CN113021423A - Rotary shaver and cutter head thereof - Google Patents

Abstract

The application belongs to the technical field of shavers, and particularly relates to a rotary shaver and a shaver head thereof, wherein the shaver head comprises at least two cutter sets and a differential transmission mechanism, and each cutter set comprises a cutter net and an inner cutter; the differential transmission mechanism comprises a driving gear set, at least two driven gear sets, a position adjusting mechanism and an auxiliary gear set, wherein the driving gear set comprises a driving rod and a driving gear; the driven gear set comprises a rotating rod and a driven gear, and each rotating rod is connected with each internal cutter; the positioning mechanism is used for driving the driving gear to move along the axial direction of the driving rod; the auxiliary gear set comprises a crankshaft and auxiliary gears, each auxiliary gear is meshed with at least one driven gear located on the same horizontal plane and is used for being meshed with the driving gear when the driving gear moves to the corresponding horizontal plane. Therefore, the rotating speed difference of the inner cutter of at least one cutter group is different from that of other cutter groups, the whole cutter group presents different rotating speeds of the inner cutter, and the efficient scraping of hairs such as beards and the like with different lengths, softness and thicknesses can be simultaneously met.

Description

Rotary shaver and cutter head thereof

Technical Field

The application belongs to the technical field of shavers, and particularly relates to a rotary shaver and a shaver head thereof.

Background

A shaver is widely used in life of people as a common household appliance, and mainly includes a reciprocating type shaver and a rotary type shaver. Among them, the rotary shaver is favored by people due to its advantages of better mute performance, less skin irritation to the face and the like, and good skin protection.

The motor rotating speed of the rotary shaver is relatively low, but the rotating speed of the cutter of the rotary shaver is high, so that the scraping effect on long, soft and thin hairs is good, but the rotary shaver cannot effectively scrape short, thick and hard hairs just because of the high rotating speed of the rotary shaver, and the rotary shaver is reflected in a use scene, so that hairs such as beards and the like can be scraped completely by repeated operation often, and the working efficiency of the rotary shaver is low.

Disclosure of Invention

An object of the embodiment of this application is to provide a rotary shaver and tool bit thereof, aims at solving the technical problem that rotary shaver among the prior art can't compromise the high-efficient scraping off of long, soft, thin hair and short, thick, hard hair.

In order to achieve the purpose, the technical scheme adopted by the application is as follows:

in a first aspect, there is provided a cutter head comprising:

the cutter set comprises a cutter net and an inner cutter capable of rotating relative to the cutter net;

a differential drive mechanism comprising:

the driving gear set comprises a driving rod and a driving gear, wherein the driving rod is in transmission connection with a driving mechanism, and the driving gear is sleeved on the driving rod;

the driven gear set comprises a rotating rod and a plurality of driven gears with different diameters, wherein the driven gears are sleeved on the rotating rod, and each rotating rod is respectively connected with each internal cutter;

the positioning mechanism is used for driving the driving gear to move along the axial direction of the driving rod, so that the height position of the driving gear can correspond to the height position of the driven gear on different horizontal planes;

and the auxiliary gear set comprises a crankshaft and a plurality of auxiliary gears with different diameters sleeved on the crankshaft, and each auxiliary gear is meshed with at least one driven gear positioned on the same horizontal plane and is used for being meshed with the driving gear when the driving gear moves to the corresponding horizontal plane.

Optionally, the positioning mechanism includes a micro-motor, a first transmission assembly and a locking assembly, the micro-motor drives the driving rod to move along the axial direction of the driving rod through the first transmission assembly, and the locking assembly is used for locking the transmission fit relation between the first transmission assembly and the driving rod when the first transmission assembly is in transmission fit with the driving rod.

Optionally, the first transmission assembly includes a bevel gear and a driving nut, the bevel gear is sleeved on the driving shaft of the micro-motor, at least part of the rod section of the driving rod is a screw rod section, the driving nut is screwed with the screw rod section, an umbrella-shaped gear ring meshed with the bevel gear is formed on the peripheral wall of the driving nut, the driving shaft of the micro-motor drives the bevel gear to rotate, and the bevel gear drives the umbrella-shaped gear ring to rotate, so that the driving nut rotates relative to the driving rod, and the driving rod moves along the axial direction of the driving nut.

