Cutting – Tool engages work during dwell of intermittent workfeed – Work-sensing means to control work-moving or work-stopping...
Reexamination Certificate
2000-07-14
2001-10-30
Rachuba, M. (Department: 3724)
Cutting
Tool engages work during dwell of intermittent workfeed
Work-sensing means to control work-moving or work-stopping...
C083S210000, C083S280000, C083S364000, C083S365000
Reexamination Certificate
active
06308603
ABSTRACT:
TECHNICAL FIELD
The invention relates to apparatus for cross-cutting or “bucksawing” long logs to produce logs of shorter length. More particularly the invention relates to a method and apparatus for feeding, positioning and holding a log for bucksawing to the desired length.
BACKGROUND ART
It is important in the sawing of logs into lumber that the selection of saw cuts be made to maximize the quantity and quality of lumber which is yielded by the log, depending on the length, thickness and quality of the log, such as the presence of knots, defects and the like. As the first step in this process, the tree-length log is cut into shorter lengths, or “bucked”, prior to further processing. There are two commonly used methods of carrying this out in a sawmill. A first method is a transverse system whereby the tree-length log is moved sideways through a battery of buck saws where it is segmented simultaneously into shorter logs. This method is not particularly well suited to modifying the position of the cross cut to maximize the value and recovery from the log. A second method is the lineal bucking system whereby the tree-length log is moved endwise down the conveyor to a saw which bucks the log into shorter lengths one cut at a time. This method is better at maximizing the value and recovery from the log, but in both this method and the transverse method the speed of the transport conveyor is necessarily fixed at the speed the log moves through the sawing station, resulting in low throughput. For example, since the feed conveyor in the lineal bucking system must be stopped while the log is being bucked, there is no opportunity for closing the gaps between the logs on the feed conveyor.
There is therefore a need for a log bucksawing system in which the speed of the infeed and outfeed conveyors can be operated independently of the progress of the log at the sawing station.
DISCLOSURE OF INVENTION
The present invention provides a method for bucksawing a log comprising the steps of a) advancing the log endwise along an infeed conveyor; b) raising the log above the level of said infeed conveyor while advancing the log; c) measuring the advance of the log while raised; d) stopping the log at the desired length; e) sawing the log to produce a forward log segment; and f) lowering the forward log segment onto an outfeed conveyor while advancing the remaining log segments.
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Oyen Wiggs Green & Mutalad
Rachuba M.
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