of the rotating plate 520 to support the rotating plate 520.

On the base surface 101 on the opposite side (second side surface) of the surface on which the pusher 500 is installed (first side surface), a pusher driving portion fixing the pusher driving unit 600 for driving the pusher 500. Government 170. The pusher driver 600 may be a rotary motor 610, and the housing of the motor 610 may be fixed to the second side surface of the base surface 101.

On the base surface 101 of the holder body (100). A return stop switch fixing part 160 is provided to fix the return stop switch 620. The return stop switch 620 includes a trigger 622 which is pressed by the pusher 530 of the pusher 500. The trigger 622 is pushed by the pusher 530 at the position where the pusher 500 should return after pushing the lever 300, thereby stopping the rotational driving of the motor 610. Therefore, the return stop switch 620 is installed at the position where the trigger 622 is pressed by the pusher 530 at the return position of the pusher 500. The return stop switch fixing unit 160 may be provided on the pusher support unit 130.

In addition, in order to provide a force to return to the original position after the lever 300 pushes the latch 200, the holder body 100 is provided with a return spring support 140. The return spring supporter 140 is disposed closer to the lever supporter 120 than the pusher supporter 130. The return spring supporter 140 may include a hook hanger 141 for hanging a ring provided at one end of the return spring 630.

[lever]

The lever 300 is fixed to the lever support portion 120 so that the shaft portion 310 is fastened to the lever support shaft portion 122 of the holder body 100. The lever support shaft portion 122 may include a shaft shape extending in the second side, and the shaft portion 310 may have a hole shape for receiving the shaft shape. On the contrary, the lever support shaft portion 122 may have a hole shape, and the shaft portion 310 may have a shaft shape.

The lever 300 includes an acting portion 320 extending forward from the shaft portion 310. The front end of the acting portion 320 is provided with a push portion 330 extending in the first side. With the lever 300 installed in the holder body 100, the push part 330 is disposed in the hook receiving space 180 of the holder body 100.

Since the lever 300 transmits a force for pushing the latch 200, the lever 300 is made of a material having a relatively rigidity, and the push part 330 is a part in sliding contact with the latch 200, and thus has high wear resistance and a coefficient of friction. It is desirable to be made of a low material. The lever 300 may be a metal material such as aluminum alloy.

The push unit 330 is made of the same material as the overall material of the lever 300, or the interpolation member 331 and integrally produced with the lever 300, and the extrapolation member extrapolated to the interpolation member 331 ( 332). The interpolation member 331 secures the rigidity of the push unit 330, and the extrapolation member 332 may be made of a material having a low friction coefficient and high wear resistance to make sliding contact with the latch 200. In particular, the push unit 330 is in sliding contact with the latch 200, the push unit 336 is operated to reliably push the front end surface (232, 233) of the latch 200, the extrapolation member (332) is made of a material with high surface hardness, high wear resistance, low coefficient of friction, and lubrication, thereby further increasing the reliability of operation.

The interpolation member 331 may be integrally formed with a metal material such as an aluminum alloy together with the lever 300. On the other hand, the extrapolation member 332 may be made of a resin material. The resin-based material has a high surface hardness and is excellent in elastic deformation and restoring action as compared with a metal material, so that the resin-based material is elastically deformed and restored by a force applied to the extrapolation member 332 by a latch. Even if this is repeated, there is much less risk of surface breakage. Therefore, the extrapolation member is not damaged while sliding with the latch, it can further exert the effect of pushing the latch through the elastic deformation and restoration.

On the other hand, when the interpolation member 331 is in direct contact with the latch, there is a fear that permanent damage may occur on either surface due to contact between the metal materials, which may cause a large frictional force to expand the damaged part. In addition, since the elastic restoring force such as the degree of the resin material can not be expected, there is a fear that the opening operation of the latch is not performed smoothly.

The push unit 330 may have a cross-section of a substantially trapezoidal shape when viewed from the side. The bottom surface 335 of the push unit 330 is a pressing surface for pressing the trigger 420 of the open detection switch 400 provided below the push unit 330. The upper surface 334 of the push portion 330 is a surface on which the hook portion 230 of the latch 200 accommodated in the hook accommodation space 180 is placed. That is, the latch 200 presses the push part 330 downward on the upper surface of the push part 330, and the push part 330 presses the trigger 420 by the force of the latch.

Since the upward force that the trigger 420 has on the switch body 410 is greater than the load of the push unit 330, in the state where only the push unit 330 is placed on the trigger 420 without the latch 200. The push unit 330 does not push down the trigger 420 but is slightly raised on the trigger 420.

Push portion 330 is provided with a push-up inclined surface 333 on the front surface. The push-up inclined surface 333 has a lower end portion projecting more forward than the upper end portion, and is inclined backward from the lower end portion toward the upper end portion. The pushing inclined surface 333 has a slightly convex curved profile and is in surface sliding contact with the tip lower inclined surface 232 of the latch 200 and transmits the force of the lever 300 to the latch 200. The lower end of the lifting slope 333 constitutes a pushing part 336 that pushes the front end of the latch 200 to the end.

The lever 300 further includes a force point portion 340 extending rearward with respect to the shaft portion 310. The distance between the force point of the shaft portion 310 and the force point 340, rather than the distance between the shaft portion 310 and the push portion 330, to amplify the force by which the push portion 330 lifts and pushes the latch. Is set farther away. According to this structure, the pusher driver 600 may be configured to have a lower power and a lighter weight.

In order to manufacture the latch holder more compactly, the force point portion 340 may be manufactured in an approximately "L" shape, and the force point may be provided near the upper end of the force point portion 340. The force point 340 is subjected to a force by the pusher 500, the force is transmitted to the push unit 330.

When the pusher 500 returns to the force point part 340 after applying force to the force point part 340, one end of the return spring 630 for returning the lever 300 to its original position is connected. Government 342. The spring fixing part 342 is disposed closer to the shaft portion 310 than the force point of the force point portion 340. Unlike when the lever 300 pushes the latch 200, a strong return force is not necessary when the lever 300 returns to the initial position after pushing the latch. Accordingly, the spring fixing part 342 may be disposed closer to the shaft 310 than to the force point of the pusher 500. The spring fixing part 342 may include a hook hook shape for hanging a ring provided at the other end of the return spring 630.