Optionally, the locking assembly includes an electromagnetic push-pull device, and a driving end of the electromagnetic push-pull device is connected to the micro-motor and is configured to drive the micro-motor to move toward the driving nut when the first transmission assembly is in transmission engagement with the driving rod, so that the bevel gear sleeved on the driving shaft of the micro-motor is engaged with the bevel gear ring.

Optionally, the positioning mechanism further comprises a second transmission assembly, and the second transmission assembly is used for transmitting and connecting the driving rod and the driving mechanism when the first transmission assembly is separated from the driving nut.

Optionally, the second transmission assembly includes a driving gear sleeved on a driving shaft of the driving mechanism and a transmission gear sleeved on the driving rod, and the driving gear is engaged with the transmission gear.

Optionally, the second transmission assembly further includes a fixed disk, a through hole for the driving shaft of the driving mechanism to pass through is formed in the bottom of the fixed disk, and the driving gear is sleeved on one end, extending out of the through hole, of the driving shaft of the driving mechanism.

Optionally, the ratio of the reference circle diameter of the driving gear to the reference circle diameter of the driven gear is 0.2-6.

Optionally, the projection of each driven gear along the height direction is distributed in a divergent manner with the center of the driving gear as a circle center, and the center of the projection of each driven gear along the height direction is located on a first circle with the center of the driving gear as a circle center.

The embodiment of the application has at least the following beneficial effects: the utility model provides a tool bit, it includes two at least knife tackle and differential drive mechanism, and the knife tackle is including the sword net with can be for the rotatory interior cutter of sword net, the tool bit during operation, interior cutter can rotate and strike off hair such as beard that stretches into from the aperture of sword net. When the differential transmission mechanism works, the driving rod of the driving gear set rotates under the driving of the driving mechanism and drives the driving gear to rotate, when the driving gear rotates, the driving gear can transmit the rotating force to the driven gear through the secondary gear to drive the rotating rod to rotate, so as to drive each inner cutter to rotate relative to the cutter net, and because the positioning mechanism can drive the driving gear to move along the axial direction of the driving rod, the driving gear can be meshed with the secondary gears on different horizontal planes to drive the driven gears on corresponding horizontal planes to rotate, because the driven gears on different horizontal planes have different diameters, when the driving gear drives the driven gears on different horizontal planes to rotate, the rotating speed of each driven gear can present differentiation, so that the rotating speed of the inner cutters rotating along with the driven gears also presents differentiation, and further when the cutter head is applied to the rotary shaver, the embodiment is in shaving effect, the rotating speed difference of the inner cutter of at least one cutter group is different from that of other cutter groups, so that the whole cutter group presents different rotating speeds of the inner cutters, and the difference of the rotating speeds of the inner cutters can simultaneously meet the efficient scraping of long, soft and thin hairs such as beard and the like and short, thick and hard hairs such as beard and the like during shaving.

In a second aspect: the application provides a rotation type razor, including fuselage and foretell tool bit, the tool bit set up in on the fuselage.

The embodiment of the application provides a rotary shaver, because including foretell tool bit, and foretell tool bit is through differential drive mechanism's effect in it, can realize the differentiation performance of the interior cutter rotational speed of each knife tackle of tool bit, just so make the rotary shaver who has above-mentioned tool bit can compromise when shaving effectively scraping long, soft, thin hair such as beard and short, thick, hard hair such as beard, so just so show rotary shaver shaving efficiency that has promoted, the user product who has optimized rotary shaver experiences and feels.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic structural view of a shaver head and a shaver body according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of the engagement of a drive gear set, a driven gear set and a counter gear set of the differential drive mechanism provided by an embodiment of the present application;

FIG. 3 is a schematic partial structural view of a positioning mechanism according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of another part of the positioning mechanism according to the embodiment of the present disclosure;

fig. 5 is a schematic diagram of the engagement of the driving gear, the driven gear and the secondary gear according to the embodiment of the present application.

Wherein, in the figures, the respective reference numerals:

10-tool bit 11-tool group 12-differential transmission mechanism

13-driving gear set 14-driven gear set 15-positioning mechanism

16-pinion group 17-guide rail 18-fixed seat

20-machine body 21-driving mechanism 111-knife net

112-inner cutter 131-driving rod 132-driving gear

133-screw rod section 141-rotating rod 142-driven gear

151-micromotor 152-first transmission component 153-bevel gear

154-drive nut 155-locking assembly 156-second drive assembly

157-driving gear 158-transmission gear 159-fixed disk part

161-crankshaft 162-pinion.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to fig. 1-5 are exemplary and intended to be used to illustrate the present application and should not be construed as limiting the present application.

