A commutating oscillating mechanism for an electric shaver

Abstract

A reversing oscillation mechanism of an electric shaver comprises a support, a middle part of which is provided with a partition, the center of the partition is provided with an output hole; a motor assembly is fixed on the bottom of the partition, and the output shaft penetrates through the output hole; characterized in that: a double-layer eccentric shaft is formed by two eccentric shafts which are connected in an up-down stacking manner, and the bottom of the double-layer eccentric shaft is fixed on the output shaft of the motor assembly; a head oscillation assembly comprises two groups of up-down stacked oscillation supports which are swingably arranged on the support through fixing shafts, the bottoms of the two groups of oscillation supports are relatively stacked, the bottom of each oscillation support is movably connected with the corresponding eccentric shaft on the double-layer eccentric shaft; two head seats are detachably installed on the top of each oscillation support in the head oscillation assembly; the double-layer eccentric shaft structure is used to enable the head to swing left and right staggeredly, the operation sound and power are more stable, the structure is simple, the operation is convenient, the stability is high, the service life is long, and the cost is low.

Description

Technical Field

[0001] This utility model relates to the field of electric shaver technology, and in particular to a reversing oscillation mechanism for an electric shaver. Background Technology

[0002] With continuous economic development and social progress, a wealth of consumer goods has been provided, creating favorable conditions for improving people's living standards and pursuing personalized lifestyles. Small household shavers generally include a motor assembly, circuit board assembly, main body, and shaving head oscillation assembly. The shaving head oscillation assembly typically includes a fixed blade holder assembly, a moving blade transmission assembly, and an oscillation frame assembly. When the main unit is turned on, the motor drives the oscillation frame assembly and the moving blade assembly mounted on it to oscillate left and right. The blade foil cuts the beard hairs inserted into the foil during the high-speed reciprocating oscillation of the moving blade assembly, achieving the purpose of shaving. In current shavers, the shaving head oscillation assembly is mostly connected to the motor on the same axis. When the motor rotation and the shaving head oscillation assembly are not on the same axis, the main solution is to use complex helical gears or bent thin-walled structures to change the angle and reverse the transmission. Although eccentric shafts are used to drive the shaving head oscillation assembly back and forth, the structure is complex, the lifespan is short, and the shaving head holder lacks the design space for the shaving head to slightly oscillate back and forth, thus preventing the blades from better conforming to the user's face and increasing the sharpness of the blades in cutting beard hairs. Therefore, the main shortcomings of the oscillating mechanism in traditional electric shavers are:

[0003] 1. When the motor assembly and the cutter head swing assembly are not on the same axis, the main solution is to change the angle and then transmit the power through a complex helical gear or swing plate structure. Currently, gear manufacturing is complex, expensive, and has poor stability.

[0004] 2. When helical gears change the transmission angle, high assembly precision is required. When the matching degree between the helical gear and the transmission in the two directions is not high, jamming is likely to occur, affecting transmission efficiency.

[0005] 3. The swing sheet structure requires a relatively high height and a very thin thickness, which makes injection molding difficult, resulting in a low pass rate and high process requirements, thus leading to higher production costs.

[0006] 4. The lifespan of the oscillating sheet is difficult to reliably guarantee during high-intensity, long-term operation. The sheet may break when oscillating left and right for a long time, which will affect the product's service life.

[0007] Further investigation reveals that patent number CN201320527496.9 discloses a reciprocating electric shaver, including a shaver holder and a swing mechanism that drives the shaver holder to reciprocate. The key technical point is that the swing mechanism includes a fixed base and a rotating rod hinged to the fixed base; two parallel and oppositely moving actuating frames that can be actuated by pins on the rotating rod; the actuating frames are connected to the shaver holder at their upper ends and drive the shaver holder to swing laterally; a swing rod hinged to the fixed base and driving the rotating rod to rotate; and an eccentric shaft that converts the motor's circular motion into lateral reciprocating motion and is connected to the swing rod. This utility model's swing mechanism has a relatively complex structure, making processing and assembly inconvenient. Furthermore, due to the numerous transmission links, it inevitably leads to energy consumption, noise, and susceptibility to damage. Utility Model Content

[0008] This utility model addresses the problems of existing technology by proposing a reversing swing mechanism for an electric shaver. It solves the transmission problem when the motor assembly and the shaver head swing assembly are not on the same axis and have different angles. It uses a double-layer offset shaft structure, which allows the shaver head to swing left and right alternately, avoiding jamming of the shaver head swing assembly. The transmission structure is simple, and the operation is more stable in terms of noise and power.