Preferably, the return spring 630 provides only the force of the lever 300 to the original position. That is, the return spring 630 does not continuously add the lever 300 returned to the original position, so that the push part 330 of the lever 300 alone triggers 420 of the open detection switch 400. You can avoid pressing).

The lever 300 includes a first surface facing a first side and a second surface facing a second side, the first surface of which is the second of the lever support part 120 facing the second side. It is supported in contact with the surface.

[Pusher]

The pusher 500 is a component for pushing the force point of the lever 300, is installed in the holder body (100). The pusher 500 is disposed adjacent to the force point 340 of the lever 300. The pusher 500 has a planar rotary plate 520 having a normal to the first side, and a rotating shaft 510 provided at the center of the rotary plate 520 on the second side (surface facing the second side) of the rotary plate. And a pressing protrusion 530 provided at a position eccentric from the center of the rotating plate at the second side surface, and from a center of the rotating plate 520 at the first side surface (surface facing the first side) of the rotating plate 520. It includes a pusher cam 540 provided in an eccentric position.

The rotating plate 520 has a flat disk shape as a whole, and the force point portion 340 of the lever 300 is disposed to face the first side surface of the rotating plate 520.

The rotation shaft 510 extends toward the second side. That is, the rotation shaft 510 is a rotation center of the rotation plate 520 disposed to extend laterally. The front end of the rotating shaft 510 (the end far from the rotating plate) is inserted into the hole 131 of the holder body and is rotatably supported. In addition, the rotation shaft 510 is fixed to the shaft by a rotation drive shaft 611 of the motor 610 provided on the opposite side of the rotating plate 520 with the holder body 100 therebetween.

The pressing protrusion 530 is connected to the base end (end portion close to the rotating plate) of the rotating shaft 510 and is provided on the second side surface of the rotating plate 520. The pressing protrusion 530 is provided at any part in the circumferential direction of the rotating plate 520, and the radially outer end of the pressing protrusion 530 is provided at a position capable of pressing the trigger 622 of the return stop switch 620. do. Since the push protrusion 530 presses the trigger 622 while turning about the rotation shaft 510, a convex curved portion 531 is provided at the distal end. The curved portion 531 of the push protrusion 530 has a convex shape when viewed at least from the side, such that the trigger 622 is pressed along with the convex shape of the curved portion 531.

The curved portion 531 includes curved profiles 5311 provided on both sides, and a pressing holding profile 5312 connecting the curved profiles 5311. The pressing holding profile 5312 maintains a state in which the trigger 622 is pressed even when the rotating plate 520 is rotated by a predetermined angle (a). Even if the power supplied to the motor 610 is cut off as soon as the trigger 622 is pressed by the inertia, the rotary plate 520 is slightly rotated by the inertia of the motor 610 and the rotating plate 520 to push the protrusion 530. If is out of the trigger 622, there is a fear that the pressed state of the trigger 622 is released. The holding profile 5312 allows the pusher to hold the trigger even when the rotating plate rotates a little more due to the inertia of the motor and the rotating plate.

According to the embodiment of the present invention, the operation of rotating the rotary plate 520 once and the opening operation of the lever are linked. Therefore, the one-time rotational control of the rotating plate can be made more precisely by the pressing holding profile 5312 structure.

On the other hand, the cam structure of Patent Document 1 described above is heavy because the cam is directly connected to the driving unit, and the cam is connected with the 1/5 rotation of the lever and the upward movement of the lever. If the cam does not stop in place, there is a high probability that the door will close and the cam will not return to home even if the latch presses on the cam.

The pusher cam 540 has a cylindrical shape that protrudes from the first side of the rotating plate 520 to the first side. As the pusher 500 rotates, the outer circumferential surface of the cylinder of the pusher cam 540 pushes the force point portion 340 of the lever 300 disposed closer to the first side surface of the rotating plate 520 to the rear. .

[Pusher drive part]

The pusher driving unit 600 is fixed to the second side of the holder body 100, the motor 610 to be coupled to the rotary shaft 510 of the pusher 500 penetrating the holder body 100, the holder body It is fixed to the first side of the (100) and has a return stop switch 620 for controlling the stop of the motor 610.

The housing 612 of the motor 610 is fixed to the holder body 100, and the rotation driving shaft 611 is fixed coaxially with the rotation shaft 510 of the pusher.

When the user inputs a command to automatically open the door of the cooking appliance, power is supplied to the motor 610 so that the rotation driving shaft 611 rotates. Then, the motor 610 is rotated until the pusher 530 of the pusher presses the trigger 622 of the return stop switch 620. That is, when the trigger 622 of the return stop switch 620 is pressed by the push protrusion 530, the power supplied to the motor 610 is cut off. Accordingly, the rotary drive shaft 611 and the pusher 500 begin to rotate at the position where the push protrusion 530 presses the trigger 622, and rotates until the push protrusion 530 presses the trigger 622 again. Done. Therefore, when one push protrusion 530 is provided in the circumferential direction as in the embodiment, the pusher 500 always rotates once and stops. If the pusher 530 is provided with two equal intervals in the circumferential direction, the pusher 500 will always rotate and stop half a turn.

The return stop switch 620 is installed at a position where the switch body 621 does not interfere with the pusher from the outside of the pusher 500, and the trigger 622 may interfere with the pusher 530. Installed in the same location.

Controlling the rotation stop point of the pusher 500 with the return stop switch 620 has several advantages. First, rotation of a certain angle (one rotation in the embodiment) is physically implemented in a very simple structure. In addition, even if the pusher 500 is stopped while the power is turned off due to a power failure or the like, the pusher 500 may be moved to an initial position only by controlling to apply power to the motor 610 so that the pusher 500 rotates when the power is turned on again. Will stop exactly aligned.

