JPH0320652Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a cooking appliance such as a toaster oven in which a control device for controlling a cooking heater includes a mechanical timer.

[Technical background of the invention]

When baking bread, etc. in a toaster oven, it takes time the first time because the inside of the oven is cold, so if you are baking bread for a second time or later,
It is known that baking time is shorter than the first time because the inside of the oven is warmer.

For this reason, a toaster oven has been proposed that automatically adjusts the first baking time and the subsequent baking times to continuously bake bread to a desired color. , an outline of its configuration is shown in FIG.

This toaster is equipped with a mechanical timer 1 that turns on and off electricity to a cooking heater, and a timer lock mechanism 3 controls a lock pin 2 that the timer 1 has and that stops the timer operation when pushed in. 1 is provided with a browning adjustment mechanism 4 that interlocks and winds up the paper. In other words, 4a is a set knob of the browning adjustment mechanism 4, and the amount by which this knob is pressed is determined by the browning adjustment knob (not shown), and the timer 1 is interlocked with the amount corresponding to the amount by which the spring is wound. The timer operation time is now set. The timer 1 has a built-in balance wheel 5, and the operation of the balance wheel 5 causes the mainspring to rewind, and the lock pin 2 is pushed in to stop the balance wheel 5 and stop the timer operation. . The timer lock mechanism 3 also includes a cam member 7 that is rotatable about a pivot shaft 6, a lever 9 that is rotatable about a pivot shaft 8, and a spring stretched between the cam member 7 and the lever 9. 10, a first bimetal 11 of low-temperature operation type attached to the lever 9, an insulating protrusion 12 protruding from the tip of this bimetal 11, and a self-heating type bimetal with the tip disposed opposite to the protrusion 12. and a medium temperature operating type second bimetal 13, and this second bimetal 1.
It is formed by an adjusting screw 14 for adjusting the gap G between 3 and the insulating protrusion 12. Cam member 7
These include a cam surface 7a on which the pressing portion 4c of the set knob 4a slides, a control portion 7b for pushing the lock pin 2,
It has a stepped portion 7c and an engaging portion 7d. Further, the lever 9 has a first holding portion 9a and a second holding portion 9a.
It has a holding part 9b.

This timer lock mechanism 3 normally has a spring 10.
The timer 1 is held in the position shown by the solid line in FIG. 1 by the force of , and the engagement of the engaging portion 7d and the first holding portion 9a, so that the timer 1 can be freely operated by the timer knob. Then turn the set knob 4a to 1
When pressed down to bake bread for the second time, first, the force of the spring 10 engages the engaging portion 7d and the second holding portion 9b, and the product is held in the position shown by the two-dot chain line in FIG. . Therefore, the lock pin 2 is pushed in by the control section 7b and the timer 1 stops its timer operation (however, since the timer 1 is wound up as the lock pin 2 is pushed in in conjunction with the set knob 4a, this timer (Switch 1 is in the closed state.) Therefore, the second bimetal 13 generates heat together with the cooking heater, causing the second bimetal 13 to warp downward, while the first bimetal 11 warps upward as the ambient temperature increases. and,
The second bimetal 13 is connected to the first bimetal via the insulating protrusion 12.
When the bimetal 11 is pushed down against it, the timer lock mechanism 3 returns to the state shown by the solid line in FIG. 1, and the timer 1 starts to rewind.
In the case of the first bread baking performed in this manner, the sum of the lock time during which the rewinding operation of the timer 1 is stopped and the operating time of the timer 1 becomes the actual bread baking time. When baking bread for the second time consecutively after baking the bread for the first time, it is sufficient to press down the set knob 4a until it stops in the same way as the first time. In this case, the state shown by the two-dot chain line in Fig. 1 is the same, but both bimetal 1
1 and 13 are already warped due to residual heat, so 1
Compared to the gap G when baking bread for the first time,
The gap G in the second case has become smaller or has disappeared. Therefore, the rewinding operation of the timer 1 is started quickly, and the second bread baking is performed approximately within the operating time of the timer 1. That is, the above operating principle ensures that the browning color is the same during continuous baking.

[Problems with background technology]

However, the toaster oven described above has the drawback that the timer lock mechanism 3 has an extremely large number of parts, making the structure and assembly complicated.
Moreover, since there are a large number of parts and two bimetals 11 and 13 are used, the adjusting screw 1
4 has the disadvantage that the work of setting the lock time is extremely troublesome. Furthermore, one bimetal 11
Since a low-temperature operating type is used, it is easily affected by the ambient temperature (room temperature), and therefore has the disadvantage that, for example, when used in a cold region and a warm region, there is a difference in browning.

