CN112908776A

CN112908776A - Improved timer

Info

Publication number: CN112908776A
Application number: CN202110379074.0A
Authority: CN
Inventors: 邱意想; 郑仲荣
Original assignee: Guangdong Minzhuo Mechanical And Electrical Co ltd
Current assignee: Guangdong Minzhuo Mechanical And Electrical Co ltd
Priority date: 2021-04-08
Filing date: 2021-04-08
Publication date: 2021-06-04
Anticipated expiration: 2041-04-08
Also published as: CN112908776B

Abstract

The present invention relates to an improved timer. The timing mechanism comprises a shell, wherein a timing adjusting gear and a time mutation mechanism are arranged on the shell. The time mutation mechanism comprises a speed change pressure rod, a fourth gear, a fifth gear and a speed change gear switching assembly, wherein the speed change gear switching assembly comprises a sixth gear, a seventh gear, a ratchet wheel, a second return spring and a snap spring. When the fifth gear presses the ratchet wheel, the ratchet wheel can be separated from the sixth gear, the ratchet wheel drives the seventh gear to rotate automatically under the drive of the incomplete gear, the rotating speed is reduced and is not influenced by the sixth gear, so that the rotating speed of the timing adjusting gear is reduced, the maximum timing time of the timer is finally improved, and the diversified requirements of users on the timing time of the timer are met.

Description

Improved timer

Technical Field

The invention relates to the technical field of timers, in particular to an improved timer.

Background

The rotational speed of the present timer on the market is more single, and after the user was regularly good, the gear rotated according to the rotational speed that designs and is not changed always, leads to the time scale scope that can set for on the timer too little, can't satisfy user's variety demand, and the user has different demands to the operating time with electrical apparatus, and along with the consumer pursues product function diversification, current technique can't satisfy this requirement.

Disclosure of Invention

The invention aims to provide an improved timer which has a large set time range and meets the time diversity requirements of users.

The purpose of the invention is realized as follows:

an improved timer comprises a bottom plate, a shell and a power setting rotating shaft, wherein the shell is arranged on the bottom plate;

the shell is provided with a timing adjusting rotating shaft, a driving motor, a timing adjusting gear, a timing cam, a timing deflector rod, a timing fixed contact piece, a timing movable contact piece, an output gear, a first gear, a second gear, a third gear, a time mutation mechanism, an eighth gear, a ninth gear, a tenth gear, a power time control cam, a power setting gear, a time control movable contact piece and a power time control deflector rod.

The timing adjusting gear and the timing cam are arranged on the power setting rotating shaft, one end of the timing shifting lever is rotatably connected to the shell, a first pawl is arranged at the other end of the timing shifting lever, the first pawl is abutted against the peripheries of the timing movable contact piece and the timing cam respectively, the first pawl is located between the timing movable contact piece and the timing cam, a first clamping groove is formed in the periphery of the timing cam, the first pawl is hooked with the first clamping groove, and the timing static contact piece is located on the outer side of the timing movable contact piece.

The middle part of the power time control shifting rod is rotatably connected to the shell, one end of the power time control shifting rod is provided with a second pawl, the periphery of the power time control cam is provided with a transition groove, the second pawl is hooked with the transition groove, and a first slope is arranged in the transition groove. The other end of the power time control deflector rod is connected with a time control movable contact piece, and one end of the time control movable contact piece is close to one end of the timing movable contact piece.

The top surface of the power time control cam is provided with a first helical gear, the bottom of the power time control cam is provided with a No. eleven gear, the bottom of the power setting gear is provided with a second helical gear, the second helical gear is matched with the first helical gear in an inclined plane, and a first return spring is arranged between the shell and the power time control cam.

The first gear, the second gear, the third gear, the fourth gear, the eighth gear and the ninth gear are duplicate gears.

An output gear is arranged on an output shaft of the driving motor and is meshed with a primary gear of the first gear, a secondary gear of the first gear is meshed with a primary gear of the second gear, and a secondary gear of the second gear is meshed with a primary gear of the third gear.

Time sudden change mechanism includes speed change depression bar, No. four gears, No. five gears and change gear switching subassembly, the middle part of speed change depression bar is rotated and is connected on the shell, the first end of speed change depression bar is equipped with the second slope, the second end of speed change depression bar is equipped with and pulls the structure, change gear switching subassembly includes No. six gears, No. seven gears, ratchet, second reset spring and jump ring and constitutes, No. five gears, No. six gears and No. seven gears set gradually and coaxial setting from top to bottom, No. five gears slide from top to bottom and set up in the shell, be equipped with incomplete gear on No. four gears, incomplete gear and No. five gear engagement, No. three gear's second grade gear and No. four gear engagement, No. four gear and No. six gear engagement.

