CN111248773A

CN111248773A - Timing safety device and toaster with same

Info

Publication number: CN111248773A
Application number: CN202010174705.0A
Authority: CN
Inventors: 孙文焕; 李建强
Original assignee: Ningbo Oupu Electric Appliance Co ltd
Current assignee: Ningbo Oupu Electric Appliance Co ltd
Priority date: 2020-03-13
Filing date: 2020-03-13
Publication date: 2020-06-09

Abstract

The invention discloses a timing safety device and a toaster with the same, wherein the timing safety device comprises a shell, a motor, a driving gear, a microswitch, a timing mechanism and an ejector rod; the driving gear is sleeved on an output shaft of the motor, and the microswitch comprises a button; the timing mechanism can be directionally and slidably arranged in the shell and comprises a gear box, a driven gear and a shifting block, wherein the lower surface of the driven gear is provided with a guide groove, and the inner side wall of the guide groove is provided with a notch; the shifting block is positioned below the driven gear, the upper end part of the shifting block is arranged in the guide groove, and the lower end part of the shifting block is positioned above the button of the microswitch; when the upper end part of the shifting block abuts against the inner wall of the guide groove, the shifting block downwardly abuts against a button of the microswitch, and the microswitch is in a closed state; when the upper end part of the shifting block is positioned at the notch position, a button of the microswitch pushes the shifting block to move upwards, and the microswitch is in a disconnected state; the ejector rod is used for pushing or lifting the timing mechanism to be close to the motor, and therefore timing control is achieved through a mechanical structure.

Description

Timing safety device and toaster with same

Technical Field

The invention relates to the technical field of household appliances, in particular to a timing safety device and a toaster with the same.

Background

Toaster, english name Toaster, China is called automatic slice Toaster and Toaster, it is a special electric heating cooking utensil for toasting slice bread again; the conventional toaster is usually controlled to be closed by pressing down the switch elastic sheet along the guide shaft through the lifting control block, so that the electromagnet is electrified to suck the lifting control plate to stably press the switch elastic sheet, the stable work of baking bread is realized, meanwhile, the working time of the toaster is controlled through the circuit board, the working time is generally realized by selecting different gears in advance, when the working time reaches, the circuit board controls the electromagnet to be powered off, the lifting control block moves upwards to reset after the suction force of the electromagnet disappears, the switch elastic sheet is disconnected, and the next baking is finished to achieve the effect of electrically controlling the circuit board; however, the electrical control mode is relatively poor in stability, and circuit board control failure often occurs in the daily use process, so that the toaster cannot stop, accidents are caused by continuous work, dangers are caused, and the improvement space is provided.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a timing safety device.A motor drives a driving gear to rotate at a constant speed, a driven gear is meshed with the driving gear to rotate under the action of a mandril, the upper end part of a shifting block slides against the inner wall of a guide groove, and when the shifting block slides to the notch, the shifting block is lifted, a microswitch is disconnected, so that the timing safety effect is realized; meanwhile, a toaster with the timing safety device is provided.

In order to achieve the aim, the invention provides a timing safety device which is characterized by comprising a shell, a motor, a driving gear, a microswitch, a timing mechanism and an ejector rod, wherein the motor, the driving gear, the microswitch, the timing mechanism and the ejector rod are arranged in the shell;

the motor and the microswitch are respectively and fixedly arranged on a first preset position and a second preset position of the shell, the driving gear is sleeved on an output shaft of the motor, and the microswitch comprises a button;

the timing mechanism can be directionally and slidably arranged in the shell and comprises a gear box, at least one driven gear which is rotatably positioned and arranged in the gear box and is in meshed transmission with one another, and a shifting block which is arranged on the gear box in a seesaw mode, wherein the at least one driven gear comprises a primary driven gear in meshed transmission with the driving gear and a final driven gear positioned at a transmission tail end, the lower surface of the final driven gear is provided with a circular arc or annular guide groove, and the inner side wall of the guide groove is provided with a notch;

the shifting block is positioned below the final-stage driven gear, the upper end of the shifting block is arranged in the guide groove, and the lower end of the shifting block is always positioned above the button of the microswitch; when the upper end part of the shifting block abuts against the inner wall of the guide groove, the shifting block downwardly abuts against a button of the microswitch, and the microswitch is in a closed state; when the upper end part of the shifting block is positioned at the notch position, a button of the microswitch pushes the shifting block to move upwards, and the microswitch is in a disconnected state;

the ejector rod is used for pushing or lifting the timing mechanism to be close to the motor so as to realize meshing transmission of the primary driven gear and the driving gear.