[Open detection switch]

The open detection switch 400 is a switch body 410 is fixed to the fixed wall 151 of the open detection switch fixing part 150 provided in the lower portion of the hook receiving space 180, and in the switch body 410 An upwardly protruding trigger 420. The trigger 420 is elastically biased to protrude upward when no external force is applied. Therefore, when the external force that pressed the trigger 420 disappears, the trigger 420 is projected upward.

As described above, the trigger 420, the latch 200 is accommodated in the hook receiving space 180 and the latch 200 is fixed to the hook portion 230 is fixed to the inner inclined surface 112 By the pushing force of the push part 330 of the lever, it is pressed by the push part 330. On the other hand, the latch 200 does not press the push part 330 for the reason that the latch 200 is withdrawn from the latch inlet / out hole 110, and the push part 330 is lifted up on the trigger 420 by itself. In the state, the trigger 420 is not pressed by the push unit 330. That is, the upward force of the trigger 420 is weaker than the force that the latch 200 presses and is stronger than the force that the push unit 330 presses alone.

The latch 200 may be provided at both sides of the door, and a latch holder having an outer slope 111 and an inner slope 112 corresponding to a latching structure of the latch may also be opened and closed by a door in the main body of the cooker. It may be disposed on both sides of the opening of the cavity to be. Accordingly, the open detection switch 400 may also be provided in two places. Therefore, unless the triggers of the two open detection switches 400 are pressed at the same time, it may be determined that the door of the cooking appliance is open and the cooking appliance does not operate.

Of course, among the latch holders on both sides, the above-described latch automatic release structure of the present invention including a lever and a pusher may be provided on either side. Therefore, the open detection switch 400 installed in the latch holder on one side is indirectly pressed by the lever 300 when the latch 200 is received, and the open detection switch installed in the latch holder on the other side is latched when the latch is received. Can be pressed directly.

[Latch Holder Operation]

Referring to FIG. 5, in a state where the hook is accommodated in the hook accommodation space 180, that is, the door of the cooking appliance is closed, the push part 330 of the lever is pressed by the hook, and thus the push part 330 is The trigger 420 of the open detection switch 400 is pressed. In such a state, the lever 300 is rotated most clockwise about the lever support shaft 122.

When the user inputs a command for detaching the hook from the hook accommodation space 180, that is, a door opening command, the pusher 500 rotates as shown in FIG. 6. Although the direction of rotation is irrelevant, it is illustrated in the present invention that the pusher 500 rotates counterclockwise. As the pusher 500 rotates, the lever 300 is pushed by the pusher cam 540 to rotate counterclockwise about the lever support shaft 122. Accordingly, the push part 330 is lifted to the front, and the hook placed on the push part 330 will also be lifted.

When the pusher 500 is further rotated to push the force point 340 of the lever to the rear most, and then rotates to the position shown in FIG. 7 again and stops, the lever 300 is returned to the lever by the return spring 630. It rotates clockwise around the support shaft 122 and returns to its original position.

[Door unlock behavior]

Hereinafter, a process of automatically opening the door by installing the latch holder 10 having the above-described operating principle in the cooking apparatus will be described with reference to FIGS. 8 to 11.

The latch 200 used together with the latch holder 10 of the present invention, as shown in Figure 8, is installed to be rotated up and down about a horizontal pivot axis 210, the latch bar is elastically downward ( And a hook portion 230 extending downwardly from the front end of the latch bar 220.

An upper inclined surface 221 having a gentle inclined surface that is downward toward the front end is provided at an upper end of the latch 200. The upper inclined surface 221 is an upper wall surface of the latch entry hole 110 when the latch 200 is lifted by the lever 300 and receives a force forward, for example, when an unexpected obstacle occurs in the opening operation of the door. It is a surface that slides in contact with 113).

The tip of the hook portion 230 is provided with a flat tip plane 233, the lower end of the tip plane 233 is provided with a curved lower tip inclined surface 232. In addition, the rear surface side of the hook portion 230 is provided with a rear surface inclined surface 231 to be in contact with the internal inclined surface 112 of the latch entrance and exit hole 110 described above.

The latch 200 may have the same shape as the latches provided at the left and right sides of the door.

Although the lever 300 of the latch holder 10 provided on one side of the door pushes the latch 200 upward, the latch provided on the other side of the door does not rotate in conjunction with the latch of the one side. However, since the force to open the door is transmitted to the other side by the lever 300 provided on one side of the door by pushing the latch on one side, the back sloped surface of the hook portion 230 of the latch 200 provided on the other side of the door. 231 rides up the inclined surface 112 and is separated from the latch holder on the other side.

The back sloped surface 231 may also be used when the door is to be opened manually. For example, when the user pulls the door forward, the rear inclined surface 231 of the hook portion 230 of the latch provided on both sides of the door ascends the inner inclined surface 112 of the latch entrance and exit hole 110 and the latch 200. Is separated from the latch entrance and exit hole 110. The present invention provides a device that automatically releases the latch 200 from the latch entry and exit 110 by placing the lever 300, the pusher 500 and the pusher driver 600 in the latch holder 10 of the main body. However, there are many situations in which a door must be opened manually when a power failure, cooker failure, or AS occurs. Accordingly, in the present invention, the rear sloped surface 231 is formed on the hook portions 230 of both latches 200 so that the door can be manually opened, and the inner sloped surface 112 and the outer sloped surface 111 are formed on both latch holders. Prepared.

Referring to FIG. 8, the hook portion 230 of the latch 200 enters the hook receiving space 180 so that the rear sloped surface 231 is hung on the inner sloped surface 112, that is, the door is closed. It is. In the state where the door is closed, the bottom surface of the hook portion 230 is placed on the upper surface 334 of the push portion 330 of the lever 300, and the push portion 330 is openly sensed by a force pressed downward by the hook portion. The trigger 420 of the switch 400 is pressed.

The latch holders 10 are installed at both sides of the main body, and if the doors are normally closed, the open detection switches 400 of the two latch holders 10 are in a pressed state. You can see that is closed. Therefore, when the user manipulates the control panel installed in the front of the door, cooking can be started.

