A timing insurance device and a toaster having the timing insurance device

Abstract

The present invention discloses a timing insurance device and a toaster having the timing insurance device, which includes a housing, a motor, a driving gear, a microswitch, a timing mechanism and a push rod; the driving gear is sleeved on the output shaft of the motor, and the microswitch includes a button; the timing mechanism is installed in the housing in a directionally slidable manner, and includes a gear box, a driven gear and a dial block. A guiding groove is provided on the lower surface of the driven gear, and the inner side wall of the guiding groove has a notch; the dial block is located below the driven gear, its upper end is placed in the guiding groove and its lower end is located above the button of the microswitch; when the upper end of the dial block abuts against the inner wall of the guiding groove, the dial block presses down the button of the microswitch, and the microswitch is in a closed state; when the upper end of the dial block is at the notch position, the button of the microswitch pushes the dial block to tilt upward, and the microswitch is in an open state; the push rod is used to push or tilt the timing mechanism close to the motor, so as to realize timing control through a mechanical structure.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and particularly to a timing insurance device and a toaster having the timing insurance device. Background Art

[0002] A toaster, also known as an automatic bread toaster or bread roaster in English, is an electric cooking utensil specifically used for re-baking sliced bread. In existing toasters, the lifting control block is usually pressed down along the guide shaft to control the closing of the switch elastic sheet, so that the electromagnet is energized to attract and hold the lifting control board to stably press the switch elastic sheet, realizing the stable operation of toasting bread. At the same time, the working time of the toaster is controlled by a circuit board, generally by pre-selecting different gears. When the working time reaches, the circuit board controls the electromagnet to cut off the power. Then, the suction force of the electromagnet disappears, the lifting control block moves upward and resets, and the switch elastic sheet disconnects, ending the work and waiting for the next toasting to achieve the effect of electrical control of the circuit board. However, the electrical control method is relatively less stable. During daily use, the circuit board control often fails, resulting in the toaster being unable to stop and continuously working, leading to accidents and danger, and there is room for improvement. Summary of the Invention

[0003] The present invention is to overcome the above-mentioned defects in the prior art and provides a timing insurance device. The motor drives the driving gear to rotate at a constant speed, and the driven gear meshes with the driving gear and rotates under the action of the ejector rod. The upper end of the dial block abuts against the inner wall of the guiding groove and slides. When it slides to the notch of the groove, the dial block tilts, and the micro switch disconnects, thus playing a role of timing insurance. At the same time, a toaster having the timing insurance device is provided.

[0004] To achieve the above object, the present invention provides a timing insurance device, which is characterized in that it includes a housing, and a motor, a driving gear, a micro switch, a timing mechanism and an ejector rod installed in the housing.

[0005] Among them, the motor and the micro switch are respectively fixedly installed at a first predetermined position and a second predetermined position of the housing. The driving gear is sleeved on the output shaft of the motor. The micro switch includes a button.

[0006] The timing mechanism is installed in the housing so as to be capable of directional sliding, and includes a gear box, at least one driven gear rotatably and fixedly installed in the gear box and meshing with each other for transmission, and a dial block pivotally installed on the gear box. At least one driven gear includes a primary driven gear meshing with the driving gear and a final driven gear located at the end of the transmission. The lower surface of the final driven gear is provided with an arc-shaped or circular guiding groove, and the inner side wall of the guiding groove has a notch.

[0007] The shifting block is located below the final driven gear. The upper end of the shifting block is placed in the guiding groove and its lower end is always above the button of the microswitch. When the upper end of the shifting block abuts against the inner wall of the guiding groove, the shifting block presses down the button of the microswitch and the microswitch is in the closed state. When the upper end of the shifting block is at the notch position, the button of the microswitch pushes the shifting block to tilt upward and the microswitch is in the open state.

[0008] The ejector rod is used to push or tilt the timing mechanism close to the motor so as to realize the meshing transmission between the primary driven gear and the driving gear.

[0009] It is further set that: a through hole for an external object to extend in and press the shifting block is provided on the housing corresponding to the shifting block.

[0010] It is further set that: a first return spring is also provided and abuts between the motor and the gearbox. This first return spring is used to push the timing mechanism away from the motor.

[0011] It is further set that: a torsion spring for providing a turning force to the driven gear is also included.

[0012] The present invention also provides a toaster, which includes a control circuit board, a lifting control block and a timing insurance device. The control circuit board includes a timing module, a switch spring piece and an electromagnet. The timing insurance device is installed on the control circuit board.

[0013] The lifting control block can slide in a fixed direction to press the switch spring piece to make it closed. At the same time, during the sliding process, the lifting control block pushes the ejector rod so that the ejector rod pushes or tilts the timing mechanism in the timing insurance device close to the motor and when the timing mechanism presses the switch spring piece, the primary driven gear and the driving gear are stably meshed for transmission.

