Rotary razor

Abstract

A rotary shaver, comprising a cutter head holder, a stationary cutter covered on the cutter head holder and having a plurality of hair inlets, a moving cutter assembly placed in a receiving space formed by the cutter head holder and the stationary cutter and capable of rotating relative to the stationary cutter to perform hair shaving, and a transmission shaft passing through the center of the cutter head holder to drive the moving cutter assembly to rotate. A limiting hole is provided at the lower part of the moving cutter. The limiting body is elastic and includes an annular plate body adapted to the moving cutter holder disc and a plurality of leaf spring branches extending obliquely inward from the inner peripheral wall of the annular plate body towards the corresponding mounting grooves respectively. Each leaf spring branch exerts an upward pressing elastic force on the moving cutter holder disc while locking the moving cutter in its corresponding mounting groove, that is, the free end of the leaf spring branch has an elastic pressing head with both sides bent downward into an n shape and having a certain length. The top wall of the n-shaped elastic pressing head is an arc wall, so that when the elastic pressing head exerts an upward pressing elastic force on the moving cutter holder disc, the moving cutter holder disc makes a line contact for free positioning on the arc wall of the elastic pressing head.

Description

Technical Field

[0001] The present invention relates to an electric shaver, and particularly to a rotary electric shaver head. Background Art

[0002] In the prior art, a rotary shaver generally includes a stationary knife net and a multi-knife head moving knife. The moving knife and the stationary knife net move relative to each other driven by a driving member to achieve shaving. For the elastic locking of the vertical moving knives on the moving knife disc holder in the case of multiple moving knives, a three-piece type is generally adopted at present, that is, fork-shaped double elastic leaves are led out from an elastic ring and respectively inserted into two symmetrically arranged missing holes on the moving knife. The moving knife is pressed and jacked up by the leaf surfaces of the fork-shaped double elastic leaves. In some cases, a self-elastic ring or a moving knife anti-detachment buckle directly arranged on the moving knife disc holder is also provided. The anti-detachment buckle is opposite to the leading direction of the double elastic leaves. In this structure, when the fork-shaped double elastic leaves jack up the moving knife disc holder, especially during the rotation process, an unbalanced condition may occur on both sides. There is a certain torsional force difference between the double elastic leaves. At the same time, the elastic leaves have a certain width and are in surface contact with the moving knife disc holder, and they have unbalanced torsional force themselves, resulting in unbalanced jacking up of the elastic leaves, large noise, deformation and scrapping of the entire elastic body, insufficient tightness in the cooperation between the moving knife and the stationary knife, and possible consequences of beard pulling, affecting the cutting efficiency and other problems. Summary of the Invention

[0003] The purpose of the present invention is to provide a rotary shaver that can efficiently shave hair and has a floating moving knife in view of the defects existing in the prior art.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a rotary razor comprises a cutter head frame, a stationary knife with a plurality of hair inlets which is covered on the cutter head frame, a movable knife assembly which is placed in a containing space formed by the cutter head frame and the stationary knife and can rotate relative to the stationary knife to achieve shaving, and a transmission shaft which passes through the center of the cutter head frame and drives the movable knife assembly to rotate. The movable knife assembly comprises a movable knife frame disc with a plurality of radially extending mounting grooves, a limiting body fixedly installed below the movable knife frame disc, and a plurality of movable knives which are respectively inserted into the mounting grooves and have their cutting edges facing upwards. The center of the movable knife frame disc is provided with a coupling shaft connected to the transmission shaft, and a space is reserved in the mounting groove for the blade to move in the height direction. The movable knife is inserted into the mounting groove and limited by the limiting body placed below the movable knife frame disc. A limiting hole is provided at the lower part of the movable knife. The limiting body is elastic and includes an annular ring body adapted to the movable knife holder disc, and a plurality of leaf spring branches extending obliquely inward from the inner circumferential wall of the annular ring body toward the corresponding mounting groove directions. Each leaf spring branch applies an upward spring force to the movable knife holder disc while locking the movable knife in its corresponding mounting groove. That is, the free end of the leaf spring branch has a spring pressing head with two sides bent downward into an n shape and having a certain length. When the spring pressing head extends into the limiting hole and elastically locks the movable knife, the lower bottoms of the bent walls on both sides of the spring pressing head are respectively pressed against the lower edges of the limiting holes to form a balanced two-cross locking structure. The top wall of the n-shaped spring pressing head is an arc wall, and the top wall and the bent wall are connected by an arc transition, so that when the spring pressing head applies an upward spring force to the movable knife holder disc, the movable knife holder disc can freely find a linear contact on the arc wall of the spring pressing head.