On the other hand, when the user inputs a command for opening the door in the control panel installed on the front of the door, the door can be automatically opened. In order for the door to open automatically, first, the latch 200 of the door is released from the latch holder 10 on one side of the main body, and together with this operation, the latch on the other side of the door is connected to the latch holder on the other side of the main body. The state should be released.

To this end, the controller rotates the motor 610. As the motor 610 rotates, as shown in FIG. 9, the pusher 500 rotates and the pusher cam 540 pushes the force point 340 of the lever 300 backward. Accordingly, the lever 300 rotates counterclockwise around the shaft 310, and the push part 330 provided in front of the lever 300 moves upward and forward. According to the present invention, since the shaft portion 310 of the lever 300 is at the rear upper portion than the push portion 330, when the lever 300 rotates, the push portion 330 rotates to the front upper portion.

At this time, since the distance between the shaft portion 310 and the force point portion 340 is longer than the distance between the shaft portion 310 and the push portion 330, the force of the motor 610 is amplified and transmitted to the push portion 330.

Since the push unit 330 revolves and rotates based on the shaft 310, the push unit 330 also rotates slightly. Accordingly, the push-up inclined surface 333 of the push unit 330 is in contact with the tip lower inclined surface 232 of the latch 200 to lift the latch 200 to the upper front. The extrapolation member 332 of the push portion 330 is preferably made of a smooth lubricity by using a material of high lubricity and wear resistance. Since the above operation is very sensitive to the trajectory of the lever and the latch, if the material of the push unit 330 is a material of high friction or low wear resistance, the latch 200 may damage the push unit 330. Rather, it could be confirmed that the push unit 330 may not lift the latch 200.

As the push unit 330 moves up and pushes the latch 200 forward, the trigger 420 of the open detection switch 400 is released.

In addition, the hook portion 230 of the latch 200 moves beyond the inner slope surface 112 toward the outer slope surface 111.

If the push portion 330 is raised, the pusher 336, which is the bottom edge of the push-up slope 333, pushes the lever 300 farthest, as shown in FIG. 200 is rotated again by elasticity.

The force of the latch 200 which rotates downward is switched to the horizontal direction on the external inclined surface 111, so that the door is further opened forward.

On the other hand, in some cases, for example, there is an obstacle in the track of the door opening, when a larger opening force is required in the direction in which the door is opened, even if the push unit 330 is raised, the latch 200 does not move smoothly forward. An action that only rises from the state may occur.

Even in this case, as shown in FIG. 10, the upper inclined surface 221 of the latch 200 is in contact with the upper wall surface 113 of the latch entrance and exit hole. When the push portion 330 is further raised while the latch 200 is in contact with the upper wall surface 113, as shown in FIG. 10, the pushing portion 336, which is the bottom edge of the raised slope 333, is finally shown. Will push the lever 300 farthest. At this time, the latch 200, the upper inclined surface 221 is sliding to the upper wall surface 113 of the latch entrance and exit hole is pushed outward.

In this case, the upper inclined surface 221 may be in contact with the upper wall surface 113 as a whole, such that the upper inclined surface 221 slides smoothly with respect to the upper wall surface 113. To this end, when the latch 200 is lifted up, the upper inclined surface 221 contacting the upper wall surface 113 may be approximately horizontal.

If the upper inclined surface 221 does not entirely contact the upper wall surface and is slightly inclined toward either side, it may be more difficult to withdraw the natural surface than when the upper inclined surface 221 is horizontal.

As described above, when the opening force required for the door is small, the latch 200 behaves in the order of FIGS. 8, 9, and 11 and can be unlocked, and the opening force required for the door is large. Edo 8, 9, 10 and 11 in the order of behavior can be unlocked. In any case, there is no problem in the automatic unlocking operation of the door. Therefore, even if there is a deviation in the force applied to the door for the automatic opening of the spring 823 of the hinge module 800 in the closing direction for each product, the latch holder of the present invention ( 10) can secure the unlocking of the latch.

In addition, as shown in FIG. 11, in any case, the force of the latch 200 reaching the position where the lock is released by the lever 300 to rotate downward is shifted in the horizontal direction on the inclined surface 111. Since the door is further opened forward, the opening operation of the door can be performed smoothly.

Referring to FIG. 15, when the lever 300 rotates about the shaft portion 310, first, the upper end of the lifting slope 333 slides with the latch and starts to lift the latch. Subsequently, as the lever 300 further rotates counterclockwise, the position of the pushing inclined surface 333 in contact with the latch 200 gradually moves to the lower portion of the pushing inclined surface 333. In addition, when the lever 300 is further rotated counterclockwise so that the pushing portion 336 is raised to the same height as the shaft portion 310, the lever 300 pushes the latch outward the most. That is, the lifting slope 333 is pushed up by lifting the latch 200 in the direction of the arrow shown in FIG.

When the pushing portion 336 rises to the same height as the height of the shaft 310 or further goes beyond the latch 200, the latch 200 is separated from the trajectory of the push portion 330. Accordingly, the latch 200 is dropped downward by the elasticity is downwardly applied as shown in FIG. In other words, the latch that is in contact with the upper wall surface 113 is lowered again. At this time, since the latch 200 is pushed further beyond the horizontal direction of the arrow shown in FIG. 15, the latch 200 is placed on the outer inclined surface 111. That is, the hook of the latch 200 is no longer caught on the inner inclined surface 112, and as the door is opened, the lower portion of the hook portion 230 may descend on the outer inclined surface 111.

Since the pusher 330 is disposed below the front of the shaft 310, the pusher 330 is raised to the same height as the shaft 310 so that the upper end portion of the pushing slope 333 is m higher than the original position. Will move forward. According to the present invention, the lower end inclined surface 232 of the latch 200 slides from the upper end to the lower end of the lifting slope 333, so that the latch 200 is pushed forward by n more.

