Apparatus and method for detecting a deficiency of oil lubricati

Details Apparatus and method for detecting a deficiency of oil lubricati Apparatus and method for detecting a deficiency of oil lubricati

1998-01-27

1999-10-26

Rachuba, M.

Cutting

Processes

8352211, 8352227, 30 417, 30 45, B26D 100

Patent

active

059708310

ABSTRACT:
The method for detecting an oil deficiency of oil lubricating a driven cutting blade of a haircutting machine includes measuring either drive motor current consumption, cutting blade vibration noise, haircutting machine sound level, cutting blade temperature, a force acting on one of the cutting blades or drive motor rotation speed and determining whether or not the oil deficiency has occurred from a change of the chosen measured variable from a standard value occurring during normal operation without the oil deficiency. The electrical haircutting machine includes an electric drive motor, cutting blades driven by the drive motor and a device (20) for detecting the oil deficiency which advantageously includes a device for measuring one of the above-mentioned measurement variables and also a comparator for comparing the measured variable with a predetermined temperature-dependent threshold value to determine whether the oil deficiency has occurred or not.

REFERENCES:
patent: 5111580 (1992-05-01), Bosscha et al.
patent: 5600888 (1997-02-01), Becker

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