[Purpose of invention]

Therefore, an object of the present invention is to provide a timer lock mechanism that has a simple structure, is easy to adjust and assemble, and can easily obtain a desired lock time.
Moreover, it is an object of the present invention to provide a cooking device that can bake the same color regardless of regional differences in the case of continuous baking with increased reliability.

[Summary of the idea]

The present invention has a timer lock mechanism that controls a lock member that stops the timer operation of a mechanical timer that turns on and off electricity to a cooking heater, and includes a control unit that can constantly energize the lock member and move it into and out of contact with the timer lock mechanism. a high-temperature operating bimetal provided at one end; a heater extending in the length direction of the bimetal and disposed along and near the bimetal, and energized together with the cooking heater to heat the bimetal; one end of the heater for heating the bimetal is thermally conductively and integrally connected to the bimetal, the heater is cantilevered to the bimetal, and one end of the heater on the connecting side This cooking device is characterized by having a heat dissipation section provided at the top of the cooker, and with this configuration, the desired purpose has been achieved.

[Example of idea]

An embodiment of the present invention will be described below with reference to FIGS. 2 to 9.

21 in Figure 2 is the cooker housing, and on the front side,
A door 22 with a see-through window is installed so that it can be opened and closed, and an operation panel 2 is installed adjacent to the door 22.
3 is provided. The door 22 opens and closes the inside of the refrigerator inside the housing 21, and in conjunction with the opening and closing of the door 22, a cooking grate (not shown) housed inside the refrigerator is pushed out and retracted.

Inside the casing 21, a control device 24 is provided adjacent to the interior of the refrigerator and on the back side of the panel 23. This device 24 controls upper and lower cooking heaters (not shown) provided in the refrigerator, and also controls a timer 2 as illustrated in FIGS. 3 to 9.
6, a browning adjustment mechanism 27, a timer lock mechanism 28, etc., and each part will be described in detail below.

29 in the figure is a device board made of sheet metal, and the operation panel 2
It can be installed by screwing it onto the back side of 3. A timer 26 is screwed to the upper back surface of this board 29. The timer 26 is a mainspring,
It is a mechanical type with a built-in gear, balance, etc. (none of which are shown), and has a bell 30, a bell hammer 31, etc. that notify the completion of rewinding (timer operation). Furthermore, the timer 26 has a switch that closes simultaneously with winding of the mainspring, and
It has a locking member 33. Lock member 33
is movable, and when pushed in locks the balance and other components to stop the rewinding operation of the timer (hereinafter referred to as timer lock). The axis 34 of this timer 26 has a
As shown in the figure, an operating shaft 35 is fitted and a pin 36 is provided protrudingly. The pin 36 is attached to the operating shaft 35 in order to rotate the operating shaft 35 together.
It is inserted through the cut groove 37 of No. 5. And operation axis 3
A timer knob 38 is attached to the front portion of the operation panel 5 that projects outside.