FIG. 12 illustrates an opening angle a1 in which the latch 200 is pushed outward to open the door as shown in FIG. 11. As the door is not vertical and is inclined by an angle of a1 as shown, the door is opened by itself due to the weight of the door. However, if there is no speed control for the door opening by itself, the door may open and accelerate to fall. In the present invention, when the door 720 is opened, the damper starts to act at a predetermined angle (a2) to open slowly at a controlled speed until the final opening angle (a3), thereby impinging on the hinge module 800 of the door. This prevents the door from breaking and the user feels comfortable while watching the door open automatically.

[Door auto opening operation]

When the user touches a display or the like installed on the front of the door and inputs a door opening command, the latch holder 10 operates in the order of FIGS. 5 to 7, and accordingly, the latch holder 10 operates in the order of FIGS. 8 to 11. 200 is released from the latch holder 10 so that the door is pushed by a predetermined angle a1.

The predetermined angle a1 may be set to such an extent that the door may open by itself. The angle a1 may be, for example, about 2 to 7 °, and preferably about 3 to 5 °.

Referring to FIGS. 13 and 14, the hinge module 800 connecting the main body 710 and the door 720 may include a portion of the door bar 840 fixed to the door 720 and a main body 710. A portion of the housing 810 rotates based on the opening / closing rotation shaft 814.

As the door bar 840 rotates with respect to the housing 810, a damping force is transmitted to the door bar 840.

An inner link housing 830 is provided inside the housing 810 to move along the longitudinal direction of the housing. The front end of the inner link housing 830 is hinged at the door bar 840 and the door bar connection hinge 831. Since the door bar connection hinge 831 is slightly eccentric in the opening and closing rotation shaft 814, when the door 720 (door bar 840) is opened, the door bar connection hinge 831 is moved forward with respect to the opening and closing rotation shaft 814. Accordingly, the inner link housing 830 also moves forward in the housing 810.

A spring interpolation pin 820 is installed at the rear of the inner link housing 830. The spring interpolation pin 820 is connected to the rear portion of the inner link housing 830 and the inner housing joint pin 822. Both ends of the inner housing joint pin 822 are fitted to the joint pin guide slot 815 provided in the housing 810. The joint pin guide slot 815 has a shape of a long hole extending along the longitudinal direction of the housing 810.

The spring interpolation pin 820 is extrapolated in a state where the compression coil spring 823, which is very elastic, is already compressed. The spring interpolation pin 820 may slide through the spring stopping plate 811 fixed to the housing 810 along the longitudinal direction of the housing 810, but the front end portion of the compression coil spring 823 may be moved. The spring catching plate 811 of the housing 810 is caught. To support the force of the compression coil spring 823, a support pin 812 may be further installed in the housing 810 to further support the spring catching plate 811.

A spring support pin 821 is provided at a rear end of the spring interpolation pin 820 to fix the rear end of the spring 823. The spring support pins 821 do not interfere with the housing 810.

Therefore, when the door bar 840 is opened, the inner housing joint pin 822 is guided by the guide slot 815 of the housing 810 and the inner link housing 830 and the spring interpolation pin 820 move forward. . Accordingly, the spring 823 is compressed between the spring stopping plate 811 and the spring support pin 821, and the elastic force is gradually increased. That is, when the opening angle of the door is small, the elastic force of the spring 823 is small, but as the opening angle of the door is large, the elastic force of the spring 823 also increases. The elastic force acts in a direction that prevents the door from opening.

The biasing force that the spring 823 pushes in the direction of closing the door becomes larger as the door opens from a1 to a3. The force applied by the spring 823 at the opening angle a1 of the door is smaller than the force that the door opens by itself due to the weight of the door at the opening angle a1, so that the door pushed by the lever 300 to the opening angle a1 It is set to open on its own.

A damper 850 is installed inside the inner link housing 830. The piston 851 of the damper 850 is supported by the damper pressing surface 832 integrally fixed to the inner link housing 830. A cylinder 852 is extrapolated to the piston 851. A slot 853 in which the damper support pin 813 fixed to the housing 810 is inserted is provided at the upper portion of the cylinder 852. That is, the cylinder 852 may move back and forth by the length of the slot 853. 14 shows the position between the slot 853 of the damper 850 and the damper support pin 813 of the housing 810 with the door closed.

The inner link housing 830 moves forward and the damper 850 also moves forward until the door is opened and moved at a predetermined angle a2. At this time, the damper 850 moves forward with the inner link housing 830, but does not generate any damping force.

As soon as the opening angle of the door exceeds a2, the slot 853 of the damper 850 moving forward is caught by the damper support pin 813, so that the damper 850 begins to be compressed. The damping force generated by the damper 850 being compressed causes the door to be attenuated and opened at the opening angle a2 to a3.

While the door is opened to a2, the door bar connection hinge 831 also rotates by a2, so that the inner link housing 830 and the spring interpolation pin 820 move forward by d2. While traveling by a distance of d2, the slot 853 of the damper 850 moves on the damper support pin 813, so that the damper is not pressed.

While the door is opened to a3, the door bar connection hinge 831 also rotates by a3, so that the inner link housing 830 and the spring interpolation pin 820 move forward by d3. That is, the spring 823 is compressed by d3. The maximum opening angle a3 may be regulated by the joint pin guide slot 815 of the housing 810 which regulates the slide movement distance of the inner housing joint pin 822.

The angular range in which the damper 850 attenuates the opening force of the door may begin, for example, when the door is about 30 ° to 40 ° and continue until approximately 90 °. Then, the door is opened by the latch holder 10 to the initial opening angle a1, and then slowly accelerated and opened by its own weight, and slowly opened by the damper's damping force when a2 (about 30 ° to 40 °) is released. Can be. This opening of the door allows the user to feel secure.

If the attenuation begins too early with the door open, the waiting time for the door to open is too long, causing discomfort. On the other hand, if the attenuation of the door begins too late, the door opens too quickly to the extent that the door is opened to a considerable extent, which may cause a user to be surprised or uncomfortable, and may be injured by hitting the fast opening door.

In this regard, the damping intrusion angle a2 at which the damper 850 begins to dampen the opening force of the door is preferably 35 ± 5 °.

The damping force may last up to 90 ° when the door is fully open, or up to 85 ° about 5 ° less. If the damping force is fully applied until the door is fully opened, it may be considered that the damping force does not act after 85 ° in order to avoid the possibility that the door will not open completely and open about 1-2 degrees less.