[0005] As an improvement: a lifting spring body is provided under the cutter head frame to enable the cutter head to float up and down. The lifting spring body includes a circular spring ring and a plurality of spring feet extending inward and upward in the same direction. The ends of the plurality of spring feet are respectively pressed against the circumference of the lower bottom of the cutter head frame.

[0006] As an improvement: the multiple installation grooves are distributed on the movable tool holder disc in two or more coaxial rings with different diameters in an alternating manner, and the multiple installation grooves on each ring are evenly arranged along the circumference.

[0007] As an improvement: an axial center alignment structure is provided between the movable tool holder disc and the cutter head frame, and the axial center alignment structure includes a plurality of protrusions evenly distributed on the top surface of the center sleeve ring of the cutter head frame, and a downwardly opening groove guide ring is provided on the connecting shaft of the movable tool holder disc and can slide with the protrusions. The upper top surface of the protrusion and the groove guide ring are both smooth spherical arc surfaces that fit each other. When the movable tool holder disc rotates, the cutter head frame realizes axial center alignment support for the movable tool holder disc through the guiding sliding cooperation between the protrusion and the groove guide ring.

[0008] As an improvement: the limiting hole is a gate-shaped hole with an opening at the bottom, that is, the two sides of the lower bottom of the movable knife are oppositely provided with hook-shaped bottoms, and the lower edges of the two hook-shaped bottoms are on the same straight line in the hole of the gate-shaped hole.

[0009] As an improvement: the movable knife is an integral structure formed by one-time stamping, including an upper cutting edge portion and a lower shank portion, the cutting edge of the upper cutting edge portion faces upward, and the limiting hole is arranged on the lower shank portion.

[0010] The rotary razor of the present invention uses an elastic limiter to lock the movable blade and exerts an upward pressure on the movable blade disc frame, thereby indirectly moving the movable blade upward and closely fitting the lower surface of the stationary blade, so that the movable blade has a certain self-floating property relative to the stationary blade, thereby improving the cutting efficiency and shaving cleanly.

[0011] The limiter adopts a leaf spring branch corresponding to a moving knife, which effectively avoids the problem of a moving knife having a torque difference. The end of the leaf spring branch is an n-shaped spring pressure head structure, which can not only lock the moving knife to prevent the moving knife from falling out of the installation slot, but also has a line contact between its arc-shaped top wall and the moving knife holder. The moving knife holder can freely find the position and adapt to the arc-shaped top wall at the line contact position. The spring pressure head elastically supports stably, eliminating various problems caused by existing plane contact, especially noise and deformation. At the same time, the limiter is easy to process and has high structural stability.

[0012] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The figure is a schematic structural diagram of an embodiment of a rotary razor of the present invention.

[0014] Figure 2 This is an exploded view of the interior of the static knife.

[0015] Figure 3 This is the bottom structure view.

[0016] Figure 4 for Figure 3 Exploded diagram.

[0017] Figure 5 It is a structural schematic diagram of the movable knife assembly. DETAILED DESCRIPTION

[0018] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5As shown in the figure, an embodiment of the rotary razor of the present invention includes a cutter head holder 8, a stationary cutter 2 covered on the cutter head holder 8 and having a plurality of hair inlets, a moving cutter assembly placed in the accommodation space formed by the cutter head holder 8 and the stationary cutter 2 and capable of rotating relative to the stationary cutter 2 to achieve shaving, and a transmission shaft 1 passing through the center of the cutter head holder 8 to drive the moving cutter assembly to rotate. The moving cutter assembly includes a moving cutter holder disk 3 having a plurality of radially extending mounting grooves 31, a limiting body 4 fixedly installed below the moving cutter holder disk 3, and a plurality of moving cutters 5 respectively inserted into the mounting grooves 31 with their cutting edges facing upward. In this embodiment, it is a six-cutter type, and the six mounting grooves 31 are distributed in a staggered manner in the inner and outer rings with the same axis but different diameters on the moving cutter holder disk 3. The three mounting grooves on the inner and outer rings are evenly arranged along the circumference, so as to achieve a larger cutting surface. The center of the moving cutter holder disk 3 is provided with a coupling shaft 32 connected to the transmission shaft 1. A space for the blade to move in the height direction is left in the mounting groove 31. The moving cutter 5 is inserted into the mounting groove and limited by the limiting body 4 placed below the moving cutter holder disk 3. A limiting hole 7 is provided at the lower part of the moving cutter. The limiting hole 7 is a gate-shaped hole with an opening at the lower part, that is, the two sides of the lower bottom of the moving cutter 5 are hook-shaped bottoms arranged opposite to each other, and the lower edges of the two hook-shaped bottoms are on the same straight line position in the hole of the gate-shaped hole. The limiting body 4 is elastic and includes an annular ring body 41 adapted to the moving cutter holder disk and a plurality of leaf spring branches 42 extending obliquely inward from the inner peripheral wall of the ring body 41 towards the corresponding mounting grooves respectively. Each leaf spring branch 42 exerts an upward elastic pressure on the moving cutter holder disk while locking the moving cutter in its corresponding mounting groove 31. That is, the free end of the leaf spring branch 42 has a spring pressure head 43 with both sides bent downward into an n shape and having a certain length. When the spring pressure head 43 extends into the limiting hole 7 to elastically lock the moving cutter, the lower bottoms of the bent walls on both sides of the spring pressure head 43 respectively press against the lower edge in the hole of the limiting hole 7, forming two balanced cross-locking structures. The top wall of the n-shaped spring pressure head 43 is an arc-shaped wall, and there is an arc transition connection between the top wall and the bent wall, so that when the spring pressure head 43 exerts an upward elastic pressure on the moving cutter holder disk 3, the moving cutter holder disk 3 makes a line contact for free positioning on the arc-shaped wall of the spring pressure head. The prominent free positioning function of the spring pressure head enables the spring pressure head 43 to stably press against the lower bottom surface of the moving cutter holder disk 3, provide an upward force for it as needed, and realize the self-correcting cooperation with the stationary cutter 2 for it.

