JPH03286717A - Motor-driven toaster - Google Patents

Abstract

PURPOSE:To automatically take out bread after toasting it by turning on a first relay switch, when a prescribed toast time elapses, driving a motor for a prescribed time, moving a bread tray to the upper position, and also, turning off a second and third relay switches in connection with its movement, and disconnecting both ends of a heater, respectively. CONSTITUTION:When a switch 47 is turned on by a turning arm 41 which reaches the bottom dead center, a control circuit 63 discontinues magnetic driving of a first relay 65 and stops a motor 39, and a first timer 63a is actuated. When a prescribed toast time by the first timer 63a elapses, the control circuit 63 executes magnetic driving of a first relay 65 again and drives to rotate the motor 39 in the necessary direction, and a second timer 63b is actuated. Subsequently, when the switch 47 is turned off by the turning arm 41 which turns from the bottom dead center to the top dead center, the control circuit 63 discontinues magnetic driving of a second and a third relays 67, 69 and turns off the corresponding respective second and third relay switches 59, 61, respectively, and disconnects both the end parts of heaters 7, 9, respectively.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an electric toaster that automatically takes out bread after toasting it.

BACKGROUND OF THE INVENTION In a conventional toaster, when an operating lever is pushed down against the elastic force of an elastic member, a bread tray on which bread is placed is moved to a lower position. At this time, the bread tray or the operating lever is locked by the locking member and held in the depressed state, and the heater is energized to toast the bread. When a predetermined toasting time has elapsed, the bread tray or the operating lever is unlocked by the locking member, the bread tray is pushed up by the elastic force of the elastic member, and the power to the heater is cut off.

[Problem to be solved by the invention]

However, the above-mentioned conventional toaster had poor operability because the operating lever had to be pushed down with a strong force that resisted the elastic force of the elastic member every time bread was toasted. Further, when a large external force is applied to the main body when the bread tray or the operating lever is locked, there is a risk that the locked state will be released by this external force and the bread tray will be moved to the upper position. In such a case, in order to continue toasting, the control lever must be pressed down again.
The timer is restarted by pressing down on the control lever. However, since the heater itself has become hot due to previous energization, there is a problem that the bread may be toasted excessively. Furthermore, according to electrical safety standards for toasters, when the bread tray moves to the upper position, it is necessary to cut off the power to the heater and disconnect both ends of the heater. In this case, it is necessary to provide two switches that turn on or off when the bread tray or control lever is pressed down, but due to electrical insulation, each switch must be placed a certain distance apart, and the toaster As the size itself increased, the structure became more complex. The present invention was invented to solve the above-mentioned conventional drawbacks, and its purpose is to automatically toast bread by simply operating a start switch, and then
The purpose of the present invention is to provide a new electric toaster that can be taken out. Another object of the present invention is to provide an electric toaster that can reliably continue toasting even when an external force is applied to the main body during toasting. Furthermore, another object of the present invention is to provide an electric toaster with high safety by reliably disconnecting both ends of the heater when the bread tray moves to the upper position.

[Means to solve the problem]

Therefore, the invention of claim 1 is provided with a bread tray that moves vertically between a pair of opposing nets whose lower ends are rotatably supported between a pair of opposing heaters as driven by an electric motor. In the electric toaster, a switch member that is turned on when the bread tray is moved to a lower position, and a relay switch on the east side connected to the electric motor;
a second and a third connected in series to respective ends of the heater;
O by operating the relay switch and start switch.
When the bread tray is moved to the lower position by driving the electric motor with the first relay switch that is activated in the N state, the first relay switch is activated in the OFF manner based on a signal from the switch member that is activated in the ON state to drive the electric motor. After interrupting the process and turning on the second and third relay switches to conduct electricity between both ends of the heater and heating it with electricity,
When the predetermined toasting time has elapsed, the first relay switch is turned on to drive the electric motor for a predetermined time to move the bread tray to the upper position, and the switch is turned off as the bread tray moves. The electric toaster is characterized by comprising a control means that turns off the second and third relay switches to disconnect both ends of the heater, respectively. Further, the invention according to claim 2 is provided with a bread tray that moves in the vertical direction between a pair of opposing mesh bodies, the lower end of which is rotatably supported between a pair of opposing heaters, as driven by an electric motor. In the electric toaster, a switch member that is turned on when the bread tray is moved to a lower position;
The electric motor is controlled by a first relay switch connected to the electric motor, second and third relay switches connected in series to each end of the heater, and a first relay switch that is turned on when the start switch is operated. When the bread tray is moved to the lower position by driving the switch member, the first relay switch is turned OFF based on a signal from the switch member that is turned ON to interrupt the driving of the electric motor, and the second and third relays are turned OFF. After turning on the switch to conduct electricity and heating both ends of the heater, when a predetermined toast time has elapsed, turn on the first relay switch to drive the electric motor for a predetermined time. The electric toaster is characterized by comprising a control means that moves the bread tray to the upper position and turns off the second and third relay switches to disconnect both ends of the heater, respectively.