As such, the attenuation intrusion angle a2 is set larger than the forced opening angle a1. The section between the forced opening angle a1 and the damping rush angle a2, that is, 3 ° to 5 ° or more and 30 to 40 ° or less, is a section in which the door is opened by itself without being damped by any damper 850. Becomes Of course, even in this section, the elastic force of the spring 823 described above acts in a direction that hinders the opening of the door, so that a phenomenon in which the door is rapidly accelerated in the section open by itself is sufficiently prevented.

Applying such an automatic door opening structure can reduce the user's anxiety, improve the quality sensitivity, and can delete the handle protruding toward the front of the door can provide an excellent aesthetic in particular when built-in installation.

[Door auto opening operation control method]

Hereinafter, a method of controlling the automatic door opening operation according to the present invention will be described in detail with reference to FIGS. 16 to 18.

According to the present invention, the automatic opening operation of the door is made by one rotation of the motor 610. The pusher 500 rotates while the motor rotates by one, and the pusher cam 540 eccentrically disposed on the pusher pushes the lever 300 and returns to the original position. The lever 300 pushes the latch 300 upward by the pusher cam 540, and thus the door is automatically opened.

Due to the structure of the latch holder 10 described above, the latch holder may exist in four states in a state where the power of the cooker of the present invention is turned off.

First, as shown in FIG. 8, the door is closed to maintain the latch 200 in the latch holder 10, and the lever 300 moves most clockwise by the downward pressing force of the latch 200. It is a case where it is arrange | positioned in the state and the pusher 500 is in the correct position state holding down the return stop switch 620.

Second, the door is open as shown in FIG. 7, and the pusher 500 is aligned with the correct position to hold the return stop switch 620.

Third, the pusher 500 rotates and stops due to a problem such as a power failure. As shown in FIG. 6, the pusher 500 is out of the state of pressing the return stop switch, and the push part 330 of the lever 300 is moved. If the door is open, the door is open. In the state as shown in FIG. 6, since the push part 330 of the lever 300 blocks the entrance of the latch holder 10, the latch 200 cannot enter the latch holder, and thus the door cannot be closed. .

Fourth, between the state of FIG. 6 and the state of FIG. 7, that is, the push unit 330 is not blocking the entrance of the latch holder 10 but slightly lowered, the pusher 530 of the pusher returns the return stop switch ( 620 is in the initial state without pressing. In this case, the latch 200 may enter into the latch holder. When the latch enters into the latch holder, the load of the latch presses the lever, so that the lever is forcibly rotated and the lever rotates and the pusher 500 moves. Move to eventually change to the state as shown in FIG.

According to the present invention, the pusher 500 is rotated one time and the opening operation of the door is made, and the pusher 500 is controlled to start one rotation by starting to rotate from the position of FIG. 8. As such, when the pusher 500 rotates once, the push part 330 of the lever 300 is correctly raised once, thereby automatically opening the door. If the pusher 500 is not rotated and the rotation of the pusher 500 for the door opening operation is started in the position as shown in FIG. 6, the reliability of the automatic door opening operation is deteriorated.

In the present invention, when the cooker is first started, for example, when the user connects the power plug of the cooker to the outlet, or when the user presses the power button of the cooker to turn on the power, the pusher 500 is in the correct position Perform the operation control to make

8 or 7, when the pusher 500 already presses the return stop switch 620 to signal that the return stop switch is on, it is confirmed that it is already in the correct position, so the position of the pusher 500 is firmly determined. There is no need to do the sorting operation. On the contrary, if the pusher 500 is rotated to align the position while the door is closed as shown in FIG. 8, a problem of opening the closed door may occur.

In this state, the standby state is maintained until the user inputs a door open command.

On the other hand, in the state in which the pusher 500 leaves the home position pressing the return stop switch 620 as shown in FIG. 6, since the door is expected to be opened anyway, even if the pusher is rotated to align the pusher 500 in the right position. In this case, an abnormal operation such as opening a door in which the door is closed by the user does not occur.

That is, when the cooking appliance is started (when the power is connected or the power button is turned on), if it is detected that the return stop switch is in an off state, that is, it is not pressed, the pusher 500 shown in FIG. do.

The initial home position alignment procedure is to first power the motor. According to the control method of the present invention, the motor is driven by supplying a normal continuous power supply (which may be an alternating power supply) without supplying a power supply (pulse power supply or the like) which causes the motor to be rotated from the normal rotation.

When the motor is powered, the motor will rotate. Accordingly, when the pusher 500 rotates to reach a position as shown in FIG. 7, the power that was supplied to the motor by pressing the return stop switch 620 is cut off, and the pusher is aligned in the right position.

The controller checks if the return stop switch is pressed after a sufficient time t ₀ for the motor to rotate once. If it is confirmed that the return stop switch is pressed, the motor is operating normally, the return stop switch is also operating normally, it can be confirmed that the pusher 500 is aligned in the initial home position. If this state is confirmed, as described above, the user will maintain the standby state until the user inputs a door open command.

If it is not confirmed that the return stop switch is pressed after the time t ₀ , it may be determined that the motor or the return stop switch is abnormal. As described above, since the door cannot be closed in the state as shown in FIG. 6, since the open detection switch 400 is in the off state and the door is open, the door is opened by moving the motor. It is difficult to check whether the motor is operating normally. Then, the controller may generate a fourth error signal indicating that there is an error in the motor or the return stop switch. In addition, the operation of the cooking appliance may be terminated as a follow-up measure.

After the pusher 500 is aligned, it is expected that all of the states waiting for the user's door opening command are the same as those of FIG. 7 or 8. Even if the door open command is input and rotates the pusher 500 in the same state as that of FIG.

Of course, as shown in FIG. 7, that is, the return stop switch is pressed but the open detection switch is not pressed, so that the user may not supply power to the motor even if the user inputs a door open command. However, it is notable that the state of FIG. 7 or FIG. 8 does not have to correspond to the door open command for the sake of simplicity of the control algorithm.