The second reset spring is arranged between the fifth gear and the ratchet wheel, a plurality of first ratchets are arranged on the lower end face of the fifth gear at annular intervals, a plurality of second ratchets are arranged on the upper end face of the ratchet wheel corresponding to the first ratchets at annular intervals, the seventh gear is connected with the ratchet wheel, the ratchet wheel is arranged on the sixth gear, the clamp spring is arranged between the sixth gear and the ratchet wheel and is connected with the sixth gear and the ratchet wheel, a driven lug is arranged at the top of the fifth gear and is close to or abutted against a second slope, the first central shaft penetrates through the arc-shaped guide groove 512, the seventh gear is meshed with the first-stage gear of the eighth gear, the second-stage gear of the eighth gear is meshed with the first-stage gear of the ninth gear, and the first-stage gear of the ninth gear is meshed with the timing adjustment.

The secondary gear of the ten-gear is meshed with the eleventh gear, and the power setting gear is meshed with the twelfth gear.

The power setting rotating shaft is rotatably arranged on the bottom plate, an eleventh gear and a twelfth gear are rotatably arranged on the bottom plate, a thirteenth gear is arranged on the power setting rotating shaft, and the thirteenth gear is meshed with the twelfth gear.

The present invention can be further improved as follows.

The timing adjusting gear is characterized in that a pressure lever toggle groove surrounding the center of the timing adjusting gear is arranged on the surface of the timing adjusting gear, a pulling structure is located in the pressure lever toggle groove, the pressure lever toggle groove pulls a variable speed pressure lever to rotate, the pressure lever toggle groove comprises a small-diameter arc section, a sudden change section and a large-diameter arc section which are sequentially communicated, the length and the diameter of the large-diameter arc section are larger than those of the small-diameter arc section, the inner end of the sudden change section is communicated with one end of the small-diameter arc section, and the large-diameter arc section is communicated with the outer.

The tension pulling structure is a convex column, and the convex column extends into the pressure lever pulling groove.

The first end of variable speed depression bar is equipped with the arc guide way, the arc guide way is located by the second slope. The second slope is located at one end of the arc-shaped guide groove.

The arc-shaped guide groove is arc-shaped, and the rotation center of the variable speed pressure lever and the circle center of the arc-shaped guide groove are concentrically arranged.

The shell is provided with a second central shaft, the middle part of the variable speed pressure lever is provided with a sleeve, and the sleeve is sleeved on the second central shaft of the shell.

Be equipped with first center pin on the shell, No. five gears, No. six gears and No. seven gears from top to bottom set gradually on first center pin, arc guide way is passed to first center pin, No. five gears slide the setting from top to bottom on first center pin.

The driving motor comprises a first stator core, a second stator core, a rotor and a coil framework structure, wherein the inner end of the first stator core and the inner end of the second stator core are respectively arranged at two ends of the coil framework, the rotor is positioned between the outer end of the first stator core and the outer end of the second stator core, the coil framework structure comprises a coil framework and a coil, the coil is wound on the coil framework, a first fixing pin hole and a second fixing pin hole are respectively arranged at two ends of the coil framework, a first conductive pin and a second conductive pin are respectively inserted in the first fixing pin hole and the second fixing pin hole in an interference manner, the first conductive contact pin downwards passes through the first fixing pin hole, the lower end of the second conductive contact pin downwards passes through the second fixing pin hole, the upper ends of the first conductive contact pin and the second conductive contact pin are formed in a bending mode, and two ends of the coil are wound on the lower ends of the first conductive contact pin and the second conductive contact pin respectively. The coil framework adopts the conductive contact pin to be in interference insertion with the fixing pin hole, and the upper end of the conductive contact pin is bent, so that the conductive contact pin is fixed, the subsequent process of welding a lead by the contact pin and a lead structure are omitted, the production efficiency is improved, the scrappage is reduced, the wire breakage probability is reduced, the reliability of the motor is improved, and the applicability is strong.

The utility model discloses a coil, including coil skeleton, first wiring baffle, second wiring baffle, first wiring mouth, second wiring mouth, first wiring mouth and second wiring groove are crossed to the first end of coil skeleton, the both ends of coil skeleton are equipped with first wiring baffle and second wiring baffle respectively, the coil winding is between first wiring baffle and second wiring baffle, the outside of first wiring baffle is equipped with first trough, the outside of second wiring baffle is equipped with the second wiring groove, be equipped with first line mouth of crossing on the first wiring baffle, it crosses line mouth and first wiring groove to be equipped with the second on the second wiring baffle, the other end of coil crosses line mouth and second wiring groove through the second in proper order. The two wiring grooves and the two wire passing ports can hide the coils, so that the coils are prevented from being scraped and broken, the probability of wire breakage is reduced, and the reliability of the motor is improved.