[Action of the invention]

In the invention of claim 1 configured as described above, when the start switch is operated after bread is placed on the bread tray, the first relay switch is turned on and the electric motor is rotationally driven. This moves the bread tray downward. When the bread tray reaches the lower position, the switch member in contact with the bread tray is turned ON, and the first relay switch is turned OFF, interrupting the rotational drive of the electric motor and connecting it to both ends of the heater. The second and third relay switches are turned on. This connects the heater to the power source, and the heater that generates electricity toasts the bread on the bread tray. When the predetermined toasting time has elapsed, the first relay switch is turned ON again, the electric motor is driven to rotate, and the bread tray is moved from the lower position toward the upper position. At this time, both ends of the heater are disconnected by the second and third relay switches, which are turned off in response to a signal from a switch member that is turned off as the bread tray moves, and the power to the heater is cut off. When the electric motor is driven for a predetermined period of time, the first relay switch is turned off and the rotational drive is interrupted. As a result, the bread tray is stopped and held in the upper position. Further, in the invention according to claim 2, when the start switch is operated after the bread is placed on the bread tray, the first relay switch is turned on and the electric motor is rotationally driven. This moves the bread tray downward. When the bread tray reaches the lower position, the switch member in contact with the bread tray is turned ON, and the first relay switch is turned OFF, interrupting the rotational drive of the electric motor and connecting it to both ends of the heater. The second and third relay switches are turned on. This connects the heater to the power source, and the heater that generates electricity toasts the bread on the bread tray. When the predetermined toasting time has elapsed, the first relay switch is turned ON again, the electric motor is driven to rotate, and the bread tray is moved from the lower position toward the upper position. It also turns off in synchronization with the first relay switch.
The actuated second and third relay switches disconnect both ends of the heater, respectively, and cut off electricity to the heater. When the electric motor is driven for a predetermined period of time, the first relay switch is turned off and the rotational drive is interrupted. As a result, the bread tray is stopped and held in the upper position.