Note that the door can be opened automatically or manually in the present invention will be more helpful to understand the door automatic opening operation control method of the present invention.

When power is supplied to the motor by the user's door open command input, check if the return stop switch is turned off after a while. If the return stop switch is turned off, you can see that the motor has started to rotate normally.

Then, after sufficient time t ₀ for the motor to rotate one time, it is checked whether the open detection switch is turned off. If the state as shown in FIG. 8, the open detection switch that was turned on while the door was opened will be turned off, and if the state was shown in FIG. 7, the open detection switch would have been turned off. Therefore, in any case, if the open detection switch is turned off after the predetermined time, it is possible to confirm that the latch has normally come out of the latch holder.

Next, after sufficient time has passed for the motor to rotate one turn, check that the return stop switch is on again. If the motor has returned to the normal position, the return stop switch is pressed, and thus the return stop switch can be confirmed that it is operating normally. In addition, when the return stop switch is pressed, the power supplied to the motor is cut off immediately, so that the pusher is also in the initial position.

At this time, the controller is in a state of waiting for the user's door opening command again.

On the other hand, if the return stop switch is not turned on after sufficient time for the motor to rotate one time, it may be expected that the motor or the return stop switch has an error.

If the open detection switch is switched from the on state to the off state during the predetermined time (that is, the door is confirmed to be open), and if the return stop switch does not switch to the on state after a predetermined time, the return stop switch is abnormal. Can be detected. If it is determined as such, it is possible to generate a second error signal indicating that there is an error in the return stop switch, and cut off the power supplied to the motor.

On the other hand, if the door is already open, and the open detection switch is kept off for the predetermined time, it may be difficult to clearly determine whether there is an abnormality between the motor and the return stop switch. However, when power is supplied to the motor, it is confirmed that the return stop switch has been switched from the on state to the off state. Therefore, the return stop switch is more likely to have an error than the motor. Therefore, if it is determined as such, it is possible to generate a second error signal indicating that there is an error in the return stop switch, and cut off the power supplied to the motor.

That is, in any case, if the return stop switch is not turned on, it may be confirmed that there is an error in the return stop switch and may generate a second error signal.

On the other hand, even though the power is supplied to the motor by the user's door open command input and the return stop switch is turned off, the open detection switch is activated even after a sufficient time t ₀ for the motor to rotate one time. If it is in the ON state, the motor is rotating normally, but there is an obstacle in the direction of opening the door, which may prevent the door from being opened or the door latch is caught in the latch holder in an incorrect shape and the door is not opened properly. Therefore, it is possible to generate the first error signal indicating the abnormality of the latch operation and to cut off the power supplied to the motor.

On the other hand, even if the power is supplied to the motor by the user's door open command input, if the return stop switch is not turned off, it can enter the error signal generation step as shown in FIG. That is, at this time, it is obvious that either the motor or the return stop switch is abnormal. However, it is possible to check whether there is any problem between the motor and the return stop switch by checking additional signals.

This can be confirmed based on whether the door is open as shown in FIG. 18. That is, when the power is supplied to the motor, the open detection switch is turned on, that is, the door is closed. If the open detection switch is switched off after a predetermined time, the door is opened. This results in the motor being normal. Therefore, in such a situation, it is possible to determine that there is an error in the return stop switch, generate a second error signal, cut off the power supplied to the motor, and then terminate.

On the other hand, when the power is supplied to the motor, the open detection switch is turned on, that is, the door is closed. If the open detection switch is still on after a predetermined time, it can be seen that the door is still closed. This results in an abnormal motor. Therefore, in such a situation, it may be determined that there is an error in the motor, and a third error signal may be generated and the power supplied to the motor may be cut off and then terminated.

However, if the open sensing switch is turned off, i.e., the door is open from the time when the power is already supplied to the motor, it is difficult to check whether the motor is operating through the open sensing switch. A fourth error signal indicating that one has failed may be generated, the power supplied to the motor may be cut off, and the control may be terminated.

According to the above-described control method, the general power is supplied to the motor without generating and supplying the power to the motor in addition to the normal continuous AC power supplied to the cooking appliance.

And, without installing a separate sensor for detecting the operation of the motor, the return stop switch, which is a necessary configuration to determine the stop position of the motor, and the configuration that has been used conventionally to check whether the door is open By using the signal of the open sensing switch, it is possible to monitor whether the automatic opening structure is operating normally.

Although the present invention has been described with reference to the drawings exemplified as above, the present invention is not limited to the embodiments and drawings disclosed herein, and various modifications may be made by those skilled in the art within the scope of the technical idea of the present invention. It is obvious that modifications can be made. In addition, even if the above described embodiments of the present invention while not explicitly described and described the operation and effect according to the configuration of the present invention, it is obvious that the effect predictable by the corresponding configuration should also be recognized.

10: latch holder
100: holder body
101: base surface
110: latch entrance and exit
111: outer slope
112: internal slope
113: upper wall
114: side wall surface
120: lever support
121: extension member
122: lever support shaft
123: shielding surface
130: pusher support
131: hall
140: return spring support
141: hook hanger
150: opening detection switch fixing part
151: fixed wall
160: return stop switch fixing portion
170: pusher drive unit fixing portion
180: hook receiving space
200: latch
210: latch pivot axis
220: latch bar
221: top slope
230: hook portion
231: backside slope
232: Lower end slope
233: tip plane
300: lever
310: shaft
320: working part
330: push part
331: interpolation member
332: extrapolation member
333: push-up slope
334: top
335: bottom
336: extrusion
340: power point
342: Spring High Government
350: direction switching unit
400: open detection switch
410: switch body
420: trigger
500: pusher
510: axis of rotation
520: rotating plate
530: pusher
531: curved portion
5311: Surface profile
5312: hold-down profile
540: pusher cam
600: pusher drive unit
610: motor
611: rotary drive shaft
612: housing
620: return stop switch
621: switch body
622: trigger
630: return spring
710: main body
720: door
800: hinge module
810: housing
811: spring catching plate
812: spring catching plate support pin
813: damper support pin
814: opening and closing rotary shaft
815: joint pin guide slot
820: spring interpolation pin
821: spring support pin
822: internal housing joint pin
823: spring
830: inner link housing
831: door bar connection hinge
832: damper pressurized surface
840: door bar
850: damper
851: piston
852 cylinder
853: slot