The coil framework is provided with a stator core installation channel, two ends of the stator core installation channel are provided with limiting blocks, and the two stator cores can be accurately positioned when being inserted into the stator core installation channel.

The first wire passing port is close to one end of the first wire distributing groove, and the second wire passing port is close to one end of the second wire distributing groove, so that the wire head of the coil can be conveniently wired.

The upper ends of the first conductive contact pin and the second conductive contact pin are bent to be of a Gamma type, so that the first conductive contact pin and the second conductive contact pin are fixed.

The invention has the following beneficial effects:

the invention changes the rotating speed of the timing adjusting gear through the time mutation mechanism, when the fifth gear is not pressed with the ratchet wheel, the seventh gear and the sixth gear are fastened into a whole, the rotating speeds of the three are consistent, and the three are driven by the first gear. When the fifth gear presses the ratchet wheel, the ratchet wheel can be separated from the sixth gear, the ratchet wheel drives the seventh gear to rotate automatically under the drive of the incomplete gear, the rotating speed is reduced and is not influenced by the sixth gear, so that the rotating speed of the timing adjusting gear is reduced, the maximum timing time of the timer is finally improved, and the diversified requirements of users on the timing time of the timer are met.

And secondly, the coil framework adopts the conductive contact pin to be in interference insertion with the fixing pin hole, and the upper end of the conductive contact pin is bent, so that the conductive contact pin is fixed, the subsequent process of welding a lead by the contact pin and the lead structure are omitted, the production efficiency is improved, the scrappage is reduced, the wire breakage probability is reduced, the reliability of the motor is improved, and the applicability is strong.

In addition, the two wiring grooves and the two wire passing ports can hide the coil, so that the coil is prevented from being scraped and broken, the probability of wire breakage is reduced, and the reliability of the motor is further improved.

Drawings

Fig. 1 is a schematic diagram of the improved timer of the present invention.

Fig. 2 is a schematic structural diagram of the improved timer of the present invention with a bottom plate omitted.

Fig. 3 is a schematic structural view of the present invention with the base plate and the housing omitted.

Fig. 4 is a top view of the present invention with the base plate and housing omitted.

Fig. 5 is a schematic diagram of an exploded structure of the improved timer of the present invention.

Fig. 6 is a schematic connection diagram of the time-varying structure of the present invention and the timing adjusting gear, the first gear, the second gear and the third gear.

Fig. 7 is a schematic view of the connection at another angle of fig. 6.

Fig. 8 is a schematic view of the connection of the time-break structure of the present invention with the timing adjustment gear.

Fig. 9 is a schematic view of the structure of fig. 8 at another angle.

Fig. 10 is a schematic structural view of the shift lever of the present invention.

Fig. 11 is a schematic structural view of the fifth gear of the present invention.

FIG. 12 is a schematic view of another angle configuration of the fifth gear of the present invention.

Fig. 13 is a schematic structural view of the change gear switching assembly of the present invention.

Fig. 14 is an exploded schematic view of the ratio gear switching assembly of the present invention.

Fig. 15 is a cross-sectional view of the ratio gear switching assembly of the present invention.

Fig. 16 is an enlarged view at a in fig. 5.

Fig. 17 is a schematic view of the structure of the drive motor (coil omitted) of the present invention.

Fig. 18 is a schematic structural view of a bobbin structure of the present invention.

Fig. 19 is a schematic view of the construction of the bobbin of the present invention.

Detailed Description

The invention is further described with reference to the following figures and examples.

In a first embodiment, as shown in fig. 1 to 19, an improved timer includes a base plate 10, a housing 1 and a power setting spindle 8, wherein the housing 1 is disposed on the base plate 10.

The shell 1 is provided with a timing adjusting rotating shaft 6, a driving motor 7, a timing adjusting gear 58, a timing cam 65, a timing shift lever 64, a timing contact piece 61, a timing moving contact piece 62, an output gear 519, a first gear 514, a second gear 513, a third gear 613, a time mutation mechanism, an eighth gear 515, a ninth gear 516, a tenth gear 612, a power time control cam 611, a power setting gear 68, a time control moving contact piece 63 and a power time control shift lever 67.