The browning adjustment mechanism 27 has the configuration shown in FIGS. 3 and 4. That is, a guide shaft 39 is provided along the vertical direction on the device board 29, and a baking set table 40 that interlocks and winds the timer 26 is supported on this shaft 39 so as to be movable up and down. The interlocking structure between the setting table 40 and the timer 26 is as follows. An interlocking sleeve 41 made of synthetic resin is rotatably fitted onto the operating shaft 35 . This sleeve 41 is integrally formed with a pin engagement protrusion 42 and an arm 44 having an engagement hole 43 made of an elongated hole.
An engagement pin 45 protruding from is engaged. The protrusion 42 is provided on the unwinding side with respect to the pin 36. Therefore, when the baking set table 40 is lowered, the interlocking probe sleeve 41 is rotated at the same time, and the timer 26 is wound up by the engagement of the protrusion 42 with the pin 36.
Of course, if the protrusion 42 and the pin 36 are engaged, the browning set table 40 will be raised in conjunction with the rewinding of the timer 26, and if only the timer knob 38 is turned, the pin 36 will be raised. moves away from the protrusion 42, so the baking set table 40 is not interlocked. Reference numeral 25 denotes a leaf spring screwed to the device board 29, which can be engaged with and detached from the protrusion 41a of the interlocking sleeve 41, and its engagement prevents the baking set table 40 from falling under its own weight when the timer knob 38 is operated. It is designed to be held in place. Further, below the baking setting table 40, a baking color adjusting cam 46 is rotatably attached to a rearward-facing cam attachment portion 29a of the device board 29. This cam 46 is made of synthetic resin, and its cam surface has an uneven shape. and,
The cam shaft 47 passes through one side wall 21a of the housing 21, and a browning adjustment knob 48 is attached to the penetrating portion. Furthermore, a set table stopper 50 made of sheet metal and having a cam follower arm 49 that engages with the cam surface of the baking set table 40 is supported by the guide shaft 39 so as to be movable up and down. The cam follower arm 49 is formed by connecting a horizontal engaging end 49a to the upper end of the upwardly facing part, and the engaging end 49a has a tapered shape such as a V shape and engages with the unevenness of the cam surface. I'm starting to do that. It goes without saying that the cam shaft 47 is disposed vertically below the engagement portion between the cam surface and the engagement end portion 49a. Then, the tapered engagement end 49a
The engagement between the cam 46 and the unevenness of the cam surface serves to prevent the cam 46 from being inadvertently rotated.
The set table stopper 50 is always urged downward by a spring 51. The set table stopper 50 is provided with a pointer portion 52. This pointer part 52 is attached to the lower front surface of the board 29 by a screw 5.
It is vertically movably inserted into the gap formed between the colored base plate 54 and the transparent plate 55 that covers the front surface of the colored base plate 54, which are fastened together at 3. The protruding portion of the transparent plate 55 is exposed flush with the surface of the operation panel 23, and the surface of the panel 23 is provided next to the transparent plate 55 to indicate the degree of baking, such as “light,” “medium,” and “dark.” ” is attached. Further, a setting knob 57 is attached to a knob mounting portion 40a of the browning setting table 40 that protrudes outside the operation panel 23. For example, the knob 57 may have a flat tip, or may have an alignment protrusion (not shown) on one side.
It is formed with Moreover, this knob 57
The baking set is arranged so that when the baking set table 40 is pushed down until it stops against the setting table stopper 50, the flat tip or the protrusion is at the same height as the pointer part 52. It is attached to a stand 40. By matching the position with the pointer portion 52, the user can confirm the baking setting, which is useful for preventing misuse.

The timer lock mechanism 28 is shown in FIGS. 8 and 9, and is a bimetallic 5
8, a heater 59 provided near this, a spring 60 that biases the bimetal 58, and an adjustment screw 61. Here, the high-temperature operating type has specifications such as a curvature coefficient of 12K x 10 ^-6 /℃, a proportional temperature range of -20℃ to 350℃, and an allowable temperature range of -70℃ to 450℃. . Bimetal 58 above
has a control section 58a made of sheet metal at one end, and a mounting section 58b at the other end. Mounting part 58
b is pivoted to the lock mechanism mounting portion 29b of the device board 29 via a pivot screw 62. Then, due to the biasing force of the spring 60, the control unit 5 of the bimetal 58
8a constantly pushes the locking member 33.
In addition, the heater 59 has a plate-shaped metal winding core 63 sandwiched between upper and lower surfaces of insulating plates 64 made of mica or the like.
A strip-shaped heater material 65 is wound around these upper and lower insulating plates 64. The heater material 65 is used as a cooking heater as well as a switch for the timer 26.
It is energized when turned on. This heater 59
is thermally conductively and integrally connected and supported by the bimetal 58, extends in the length direction of the bimetal 58, and is provided directly opposite and in the vicinity of the bimetal 58. Note that this embodiment shows a case in which the heater 59 is disposed near the lower surface of the bimetal 58 on the low expansion side, and the heater 59 is disposed near the lower surface of the bimetal 58 on the low expansion side.
3 is connected to one end portion of the bimetal 58 by a heat-conducting connector 66, and the heater 59 is cantilever-supported by the bimetal 58. Moreover, this heater 59 has a heat dissipation section 67 on the side where it is connected to the bimetal 58.
It is equipped with In the case of this embodiment, the heat dissipation section 67 is formed of an L-shaped portion formed by extending one end of the metal winding core 63 on the connection section side and bending it downward.

In addition, 32 in FIGS. 1 and 8 is an exhaust hole provided in the cooker housing 21 facing above the timer lock mechanism 28, which lowers the ambient temperature near the bimetal 58 and controls the operation of the bimetal 58. In addition to making the timer 26 larger, the timer 26 is also prevented from overheating.