【Example】

Hereinafter, the present invention will be explained according to examples. Example 1 First, the invention of claim 1 will be explained in detail. The second engineering drawing is a perspective view of the road body showing the outline of the electric toaster.
The figure is a perspective view showing the vertical drive mechanism of the bread tray. The main body frame 3 of the electric toaster 1 is formed by bending a metal plate into a box shape, and has a charging opening 5 on its upper end surface.
is formed. Inside the main body frame 3, there are a pair of heaters 7 facing each other with a required interval (only one heater 7 is shown in FIG. 1, and both heaters 7 and 9 are shown in FIG. 3).
) are installed along the front and back plates of the unit in an electrically insulated manner. In addition, lower end shafts of a pair of mesh bodies 11 and 13 facing each other with a required interval are rotatably supported within the main body frame 3 in a non-contact state with the heater 7. This net body 11・
The upper end shafts 11a and 13a of 13 slide through long holes 15b provided in one side plate 15 (only the front long holes are shown in FIG. 1) and move toward or away from each other. It is supported as such. Support plates 17a and 1.7b are attached to the outer surface of the side plate 15 at predetermined intervals in the vertical direction.
In a and 17b, there is a support shaft 19 having an axis in the vertical direction.
It is attached so that its lower end reaches the bottom plate 21 of the main body frame 3. A substantially triangular cam body 23 is supported on the support shaft 19 between the support plates 17a and 17b so as to be movable in the axial direction, and the cam body 23 has cam holes 23a and 23a.
23b is formed along the oblique side. And these cam holes 23a and 23b have net body kings 1 and 1.
The upper end shafts 11a-13a of No. 3 are supported in a slidable manner. Support shaft 1 located between support plate 17b and cam body 23
A compression spring 25 is attached to 9, and the elasticity of this compression spring 25 constantly urges the cam body 23 upward. Further, on the support shaft 19 located below the support plate 17b, an actuation block 27 and a push-down plate 2 as an abutment member are provided.
9 is supported slidably in the axial direction, and at both ends of the push-down plate 29 are tension springs 3 whose one ends are hooked to the cam body 23.
The other ends of 1 and 33 are hooked, respectively. When these tension springs 31 and 33 are pulled by the movement of the push-down plate 29 and their elastic force exceeds that of the compression spring 25,
The cam body 23 is moved downward. A bread tray 35 is attached between the heaters 7 and 9 and extends horizontally with one end attached to the actuation block 27. A standing plate 37 is attached to the bottom plate 21, and an electric motor 39 is attached to the plate 37. A rotating arm 41 as a rotating member is attached to the rotating shaft of the electric motor 39, and the other end of a crank lever 43 has one end rotatably supported by the actuation block 27 at one end of the rotating arm 41. is rotatably supported. Furthermore, an abutting piece 41a is provided at one end of the rotating arm 41. Then, the switch 47 is installed on the plate 37,
The turning arm 41 is mounted so as to be turned ON when the rotating arm 41 is rotated to the vertical position and the crank lever 43 is pushed down to the bottom dead center. A main body case 51 molded from heat-resistant resin is attached to the main body frame 3, and a charging opening 51a is formed in the upper end surface of the main body case 51 so as to communicate with the charging opening 5. Furthermore, a start switch 53 and a toast time setting switch 55 are provided at the front lower part of the main body case 51. FIG. 3 is an electrical block diagram of the electric toaster. A first relay switch 5 connected in series between the AC power sources
7 and an electric motor 39 are connected. Similarly, heaters 7 and 9 are connected between the AC power sources, and second and third relay switches 59 and 61 are connected in series to both ends of the heaters 7 and 9, respectively.
are connected to the control circuit 63, and the first to third
Relays 65, 67, and 69 are connected, respectively. Further, a switch 47 is connected to the control circuit 63 to detect that the rotating arm 41 has moved to the bottom dead center. Further, a start switch 53 and a setting switch 55 are connected to the control circuit 63, respectively, and the start switch 53 is set to OFF.
When N is operated, the control circuit 63 magnetically drives the first relay 65 to turn on the corresponding first relay switch 57.
When activated, the electric motor 39 is driven to rotate. Further, when the rotating arm 41 moves to the bottom dead center with the drive of the electric motor 39 and the switch 47 is turned on, the control circuit 63 interrupts the magnetic drive of the first relay 65 and At the same time as the switch 57 is turned off, the second and third relays 67 and 69 are magnetically driven, and the corresponding second and third relay switches 59 and 61 are turned on and the first timer 63a is activated. Activate it. When the first timer 63a counts a predetermined toast time, the control circuit 63 magnetically drives the corresponding first relay 65, turns on the first relay switch 57, and rotates the electric motor 39. At the same time the second
The timer 63b is activated. The rotating arm 4 is driven by an electric motor 39 that rotates the rotating arm 4.
1 rotates and the switch 47 is turned off, the control circuit 63 interrupts the magnetic drive of the second and third relays 67 and 69 based on the signal from the switch 47, and switches the second and third relays 67 and 69 off. Turn off relay switches 59 and 61. Next, when the second timer 63b counts a predetermined time, the control circuit 63 interrupts the magnetic drive of the first relay 65 and turns off the first relay switch 57. This predetermined time is set to a time period in which the rotating arm 4 moves from the bottom dead center to the top dead center as the electric motor 39 is driven. Note that when the setting switch 55 is operated, the control circuit 6
3 increments or decrements the set value of the second timer 63b. Next, the operation of the electric toaster constructed as described above will be explained with reference to FIGS. 2, 4, and 5. 4 and 5 are explanatory diagrams showing the operation. When the start switch 53 is turned off, the rotating arm 41 is moved to the top dead center as shown in FIG. 2, and the switch 47 is turned off. Furthermore, as described above, since the rotating arm 41 on which the crank lever 43 is supported has been moved to the upper position, the actuation block 27 has been moved to the upper position and the bread tray 35 has been moved to the loading position. Further, since the push-down plate 29 is not pushed down by the operating block 27 that has moved to the upper position, the cam body 23 is pushed upward by the elastic force of the compression spring 25. As a result, the upper end shafts 11a and 13a are connected to the cam hole 2.