The timing adjusting gear 58 and the timing cam 65 are arranged on the power setting rotating shaft 8, one end of the timing shift lever 64 is rotatably connected to the housing 1, the other end of the timing shift lever 64 is provided with a first pawl 641, the first pawl 641 is respectively abutted against the outer peripheries of the timing movable contact piece 62 and the timing cam 65, the first pawl 641 is positioned between the timing movable contact piece 62 and the timing cam 65, the outer periphery of the timing cam 65 is provided with a first clamping groove 66, the first pawl 641 is hooked with the first clamping groove 66, and the timing static contact piece is positioned on the outer side of the timing movable contact piece 62.

The middle part of the power control time shift lever 67 is rotatably connected to the housing 1, one end of the power control time shift lever 67 is provided with a second pawl 670, the periphery of the power control time cam 611 is provided with a transition groove 617, the second pawl 670 is hooked with the transition groove 617, and a first slope 620 is arranged in the transition groove 617. The other end of the power time control shift lever 67 is connected with the time control movable contact piece 63, and one end of the time control movable contact piece 63 is close to one end of the timing movable contact piece 62.

The top surface of the power time control cam 611 is provided with a first helical gear 619, the bottom of the power time control cam 611 is provided with an eleventh gear 610, the bottom of the power setting gear 68 is provided with a second helical gear, the second helical gear is in inclined plane fit with the first helical gear 619, and a first return spring 621 is arranged between the shell 1 and the power time control cam 611.

The first gear 514, the second gear 513, the third gear 613, the fourth gear, the eighth gear 515 and the ninth gear 516 are duplicate gears.

An output gear 519 is arranged on an output shaft of the driving motor 7, the output gear 519 is meshed with a first-stage gear of the first gear 514, a second-stage gear of the first gear 514 is meshed with a first-stage gear of the second gear 513, and a second-stage gear of the second gear 513 is meshed with a first-stage gear of the third gear 613.

The time mutation mechanism comprises a speed change pressure rod 51, a fourth gear 50, a fifth gear 52 and a speed change gear switching component 53, the middle part of the speed change pressure lever 51 is rotatably connected to the shell 1, a first end of the speed change pressure lever 51 is provided with a second slope 511, the second end of the shift lever 51 is provided with a pulling structure 513, the shift gear switching assembly 53 comprises a sixth gear 530, a seventh gear 531, a ratchet 532, a second return spring 536 and a snap spring 534, the fifth gear 52, the sixth gear 530 and the seventh gear 531 are arranged from top to bottom in sequence and coaxially, the fifth gear 52 is arranged in the shell in a vertically sliding manner, the fourth gear 50 is provided with an incomplete gear 54, the incomplete gear 54 meshes with a fifth gear 52, the secondary gear of the third gear 613 meshes with a fourth gear 50, and the fourth gear 50 meshes with a sixth gear 530.

The second return spring 535 is arranged between the fifth gear 52 and the ratchet wheel 532, a plurality of first ratchets 522 are annularly arranged on the lower end face of the fifth gear 52 at intervals, a plurality of second ratchets 533 are annularly arranged on the upper end face of the ratchet wheel 532 at intervals corresponding to the first ratchets 522, the seventh gear 531 is connected with the ratchet wheel 532, the ratchet wheel 532 is arranged on the sixth gear 530, the snap spring 534 is arranged between the sixth gear 530 and the ratchet wheel 532, the snap spring 534 is connected with the sixth gear 530 and the ratchet wheel 532, a driven lug 521 is arranged at the top of the fifth gear 52, the driven lug 521 is close to or abutted against the second slope 511, the seventh gear 531 is meshed with the first-level gear of the eighth gear 515, the second-level gear of the eighth gear 515 is meshed with the first-level gear of the ninth gear 516, and the first-level gear of the ninth gear 516 is meshed with the timing adjustment.

The secondary gear of the ten-speed gear 612 is engaged with the eleven-speed gear 610, and the power setting gear 68 is engaged with the twelve-speed gear 513.

The power setting rotating shaft 8 is rotatably arranged on the bottom plate 10, an eleventh gear 610 and a twelfth gear 69 are rotatably arranged on the bottom plate 10, a thirteenth gear 81 is arranged on the power setting rotating shaft 8, and the thirteenth gear 81 is meshed with the twelfth gear 69.

The present invention is a more specific embodiment.