In the description of the present application, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is for convenience and simplicity of description, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, is not to be considered as limiting.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

As shown in fig. 1, the present embodiment provides a rotary shaver and a cutter head 10. In this embodiment, the cutter head 10 can be applied to the above-mentioned rotary shaver, and the above-mentioned rotary shaver includes a body 20, and the cutter head 10 is disposed on the body 20.

Specifically, in the present embodiment, the cutter head 10 mainly includes at least two cutter groups 11 and a differential transmission mechanism 12. Each knife group 11 comprises a knife net 111 and an inner knife 112 capable of rotating relative to the knife net 111, so that when the knife head 10 works, the knife net 111 is tightly attached to the skin, hairs such as beard and the like on the skin can extend through the gaps of the knife net 111, and the hairs such as the beard and the like extending into the knife net 111 can be scraped off in the rotating process of the inner knife 112.

More specifically, the differential transmission 12 basically includes a drive gear 132, a drive gear 132 set 13, at least two driven gears 142, a driven gear 142 set 14, a positioning mechanism 15 and a pinion gear 162, and a pinion gear 162 set 16. The driven gears 142 and the knife sets 11 are in one-to-one correspondence with the driven gear 142 and the knife sets 14. The driving gear 132 and the driving gear 132 set 13 include a driving rod 131 for driving connection with the driving mechanism 21 and a driving gear 132 fixedly secured to the driving rod 131. The driving mechanism 21 may be a driving motor in the rotary shaver body 20, or the like. The driving mechanism 21 is in transmission connection with the driving rod 131, and can drive the driving rod 131 to rotate, so that the driving rod 131 drives the driving gear 132 to rotate.

More specifically, the driven gear 142 and the driven gear 142 group 14 include a rotating rod 141 and a plurality of driven gears 142 with different diameters fixedly sleeved on the rotating rod 141, and each rotating rod 141 is connected with each internal cutter 112; the positioning mechanism 15 is used for driving the driving gear 132 to move along the axial direction of the driving rod 131, so that the height position of the driving gear 132 can correspond to the height position of the driven gear 142 on different horizontal planes; it will be appreciated that the positioning mechanism 15 is operative to drive the driving gear 132 to move to positions corresponding to the driven gears 142 located at different levels, so that the driving gear 132 and the driven gears 142 located at different levels are engaged.

The pinion 162 and pinion 162 set 16 includes a crankshaft 161 and a plurality of pinions 162 rotatably sleeved on the crankshaft 161, each pinion 162 is engaged with at least one driven gear 142 located on the same horizontal plane and is used for being engaged with the driving gear 132 when the driving gear 132 moves to the corresponding horizontal plane, so that the combination of the pinions 162 and the crankshaft 161 enables the driving gear 132 and the corresponding driven gear 142 to transmit power on one hand, and also enables the driving gear 132 and the driven gears 142 with different diameters to transmit power when a single driving gear 132 moves axially along the driving rod 131 on the other hand.

Referring to fig. 1 and 2, a cutting head 10 provided in an embodiment of the present application is further described below: the cutter head 10 provided by the embodiment of the application comprises at least two cutter sets 11 and a differential transmission mechanism 12, wherein each cutter set 11 comprises a cutter mesh 111 and an inner cutter 112 capable of rotating relative to the cutter mesh 111, and when the cutter head 10 works, the inner cutter 112 can rotate and scrape hairs such as beards and the like extending into a mesh gap of the cutter mesh 111. When the differential transmission mechanism 12 works, the driving gear 132 and the driving rod 131 of the driving gear 132 group 13 rotate under the driving of the driving mechanism 21 and drive the driving gear 132 to rotate, when the driving gear 132 rotates, the driving gear 132 can transmit the rotating force to the driven gear 142 through the secondary gear 162 to drive the rotating rod 141 to rotate, so as to drive each inner cutter 112 to rotate relative to the cutter mesh 111, and because the positioning mechanism 15 can drive the driving gear 132 to move along the axial direction of the driving rod 131, the driving gear 132 can be meshed with the secondary gears 162 on different horizontal planes to drive the driven gears 142 on corresponding horizontal planes to rotate, because the driven gears 142 on different horizontal planes have different diameters, when the driving gear 132 drives the driven gears 142 on different horizontal planes to rotate, the rotating speeds of each driven gear 142 will present a difference, so that the rotating speeds of the inner cutters 112 rotating along with the driven gears 142 also present a difference, furthermore, when the cutter head 10 is applied to a rotary shaver, in terms of shaving effect, at least one inner cutter 112 of the cutter set 11 has a different rotation speed difference from the other cutter sets 11, so that the whole cutter set 11 presents different rotation speeds of the inner cutters 112, and thus, during shaving, the difference of the rotation speeds of the inner cutters 112 can simultaneously meet the requirement of efficiently scraping hairs such as long, soft and thin beard hairs and hairs such as short, thick and hard beard hairs.