Further setting the following steps: and a through hole for a foreign object to extend into the jacking shifting block is formed in the position, corresponding to the shifting block, of the shell.

Further setting the following steps: still including contradicting the first reset spring who sets up between motor and gear box, this first reset spring is used for promoting the timing mechanism and keeps away from the motor.

Further setting the following steps: and a torsion spring for providing a rotary force to the driven gear.

The invention also provides a toaster, which comprises a control circuit board, a lifting control block and a timing safety device, wherein the control circuit board comprises a timing module, a switch elastic sheet and an electromagnet;

the lifting control block can slide directionally to press the switch elastic sheet to close, and meanwhile, the lifting control block pushes the ejector rod in the sliding process to enable the ejector rod to push or lift the timing mechanism in the timing safety device to approach the motor and stably mesh and transmit the primary driven gear and the driving gear when the ejector rod presses the switch elastic sheet;

the electromagnet is used for generating magnetic force after being electrified so as to attract the lifting control block to enable the lifting control block to stably jack the switch elastic sheet and the ejector rod;

the switch elastic sheet is electrically connected with the timing module, the electromagnet, the microswitch and the motor so as 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 with the electromagnet and controls the electromagnet to be powered off after preset time by receiving set time;

the micro switch is at least electrically connected with the electromagnet to control the power-off of the electromagnet.

Further setting the following steps: the lifting control block is sleeved on the guide shaft and can directionally slide along the guide shaft, and a second reset spring is further sleeved on the guide shaft.

Compared with the prior art, the timing safety device realizes timing control through a mechanical transmission structure, and the stability of the timing safety device is greatly higher than that of electric control, so that a better timing safety effect is achieved; meanwhile, the toaster with the timing safety device is provided, the working stability of the toaster is greatly improved, and the possibility of accidents after electrical timing control is greatly reduced.

Drawings

FIG. 1 is a schematic perspective view of a timing fuse in accordance with the present invention;

FIG. 2 is a schematic view of the timing fuse with the upper housing removed;

FIG. 3 is a schematic diagram of a separate construction of the timing fuse;

FIG. 4 is a schematic view of the engagement structure of the dial and the driven gear;

FIG. 5 is a schematic view of the structure of a toaster;

fig. 6 is a schematic diagram of the electrical connections of the components on the control circuit board.

The following reference numerals are marked thereon in conjunction with the accompanying drawings:

100. a timing safety device; 1. a housing; 11. an upper housing; 111. a via hole; 12. a lower housing; 2. a motor; 3. a driving gear; 4. a timing mechanism; 41. a gear case; 411. an upper box body; 412. a lower box body; 42. a driven gear; 421. a guide groove; 422. a notch; 43. shifting blocks; 431. an upper end abutting part; 432. a lower end pressing part; 433. a rotating shaft part; 5. a top rod; 51. a push rod spring; 6. a first return spring; 7. a torsion spring; 8. a microswitch; 81. a button;

200. a lifting control block; 201. a spring plate acting part; 202. a push rod action part; 300. a guide shaft; 400. a control circuit board; 401. a switch spring plate; 402. an electromagnet; 403. a timing module; 500. a second return spring.

Detailed Description

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the embodiment.