The surface of the timing adjusting gear 58 is provided with a pressure lever toggle groove 580 surrounding the center of the timing adjusting gear, the pulling structure 513 is located in the pressure lever toggle groove 580, the pressure lever toggle groove 580 pulls the speed change pressure lever 51 to rotate, the pressure lever toggle groove 580 comprises a small-diameter arc section 510, a sudden change section 59 and a large-diameter arc section 57 which are sequentially communicated, the length and the diameter of the large-diameter arc section 57 are larger than those of the small-diameter arc section 510, the inner end of the sudden change section 59 is communicated with one end of the small-diameter arc section 510, and the large-diameter arc section 57 is communicated with the outer end of the sudden change section 59.

The tension structure 513 is a convex pillar, and the convex pillar extends into the pressing rod toggle groove 580.

An arc-shaped guide groove 512 is formed in the first end of the shift lever 51, and the arc-shaped guide groove 512 is located beside the second slope 511.

The arc-shaped guide groove 512 is arc-shaped, and the rotation center of the speed change pressure lever 51 is concentric with the circle center of the arc-shaped guide groove 512. The second slope 511 is located at one end of the arc-shaped guide groove 512.

The housing 1 is provided with a second central shaft 56, the middle part of the shift pressure lever 51 is provided with a sleeve 520, and the sleeve 520 is sleeved on the second central shaft 56 of the housing 1.

Be equipped with on the first center pin 55 on the shell 1, No. five gear 52, No. six gear 530 and No. seven gear 531 from top to bottom set gradually on first center pin 55, arc guide way 512 is passed to last 55 of first center pin, No. five gear 52 slides from top to bottom and sets up on first center pin 55.

The driving motor 7 includes a first stator core 72, a second stator core 73, a rotor 74 and a coil frame structure 71, the coil frame structure 71 includes a coil frame 713 and a coil 720, the coil 720 is wound on the coil frame 713, the inner end of the first stator core 72 and the inner end of the second stator core 73 are respectively disposed at two ends of the coil frame 713, and the rotor 74 is located between the outer end of the first stator core 72 and the outer end of the second stator core 73. The coil comprises a coil framework 713 and is characterized in that two ends of the coil framework 713 are respectively provided with a first fixing pinhole 714 and a second fixing pinhole 715, a first conductive pin 76 and a second conductive pin 75 are respectively inserted into the first fixing pinhole 714 and the second fixing pinhole 715 in an interference insertion mode, the first conductive pin 76 downwards penetrates through the first fixing pinhole 714, the lower end of the second conductive pin 75 downwards penetrates through the second fixing pinhole 715, the upper ends of the first conductive pin 76 and the second conductive pin 75 are formed in a bending mode, and two ends of the coil 720 are respectively wound at the lower ends of the first conductive pin 76 and the second conductive pin 75.

The present invention is a more specific embodiment.

The coil comprises a coil framework 713 and is characterized in that two ends of the coil framework 713 are respectively provided with a first wire protection baffle 79 and a second wire protection baffle 710, the coil framework 713 between the first wire protection baffle 79 and the second wire protection baffle 710 is a winding area 717, a coil 720 is wound between the first wire protection baffle and the second wire protection baffle, the outer side of the first wire protection baffle 79 is provided with a first wiring groove 77, the outer side of the second wire protection baffle 710 is provided with a second wiring groove 78, the first wire protection baffle 79 is provided with a first wire passing hole 712, the second wire protection baffle 710 is provided with a second wire passing hole 711, one end of the coil 720 sequentially passes through the first wire passing hole 712 and the first wiring groove 77, and the other end of the coil 720 sequentially passes through the second wire passing hole 711 and the second wiring groove 78. The two wiring grooves and the two wire passing ports can hide the coil 720, so that the coil 720 is prevented from being scraped and broken, the probability of wire breakage is reduced, and the reliability of the motor is improved.

The first wire passing opening 712 is close to one end of the first wire slot 77, and the second wire passing opening 711 is close to one end of the second wire slot 78, so as to facilitate the wire end routing of the coil 720.

The coil framework 713 is provided with stator core installation channels 719, two ends of each stator core installation channel are provided with limit blocks 718, and the inner ends of the two stator cores can be accurately positioned when being inserted into the stator core installation channels 719.

The upper ends of the first conductive pin 76 and the second conductive pin 75 are bent in a r-type shape, so that the first conductive pin 76 and the second conductive pin 75 are fixed.

The working principle of the invention is as follows: when the pressure applied to the ratchet 532 is smaller than the elastic force of the snap spring 534, the ratchet 532 and the sixth gear 530 rotate synchronously, and when the pressure applied to the ratchet 532 is larger than the elastic force of the snap spring 534, the ratchet 532 and the sixth gear 530 rotate separately.

