JPH0710309B2 - Electric razor - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electric shaver.

[Background technology]

An electric razor cuts the beard by introducing a beard into the blade hole formed in the outer blade and cutting the beard with the edge of the blade hole and the inner blade, but since the optimum pressing force of the outer blade on the skin is not known, If the blade's pressing force against the skin is weak, it is not possible to shave the beard shortly.If the pressing force of the outer blade against the skin is strong, the skin introduced into the blade hole reaches the inner blade and the inner blade scratches. However, there is a problem in that the outer blade and the inner blade interfere with each other to damage the outer blade and the inner blade.

[Object of the Invention]

The present invention has been made in view of the above problems, and an object of the present invention is to provide an electric razor capable of shaving in a state where an outer blade is pressed against the skin with an optimum pressing force.

[Disclosure of Invention]

Embodiments of the electric shaver of the present invention will be described below with reference to FIGS. 1 and 2. The outer blade 1 is formed of a thin metal plate in a dome shape, and has a plurality of blade holes 2. The inner blade 3 is in sliding contact with the inner surface of the outer blade 1.
The inner blade 3 is supported by the inner blade base 5 via a push-up spring 4. The inner blade 3, the push-up spring 4, and the inner blade base 5 form an inner blade 6. The inner blade 6 is the rotating shaft 8 of the motor 7.
Connected to. Connected to the motor 7 are a battery 9 as a power source for the motor 7, a power switch 10 for connecting and disconnecting the motor 7 and the battery 9, and a load current detecting means 11 having a resistance as an embodiment. The detection means 11 generates a voltage according to the magnitude of the load current flowing when the motor 7 is driven. The voltage generated by the detection means 11 is amplified by the amplifier 12 to a range that can be accurately A / D converted, and then digitally converted by the A / D converter 13, and then when the outer blade 1 is not in contact with the skin during idling. A calculation means 14 for calculating the difference between the motor load current and the load current of the motor 7 when the outer blade 1 is pressed against the skin is compared with a predetermined value described later and a value output from the calculation means 14. It is taken in by the microcomputer 16 provided with the comparison means 15 for When the value output from the calculating means 14 is larger than a predetermined value described later, the display means 18 such as a buzzer is driven through the drive circuit 17 to over-press the outer blade 1 against the skin. Is displayed. Amplifier 12, A / D converter 13,
The calculation means 14, the comparison means 15, the drive circuit 17, and the display means 18 are connected to a battery 19. Here, the predetermined value compared by the comparison means 15 is, as shown in FIG. 4, a current value I ₀ obtained by experiments and a current I when the outer blade 1 is pressed too strongly against the skin. a variation [Delta] I ₂ between the current I and the current value I ₀ when the variation [Delta] I ₁ and outer cutter 1 is pressed against a slightly stronger skin and,
The comparison means 15 compares the value of ΔI output from the calculation means 14 with ΔI ₁ and ΔI ₂ as reference values.

Next, the operation of this embodiment will be described with reference to the flowchart shown in FIG. Electric shaver for calculating means 14 and comparing means
When the execution is started by incorporating 15, the power switch 10 of the electric razor is turned on, and the battery 9 detects the detection means 11
The first loop A is repeated until an electric current flows through.
When the power switch 10 is turned on and a current flows through the detection means 11, I>
It becomes 0 and advances to the next stage. The current value measured during idling is Ir
And After that, the power switch 10 is turned off and the current I is detected by the detecting means 11 until the current stops flowing through the detecting means 11.
The conversion amount between the current I detected by the detection means 11 and the current value Ir, that is, the difference ΔI between the two currents I and Ir is calculated by the calculation means 14, and the value ΔI output from the calculation means 14 and the predetermined value are calculated. Δ
The comparison means 15 compares I ₁ and ΔI ₂ with each other, and when ΔI is larger than ΔI _1, the second loop B passing through the first display means 18a having a large volume and ΔI is smaller than ΔI ₁ and smaller than ΔI ₂ . A third loop C passing through the second display means 18b having a high volume and a low volume.
Then, when ΔI is smaller than ΔI _{2, a} fourth loop D that does not pass through the first display means 18a and the second display means 18b is selected according to the output from the comparison means 15. When the power switch 10 is turned off and the current no longer flows to the detecting means 11, I ≦ 0 is returned to the first loop A, and the first loop A is repeated until the power switch 10 is turned on next.

Although the display means 18 is a buzzer in the embodiment,
It may be performed by blinking the light emitting element.

〔The invention's effect〕

As described above, the electric shaver according to the present invention detects the outer blade having the blade hole, the inner blade slidably contacting the inner surface of the outer blade, the motor driving the inner blade, and the load current of the motor. Detecting means, a calculating means for calculating a difference between a motor load current when the outer blade is not in contact with the skin when idling and a load current of the motor when the outer blade is pressed against the skin, and a predetermined means It is characterized in that it is provided with a comparing means for comparing the value with the value output from the calculating means, and a display means for displaying a signal according to the output from the comparing means, so that the idle time and the outside The difference in the motor load current from when the blade is pressed against the skin is affected by the condition of the contact surface between the outer and inner blades and the push-up spring that causes the inner blade to contact the outer blade. Without having to press the outer blade against the skin to accurately detect the load when shaving. Since this load is displayed, you can shave while the outer blade is pressed against the skin with the optimum pressing force, and you can shave the beard short without damaging the skin with the inner blade. In addition, it is possible to prevent the outer blade and the inner blade from interfering with each other and prevent the outer blade and the inner blade from being damaged.

[Brief description of drawings]

1 is a sectional view of the electric shaver of the present invention, FIG. 2 is a circuit diagram of the electric shaver of the same, FIG. 3 is a flowchart for explaining the operation of the electric shaver of the same, and FIG. 4 is an operation of the electric shaver of the same. It is a graph for explanation. 1 ... Outer blade, 2 ... Blade hole, 3 ... Inner blade, 7 ... Motor,
11 …… Detecting means, 14 …… Computing means, 15 …… Comparison means, 18
…… Display means.

Claims (1)

[Claims] 1. An outer blade having a blade hole, an inner blade slidably contacting the inner surface of the outer blade, a motor for driving the inner blade, a detection means for detecting a load current of the motor, and the outer blade. Output from the calculation means for calculating the difference between the load current of the motor when idling without touching the skin and the load current of the motor when the outer blade is pressed against the skin, and the predetermined value and the calculation means. An electric shaver characterized by comprising: a comparing means for comparing the measured value and a display means for displaying a signal according to the output from the comparing means.