Belt-disc sander having speed adjuster

Abrading – Precision device or process - or with condition responsive... – Computer controlled

Reexamination Certificate

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Details

C451S296000, C451S008000, C451S259000, C318S268000

Reexamination Certificate

active

06949006

ABSTRACT:
A speed adjuster is provided in a belt-disc sander for controlling the rotating speed of a motor of the belt-disc sander. A speed adjust knob is disposed outside the belt-disc sander. The speed adjuster has a control circuit, a current sensor, a drive circuit, and a converter. The current sensor detects the motor current and feeds back to the control circuit, which controls the frequency variation of a SPWM signal of the drive circuit in response to the input of the speed adjust knob. The converter transforms the square wave voltage into an AC voltage for driving the motor. The desired rotating speed can be adjusted through the speed adjust knob. The control circuit will compare the present rotating speed of the motor with the set rotating speed to determine whether the present rotating speed conforms to the set one for correcting the rotating speed of the motor.

REFERENCES:
patent: 4851743 (1989-07-01), Schmerda et al.
patent: 5038084 (1991-08-01), Wing
patent: 5301471 (1994-04-01), Fisher et al.
patent: 5800249 (1998-09-01), Levy et al.
patent: 6102781 (2000-08-01), Greathouse et al.
patent: 6198240 (2001-03-01), Notohara et al.
patent: 6201929 (2001-03-01), Yu
patent: 6320286 (2001-11-01), Ramarathnam
patent: 6474913 (2002-11-01), Katoh et al.
patent: 6548983 (2003-04-01), Avella et al.

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