For example, when baking bread continuously in the toaster oven, first put the first bread into the oven and then operate the browning adjustment knob 48 to control the browning adjustment cam 4.
Turn 6. As a result, the distance between the engaging end 49a of the cam follower arm 49 of the set table stopper 50, which is always pressed against the cam surface by the spring 51, and the cam shaft 47 changes, and at the same time, the set table stopper 5
0 rises or falls along the guide axis 39. Therefore, since the pointer section 52 also moves up and down, the user can adjust the desired browning color using the pointer section 52 and the browning color display 56 as a guide. After this, set knob 5
7, the baking set table 40 is pushed down along the guide shaft 39 until its lower end abuts the set table stopper 50 and stops. When this depression is completed, the height positions of the pointer portion 52 and the set knob 57 match.
Then, in conjunction with the baking setting table 40, the timer 26 and the timer knob 38 are wound up through the interlocking sleeve 41 by an angle corresponding to the amount of descent thereof. As a result, the timer 26 is switched on, the cooking heater and the heater 59 are energized, and the first bread baking is started. The first bread baking is continued after the timer lock mechanism 28 releases the timer lock until the timer operation is completed, so that the bread can be baked to a predetermined color while warming the entire cold toaster oven.

Note that the timer lock is released as follows. In other words, the bimetal 5 due to the heater 59
The temperature of the bimetal 58 rises as the bimetal 8 is heated, and when the temperature reaches the deformation temperature of the bimetal 58, the bimetal 58 is curved and deformed in an upwardly convex manner. Due to this deformation and the force of the spring 60, the mounting portion 58b of the bimetal 58 first becomes attached to the adjustment screw 6.
1, the control portion 58a of the bimetal 58 begins to move downward. This control section 58a
As the timer 26 moves, the locking member 33 of the timer 26 is also gradually moved downward, so that when a certain point is exceeded, the locking of the balance by the locking member 33 is released. That is, the timer lock is released as described above, and the timer 26 starts its timer operation.

Next, after putting the bread to be baked for the second time into the oven, the browning setting table 40 is pushed down again via the setting knob 57 until it hits the setting table stopper 50. Then, the timer 26 interlocks and winds up the same amount as the first time, but this time the bimetal 58 has already been deformed by residual heat and is not locked, so the timer 26 immediately starts its timer operation. The second time the bread is baked in a shorter time than the first time. This allows you to bake the bread the second time with the same color as the first time.

As described above, the user does not have to worry about resetting the time using the timer knob 38 every time he bakes bread.
After operating the browning adjustment knob 48 once, bread with the same browning color can be obtained by simply pressing down the set knob 57.

According to the above embodiment of the present invention, the timer lock mechanism 28 includes a bimetal 58, a heater 59,
Since it is composed of a spring 60 and an adjusting screw 61, the number of parts can be considerably reduced compared to the conventional one.
Therefore, assembly and structure can be simplified and costs can be reduced. Furthermore, since the bimetal 58 is a single piece, adjustments such as the time for stopping the timer operation (lock time) can be easily performed.

Furthermore, in addition to using a high-temperature operating type for the bimetal 58, a heater 5 for heating the bimetal 58 is used.
9 in the vicinity of the bimetal 58 to gradually increase the temperature of the bimetal 58, a desired locking time can be easily obtained. Incidentally, if the heater material 65 is wound directly around the bimetal 58 via a mica plate, the temperature of the bimetal 58 will rise rapidly and the bending deformation will begin quickly, so even if a high-temperature operating type bimetal 58 is used, the necessary It is difficult to secure lock time.

Moreover, by using a high temperature operating type bimetal 58, the bimetal 58 can react accurately to the heating temperature of the heater 59 without being affected by the ambient temperature (room temperature). In addition, since the heater 59 is provided with a heat radiation part 67, after the first bread baking is completed (the timer switch is turned off), the high heat retained in the heater 59 is quickly released.
The residual heat of the bimetal 58 can be made equal to the temperature of the atmosphere at the location where the control device 24 is installed (it goes without saying that this atmospheric temperature has a certain correspondence with the temperature inside the refrigerator). In this case, since the heat dissipation part 67 is arranged on the side of the connection part with the bimetal 58, a part of the residual heat of the bimetal 58 is also transferred to the connection part 6.
Since the residual heat of the bimetal 58 is radiated from the heat radiating portion 67 through the heat sink 67, the residual heat of the bimetal 58 can be quickly brought to the same temperature as the ambient temperature. Incidentally, when the heat dissipation section 67 is provided on the side opposite to the connection section with the bimetal 58, the heater 59
Due to the high retained heat of the bimetal 58, conduction of the residual heat of the bimetal 58 to the heat dissipation part 67 is prevented, and therefore the release of residual heat of the bimetal 58 is delayed. and,
In this way, after bread baking is completed, the heat held in the heater 59 and the bimetal 58 can be quickly released, and the temperature drop in the bimetal 58 can be made to follow the fall in the temperature inside the refrigerator. By that,
When baking for the second time in a row, door 2
Bimetal 5
It is possible to prevent the temperature of No. 8 from being maintained high. Therefore, during the second baking, if the internal temperature has dropped considerably, the timer lock operation disappears early and the winding operation of the timer 26 is started, resulting in insufficient time to energize the cooking heater. This can be prevented. Of course, when the opening time of the door 22 is very short and the internal temperature is maintained high,
When baking bread for the second time, the ambient temperature around the timer lock mechanism 28 is naturally high, and therefore the temperature drop of the bimetal 58 due to heat radiation through the heat radiation part 67 is small, so the timer 26 is quickly rewound. The operation is started and bread baking is performed. As described above, the bimetal 58 is a high-temperature operating type and quickly reaches the same temperature as the ambient temperature, and as mentioned above, the necessary locking time can be secured, so that it can be used even if the ambient temperature differs due to regional differences. This increases the reliability of baking to the same color regardless of the color. In addition, the heater 5
9 are connected and supported by the bimetal 58, their positional relationship can be maintained substantially constant regardless of the deformation of the bimetal 58. Therefore, bimetal 58
It is not necessary to attach the heater 59 in consideration of the amount of deformation of the heater 59, and since the heaters 59 and 58 can be attached to the device board 29 as a single unit, assembly can be performed easily.