[0014] The electromagnet is used to generate a magnetic force after being powered on to attract the lifting control block so that it stably presses the switch spring piece and the ejector rod.

[0015] The switch spring piece is electrically connected to the timing module, the electromagnet, the microswitch and the motor to control the on-off of the timing module, the electromagnet, the microswitch and the motor.

[0016] The timing module is at least electrically connected to the electromagnet and controls the electromagnet to cut off the power supply after a preset time by receiving the set time.

[0017] The microswitch is at least electrically connected to the electromagnet to control the power-off of the electromagnet.

[0018] It is further set that: a guide shaft is also included. The lifting control block is sleeved on the guide shaft and can slide in a fixed direction along the guide shaft. A second return spring is also sleeved on the guide shaft.

[0019] Compared with the prior art, the timing insurance device of the present invention realizes timing control through a mechanical transmission structure, and its stability is much higher than that of electrical control, thus achieving a better timing insurance effect; at the same time, a toaster with the timing insurance device is provided, greatly improving the working stability of the toaster and greatly reducing the possibility of accidents occurring after electrical timing control. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic perspective view of a timing insurance device of the present invention;

[0021] Figure 2 is a schematic view of the structure of the timing insurance device after removing the upper housing;

[0022] Figure 3 is a schematic view of the separated structure of the timing insurance device;

[0023] Figure 4 is a schematic view of the mating structure of the shifting block and the driven gear;

[0024] Figure 5 is a schematic view of the structure of the toaster;

[0025] Figure 6 is a schematic diagram of the electrical connections of the components on the control circuit board.

[0026] With reference to the accompanying drawings, the following reference numerals are marked thereon:

[0027] 100, timing insurance device; 1, housing; 11, upper housing; 111, through hole; 12, lower housing; 2, motor; 3, driving gear; 4, timing mechanism; 41, gear box; 411, upper box body; 412, lower box body; 42, driven gear; 421, guiding groove; 422, notch; 43, shifting block; 431, upper end abutting portion; 432, lower end pressing portion; 433, rotating shaft portion; 5, ejector rod; 51, ejector rod spring; 6, first return spring; 7, torsion spring; 8, micro switch; 81, button;

[0028] 200, lifting control block; 201, elastic piece acting portion; 202, ejector rod acting portion; 300, guide shaft; 400, control circuit board; 401, switch elastic piece; 402, electromagnet; 403, timing module; 500, second return spring. DETAILED DESCRIPTION OF THE INVENTION

[0029] The following will describe in detail a specific embodiment of the present invention with reference to the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiment.

[0030] A timing insurance device of the present invention is as Figures 1 to 3As shown in the figure, it includes a housing 1, and a motor 2, a driving gear 3, a timing mechanism 4, a microswitch 8, a push rod 5, a first return spring 6 and a torsion spring 7 arranged inside the housing 1; among them, the motor 2 and the microswitch 8 are respectively fixedly installed at a first predetermined position and a second predetermined position of the housing 1, the driving gear 3 is fixedly sleeved on the output shaft of the motor 2 to output torque, and the microswitch 8 includes a button 81 for controlling opening and closing; the timing mechanism 4 is installed in the housing 1 in a directionally slidable manner, and the push rod 5 is used to push or lever the timing mechanism 4 close to the motor 2, so that the driven gear 42 of the timing mechanism 4 meshes with the driving gear 3 to achieve transmission, and at the same time when the timing mechanism 4 receives a predetermined torque, it can control the microswitch 8 to disconnect, so as to play a protective role; the first return spring 6 is abutted between the motor 2 and the timing mechanism 4, and is used to push the timing mechanism 4 away from the motor 2, so that the driven gear 42 of the timing mechanism 4 is in a separated state from the driving gear 3 when no external force is applied; the torsion spring 7 is used to provide a turning force for the driven gear 42, so that the driven gear 42 is in an initial state when no external force is applied, so as to be used normally next time.