The rotary shaver provided by the embodiment of the application comprises the shaver head 10, and the shaver head 10 can realize the differentiated representation of the rotating speed of the inner cutters 112 of the cutter groups 11 of the shaver head 10 through the action of the inner differential transmission mechanism 12, so that the rotary shaver with the shaver head 10 can effectively scrape long, soft and thin hairs such as beard and the like and short, thick and hard hairs such as beard and the like during shaving, the shaving efficiency of the rotary shaver is obviously improved, and the product experience of a user of the rotary shaver is optimized.

In other embodiments of the present application, as shown in fig. 1, 3 and 4, the positioning mechanism 15 includes a micro-motor 151, a first transmission assembly 152 and a locking assembly 155, the micro-motor 151 drives the driving rod 131 to move along the axial direction thereof through the first transmission assembly 152, and the locking assembly 155 is configured to lock the transmission fit relationship between the first transmission assembly 152 and the driving rod 131 when the first transmission assembly 152 is in transmission fit with the driving rod 131.

Specifically, the positioning mechanism 15 may be mounted inside the cutter head 10, or inside the body 20 of the rotary shaver, and when the cutter head 10 is a floating cutter head 10, the positioning mechanism 15 is preferably located inside the cutter head 10, so that the complexity of the positioning mechanism 15 and other mechanical structures matched with the positioning mechanism can be reduced, and the overall design complexity of the rotary shaver can be reduced.

When the positioning mechanism 15 works, when the driving gear 132 needs to be in switching fit with the driven gears 142 located on different horizontal planes, the micro motor 151 of the positioning mechanism 15 can apply a driving force to the driving rod 131 through the first transmission assembly 152, so that the driving rod 131 can move along the axial direction thereof, and in the process that the driving rod 131 moves along the axial direction thereof, the driving gear 132 can be driven to move along the axial direction of the driving rod 131, so that the driving gear 132 can move to the corresponding positions of the driven gears 142 located on different horizontal planes. And the presence of the locking assembly 155 locks the mating relationship of the first drive assembly 152 and the drive rod 131 such that the first drive assembly 152 is able to stably transmit a rotational force to the drive rod 131.

Optionally, the existence of the locking assembly 155 also has another function, that is, when the driving gear 132 is engaged with the secondary gear 162 and the driven gear 142 on the corresponding horizontal plane, and the driving rod 131 needs to be driven by the driving mechanism 21 in the body 20 to drive the driving gear 132 to rotate, the locking assembly 155 can release the engagement relationship between the first transmission assembly 152 and the driving rod 131, so as to avoid the interference of the first transmission assembly 152 on the rotation process of the driving rod 131 driven by the driving mechanism 21.

In other embodiments of the present application, as shown in fig. 3 and 4, the first transmission assembly 152 includes a bevel gear 153 and a driving nut 154, the bevel gear 153 is sleeved on a driving shaft of the micro-motor 151, at least a portion of the shaft section of the driving shaft 131 is a lead screw section 133, the driving nut 154 is screwed with the lead screw section 133, and an outer peripheral wall surface of the driving nut 154 is formed with a bevel gear ring for meshing with the bevel gear 153, the driving shaft of the micro-motor 151 drives the bevel gear 153 to rotate, and the bevel gear 153 drives the bevel gear ring to rotate, so that the driving nut 154 rotates relative to the driving shaft 131, and the driving shaft 131 moves along an axial direction thereof.

Specifically, the first transmission assembly 152 may be specifically configured to include a bevel gear 153 and a drive nut 154, wherein axes of the bevel gear 153 and the drive nut 154 are perpendicular to each other. When the first transmission assembly 152 works, the bevel gear 153 sleeved on the driving shaft of the micro motor 151 can be engaged with the bevel gear of the driving nut 154, so that the rotating force of the micro motor 151 is changed in direction and transmitted to the driving nut 154, so that the driving nut 154 rotates relative to the driving rod 131, and the driving rod 131 is driven to move along the axial direction thereof by matching with the screw rod section 133 of the driving rod 131, thereby realizing the axial movement of the driving gear 132 along the driving rod 131.