Although the above-mentioned embodiment is constructed as described above, in implementing the present invention, specific structures such as a timer, a locking member, a browning adjustment mechanism, a bimetal, a control section, a heater, a heat dissipation section, etc. The shape, position, material, etc. are not limited to the above example.
Of course, it can be configured and implemented in various ways.

[Effect of idea]

Since the present invention described above has the configuration described in the above-mentioned utility model claims, a single bimetal is operated by a heater, and the control section of this bimetal can directly control the locking member of the timer. Therefore, unlike the conventional case, two bimetals are not required, and the conduction system from the bimetal part to the lock member can be omitted, so the structure of the timer lock mechanism can be simplified. In addition to this, since the bimetal and the heater are integrally connected, assembly can be simplified. Furthermore, there is no need for two bimetals as in the past,
Moreover, as mentioned above, since the number of parts is small, the adjustment work of the timer lock mechanism can be facilitated. Moreover,
Since the bimetal is of a high temperature operating type and the heater that heats it extends in the length direction of the bimetal and is disposed along and near the bimetal to heat the bimetal, a desired timer lock time can be easily obtained, and As described above, since the heater is integrally connected and supported to the bimetal, the bimetal can be heated by the heater while the position of the heater relative to the bimetal does not change significantly despite the deformation of the bimetal. The above timer lock time can be obtained accurately. In addition, the bimetal is a high-temperature operating type, so it is almost unaffected by ambient temperature (room temperature).
In addition, the heat dissipation part provided in the heater and connected to the bimetal in a thermally conductive manner can quickly bring the bimetal to the same temperature as the ambient temperature, and in addition, the locking time can be secured, so that the difference in room temperature can be reduced. It has the effect of increasing the reliability of continuously baking bread, etc., to the same color regardless of the baking time.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a conventional timer lock mechanism. Figures 2 to 9 show one embodiment of the present invention, Figure 2 is a perspective view, Figure 3 is a perspective view of the control device, Figure 4 is a front view of the control device, and Figure 5 is a timer knob. Vertical side view of the mounting part, Figure 6 is in Figure 5 -
7 is an exploded perspective view of the timer knob mounting portion, FIG. 8 is a side view of the timer lock mechanism, and FIG. 9 is a perspective view of the timer lock mechanism. 26... Timer, 27... Browning adjustment mechanism, 28
...Timer lock mechanism, 33...Lock member, 5
8... Bimetal, 58a... Control section, 59...
Heater, 60... Spring, 66... Connection portion, 67...
...heat dissipation section.

Claims (1)

[Scope of claim for utility model registration] A mechanical timer that turns on and off electricity to a cooking heater;
A cooking device that is equipped with a timer lock mechanism that controls a lock member that stops the timer operation, and a browning adjustment mechanism that interlocks and winds up the timer, thereby enabling continuous and even browning cooking. The timer lock mechanism includes a high-temperature-operating bimetal having a control section at one end that can constantly bias the locking member and move it into and out of contact with the locking member; and a heater disposed along and near the cooking heater and energized together with the cooking heater to energize the bimetal, one end of the heater heating the bimetal being thermally conductive and integral with the bimetal. A cooking appliance characterized in that the heater is cantilever-supported on the bimetal by being connected to each other, and a heat radiating part is provided at one end of the heater on the connection side.