Since it has been moved to the lower end side of 3a and 23b, the mesh body 11
・The upper ends of the toasters 13 are spaced apart from each other by a width that allows the bread to be toasted to be placed therein. In the above state, when the start switch 53 is turned ON after bread to be toasted is placed on the bread tray 35, the control circuit 63 magnetically drives the first relay 65 to turn on the corresponding first relay switch. 57 is turned on to rotate the electric motor 39. As a result, the rotating arm 41 is rotated in a predetermined direction, and the actuating block 27 is rotated by the crank lever 43 supported by the rotating arm 41.
And the bread tray 35 is pushed down toward the toasting position. When the actuating block 27 is moved to a predetermined position, the elastic force of the tension springs 31 and 33 gradually increases as the actuating block 27 pushes down the push-down plate 29. When the elastic force of the tension springs 31, 33 exceeds the elastic force of the compression spring 25, the cam body 23 is moved downward by the elastic force of the tension springs 31, 33. As a result, as shown in FIG. 4, the nets 11 and 13 rotate in a direction in which their upper ends approach each other, and the upper ends of the bread placed on the bread tray 35 are held between them. Then, as shown in Fig. 5, the rotating arm 4 reaches the bottom dead center.
1, when the switch 47 is turned on, the control circuit 6
3 interrupts the magnetic drive of the first relay 65 by a signal from the switch 47, stops the electric motor 39, and starts the first timer 65a. In addition, the control circuit 6
3 magnetically drives the second and third relays 67 and 69 by a signal from the switch 47, turns on the corresponding second and third relay switches 59 and 61, and connects the heaters 7 and 9 to the AC power source. conduction between. As a result, the heaters 7 and 9 are energized and generate heat, and the bread tray 3
5. The bread above is toasted. Then, when the first timer 63a counts a predetermined toast time and ends the toast, the control circuit 63 again starts the first toast.
The relay 65 is magnetically driven to drive the electric motor 39 to rotate in a desired direction, and the second timer 63b is activated. When the switch 47 is turned off by the rotating arm 41 rotating from the bottom dead center toward the top dead center, the control circuit 63 interrupts the magnetic drive of the second and third relays 67 and 69. By turning off the corresponding second and third relay switches 59 and 61, the respective ends of the heaters 7 and 9 are disconnected. The bread tray 35 is moved toward the loading position by the operating block 27 that moves upward as the rotating arm 41 rotates, and when the operating block 27 is moved to a certain upper position, the operating block 27 pushes down the plate. 29 is released from the depressed state. As a result, when the elastic force of the tension springs 31 and 33 becomes weaker than the elastic force of the compression spring 25, the upper ends of the net bodies 11 and 13 are separated from each other by the cam body 23, which moves upward due to the elastic force of the compression spring 25. direction to release the toasted bread. When the first timer 63b counts a predetermined time, the control circuit 63 interrupts the magnetic drive of the first relay 65, stops the rotational drive of the electric motor 39, and controls the rotating arm 4.
1 is stopped at top dead center. Example 2 Next, the invention of claim 2 will be described in detail. The structure and electrical configuration of the second embodiment are similar to those of the first embodiment, but the control function of the control circuit 63 is different. In addition,
Since the electrical block diagram of the second embodiment is the same as that of the first embodiment, in the description of the second embodiment, the control circuit will be designated by reference numeral 63 and its control function will be explained. When the start switch 53 is turned on, the control circuit 63 magnetically drives the first relay 65 and turns on the first relay switch 57 to rotationally drive the electric motor 39. As a result, the rotating arm 4 rotates in a predetermined direction.
1, the bread tray 35 is pushed down. When the rotating arm 41 reaches the bottom dead center, the control circuit 63 interrupts the magnetic drive of the first relay 65 by a signal from the switch 47, which is turned on by contact with one end of the rotating arm 41. The second and third relays 67 and 69 are magnetically driven to turn on the corresponding second and third relay switches 59 and 61, respectively. Further, at the same time as the second and third relays 67 and 69 are magnetically driven, the control circuit 63 starts the first timer 63a. This connects both ends of heaters 7 and 9 and AC
The power supply generates electricity and heats, and the bread on the bread tray 35 is toasted. Then, when the first timer 63a counts a predetermined toast time, the control circuit 63 controls the first timer 63a. The relay 65 is magnetically driven to turn on the I-th relay switch 57 and start the second timer 63b. Further, when the first timer 63a counts a predetermined time, the control circuit 63a
interrupts the magnetic drive of the second and third relays 67 and 69 and switches the corresponding second and third relay switches 59 and 6.
Turn 1 off. As a result, the rotating arm 41 is rotated toward the top dead center by the electric motor 39 that is rotationally driven. Further, both ends of the heaters 7 and 9 are disconnected, and the current supply is cut off. The second timer 63b is set to the time required for the rotary arm 41 to move from the bottom dead center to the top dead center, and when the second timer 63b counts a predetermined time, the control circuit 63
The magnetic drive of the relay 65 is interrupted. As a result, the rotational drive of the electric motor 39 is interrupted, and the bread tray 35 is stopped and held at the upper position. The above explanation applies when the switch 47 is turned on as the rotating arm 41 moves from the top dead center to the bottom dead center, and when the first timer 63a counts a predetermined time or when the rotating arm 41 is lowered. When the switch 47 is turned off by moving from the dead center to the top dead center, the second and third relays 67 and 69 are configured to magnetically drive or interrupt the magnetic drive, respectively. Third
For example, the relays 67 and 69 are connected to one circuit consisting of two circuits and four contacts.
It may be composed of several relays.