[0019] In this embodiment, not only does the moving cutter have local floating, but the whole cutter head also has a certain degree of floating. A lifting spring body 9 for making the cutter head float up and down is provided below the cutter head holder 8. The lifting spring body 9 includes an annular spring ring 91 and a plurality of spring feet 92 extending inward and upwardly. The ends of the plurality of spring feet 92 respectively press against the circumference of the lower bottom of the cutter head holder.

[0020] To keep the center of the entire cutter head consistent and avoid eccentricity and various problems caused by eccentricity, an axis alignment structure is provided between the moving tool rest disk 3 and the tool head rest 8. The axis alignment structure includes a number of convex heads 81 evenly distributed on the top surface of the center collar of the tool head rest 8, and a downward-opening groove guide ring 33 slidably engaged with the convex heads 81 is provided on the connecting shaft 32 of the moving tool rest disk 3. The upper top surface of the convex heads 81 and the groove guide ring 33 are both smooth and mutually adapted spherical arc surfaces. When the moving tool rest disk 3 rotates, through the guiding sliding fit between the convex heads 81 and the groove guide ring 33, the tool head rest 8 realizes the support with axis alignment for the moving tool rest disk 3.

[0021] The moving cutter 5 is an integral structure formed by one-time stamping, including an upper cutting edge part and a lower tool handle part. The cutting edge of the upper cutting edge part faces upward, and the limiting hole 7 is provided on the lower tool handle part. In the elastic limiting body and moving cutter structure of this embodiment, the connection is stable, the processing and assembly are simple, and the cost is low. Among them, the elastic limiting body enables the moving cutter to have slight up-and-down floating in the installation groove, and the elastic limiting body occupies a small space, is convenient for assembly, shaves more cleanly, and has a higher shaving efficiency.

[0022] Although the present invention has been disclosed above with specific embodiments, it is not intended to limit the present invention. Any person skilled in the art can still make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be determined by the scope defined in the appended claims.

Claims

1. A rotary razor, comprising a cutter head holder (8), a stationary cutter (2) covered on the cutter head holder (8) and having a plurality of hair inlets, a movable cutter assembly disposed in the accommodation space formed by the cutter head holder (8) and the stationary cutter (2) and capable of rotating relative to the stationary cutter (2) to effect hair shaving, and a transmission shaft (1) passing through the center of the cutter head holder (8) to drive the movable cutter assembly to rotate, characterized in that: The movable knife assembly comprises a movable knife holder disc (3) having a plurality of radially extending mounting grooves (31), a limiting body (4) fixedly mounted below the movable knife holder disc (3), and a plurality of movable knives (5) respectively inserted into the mounting grooves (31) and with their cutting edges facing upwards, wherein the center of the movable knife holder disc (3) is provided with a connecting shaft (32) connected to the transmission shaft (1), and a space for the blade to move in the height direction is reserved in the mounting groove (31), the movable knife (5) is inserted into the mounting groove and is limited by the limiting body (4) disposed below the movable knife holder disc (3), a limiting hole (7) is provided at the lower part of the movable knife, and the limiting body (4) is elastic and comprises a ring plate body (41) in a circular ring shape and adapted to the movable knife holder disc, and a plurality of movable knives (5) extending obliquely inward from the inner peripheral wall of the ring plate body (41) toward the corresponding mounting groove direction. The invention relates to a leaf spring branch (42), each leaf spring branch (42) applies an upward spring pressure to the movable knife holder disc while locking the movable knife in its corresponding installation groove (31), that is, the free end of the leaf spring branch (42) has a spring head (43) with two sides bent downward into an n-shape and having a certain length. When the spring head (43) extends into the limiting hole (7) to elastically lock the movable knife, the lower bottoms of the bent walls on both sides of the spring head (43) are respectively pressed against the lower edge of the limiting hole (7) to form a balanced two-cross locking structure. The top wall of the n-shaped spring head (43) is an arc wall, and the top wall and the bent wall are connected by an arc transition, so that when the spring head (43) applies an upward spring pressure to the movable knife holder disc (3), the movable knife holder disc (3) is in a free positioning line contact on the arc wall of the spring head.