[0009] The technical solution of this utility model is: a reversing swing mechanism for an electric shaver, comprising:

[0010] A bracket with a partition in the middle and an output hole in the center of the partition;

[0011] A motor assembly is fixed to the bottom of the partition, and the output shaft passes through the output hole;

[0012] Its characteristics are:

[0013] A double-layer eccentric wheel shaft is formed by two eccentric wheel shafts stacked on top of each other and connected, with the bottom fixed to the output shaft of the motor assembly;

[0014] A single-blade swing assembly includes two sets of swing frames stacked vertically for non-linear transmission. The swing frames are oscillatingly mounted on a support via a fixed shaft. The bottoms of the two sets of swing frames are stacked relative to each other, so that the bottom of each swing frame is movably connected to the corresponding eccentric shaft on the double-layer eccentric wheel shaft, thereby swinging relative to each other.

[0015] Two sets of cutter head seats are detachably mounted on top of each swing bracket in the cutter head swing assembly.

[0016] Furthermore, the cutter head swing assembly includes a first swing frame and a second swing frame. The middle part of the first swing frame and the second swing frame is provided with a bearing for positioning the cutter head swing frame assembly. The corresponding bracket is provided with a positioning hole, and a fixed shaft passes through the bearing and is fixed to the positioning hole.

[0017] Furthermore, the fixed shaft has a separation sleeve in the middle of the two bearings to prevent the bearings of the first swing frame and the second swing frame from getting too close.

[0018] Furthermore, the movable connection is that each swing frame has a drive groove at its bottom, and the eccentric pins of the corresponding double-layer eccentric wheel shaft are slidably fixed in the drive groove at the bottom of the corresponding swing frame, so that the motor assembly drives each swing frame to swing in opposite directions, at the same speed and with the same amplitude through the double-layer eccentric wheel shaft.

[0019] Furthermore, the detachable installation is a snap-fit ​​connection, a plug-in connection, or a threaded connection; the double-layer eccentric wheel axle is a single piece.

[0020] Furthermore, the bottom of the cutter head holder is provided with a fixing slot, and the top of the corresponding swing frame is provided with an elastic locking foot to match it, so as to achieve elastic locking and fixing.

[0021] Furthermore, the cutter head holder is inserted into the cutter head frame, which has two mounting cavities in the middle. The mounting cavities have fixing grooves on both sides, and the corresponding cutter head holder has a sliding hole in the middle. The sliding shaft passes through the sliding hole and is fixed in the fixing groove.

[0022] Furthermore, the front and rear outer walls of the cutter head holder are provided with sliding strips. When the cutter head holder slides, the sliding strips abut against the inner wall of the mounting cavity, reducing friction and preventing the cutter head holder from rotating excessively.

[0023] Furthermore, the top of the cutter head holder has an insertion hole, which is used to insert two swing shafts after the connector is snapped on, thereby increasing the number of cutter holders.

[0024] Finally, the lower part of the swing frame is L-shaped, and the upper part of the swing frame bends forward to form an obtuse angle with the lower part.

[0025] Compared with the prior art, the advantages of this application are:

[0026] 1. Solve the transmission problem when the motor assembly and the cutter head swing assembly are not on the same axis and are at different angles;

[0027] 2. Avoid using complex helical gears for connection, which can cause jamming and noisy problems;

[0028] 3. Simple assembly, stable transmission, low cost, low noise, and energy saving.

[0029] 4. The double-layer offset shaft structure allows the cutter head to swing left and right alternately, resulting in smoother operation and power output.

[0030] The overall structure is simpler and more rational, easier to assemble, and the cost is reduced. Attached Figure Description

[0031] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model;

[0032] Figure 2 This is a three-dimensional structural diagram of an embodiment of the present utility model (from another angle);

[0033] Figure 3 This is an exploded structural diagram of an embodiment of the present utility model;

[0034] Figure 4 This is a schematic diagram of the exploded structure of an embodiment of the present invention (from another angle);

[0035] Figure 5 This is a cross-sectional view of the present invention;

[0036] In the diagram, 1. Bracket, 2. Partition plate, 3. Output hole, 4. Motor assembly, 5. Output shaft, 6. Double-layer eccentric wheel shaft, 7. Cutter head swing assembly, 8. Cutter head holder, 9. Cutter head seat, 10. Fixing hole, 11. Screw, 12. First swing frame, 13. Second swing frame, 14. Bearing, 15. Positioning hole, 16. Fixing shaft, 17. Separating sleeve, 18. Drive groove, 19. Mounting cavity, 20. Fixing groove, 21. Sliding hole, 22. Sliding shaft, 23. Connector, 24. Fixing slot, 25. Elastic locking foot, 26. Slide bar, 27. Eccentric shaft pin, 28. Insertion hole, 29. Swing shaft. Detailed Implementation

[0037] The embodiments of this utility model patent will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model patent, but should not be construed as limiting its scope. In the description of this utility model patent, unless otherwise stated, "multiple" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model patent. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this utility model patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model patent based on the specific circumstances.