[0031] Specifically, as Figures 2 to 4As shown, the housing 1 is formed by mating an upper housing 11 and a lower housing 12; the timing mechanism 4 includes a gear box 41, at least one driven gear 42 rotatably and positioned and installed inside the gear box 41 and meshing with each other for transmission, and a toggle block 43 pivotally installed on the gear box 41. Among them, the gear box 41 is formed by mating an upper box body 411 and a lower box body 412, and clamping and fixing at least one driven gear 42 inside the gear box 41; among them, at least one driven gear 42 includes a primary driven gear 42 meshing with the driving gear 3 for transmission and a final driven gear 42 at the end of the transmission. The lower surface of the final driven gear 42 is provided with a guide groove 421 in an arc shape or a circular ring shape, and the inner wall of the guide groove 421 has a notch 422. In this embodiment, the number of driven gears 42 in the gear box 41 is one, that is, the primary driven gear 42 and the final driven gear 42 are the same; the toggle block 43 is installed below the final driven gear 42, and includes an upper end abutting portion 431, a lower end pressing portion 432 and a rotating shaft portion 433. The toggle block 43 is rotatably installed on the gear box 41 through the rotating shaft portion 433 and pivots along the rotating shaft portion 433. The upper end abutting portion 431 is arranged in the guide groove 421 of the driven gear 42, and the lower end pressing portion 432 is always located above the micro switch 8; when the upper end abutting portion 431 abuts against the inner wall in the guide groove 421, the lower end pressing portion 432 of the toggle block 43 presses on the button 81 of the micro switch 8 to make the micro switch 8 in a closed state; when the final driven gear 42 rotates under the driving of the driving gear 3 and the upper end abutting portion 431 is located at the notch 422 position, due to the lack of the limiting effect of the inner wall, the button 81 of the micro switch 8 can push the toggle block 43 to rotate, so that the micro switch 8 is disconnected. In this way, by controlling the constant output speed of the motor 2 and the transmission ratio between the driving gear 3 and at least one driven gear 42, the time for the upper end abutting portion 431 of the toggle block 43 to move from the initial position to the notch 422 position can be controlled, so as to control the time for the micro switch 8 to disconnect the circuit, thus playing a role of timing insurance.

[0032] In the above solution, preferably, a through hole 111 is provided in the upper housing 11 corresponding to the toggle block 43. Thus, when the upper end abutting portion 431 of the toggle block 43 moves to the notch 422 of the guide groove 421 and the toggle block 43 pivots upward to disconnect the micro switch 8, an external object passes through the through hole 111 to press the lower end abutting portion of the toggle block 43, and under the action of the torsion spring 7, the driven gear 42 can rotate and reset, and the timing mechanism 4 resumes working.

[0033] In the above solution, preferably, a push rod spring 51 is provided between the push rod 5 and the timing mechanism 4. Under the action of the push rod spring 51, it can ensure that the push rod 5 effectively resets when there is no external force.

[0034] The present invention also provides a toaster having the above timing insurance device 1, such asFigure 5 and Figure 6As shown in the figure, it includes a lifting control block 200, a guide shaft 300, a second return spring 500, a control circuit board 400, and a timing insurance device 1; among them, the lifting control block 200 includes a shrapnel acting part 201 and a push rod 5 acting part. The lifting control block 200 is sleeved on the guide shaft 300 and can slide up and down along the guide shaft 300; a switch shrapnel 401, an electromagnet 402, and a timing module 403 are arranged on the control circuit board 400, and the timing insurance device 1 is inserted on the control circuit board 400 to realize the electrical connection between the two; by pressing the lifting control block 200 to move downward along the guide shaft 300, the shrapnel acting part 201 of the lifting control block 200 can press against the switch shrapnel 401 to make it closed, so that the main circuit of the toaster is in a closed state, and the toaster works to bake the panel. At the same time, the electromagnet 402 is energized to generate a magnetic force to stably attract the lifting control block 200 to this working position to ensure the stable operation of the toaster. The timing module 403 is powered on and the main circuit is disconnected after the set time. The motor 2 and the micro switch 8 of the timing insurance device 1 are also in the powered-on state; when the lifting control block 200 moves downward to press the switch shrapnel 401, the push rod acting part 202 of the lifting control block 200 acts on the push rod 5, so that the push rod 5 pushes or tilts the driven gear 42 of the timing mechanism 4 to mesh with the driving gear 3 for transmission, and the timing insurance device 1 works. Generally speaking, the timing time of the timing insurance device 1 is slightly longer than the set time of the timing module 403, that is, the time for the dial block 43 to move along the guide groove 421 and reach the notch 422 is greater than the set time of the timing module 403; thus, when the timing module 403 of the control circuit board works normally, the timing module 403 controls the main circuit to be disconnected after the set time, the toaster stops baking, the electromagnet 402 loses power, the lifting control block 200 moves upward along the guide shaft 300 under the action of the second return spring 500, the switch shrapnel 401 is disconnected again, the motor 2 is powered off and stops working, and under the action of the first return spring 6, the timing mechanism 4 moves away from the motor 2 so that the driving gear 3 is separated from the driven gear 42. At the same time, the driven gear 42 rotates reversely and resets under the action of the torsion spring 7, and the push rod 5 resets under the action of the push rod spring 51 for the next work; when the timing module 403 of the control circuit board 400 fails, the timing module 403 fails to disconnect the main circuit after the set time. At this time, the motor 2 continues to work normally until the notch 422 of the driven gear 42 rotates to the position of the dial block 43. The dial block 43 rotates under the action of the button 81 of the micro switch 8, the micro switch 8 is disconnected, the main circuit is disconnected, the toaster stops working, the electromagnet 402 loses power, and the lifting control block 200 moves upward, and the switch shrapnel 401 is disconnected again. However, at this time, the timing mechanism 4 cannot be automatically reset, and manual operation is required to reset the timing mechanism 4 of the timing insurance device 1, such as pressing the dial block 43 by an external object extending into the through hole 111 of the housing 1, and it rotates and resets under the action of the torsion spring 7 to resume work.

