JPH0811145B2 - Inner blade of rotary electric razor - Google Patents

Description

Detailed Description of the Invention 【Technical field】

The present invention relates to an inner blade attached to an inner blade base of a rotary electric shaver to form an inner blade block.

[Background Art]

In the conventional inner blade, like the inner blade for outer circumference shown in FIG. 11, a plurality of cutting blade push-up springs 1 are extended from the annular portion 6 in a substantially spiral shape, and the cutting blade push-up springs are A cutting blade 2 is integrally provided at the tip of 1, and a cutting blade lifting spring 1 and a cutting blade 2 are provided.
The first folding curve 3 between and the second folding curve 5 for making the rake angle α on the cutting edge 2 are parallel to each other, and the first folding curve 3
Bend the inner blade 1 by a large amount to raise the cutting blade 2 from the blade pushing-up spring 1, and bend the cutting blade 2 in a dogleg shape at the second folding curve 5 as shown in FIGS. 12 and 13. The cutting edge 2 was provided with a rake angle α. The diameter of the circumscribing circle (a) that joins the tips of the cutting blades 2 in the expanded state and the bending position are largely dependent on providing the outer blade with a predetermined angle β.
Since the second folding curve 5 and the second folding curve 5 are parallel to each other, the degree of freedom in the method of bending the inner blade is reduced, and as a result, the circumscribed circle (a) of the inner blade is increased, and the metal plate used as the material of the inner blade A large diameter of the circumscribing circle (i) was required, and the yield when cutting the inner blade from the metal plate was poor, which was a factor of high cost.

[Object of the invention]

The present invention has been made in view of the above technical background, and its purpose is to reduce the diameter of the circumscribed circle that links the tips of the blades in the developed state of the inner blades It is to improve the yield of the metal plate used as the material.

DISCLOSURE OF THE INVENTION

The inner blade of the rotary electric shaver of the present invention is an inner blade of a rotary electric shaver in which the cutting blade pushing-up spring 1 and the cutting blade 2 are integrally formed, and the cutting blade pushing-up spring 1 bends the cutting blade 2. It is characterized in that the first folding curve 3 and the second folding curve 5 for applying the rake angle α of the cutting edge 4 to the cutting edge 2 intersect each other. Since the cutting blade pushing-up spring 1 and the cutting blade 2 are integrally formed, the number of members can be reduced to facilitate the assembly and the cost can be reduced. Also, the first folding curve 3 and the second folding curve 5
Since and are crossed, the degree of freedom of the bending method of the inner blade can be increased, and the radius of the circumscribing circle connecting the tips of the cutting blades 2 becomes small when the inner blade is in the expanded state, so that a small metal plate can be used. The inner blade can be cut out and the yield of the material metal plate is improved. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Ninth
What is shown in FIG. 10 and FIG. 10 is a rotary electric razor of the Philishave type. This has three sets of blades 9 consisting of an outer blade 7 and an inner blade block 8 provided on the upper surface, and the rotation of a motor 10 is reduced by a reduction gear through a pinion 12 fitted to its output shaft 11. The speed is reduced by 13, and the rotation is transmitted from the drive ring 14 fixed to the reduction gear 13 to the joint 15.
The joint 15 rotates together with the drive ring 14, but can slide separately in the vertical direction, and the joint 15 is elastically biased upward by a spring 17 housed inside. The outer cutter 7 has an outer cutter plate 19 fixed to an outer cutter base 18 by an insert. The outer cutter plate 19 projects from a hole 20 of a casing 21, and the edge of the outer cutter base 18 has a hole of the casing 21. The protrusion amount of the outer cutter 7 is controlled by hitting the locking edge 22 of the outer cutter 7, the outer cutter 7 is given an upward float force by the elastic arm 23, and the float force of the outer cutter 7 is caused by the elastic arm 23. It is supposed to be adjusted.
The inner blade block 8 is rotatably positioned by the pin 24 at the center of the lower surface of the outer blade 7, and the connecting portion 25 at the lower end is connected to the joint 15 to transmit the rotation of the motor 10. It is pushed up by the elastic force of the spring 17 and elastically contacted with the lower surface of the outer blade plate 19. The inner blade block 8 has two inner blades, and is an inner blade base made of synthetic resin.
The inner blade 27 for the inner circumference is attached to the upper surface of the 26 by the heat seal portion 29, and the inner blade 28 for the outer circumference is attached to the lower surface by the heat seal portion 30. A concave hole 31 for inserting the pin 24 is bored on the upper surface,
A connecting portion 25 is provided on the lower surface thereof so as to project. Inner blade 28 for outer circumference
Is cut out from a material metal plate in a shape as shown in FIG. 1. An annular portion 6 having an opening in the center has a hole 32 for heat sealing, and the outer periphery of the annular portion 6 has a substantially spiral shape. The cutting blade pushing-up spring 1 extends in a shape, and the cutting blade 2 is integrally provided at the tip of the cutting-blade pushing-up spring 1 while being slightly bent. Here, the first folding curve 3 and the cutting blade 2 for performing bending between the cutting blade pushing-up spring 1 and the cutting blade 2
Is not parallel to the second folding curve 5 that bends the blade to give the rake angle α to the blade edge 4 at the tip of the cutting blade 2 but intersects on the center side. Then, the cutting blade 2 is bent from the first folding curve 3 to a position close to vertical to stand up the cutting blade 2, and the cutting blade 2 is bent in a V shape at the second folding curve 5 to make a rake angle α to the cutting blade 2. And a sandwiching angle β is given, and the protruding side piece 33 of the tip 4 of the tip is bent from the third folding curve 34 to form the part of the cutting blade 2 as shown in FIGS. 2, 3 and 4. . In this state, the inner blade 28 for the outer circumference is attached to the lower surface of the inner blade base 26, the cutting blade 2 is arranged on the outer peripheral side of the inner blade base 26, and the upper end of the cutting blade 2 is set by the cutting blade lifting spring 1. It is elastically contacted with the outer peripheral portion of the lower surface of the outer blade 7. As shown in FIG. 5, the inner blade 27 for the inner circumference is provided with a hole 35 for heat sealing in the annular portion 6 so that the annular portion 6 has a hole 35 for heat sealing.
A cutting blade pushing-up spring 1 having a substantially circular arc shape is extended from the cutting blade pushing-up spring 1 and a cutting blade 2 is provided at the tip of the cutting-blade pushing-up spring 1 and bending between the cutting blade pushing-up spring 1 and the cutting blade 2 is performed. The first folding curve 3 to be processed and the cutting blade 2 are bent to form a blade portion 9 at the tip of the cutting blade 2.
It is not parallel to the second folding curve 5 that gives the rake angle α, and is intersected on the outer peripheral side. Then, by bending the cutting blade 2 from the first folding curve 3 to near vertical, the cutting blade 2 is set up,
The cutting edge 2 is bent along the second folding curve 5 into a dogleg shape to give the cutting edge 2 a rake angle α. In this state, the inner blade 27 for the inner circumference is attached to the lower surface of the inner blade base 26, the cutting blade 2 is arranged on the upper surface of the inner blade base 26, and the upper end of the cutting blade 2 is set by the cutting blade lifting spring 1. It is elastically contacted with the inner peripheral portion of the lower surface of the outer blade 7.