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0040] like Figures 1 to 5 A reversing oscillation mechanism for an electric shaver includes a bracket 1, a partition 2 in the middle of the bracket 1, and an output hole 3 at the center of the partition 2; a motor assembly 4 is fixed to the bottom of the partition 2, and the output shaft 5 of the motor assembly 4 passes through the output hole 3; the partition 2 has fixing holes 10 on the left and right sides of the output hole, and the motor assembly 4 is fixed to the partition 2 of the bracket with screws 11. The key feature of this utility model is that it has a double-layer eccentric wheel shaft 6, which is formed by two eccentric wheel shafts stacked and connected vertically. In this embodiment, the double-layer... The eccentric wheel shaft 6 is a single piece, which facilitates assembly and production. The bottom of the double-layer eccentric wheel shaft 6 is riveted to the output shaft 5 of the motor assembly 4. The cutter head swing assembly 7 includes two sets of swing frames stacked vertically to achieve non-linear transmission. They are swingably mounted on the bracket 1 via a fixed shaft. The bottoms of the two sets of swing frames are stacked relative to each other, so that the bottom of each swing frame is movably connected to the corresponding eccentric shaft on the double-layer eccentric wheel shaft 6, thereby swinging relative to each other. Two cutter head seats 9 are detachably mounted on the top of each swing frame in the cutter head swing assembly 7.

[0041] The cutter head oscillation assembly 7 includes a first oscillation frame 12 and a second oscillation frame 13. The lower parts of the first oscillation frame 12 and the second oscillation frame 13 are L-shaped. The upper part of the oscillation frame is bent forward, forming an obtuse angle with the lower part. The bottoms of the two sets of oscillation frames are stacked opposite each other. A powder metallurgy bearing 14 is provided in the middle of the first oscillation frame 12 and the second oscillation frame 13 for positioning the cutter head oscillation frame assembly 7. The corresponding bracket 1 has a positioning hole 15 in the middle. A fixed shaft 16 passes through the bearing 14 and is fixed to the positioning hole 15. A separation sleeve 17 is provided in the middle of the two bearings 14 on the fixed shaft 16 to prevent the bearings 14 of the first oscillation frame 12 and the second oscillation frame 13 from being too close together, which would affect normal use. The bottom of the first swing frame 13 and the second swing frame 14 are respectively provided with elongated waist-shaped drive grooves 18. The eccentric pins 27 of the corresponding double-layer eccentric wheel shafts 6 are slidably set in the drive grooves 18 at the bottom of the corresponding swing frames. This allows the motor assembly 4 to drive the first swing frame 13 and the second swing frame 14 to swing back and forth through the double-layer eccentric wheel shafts 6, thereby realizing the function of the moving blades in a traditional shaver. Together with the outer foil, it forms a cutting system that can achieve shaving. Since the eccentric pins on the upper and lower eccentric wheels are set 180 degrees opposite to each other in the radial straight line and are kept at the same distance from the central shaft, i.e., the output shaft 5, and the bottom drive grooves 18 of the stacked swing frames are of equal width, the motor assembly can drive each swing frame to swing in opposite directions, at the same speed, and with the same amplitude through the double-layer eccentric wheel shafts, making the shaver feel more stable and comfortable when working.

[0042] Another tool holder 8 has two parallel mounting cavities 19 in the middle, which are identical in shape and size. Fixing grooves 20 are provided on both sides of the mounting cavities 19. A sliding hole 21 is provided laterally in the middle of the corresponding tool holder 9. A sliding shaft 22 passes through the sliding hole 21 and is fixed in the fixing groove 20. The tool holder 9 can slide left and right along the sliding shaft 22. Thus, the tool holder 9 has two parts, an upper tool holder and a lower tool holder. The top of the tool holder 9 may also have a socket 28. The socket 28 typically has one socket, in which a swing shaft 29 is installed to drive a tool holder. Preferably, a connector 23 is also snapped into the socket 28 of the tool holder 9. The connector 23 also has a socket, which, together with the socket 28, can be used to insert two swing shafts 29 to increase the number of tool holders. The bottom of the tool holder 9 has a fixing groove 24. The top of the corresponding first swing frame 13 and second swing frame 14 has elastic locking feet 25 to match it, achieving elastic locking and fixing. This allows the motor assembly 4 to drive the first swing frame 13 and the second swing frame 14 to swing left and right relative to each other, thereby causing the shaving head holder 9 to swing left and right relative to each other, thus realizing the shaving process. The front and rear outer walls of the shaving head holder 9 are provided with sliding strips 26. When the shaving head holder 9 swings left and right, the sliding strips 26 will abut against the inner wall of the mounting cavity 19 of the shaving head holder 8, preventing excessive swinging of the shaving head holder 9, reducing friction, improving flexibility, and thus increasing the service life of the shaving head holder 9.

