Automatic bandmill strain and saw tracking method and apparatus

Cutting – With means to monitor and control operation

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Details

83 767, 83817, 83819, B27B 1308

Patent

active

052378977

ABSTRACT:
The invention provides a bandmill having an endless loop of bandsaw blade which is automatically strained to a desired tension, and automatically driven at an accurate location or tracking position. The bandmill runs on a pair of spaced co-planar wheels, which are forced longitudinally apart to apply strain to the bandsaw. Actual saw strain is automatically detected by a force transducer within the strain mechanism, and the actual saw strain is automatically compared electronically with a desired saw strain. A servo-controller automatically adjusts distance between the wheels to vary force therebetween so that actual saw strain is varied to approach the desired saw strain. Also, actual tracking of the saw blade relative to the wheels is automatically sensed by sensors located adjacent the edge of the saw blade. The actual tracking of the saw blade is compared electronically relative to a desired tracking position, and tilt of a tiltable wheel is automatically adjusted so that actual tracking of the saw on the wheels is varied to approach the desired tracking position. Alternatively, a visual display of actual tracking accuracy can be obtained, so as to permit manual adjustment of the tiltable wheel to correct inaccurate tracking.

REFERENCES:
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Japanese Publication Mokuzai Gakkaishi, vol. 28, No. 12, pp. 783-787 (1982). Title: Feedback Control Of The Running Position Of A Band Saw With An Actuator, Nobuaki Hattori et al.

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