[0035] In the above solution, a toaster generally has multiple different working gears corresponding to different baking times. Thus, a timing insurance device 1 can be set for each working gear, so as to realize the timing insurance function for different gears and avoid accidents. At the same time, most of the gears of the toaster are of a knob or button structure. Thus, the corresponding timing insurance device 1 is controlled to electrically connect to the control circuit board 400 by rotating or pressing.

[0036] As Figure 6 shown, in this embodiment, the motor 2, the microswitch 8, the switch spring piece 401, the timing module 403 and the electromagnet 402 are connected in series. According to specific needs, a partially parallel connection method can also be adopted. The switch spring piece 401 controls the on-off of the main circuit, that is, the switch spring piece 401 controls the on and off of the motor 2, the microswitch 8, the timing module 403 and the electromagnet 402. The microswitch 8 at least controls the on and off of the electromagnet 402, and the timing module 403 at least controls the on and off of the electromagnet 402.

[0037] Compared with the prior art, the timing insurance device of the present invention realizes timing control through a mechanical transmission structure, and its stability is much higher than that of electrical control, thus achieving a better timing insurance effect. At the same time, a toaster with this timing insurance device is provided, which greatly improves the working stability of the toaster and greatly reduces the possibility of accidents occurring after electrical timing control.

[0038] The above-disclosed are only the embodiments of the present invention. However, the present invention is not limited thereto, and any changes that can be thought of by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A toaster, characterized in that, It includes a control circuit board, a lifting control block and a timing insurance device. The control circuit board includes a timing module, a switch spring piece and an electromagnet, and the timing insurance device is installed on the control circuit board; The timing insurance device includes a housing, and a motor, a driving gear, a microswitch, a timing mechanism and a push rod installed in the housing; Wherein, the motor and the microswitch are respectively fixedly installed at a first predetermined position and a second predetermined position of the housing. The driving gear is sleeved on the output shaft of the motor, and the microswitch includes a button; The timing mechanism is installed in the housing in a directionally slidable manner, and includes a gear box, at least one driven gear rotatably and positionedly installed in the gear box and meshing and driving with each other, and a dial block installed on the gear box in a pivotable manner. At least one driven gear includes a primary driven gear meshing and driving with the driving gear and a final driven gear at the end of the transmission. The lower surface of the final driven gear is provided with an arc-shaped or circular guide groove, and the inner side wall of the guide groove has a notch; The dial block is located below the final driven gear. The upper end of the dial block is placed in the guide groove and its lower end is always located above the button of the microswitch; when the upper end of the dial block abuts against the inner wall of the guide groove, the dial block presses down the button of the microswitch, and the microswitch is in a closed state; when the upper end of the dial block is at the notch position, the button of the microswitch pushes the dial block to pivot upward, and the microswitch is in an open state; The push rod is used to push or pivot the timing mechanism close to the motor to realize the meshing and driving of the primary driven gear and the driving gear; The timing insurance device further includes a first return spring disposed between the motor and the gear box, and the first return spring is used to push the timing mechanism away from the motor; The timing insurance device further includes a torsion spring for providing a rotational force to the driven gear; The lifting control block can slide directionally to press the switch spring piece to make it closed. At the same time, during the sliding process, the lifting control block pushes the push rod so that the push rod pushes or pivots the timing mechanism in the timing insurance device close to the motor, and when the primary driven gear and the driving gear are stably meshed and driven, the switch spring piece is pressed; The electromagnet is used to generate a magnetic force after being energized to attract the lifting control block to stably press the switch spring piece and the push rod; The switch spring piece is electrically connected to the timing module, the electromagnet, the microswitch and the motor to control the on and off of the timing module, the electromagnet, the microswitch and the motor; The timing module is at least electrically connected to the electromagnet, and controls the electromagnet to cut off the power after a predetermined time by receiving the set time; The microswitch is at least electrically connected to the electromagnet to control the power-off of the electromagnet.

2. The toaster according to claim 1, characterized in that, It further includes a guide shaft. The lifting control block is sleeved on the guide shaft and can slide directionally along the guide shaft. A second return spring is also sleeved on the guide shaft.

3. A toaster according to claim 1, wherein, The housing is provided with a through hole corresponding to the dial block for an external object to extend in and press the dial block.

Images