The timing safety device comprises a shell 1, a motor 2, a driving gear 3, a timing mechanism 4, a microswitch 8, a mandril 5, a first return spring 6 and a torsion spring 7, wherein the motor 2, the driving gear 3, the timing mechanism 4, the microswitch 8, the mandril 5, the first return spring 6 and the torsion spring 7 are arranged in the shell 1; the motor 2 and the microswitch 8 are respectively and fixedly arranged on a first preset position and a second preset position of the shell 1, the driving gear 3 is fixedly sleeved on an output shaft of the motor 2 to output torque, and the microswitch 8 comprises a button 81 for controlling opening and closing; the timing mechanism 4 can be installed in the shell 1 in a directional sliding manner, the ejector rod 5 is used for pushing or lifting the timing mechanism 4 to be close to the motor 2, so that the driven gear 42 of the timing mechanism 4 is meshed with the driving gear 3 to realize transmission, and meanwhile, the micro switch 8 can be controlled to be disconnected after the timing mechanism 4 receives a preset torque, so that a protection effect is achieved; the first return spring 6 is arranged between the motor 2 and the timing mechanism 4 in an abutting mode and used for pushing the timing mechanism 4 to be far away from the motor 2, so that the driven gear 42 of the timing mechanism 4 and the driving gear 3 are in a separated state when the timing mechanism is not influenced by external force; the torsion spring 7 is used to provide a rotational force to the driven gear 42, so that the driven gear 42 is in an initial state when not being subjected to an external force for the next normal use.

Specifically, as shown in fig. 2 to 4, the housing 1 is formed by joining an upper housing 11 and a lower housing 12; the timing mechanism 4 comprises a gear box 41, at least one driven gear 42 which is rotatably positioned and installed in the gear box 41 and is in meshing transmission with each other, and a shifting block 43 which is installed on the gear box 41 in a lifting way, wherein the gear box 41 is formed by combining an upper box 411 and a lower box 412, and at least one driven gear 42 is clamped and fixed in the gear box 41; wherein, at least one driven gear 42 includes a primary driven gear 42 engaged with the driving gear 3 for transmission, and a final driven gear 42 located at the transmission end, 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 is provided with a notch 422, in this embodiment, the number of the 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 shifting block 43 is mounted below the final driven gear 42 and comprises an upper end abutting part 431, a lower end abutting part 432 and a rotating shaft part 433, the shifting block 43 is rotatably mounted on the gear box 41 through the rotating shaft part 433 and is lifted along the rotating shaft part 433, the upper end abutting part 431 is arranged in the guide groove 421 of the driven gear 42, and the lower end abutting part 432 is always positioned above the microswitch 8; when the upper end abutting part 431 abuts against the inner wall of the guide groove 421, the lower end abutting part 432 of the shifting block 43 abuts against the button 81 of the microswitch 8, so that the microswitch 8 is in a closed state; when the driving action of the driving gear 3 of final driven gear 42 at rotates down and makes the upper end support portion 431 be located the notch 422 position, because there is not the limiting displacement of inner wall, this micro-gap switch 8's button 81 can push away the shifting block 43 and rotate, thereby micro-gap switch 8 disconnection, so through the invariable output rotational speed of control motor 2, and the drive gear 3 and the drive ratio between at least one driven gear 42, thereby the upper end support portion 431 of control shifting block 43 that can move to the time of notch 422 position by initial position, thereby the time of control micro-gap switch 8 open circuit, thereby play the effect of timing insurance.

In the above solution, preferably, the upper housing 11 has a through hole 111 corresponding to the shift block 43, so that when the upper abutting portion 431 of the shift block 43 moves to the notch 422 of the guide slot 421 and the shift block 43 is tilted upward to turn off the micro switch 8, a foreign object penetrates through the through hole 111 to press the lower abutting portion of the shift block 43, the driven gear 42 can rotate and reset under the action of the torsion spring 7, and the timing mechanism 4 resumes operation.

In the above-described configuration, it is preferable that a jack spring 51 is provided between the jack 5 and the timing mechanism 4, and the jack 5 is effectively returned by the jack spring 51 when no external force is applied.