Claims (16)

A main body 710 having a cooking chamber therein and a door 720 for opening and closing an open front of the cooking chamber,
On the surface where the door 720 faces the main body 710, a latch 200 extending toward the main body 710 is provided, and the latch 200 is provided while the door 720 is closed. In the portion of the body 710 corresponding to the position, a latch holder which is engaged with the latch 200 to keep the door 720 closed or is released from the latch 200 to open the door 720 ( 10) is provided,
The latch holder 10 is:
A lever (300) for pushing the latch (200) inserted into the latch holder (10) out of the latch holder (10);
An open detection switch 400 in which the latch 200 is in an on state or in an off state in a state in which the latch 200 is latched and released;
A pusher 500 for operating the lever 300;
A motor (610) for driving the pusher (500); And
And a return stop switch 620 which is in an on state or in an off state when the pusher 500 is in a predetermined position and when the pusher 500 is in a position outside the predetermined position.
As the return stop switch 620 is switched to the on state when the power is supplied to the motor as a door automatic opening control method of the cooking appliance is cut off the power supplied to the motor,
A first step of checking whether the return stop switch 620 is turned on when the cooking appliance is turned on;
A second step of supplying power to the motor when the return stop switch 620 is off in the first step;
A third step of supplying power to the motor in a second step and checking whether the return stop switch 620 is on after a predetermined time t ₀ elapses; And
If it is confirmed in the third step that the return stop switch 620 is switched to the on state, step 4-1 to return to the first step; Automatic door control method comprising a.
The method according to claim 1,
If it is confirmed in the third step that the return stop switch 620 maintains the off state, step 4-2 of generating a fourth error signal; Automatic door control method further comprising.
The method according to claim 1,
A fifth step of waiting for a user's door open command when the return stop switch 620 is turned on in a first step;
A sixth step of supplying power to the motor and checking whether the return stop switch is turned off when the door open command of the user is input in the fifth step;
In a sixth step, when it is confirmed that the return stop switch is turned off, a seventh step of checking whether the open detection switch is turned off after a predetermined time elapses;
An eighth step of checking whether the return stop switch is in an on state when it is confirmed in the seventh step that the open detecting switch is in an off state; And
If it is confirmed in the eighth step that the return stop switch is turned on, step 9-1 to return to the first step; Automatic door opening control method further comprising.
The method according to claim 3,
And a step 9-2 of generating a second error signal when the return stop switch is not turned on in the eighth step and remains in the off state.
The method according to claim 3,
And a tenth step of generating a first error signal when it is confirmed in the seventh step that the open detection switch is maintained in an on state without switching to an off state.

The method according to claim 1,
A fifth step of waiting for a user's door open command when the return stop switch 620 is turned on in a first step;
A sixth step of supplying power to the motor and checking whether the return stop switch is turned off when the door open command of the user is input in the fifth step; And
And an error signal generating step of generating an error signal when it is confirmed in step 6 that the return stop switch is maintained in the on state without being switched off.
The method according to claim 6,
The error signal generating step is:
If it is confirmed that the return stop switch is in the off state while the open detection switch is in the off state when the power is supplied to the motor in the sixth step, a fourth error signal is generated. Step 11; Automatic door opening control method comprising a.
The method according to claim 6,
The error signal generating step is:
A twelfth step of checking whether the open detection switch is switched to the off state after a predetermined time elapses when the open detection switch is in the on state when power is supplied to the motor in the sixth step; Automatic opening control method.
The method according to claim 8,
The error signal generating step is:
If it is confirmed in the twelfth step that the open detection switch is switched to the off state, step 13-1 to generate a second error signal; Automatic door control method further comprising.
The method according to claim 8,
The error signal generating step is:
If it is confirmed in the twelfth step that the open detection switch is not in the off state to maintain the on state, step 13-2 of generating a third error signal; door automatic opening control method further comprising.
The method according to claim 1,
A fifth step of waiting for a user's door open command when the return stop switch 620 is turned on in a first step;
A sixth step of supplying power to the motor and checking whether the return stop switch is turned off when the door open command of the user is input in the fifth step; And
Determining that the motor is abnormal when the return stop switch is not turned off in the sixth step, and if the return stop switch is turned off in the sixth step, determining that the motor is normal Automatic door control method further comprising;
The method according to claim 1,
A fifth step of waiting for a user's door open command when the return stop switch 620 is turned on in a first step;
A sixth step of supplying power to the motor and checking whether the return stop switch is turned off when the door open command of the user is input in the fifth step; And
And determining that there is an abnormality in the latch operation when the return stop switch is turned off in the sixth step and remains in the off state even after a predetermined time has elapsed.
The method according to claim 1,
A fifth step of waiting for a user's door open command when the return stop switch 620 is turned on in a first step;
A sixth step of supplying power to the motor and checking whether the return stop switch is turned off when the door open command of the user is input in the fifth step; And
Determining that there is an error in the return stop switch when the return stop switch remains off after a predetermined time even after the open detection switch is turned off after the return stop switch is turned off in the sixth step; Door automatic opening control method further comprising.
The method according to claim 1,
A fifth step of waiting for a user's door open command when the return stop switch 620 is turned on in a first step;
A sixth step of supplying power to the motor and checking whether the return stop switch is turned off when the door open command of the user is input in the fifth step; And
Determining that there is an error in the return stop switch when the open detection switch is turned off after a predetermined time even though the return stop switch remains in the on state without turning off in the sixth step. Door automatic opening control method.
The method according to any one of claims 1 to 14,
After the cooker is turned on, the period of time the power is supplied to the motor, the on-off state of the return stop switch and the on-off state of the open detection switch is continuously detected.
The method according to any one of claims 1 to 14,
The power supply to the motor is a door automatic opening control method that is input as a continuous signal.

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