When the timer of the present invention is applied to a microwave oven, after a user sets a timing time by rotating the timing adjusting rotating shaft 6 and a power setting operation power by the power setting rotating shaft 8, the timing movable contact piece 62 abuts against one end of the timing static contact piece under the extrusion of the first pawl 641 of the timing shift lever 64, and similarly, the timing movable contact piece 63 abuts against the other end of the timing static contact piece under the extrusion of the second pawl 670, and a circuit of the microwave oven is connected to start operation. Meanwhile, the driving motor 7 drives the fourth gear 50 to rotate through the driving gear, the first gear 514, the second gear 513 and the third gear 613 in sequence, the fourth gear 50 drives the sixth gear 530 to rotate, the incomplete gear 54 also drives the fifth gear 52 to intermittently rotate, but no transmission exists between the fifth gear 52 and the ratchet 532, the ratchet 532 and the sixth gear 530 are clamped together by the snap spring 534, the ratchet 532 and the seventh gear 531 rotate along with the sixth gear 530, and the seventh gear 531 drives the timing adjusting gear 58 and the timing cam 65 to rotate through the eighth gear 515 and the ninth gear 516 in sequence.

When the timing adjusting gear 58 rotates, the convex column of the shift pressure lever 51 slides in the large-diameter arc section 57 of the pressure lever toggle groove 580, when the timing adjusting gear 58 rotates to a certain moment, the convex column of the shift pressure lever 51 starts to slide into the abrupt change section 59 of the pressure lever toggle groove 580, the pressure lever toggle groove 580 pulls the second end of the shift pressure lever 51 to move towards the center of the timing adjusting gear 58 through the convex column, so that the shift pressure lever 51 rotates along the counterclockwise direction, the second slope 511 of the shift pressure lever 51 rotates around the second central rotating shaft 56 along the counterclockwise direction, the second slope 511 slides on the driven bump 521, the driven bump 521 slides from the lowest point of the second slope 511 to the highest point of the second slope 511, the second slope 511 presses down the driven bump 521 of the fifth gear 52, so that the fifth gear 52 slides downwards, the first return spring 621 is compressed, when the convex column of the shift pressure lever 51 slides from the abrupt change section 59 of the toggle pressure lever groove 580 to the arc section 510 in a small diameter, meanwhile, the driven bump 521 also reaches the highest point of the second slope 511, the first ratchet 522 on the fifth gear 52 is meshed with the second ratchet 533 of the ratchet 532, the fifth gear 52 presses the ratchet 532 downwards, and the pressure applied to the ratchet 532 is greater than the elastic force of the snap spring 534 at this time, so that the ratchet 532 is disengaged from the sixth gear 530, the fifth gear 52 drives the ratchet 532 to rotate, the ratchet 532 drives the seventh gear 531 to rotate by itself without being influenced by the sixth gear 530, as can be seen from the above, since the seventh gear 531 is driven by the fifth gear 52, the fifth gear 52 is driven by the incomplete gear 54 of the fourth gear 50, and the sixth gear 530 is driven by the fourth gear 50, the fifth gear 52 rotates by two teeth angles every time the fourth gear 50 rotates by one turn, the rotation speed of the seventh gear 531 is greatly reduced, thereby reducing the rotation speed of the timing adjusting gear 58, and finally increasing the maximum timing time of the timer, the timing time diversity requirement of the user on the timer is met.

In contrast, when the shift lever 51 slides from the highest point of the second slope 511 to the lowest point of the second slope 511, the fifth gear 52 slides upward by the elastic force of the first return spring 621, and the first ratchet teeth 522 of the fifth gear 52 are separated from the second ratchet teeth 533 of the ratchet gear 532. The ratchet 532, the seventh gear 531 and the sixth gear 530 are tightly matched into a whole again under the action of the elastic force of the snap spring 534, and rotate synchronously.

On the power setting side, the sixth gear 530 drives the first-stage gear of the tenth gear 612 to rotate, the second-stage gear of the tenth gear 612 drives the eleventh gear 610 and the power control cam 611 to rotate, after the power setting gear 68 is set by a user, the power setting gear 68 does not rotate, and the first helical gear 619 slides on the inclined surface of the second helical gear due to the inclined surface matching of the first helical gear 619 and the second helical gear, so that the cam moves up and down when the yield is controlled. The power setting of the timer of the invention is actually to set the working time of the microwave oven, and the longer the set working time is, the higher the power is, and conversely, the shorter the set working time is, the lower the power is.