The invention also provides a toaster with the timing safety device 1, as shown in fig. 5 and fig. 6, comprising a lifting control block 200, a guide shaft 300, a second return spring 500, a control circuit board 400 and the timing safety device 1; the lifting control block 200 comprises an elastic sheet acting part 201 and a mandril 5 acting part, and the lifting control block 200 is sleeved on the guide shaft 300 and can move upwards and downwards along the guide shaft 300; the control circuit board 400 is provided with a switch elastic sheet 401, an electromagnet 402 and a timing module 403, and the timing safety device 1 is inserted into the control circuit board 400 to realize the electrical connection between the two; by pressing the lifting control block 200 to move downwards along the guide shaft 300, the spring plate acting part 201 of the lifting control block 200 can be abutted against the switch spring plate 401 to close the switch spring plate, so that the main circuit of the toaster is in a closed state, the toaster works on a baking panel, meanwhile, the electromagnet 402 is electrified to generate magnetic force to stably attract the lifting control block 200 at the working position to ensure the stable action of the toaster, the timing module 403 is electrified to work and disconnect the main circuit after set time, and the motor 2 and the microswitch 8 of the timing safety device 1 are also in an electrified state; when the lifting control block 200 moves downwards to press the switch elastic sheet 401, the mandril action part 202 of the lifting control block 200 acts on the mandril 5 to enable the mandril 5 to push or lift the driven gear 42 of the timing mechanism 4 to be meshed with the driving gear 3 for transmission, the timing safety device 1 works, generally, the timing time of the timing safety device 1 is slightly longer than the set time of the timing module 403, namely, the time that the shifting block 43 moves along the guide groove 421 and moves to the notch 422 is longer than the set time of the timing module 403; thus, when the timing module 403 of the control circuit board normally works, 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 upwards along the guide shaft 300 under the action of the second reset spring 500, the switch elastic sheet 401 is disconnected again, the motor 2 stops working after power failure, the timing mechanism 4 is far away from the motor 2 under the action of the first reset spring 6 so that the driving gear 3 is separated from the driven gear 42, meanwhile, the driven gear 42 rotates reversely to reset under the action of the torsion spring 7, and the ejector rod 5 resets under the action of the ejector rod spring 51 so as to work next time; when the timing module 403 of the control circuit board 400 fails, after a set time, the timing module 403 fails to disconnect the main circuit, 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 43, the dial 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, the lifting control block 200 moves upwards, and the switch elastic piece 401 is disconnected again, but at this time, the timing mechanism 4 cannot reset automatically, the timing mechanism 4 of the timing safety device 1 needs to be reset manually, for example, the dial 43 is pressed through the through hole 111 of the foreign object extending into the shell 1, and the timing safety device rotates and resets under the action of the torsion spring 7 to resume working.

In the above scheme, the toaster generally has a plurality of different working gears to correspond to different baking times, and thus a timing safety device 1 can be correspondingly arranged corresponding to each working gear, so that timing safety effects on different gears can be realized, and accidents are avoided; meanwhile, the gears of the toaster are mostly knob or key structures, so that the corresponding timing safety device 1 is electrically connected with the control circuit board 400 in a rotating or pressing mode.

As shown in fig. 6, in this embodiment, the motor 2, the micro switch 8, the switch elastic sheet 401, the timing module 403, and the electromagnet 402 are connected in series, or partially connected in parallel according to specific needs, the switch elastic sheet 401 controls on/off of the main circuit, that is, the switch elastic sheet 401 controls on/off of the motor 2, the micro switch 8, the timing module 403, and the electromagnet 402, the micro switch 8 at least controls on/off of the electromagnet 402, and the timing module 403 at least controls on/off of the electromagnet 402.

The above disclosure is only an example of the present invention, but the present invention is not limited thereto, and any variations that can be made by those skilled in the art should fall within the scope of the present invention.

Claims

1. A timing safety device is characterized by comprising a shell, a motor, a driving gear, a microswitch, a timing mechanism and a mandril, wherein the motor, the driving gear, the microswitch, the timing mechanism and the mandril are arranged in the shell;

2. A timing safety device according to claim 1, wherein a through hole for a foreign object to enter the top pressing shifting block is provided at a position of the housing corresponding to the shifting block.

3. A timing safety according to claim 1, further comprising a first return spring disposed in abutting relation between the motor and the gearbox for urging the timing mechanism away from the motor.

4. A timing safety according to claim 1, further comprising a torsion spring for providing rotational force to the driven gear.

5. A toaster, comprising a control circuit board, a lifting control block and a timing safety device as claimed in any one of claims 1 to 4, wherein the control circuit board comprises a timing module, a switch elastic sheet and an electromagnet, and the timing safety device is mounted on the control circuit board;

6. The toaster as claimed in claim 5, further comprising a guide shaft, wherein said lifting control block is sleeved on said guide shaft and can slide along said guide shaft in a directional manner, and said guide shaft is further sleeved with a second return spring.