It will be appreciated that when the driving nut 154 and the driving rod 131 are engaged, the fixing seat 18 may be provided in the body 20 of the shaver head 10 or the rotary shaver, such that the driving nut 154 is rotatably provided on the fixing seat 18 to fix the position of the driving nut 154 relative to the driving rod 131, and thus the driving rod 131 may move relative to the driving nut 154 along the axial direction thereof.

Optionally, according to the transmission design concept of the first transmission assembly 152 of the present embodiment, the first transmission assembly 152 is also extended to select a belt transmission mode, a chain transmission mode, a worm transmission mode, a screw transmission mode, or the like.

In other embodiments of the present application, the locking assembly 155 comprises an electromagnetic push-pull device, a driving end of which is connected to the micro-motor 151 and is configured to drive the micro-motor 151 towards the driving nut 154 when the first transmission assembly 152 is in driving engagement with the driving rod 131, so that the bevel gear 153 sleeved on the driving shaft of the micro-motor 151 is engaged with the bevel gear ring.

Specifically, as an implementation manner of the locking assembly 155, it may be an electromagnetic push-pull device, when the electromagnetic push-pull device is in operation, a driving end of the electromagnetic push-pull device is connected to the micro-motor 151, and can apply a pushing force close to or away from the driving rod 131 to the micro-motor 151 and the bevel gear 153 of the first transmission assembly 152 through electromagnetic driving, so that when it is required to make the driving gear 132 and the driven gear 142 located on different horizontal planes in a switching fit, the electromagnetic push-pull device can drive the micro-motor 151 and the first transmission assembly 152 to be close to the driving rod 131 until the bevel gear 153 is engaged with the bevel gear ring of the driving nut 154, and maintain the pushing force, so as to lock the transmission fit relationship between the first transmission assembly 152 and. It should be noted that the direction of the above-mentioned urging force is perpendicular to the axial direction of the driving rod 131.

When the driving gear 132 is engaged with the pinion 162 and the driven gear 142 on the corresponding horizontal plane, and the driving rod 131 needs to drive the driving gear 132 to rotate under the driving of the driving mechanism 21 in the body 20, the electromagnetic push-pull device can drive the micro-motor 151 and the bevel gear 153 of the first transmission assembly 152 to be away from the driving rod 131 until the bevel gear 153 is disengaged from the bevel gear ring of the driving nut 154, so as to ensure that the driving rod 131 can drive the driving gear 132 to rotate under the driving of the driving mechanism 21.

Alternatively, the electromagnetic push-pull device may be a circular tube type electromagnet, a push-pull type electromagnet, or the like. And as another implementation of the locking assembly 155, it may be a microcylinder or the like. And a guide rail 17 can be arranged to guide the feeding of the micro motor 151 so as to stably perform the feeding process of the micro motor 151 under the driving of an electromagnetic push-pull device.

In other embodiments of the present application, as shown in fig. 1, the positioning mechanism 15 further comprises a second transmission assembly 156, and the second transmission assembly 156 is configured to drivingly connect the driving rod 131 and the driving mechanism 21 when the first transmission assembly 152 and the driving nut 154 are out of contact.

Specifically, as a driving connection manner of the driving rod 131 and the driving mechanism 21, the second driving assembly 156 may drivingly connect the driving rod 131 and the driving mechanism 21 when the first driving assembly 152 and the driving nut 154 are out of contact. The second transmission assembly 156 may be a gear transmission assembly, a chain transmission assembly, a worm transmission assembly, a screw transmission assembly, or the like, and one end of the second transmission assembly is connected to the driving mechanism 21, and the other end of the second transmission assembly can be in transmission connection with the driving rod 131, so as to transmit the driving force of the driving mechanism 21 to the driving rod 131.

In other embodiments of the present application, as shown in fig. 1, the second transmission assembly 156 includes a driving gear 157 sleeved on the driving shaft of the driving mechanism 21 and a transmission gear 158 sleeved on the driving shaft 131, and the driving gear 157 is engaged with the transmission gear 158.