When the power control cam 611 rotates and the second helical tooth slides to the lowest point at the highest point of the slope of the first helical tooth 619, the second return spring 535 recovers and jacks up, the power control cam 611 moves up, the second ratchet 533 slides between the edge of the top surface of the power control cam 611 and the power setting gear 68, the top surface of the power control cam 611 and the power setting gear 68 clamp the second ratchet 533 up and down, and the timing movable contact 63 abuts against the timing movable contact 62, so that the circuit of the microwave oven is conducted.

When the power control cam 611 continues to rotate for half a turn and the second helical tooth slides to the highest point at the lowest point of the slope of the first helical tooth 619, the power control cam 611 moves downward, the second return spring 535 is compressed, the top surface of the power control cam 611 and the power setting gear 68 no longer clamp the second ratchet 533, the second pawl 670 slides through the transition groove 617 and slides to the outer peripheral wall of the power control cam 611, the timing movable contact 63 is separated from the timing movable contact 62, and the circuit of the microwave oven is disconnected, but the time is short.

In the process of the rotation of the timing adjusting gear 58, the first pawl 641 always presses the timing moving contact piece 62, so that the timing moving contact piece 62 always abuts against one end of the timing static contact piece, and the second pawl 670 always presses the timing moving contact piece 63, so that the timing moving contact piece 63 always abuts against the other end of the timing static contact piece, the timer keeps the circuit of the microwave oven connected, and the microwave oven still works.

When the timing time is up, the first pawls 641 slide from the outer periphery of the timing cam 65 into the first catching grooves 66, and the second pawls 670 slide to the outer peripheral wall of the power control cam 611, the circuit of the microwave oven is broken, and the timing is finished, and the heating operation of the microwave oven is completed.

Claims

1. An improved timer comprises a bottom plate, a shell and a power setting rotating shaft, wherein the shell is arranged on the bottom plate,

the shell is provided with a timing adjusting rotating shaft, a driving motor, a timing adjusting gear, a timing cam, a timing deflector rod, a timing fixed contact piece, a timing movable contact piece, an output gear, a first gear, a second gear, a third gear, a time mutation mechanism, an eighth gear, a ninth gear, a tenth gear, a power time control cam, a power setting gear, a time control movable contact piece and a power time control deflector rod;

the timing adjusting gear and the timing cam are arranged on the power setting rotating shaft, one end of the timing deflector rod is rotatably connected to the shell, the other end of the timing deflector rod is provided with a first pawl, the first pawl is respectively abutted against the peripheries of the timing movable contact piece and the timing cam, the first pawl is positioned between the timing movable contact piece and the timing cam, the periphery of the timing cam is provided with a first clamping groove, the first pawl is hooked with the first clamping groove, the timing static contact piece is positioned on the outer side of the timing movable contact piece,

the middle part of the power time control shifting rod is rotatably connected to the shell, one end of the power time control shifting rod is provided with a second pawl, the periphery of the power time control cam is provided with a transition groove, the second pawl is hooked with the transition groove, and a first slope is arranged in the transition groove; the other end of the power time control deflector rod is connected with a time control movable contact piece, and one end of the time control movable contact piece is close to one end of the timing movable contact piece;

the top surface of the power time control cam is provided with a first helical tooth, the bottom of the power time control cam is provided with a No. eleven gear, the bottom of the power setting gear is provided with a second helical tooth, the second helical tooth is matched with the inclined surface of the first helical tooth, and a first return spring is arranged between the shell and the power time control cam;

the first gear, the second gear, the third gear, the fourth gear, the eighth gear and the ninth gear are duplicate gears;

an output gear is arranged on an output shaft of the driving motor, the output gear is meshed with a primary gear of the first gear, a secondary gear of the first gear is meshed with a primary gear of the second gear, and a secondary gear of the second gear is meshed with a primary gear of the third gear;

the method is characterized in that: the time mutation mechanism comprises a speed change pressure rod, a fourth gear, a fifth gear and a speed change gear switching assembly, the middle of the speed change pressure rod is rotatably connected to the shell, a second slope is arranged at the first end of the speed change pressure rod, a pulling structure is arranged at the second end of the speed change pressure rod, the speed change gear switching assembly comprises a sixth gear, a seventh gear, a ratchet wheel, a second reset spring and a snap spring, the fifth gear, the sixth gear and the seventh gear are sequentially and coaxially arranged from top to bottom, the fifth gear is vertically and slidably arranged in the shell, an incomplete gear is arranged on the fourth gear, the incomplete gear is meshed with the fifth gear, a second-level gear of the third gear is meshed with the fourth gear, and the fourth gear is meshed with the sixth gear;