2. The rotary razor according to claim 1, characterized in that: A lifting elastic body (9) is provided below the cutter head frame (8) to enable the cutter head to float up and down. The lifting elastic body (9) comprises a circular elastic ring (91) and a plurality of elastic feet (92) extending inwardly and upwardly in the same direction. The ends of the plurality of elastic feet (92) are respectively pressed against the circumference of the bottom of the cutter head frame.

3. The rotary razor according to claim 1 or 2, characterized in that: The multiple installation grooves (31) are distributed in a staggered manner on the movable tool holder disc (3) in the form of two or more coaxial rings with different diameters, and the multiple installation grooves on each ring are evenly arranged along the circumference.

4. The rotary razor according to claim 1 or 2, characterized in that: An axial center alignment structure is provided between the movable tool holder disc (3) and the cutter head frame (8), the axial center alignment structure comprising a plurality of protrusions (81) evenly distributed on the top surface of the center sleeve ring of the cutter head frame (8), a groove guide ring (33) with a downward opening and slidably matched with the protrusion (81) provided on the connecting shaft (32) of the movable tool holder disc (3), the upper top surface of the protrusion (81) and the groove guide ring (33) are both smooth spherical arc surfaces that fit each other, and when the movable tool holder disc (3) rotates, the cutter head frame (8) supports the movable tool holder disc (3) with axial center alignment through the guiding sliding cooperation between the protrusion (81) and the groove guide ring (33).

5. The rotary razor according to claim 3, characterized in that: An axis alignment structure is provided between the moving tool rest disc (3) and the tool head rest (8). The axis alignment structure includes a number of protruding heads (81) evenly distributed on the top surface of the central collar of the tool head rest (8), and a downward-opening groove guide ring (33) that is slidably engaged with the protruding heads (81) is provided on the connecting shaft (32) of the moving tool rest disc (3). The upper top surfaces of the protruding heads (81) and the groove guide ring (33) are both smooth and mutually adapted spherical arc surfaces. When the moving tool rest disc (3) rotates, through the guiding and sliding engagement between the protruding heads (81) and the groove guide ring (33), the tool head rest (8) supports the moving tool rest disc (3) with axis alignment achieved.

6. The rotary razor according to claim 1 or 2, characterized in that: The limiting hole (7) is a portal-shaped hole with an opening at the bottom, that is, hook-shaped bottoms are provided on both sides of the lower bottom of the moving tool (5) facing each other, and the two hook-shaped bottoms are in the same straight line position at the inner lower edge of the portal-shaped hole.

7. The rotary razor according to claim 3, characterized in that: The limiting hole (7) is a portal-shaped hole with an opening at the bottom, that is, hook-shaped bottoms are provided on both sides of the lower bottom of the moving tool (5) facing each other, and the two hook-shaped bottoms are in the same straight line position at the inner lower edge of the portal-shaped hole.

8. The rotary razor according to claim 4, characterized in that: The limiting hole (7) is a portal-shaped hole with an opening at the bottom, that is, hook-shaped bottoms are provided on both sides of the lower bottom of the moving tool (5) facing each other, and the two hook-shaped bottoms are in the same straight line position at the inner lower edge of the portal-shaped hole.

9. The rotary razor according to claim 5, characterized in that: The limiting hole (7) is a portal-shaped hole with an opening at the bottom, that is, hook-shaped bottoms are provided on both sides of the lower bottom of the moving tool (5) facing each other, and the two hook-shaped bottoms are in the same straight line position at the inner lower edge of the portal-shaped hole.

10. The rotary razor according to claim 1 or 2, characterized in that: The moving tool (5) is an integrally formed structure by one-time stamping, including an upper cutting edge portion and a lower tool handle portion. The cutting edge of the upper cutting edge portion faces upward, and the limiting hole (7) is provided on the lower tool handle portion.

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