【The invention's effect】

As described above, the present invention intersects the first folding curve that bends the cutting blade from the cutting blade pushing-up spring and the second folding curve that gives the cutting edge a rake angle of the cutting blade, so that the inner blade is bent. The degree of freedom of the inner blade increases, and the radius of the circumscribing circle that links the tips of the cutting blades becomes smaller when the inner blade is in the expanded state, and the inner blade can be cut out from a small metal plate, improving the yield of the material metal plate. There is an advantage that the cost of the blade is low.
Also, the first folding curve and the second folding curve are not regulated in parallel,
Since the degree of freedom in the bending direction is increased, the rake angle and the included angle of the inner blade can be freely set, and the sharpness can be improved.

[Brief description of drawings]

FIG. 1 is a plan view of a developed state of an inner blade for the outer circumference in an embodiment of the present invention, FIG. 2 is a plan view of the same after bending, and FIG. 3 is a view taken in the direction of arrow X in FIG. FIG. 4 is a view taken in the direction of the arrow Y in FIG.
FIG. 6 is a plan view of the inner blade for inner circumference of the above embodiment in a developed state, FIG. 6 is a plan view of an inner blade block of the same, FIG. 7 is a bottom view of the same, and FIG. 8 is Z of FIG. -Z sectional view, FIG. 9 is a plan view of the rotary electric shaver of the same as above, FIG. 10 is a partially cut WW sectional view of FIG. 9, and FIG. 11 is a plan view of a conventional example in a developed state, FIG. 12 and FIG. 13 are a plan view and a side view of the same assembled state. 1 ... Cutting blade push-up spring, 2 ... Cutting blade, 3 ... First folding curve, 4 ... Blade edge, 5 ... Second folding curve.

Claims (1)

[Claims] 1. An inner blade of a rotary electric shaver in which a cutting blade pushing-up spring and a cutting blade are integrally formed, wherein a first bending curve for bending the cutting blade from the cutting blade pushing-up spring and a cutting edge of the cutting edge. Inner blade of a rotary electric razor, characterized by intersecting a second fold curve with a rake angle.