Specifically, in the present embodiment, the second transmission assembly 156 is a gear transmission assembly, which specifically includes a driving gear 157 sleeved on the driving shaft of the driving mechanism 21 and a transmission gear 158 sleeved on the driving rod 131, and the driving gear 157 is engaged with the transmission gear 158. Thus, when the driving rod 131 needs to drive the driving gear 132 to rotate under the driving of the driving mechanism 21, the driving gear 157 can transmit the driving force of the driving mechanism 21 to the driving rod 131 through the transmission gear 158, so that the driving rod 131 rotates around the axis thereof to drive the driving gear 132 to rotate, and when the driving rod 131 moves along the axial direction thereof, the transmission gear 158 also moves along the axial direction of the driving rod 131 relative to the driving gear 157, and the meshing relationship between the transmission gear 158 and the driving gear 157 is not damaged. Thus, when the driving gear 132 sleeved on the driving rod 131 is engaged with the pinion 162 and the driven gear 142 on the corresponding horizontal plane, the driving gear 157 can drive the transmission gear 158 to rotate, so that the driving rod 131 drives the driving gear 132 to rotate.

Alternatively, the height of the driving gear 157 or the transmission gear 158 in the axial direction of the driving rod 131 is greater than or equal to the maximum stroke distance of the driving rod 131 moving in the axial direction thereof, so that the driving gear 157 and the transmission gear 158 can be at least partially engaged in the axial direction of the driving rod 131 no matter where the driving rod 131 moves in the axial direction thereof, thereby improving the reliability of the transmission fit between the driving rod 131 and the driving mechanism 21.

In other embodiments of the present application, as shown in fig. 1, the second transmission assembly 156 further includes a fixed disk 159, a through hole for passing the driving shaft of the driving mechanism 21 is formed at the bottom of the fixed disk 159, and the driving gear 157 is sleeved at one end of the driving shaft of the driving mechanism 21, which extends out of the through hole. Specifically, by providing the fixing disk 159 so that the driving shaft of the driving mechanism 21 passes through the through hole and is connected to the driving gear 157, the positioning of the driving shaft is achieved, thereby improving the reliability and accuracy of the transmission fit between the driving rod 131 and the driving mechanism 21.

Alternatively, the outer peripheral edge of the fixed disk member 159 may be protruded to form an annular edge, and the driving gear 157 and the transmission gear 158 are both located in an area surrounded by the annular edge, so that the annular edge may serve to protect the driving gear 157 and the transmission gear 158, thereby further improving the reliability of the transmission fit of the driving rod 131 and the driving mechanism 21.

In other embodiments of the present application, a ratio of a pitch diameter of the driving gear 132 to a pitch diameter of the driven gear 142 is 0.2 to 6. Specifically, the ratio of the reference circle diameter of the driving gear 132 to the reference circle diameter of the driven gear 142 is 0.2-6, so that the effect of realizing obvious differentiation of the rotating speeds of the inner cutters 112 is achieved. For example, the ratio of the reference circle diameter of the driving gear 132 to the reference circle diameter of the at least one driven gear 142 on a certain horizontal plane is 1, and the ratio of the reference circle diameter of the driving gear 132 to the reference circle diameter of the at least one driven gear 142 on another horizontal plane is 6, so that the driven gears 142 on different horizontal planes can provide corresponding inner cutters 112 with obviously different rotating speeds, and the rotating speed of the inner cutters 112 can be adjusted in multiple gears, thereby further improving the compatibility of the rotary shaver to hairs such as beards with different lengths, thicknesses and diameters, and further optimizing the product experience of users of the rotary shaver.

In other embodiments of the present application, as shown in fig. 5, the projection of each driven gear 142 along the height direction is distributed in a divergent manner with the center of the driving gear 132 as the center, and the center of the projection of each driven gear 142 along the height direction is located on a circle with the center of the driving gear 132 as the center.

Specifically, the projection of each driven gear 142 along the height direction is distributed in a divergent manner with the center of the driving gear 132 as the center, which means that when the tool bit 10 is viewed from the top, the projection of each driven gear 142 is distributed in a divergent manner with the center of the driving gear 132 as the center, that is, each driven gear 142 is distributed on the periphery of the driving gear 132, and the center of the projection of each driven gear 142 along the height direction is located on a circle with the center of the driving gear 132 as the center, so that each driven gear 142 and the driving gear 132 are arranged at equal intervals, and because the inner cutter 112 and the driven gear 142 are coaxially arranged, when the tool set 11 is distributed with respect to the tool bit 10, that is, each tool set 11 is arranged at equal intervals with respect to the center of the tool bit 10. So can make each knife tackle 11 evenly arrange in tool bit 10, guarantee the rationality that knife tackle 11 arranged, can make the user get used to the rotation type razor fast, further promote the user product experience of rotation type razor.