[Effects of the Invention] Therefore, the present invention can provide an electric toaster that can automatically toast bread and then take it out by simply operating the start switch. Further, the present invention can provide an electric toaster that can reliably continue toasting even when an external force is applied to the main body during toasting. Furthermore, the present invention can provide a highly safe electric toaster by reliably disconnecting both ends of the heater when the bunt tray moves to the upper position.

[Brief explanation of drawings]

Figure 1 is a perspective view of the road body schematically showing the electric toaster;
FIG. 3 is an electrical block diagram of the electric toaster, and FIGS. 4 and 5 are explanatory views showing the operation of the electric toaster. In the diagram, 1 is an electric toaster, 7 and 9 are heaters 11 and 13
35 is a pan tray, 41 is a rotating arm as a rotating member, 47 is a switch, 57 is a first relay switch, 59 is a second relay switch, 61 is a third relay switch, 63 is a control It is a circuit.

Claims (1)

[Scope of Claims] 1. A bread tray that moves vertically between a pair of opposing nets whose lower ends are rotatably supported between a pair of opposing heaters as driven by an electric motor. The electric toaster includes a switch member that is turned on when the bread tray is moved to a lower position, a first relay switch connected to the electric motor, and second and third relay switches connected in series to respective ends of the heater.
When the pan tray is moved to the lower position by driving the electric motor by the first relay switch which is turned ON by operating the start switch, the first relay is turned ON based on the signal from the switch member which is turned ON. After the switch is turned OFF to interrupt the driving of the electric motor and the second and third relay switches are turned ON to conduct electricity and heat the heater, when a predetermined toasting time has elapsed, the second and third relay switches are turned ON. The first relay switch is turned on and the electric motor is driven for a predetermined period of time to move the bread tray to the upper position, and the second and third relay switches are turned off by a switch that turns off as the bread tray moves. An electric toaster equipped with a control means that operates to disconnect both ends of the heater. 2. In an electric toaster equipped with a bread tray that moves vertically between a pair of opposing nets whose lower ends are rotatably supported between a pair of opposing heaters as driven by an electric motor, the bread tray is a switch member that is turned on when moved to a lower position; a first relay switch connected to the electric motor; and second and third relay switches connected in series to respective ends of the heater.
When the pan tray is moved to the lower position by driving the electric motor by the first relay switch which is turned ON by operating the start switch, the first relay is turned ON based on the signal from the switch member which is turned ON. After the switch is turned OFF to interrupt the driving of the electric motor and the second and third relay switches are turned ON to conduct electricity and heat the heater, when a predetermined toasting time has elapsed, the second and third relay switches are turned ON. Control that turns on the first relay switch and drives the electric motor for a predetermined time to move the bread tray to the upper position, and turns off the second and third relay switches to disconnect both ends of the heater, respectively. An electric toaster with means and.