Cutting – With means to apply transient nonpropellant fluent material...
Reexamination Certificate
1999-08-18
2001-01-23
Rachuba, M. (Department: 3724)
Cutting
With means to apply transient nonpropellant fluent material...
C083S522110, C083S522270, C030S041700, C030S045000
Reexamination Certificate
active
06176166
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a method and apparatus for detecting an oil deficiency of oil lubricating an electrically drive cutting blade in a haircutting machine.
The cutting blade of a haircutting machine usually must be oiled. If this does not take place, first the cutting power drops and later irreparable damage occurs to the cutting blade. Currently the user (hair stylist) of the haircutting machine decides subjectively whether the cutting blade should be oiled. There is however a certain degree of convenience in postponing this oiling process to a later time. Because of that in practice often the interval between oiling events is too great, which can cause the destruction of the cutting blade. This type of haircutting machine is, for example, disclosed in German Patent Application DE 21 17 319 A.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a process and apparatus for detecting an oil deficiency of oil lubricating an electrically drive cutting blade in a haircutting machine in order to avoid the above-described disadvantage.
In a haircutting machine the motor, for example, is usually arranged in a housing behind a cutting head so that it is connected with its drive shaft with a rotating cam with an eccentric pin. This eccentric pin moves a control and/or cam slit in order to convert the rotation of the pin into an oscillating motion of successive cutting blades following each other in a direction transverse to the axis of the pin. With a greatly reduced oil film between both cutting blades they begin to rub on each other so that the required applied force, in order to maintain the oscillations of the moving blades, climbs. Because of that, the motor current increases and the rotation speed decreases. Furthermore a greater amount of the energy input into the motor is converted into heat energy by the increased friction between the blades. This causes a sharp increase in the temperature gradient at the blades in the first minutes after the turning on the haircutting machine. Because of the friction of the blades on each other the oscillatory motion of the blades is non-periodically damped whereby the housing vibrations (body noise) and the noise level from the haircutting machine increase.
The present invention is based on the above-described understanding of the principles of operation of the haircutting machine.
In the method according to the invention a measured variable is measured during operation of the haircutting machine and whether or not the oil deficiency occurs is determined from the changes in the measured variable, preferably by comparing the selected measured value with a predetermined threshold to determine if the selected measured value is above or below the threshold for a predetermined time interval. The measured variable can be the drive motor current consumption, cutting blade vibration noise, haircutting machine sound level, cutting blade, temperature, forces acting on the cutting blades or thee drive motor rotation speed.
The apparatus for determining whether or not an oil deficiency has occurred or not includes means for detecting whether there is a deficiency in the oil lubricating the cutting blades by measuring the changes in on of the above-mentioned measured variables. In a preferred embodiment the apparatus also preferably includes means for signaling the occurrence of an oil deficiency and advantageously means for oiling the cutting blades, which is automatically activated when the means for detecting the oil deficiency determines that an oil deficiency has occurred.
REFERENCES:
patent: 5111580 (1992-05-01), Bosscha et al.
patent: 5600888 (1997-02-01), Becker
patent: 21 17 319 U (1972-10-01), None
Liebeck Martin
Mattinger Detlef
Rachuba M.
Striker Michael J.
Wella Aktiengesellschaft
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