[0043] Its working principle is as follows: The motor assembly 4 is fixed to the bracket 1 by screws. When the motor assembly 4 rotates, it drives the double-layer eccentric wheel shaft 6 to rotate, which in turn drives the first swing frame 12 and the second swing frame 13 to swing left and right alternately. A powder metallurgy bearing 14 is set between the first swing frame 12 and the second swing frame 13. The fixed shaft 16 is used to position the swing frame assembly. The upper part of the first swing frame 12 and the second swing frame 13 is provided with elastic locking feet 25, which are respectively connected to the upper and lower blade head seats. The upper and lower blade head seats slide left and right through the sliding shaft 22, which drives the moving blade assembly to perform rapid reciprocating motion and form a cutting system with the outer blade net. The key is to use the reversing structure of the first swing frame 12 and the second swing frame 13 to connect the two rotating components that are not on the same axis as the double-layer eccentric wheel shaft 6. When the motor assembly 4 rotates, it drives the double-layer eccentric wheel shaft 6 to connect with the blade head swing assembly 7, which in turn drives the moving blade assembly to swing left and right, thereby realizing the shaving function.

Claims

1. A reversing oscillating mechanism for an electric shaver, comprising: A bracket with a partition in the middle and an output hole in the center of the partition; A motor assembly is fixed to the bottom of the partition, and the output shaft passes through the output hole; Its features ； A double-layer eccentric wheel shaft is formed by two eccentric wheel shafts stacked on top of each other and connected, with the bottom fixed to the output shaft of the motor assembly; A single-blade swing assembly includes two sets of swing frames stacked vertically for non-linear transmission. The swing frames are oscillatingly mounted on a support via a fixed shaft. The bottoms of the two sets of swing frames are stacked relative to each other, so that the bottom of each swing frame is movably connected to the corresponding eccentric shaft on the double-layer eccentric wheel shaft, thereby swinging relative to each other. Two sets of cutter head seats are detachably mounted on top of each swing bracket in the cutter head swing assembly.

2. The reversing oscillating mechanism of the electric shaver according to claim 1, characterized in that... The aforementioned cutter head swing assembly includes a first swing frame and a second swing frame. The middle part of the first swing frame and the second swing frame is provided with a bearing for positioning the cutter head swing frame assembly. The corresponding bracket is provided with a positioning hole, and a fixed shaft passes through the bearing and is fixed to the positioning hole.

3. The reversing oscillating mechanism of the electric shaver according to claim 2, characterized in that... The fixed shaft has a separating sleeve between the two bearings to prevent the bearings of the first swing frame and the second swing frame from getting too close.

4. The reversing oscillating mechanism of the electric shaver according to claim 1, characterized in that... The movable connection is that each swing frame has a drive groove at its bottom, and the eccentric pins of the corresponding double-layer eccentric wheel shaft are slidably fixed in the drive groove at the bottom of the corresponding swing frame, so that the motor assembly drives each swing frame to swing in opposite directions, at the same speed and with the same amplitude through the double-layer eccentric wheel shaft.

5. The reversing oscillating mechanism of the electric shaver according to claim 1, characterized in that... The detachable installation is a snap-fit ​​connection, plug-in connection, or threaded connection; the double-layer eccentric wheel axle is a single piece.

6. The reversing oscillating mechanism of the electric shaver according to claim 5, characterized in that... The bottom of the cutter head holder is provided with a fixing slot, and the top of the corresponding swing frame is provided with an elastic locking foot to match it, so as to achieve elastic locking and fixing.

7. The reversing oscillating mechanism of the electric shaver according to claim 1, characterized in that... The cutter head holder is inserted into the cutter head frame. The cutter head frame has two mounting cavities in the middle. The mounting cavities have fixing grooves on both sides. The corresponding cutter head holder has a sliding hole in the middle. The sliding shaft passes through the sliding hole and is fixed in the fixing groove.

8. The reversing oscillating mechanism of the electric shaver according to claim 7, characterized in that... The front and rear outer walls of the cutter head holder are provided with slide bars. When the cutter head holder slides, the slide bars abut against the inner wall of the mounting cavity, reducing friction and preventing the cutter head holder from swinging excessively.

9. The reversing oscillating mechanism of the electric shaver according to claim 1, characterized in that... The top of the cutter head holder has a socket, and after the connector is snapped on, two swing shafts are inserted to increase the number of cutter holders.

10. The reversing oscillating mechanism of the electric shaver according to any one of claims 1 to 9, characterized in that... The lower part of the swing frame is L-shaped, and the upper part of the swing frame bends forward to form an obtuse angle with the lower part.

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