Radial log clamp

Details Radial log clamp Radial log clamp

1999-07-14

2001-05-08

Bray, W. Donald (Department: 1731)

Cutting

Processes

Cutting wall of hollow work

C083S056000, C083S453000, C083S458000, C083S461000, C269S288000, C082S047000, C082S053100, C082S070100

Reexamination Certificate

active

06227086

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates generally to clamping methods and apparatus. More particularly, the invention relates to clamping methods and apparatus for securing long rolls of paper (commonly referred to in the trade as “logs”) during sawing processes.
Many types of paper are produced in logs for ease of manufacture. These logs must typically be sawn into shorter rolls more readily used by consumers and the like. Automating the sawing process is necessary to achieve satisfactory production rates. Typically, automated sawing processes have utilized a reciprocating or orbital radial or band saw in combination with a stationary log clamp.
Bias cutting and inadequate clamping of the log reduce the yield of prior art sawing processes. Tremendous pressure is placed on the saw blade as it cuts into the log because the saw blade is normally toothless to avoid shredding the log. Thus, this cutting process requires greater force to shear the log than a process involving a blade with teeth, increasing bias cutting and log core crushing problems.
Prior art clamps secure a log using elastic straps or grippers during the sawing process and may adjust for varying diameters. However, these clamps may allow slight movement during the sawing process, especially for logs of large diameter and heavy density. The clamp should stably hold the log when the blade applies large forces attempting to penetrate the paper. Therefore, a need exists for a clamping device which securely holds the log, helps the blade saw the log without bias cutting and adjusts for varying log diameters.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the invention to provide a novel log saw clamp.
It is a further object of the invention to provide an improved log saw clamp that rotates while securely holding the log.
It is a still further object of the invention to provide a novel log saw clamp that automatically adjusts to varying log diameters.
It is another object of the invention to provide an improved log saw clamp that reduces bias cutting, thereby substantially improving product quality.
It is yet another object of the invention to provide a novel log saw that reduces required log saw stroke by about fifty percent
In accordance with one form of the invention, the log saw clamp includes a clamp infeed section and a clamp outfeed section rotating at the same speed adjacent a log saw. Another preferred embodiment of the invention comprises a staging section, a clamp infeed section, a log saw, a clamp outfeed section and a drive mechanism. The clamp infeed section and clamp outfeed section preferably rotate together, and securely hold the log during the sawing process.


REFERENCES:
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patent: 5509336 (1996-04-01), Biagiotti
patent: 5647259 (1997-07-01), Biagiotti
patent: 5755146 (1998-05-01), Lumberg
patent: 5941144 (1999-08-01), Lumberg

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