Optionally, the cutter head 10 may also be additionally provided with a driving member, so that the cutter head 10 can rotate relative to the body 20 while the cutter set 11 works, thereby further increasing the frequency of the cutter set 11 contacting the skin at different rotating speeds, and achieving efficient hair removal of beard and other hair with different lengths, thicknesses and diameters everywhere on the skin.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.

Claims (10)

1. The utility model provides a tool bit, is applied to rotation type razor which characterized in that: the method comprises the following steps:

the cutter set comprises a cutter net and an inner cutter capable of rotating relative to the cutter net;

a differential drive mechanism comprising:

the driving gear set comprises a driving rod and a driving gear, wherein the driving rod is in transmission connection with the driving mechanism, and the driving gear is fixedly sleeved on the driving rod;

the driven gear set comprises a rotating rod and a plurality of driven gears which are fixedly sleeved on the rotating rod and have different diameters, and each rotating rod is respectively connected with each internal cutter;

the positioning mechanism is used for driving the driving gear to move along the axial direction of the driving rod, so that the height position of the driving gear can correspond to the height position of the driven gear on different horizontal planes;

and the auxiliary gear set comprises a crankshaft and a plurality of auxiliary gears which are rotatably sleeved on the crankshaft, and each auxiliary gear is meshed with at least one driven gear positioned on the same horizontal plane and is used for being meshed with the driving gear when the driving gear moves to the corresponding horizontal plane.

2. The cutter head of claim 1 wherein: the positioning mechanism comprises a micro motor, a first transmission assembly and a locking assembly, the micro motor drives the driving rod to move along the axial direction of the driving rod, and the locking assembly is used for locking the first transmission assembly and the transmission matching relation of the driving rod when the first transmission assembly and the driving rod are in transmission matching.

3. The cutter head of claim 2 wherein: first drive assembly includes bevel gear and drive nut, the bevel gear cover is located in the drive shaft of micromotor, at least part pole section of actuating lever is the lead screw section, drive nut with the spiral shell screw section closes soon, just the periphery wall face of drive nut is formed with be used for with bevel gear engaged with bevel gear's bevel gear, the drive shaft drive of micromotor bevel gear rotates, bevel gear is through driving bevel gear rotates, so that drive nut for the actuating lever rotates, and makes the actuating lever is along its axial motion.

4. The cutter head of claim 3 wherein: the locking assembly comprises an electromagnetic push-pull device, a driving end of the electromagnetic push-pull device is connected with the micro motor and used for driving the micro motor to move towards the driving nut when the first driving assembly is in transmission fit with the driving rod, so that the bevel gear sleeved on the driving shaft of the micro motor is meshed with the bevel gear ring.

5. The cutter head of claim 3 wherein: the positioning mechanism further comprises a second transmission assembly, and the second transmission assembly is used for being in transmission connection with the driving rod and the driving mechanism when the first transmission assembly is separated from the driving nut in contact.

6. The cutter head of claim 5 wherein: the second transmission assembly comprises a driving gear sleeved on a driving shaft of the driving mechanism and a transmission gear sleeved on the driving rod, and the driving gear is meshed with the transmission gear.

7. The cutter head of claim 6 wherein: the second transmission assembly further comprises a fixed disc piece, a through hole for the driving shaft of the driving mechanism to pass through is formed in the bottom of the fixed disc piece, and the driving gear is sleeved at one end, extending out of the through hole, of the driving shaft of the driving mechanism.

8. The cutter head according to any one of claims 1 to 7, wherein: the ratio of the reference circle diameter of the driving gear to the reference circle diameter of the driven gear is 0.2-6.

9. The cutter head according to any one of claims 1 to 7, wherein: the projections of the driven gears along the height direction are distributed in a divergent manner by taking the center of the driving gear as a circle center, and the centers of the projections of the driven gears along the height direction are positioned on a circle by taking the center of the driving gear as the circle center.

10. A rotary shaver, comprising a body, characterized in that: the cutter head according to any one of claims 1 to 9, which is provided on the machine body.

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