the second reset spring is arranged between the fifth gear and the ratchet wheel, a plurality of first ratchets are arranged on the lower end face of the fifth gear at annular intervals, a plurality of second ratchets are arranged on the upper end face of the ratchet wheel corresponding to the first ratchets at annular intervals, the seventh gear is connected with the ratchet wheel, the ratchet wheel is arranged on the sixth gear, the clamp spring is arranged between the sixth gear and the ratchet wheel and is connected with the sixth gear and the ratchet wheel, a driven lug is arranged at the top of the fifth gear and is close to or abutted against a second slope, the first central shaft penetrates through the arc-shaped guide groove, the seventh gear is meshed with the first-stage gear of the eighth gear, the second-stage gear of the eighth gear is meshed with the first-stage gear of the ninth gear, and the first-stage gear of the ninth gear is meshed with the timing adjustment;

the secondary gear of the ten-size gear is meshed with the eleventh-size gear, the power setting gear is meshed with the twelfth-size gear,

2. The improved timer as recited in claim 1, wherein: the timing adjusting gear is characterized in that a pressure lever toggle groove surrounding the center of the timing adjusting gear is arranged on the surface of the timing adjusting gear, a pulling structure is located in the pressure lever toggle groove, the pressure lever toggle groove pulls a variable speed pressure lever to rotate, the pressure lever toggle groove comprises a small-diameter arc section, a sudden change section and a large-diameter arc section which are sequentially communicated, the length and the diameter of the large-diameter arc section are larger than those of the small-diameter arc section, the inner end of the sudden change section is communicated with one end of the small-diameter arc section, and the large-diameter arc section is communicated with the outer.

3. The improved timer as recited in claim 2, wherein: the tension pulling structure is a convex column, and the convex column extends into the pressure lever pulling groove.

4. The improved timer as recited in claim 3, wherein: the first end of variable speed depression bar is equipped with the arc guide way, the arc guide way is located by the second slope, the arc guide way is circular-arcly, the centre of rotation of variable speed depression bar sets up with the centre of a circle of arc guide way is concentric, the second slope is located the one end of arc guide way.

5. The improved timer as recited in claim 4, wherein: the shell is provided with a second central shaft, the middle part of the variable speed pressure lever is provided with a sleeve, and the sleeve is sleeved on the second central shaft of the shell.

6. The improved timer as recited in claim 5, wherein: be equipped with first center pin on the shell, No. five gears, No. six gears and No. seven gears from top to bottom set gradually on first center pin, arc guide way is passed to first center pin, No. five gears slide the setting from top to bottom on first center pin.

7. The improved timer as recited in claim 6, wherein: the driving motor comprises a first stator core, a second stator core, a rotor and a coil framework structure, wherein the inner end of the first stator core and the inner end of the second stator core are respectively arranged at two ends of the coil framework, the rotor is positioned between the outer end of the first stator core and the outer end of the second stator core, the coil framework structure comprises a coil framework and a coil, the coil is wound on the coil framework, a first fixing pin hole and a second fixing pin hole are respectively arranged at two ends of the coil framework, a first conductive pin and a second conductive pin are respectively inserted in the first fixing pin hole and the second fixing pin hole in an interference manner, the first conductive contact pin downwards passes through the first fixing pin hole, the lower end of the second conductive contact pin downwards passes through the second fixing pin hole, the upper ends of the first conductive contact pin and the second conductive contact pin are formed in a bending mode, and two ends of the coil are wound on the lower ends of the first conductive contact pin and the second conductive contact pin respectively.

8. The improved timer as recited in claim 7, wherein a first wire protecting baffle and a second wire protecting baffle are respectively disposed at two ends of the coil frame, the coil is wound between the first wire protecting baffle and the second wire protecting baffle, a first wire running groove is disposed at an outer side of the first wire protecting baffle, a second wire running groove is disposed at an outer side of the second wire protecting baffle, a first wire passing opening is disposed on the first wire protecting baffle, a second wire passing opening is disposed on the second wire protecting baffle, one end of the coil passes through the first wire passing opening and the first wire running groove in sequence, and the other end of the coil passes through the second wire passing opening and the second wire running groove in sequence.

9. The improved timer as recited in claim 8, wherein said bobbin has a stator core mounting channel, said stator core mounting channel having stops at opposite ends thereof.

10. The improved timer as recited in claim 9, wherein said first wire port is located adjacent an end of said first wire slot and said second wire port is located adjacent an end of said second wire slot.