. Canadian forest industries July-December 1912. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. Showing Action of Gravity Tighteners on Slack Side of Belts Power Test on Gravity and Rigid Tighteners Save Power and Belt Bills By Avoiding Fixed Strains THE power test made on a Berlin Matcher, as illustrated above, showed that it requires 15 to 20 H. P. more to start the machine with rigid tighteners on driving belts than with Berlin gravity tighteners. The test proved beyond question that gravity tighteners save power—that they save belt bills, wear
. Canadian forest industries July-December 1912. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. Showing Action of Gravity Tighteners on Slack Side of Belts Power Test on Gravity and Rigid Tighteners Save Power and Belt Bills By Avoiding Fixed Strains THE power test made on a Berlin Matcher, as illustrated above, showed that it requires 15 to 20 H. P. more to start the machine with rigid tighteners on driving belts than with Berlin gravity tighteners. The test proved beyond question that gravity tighteners save power—that they save belt bills, wear on the matcher, and prevent hot boxes by not keeping belts under a continued abnormal strain. Yet gravity tighteners give the maximum pull for every pound of power applied. With rigid tighteners, belts must be made tight before start- ing for then the strain is greatest. They never have a chance to re- lieve heavy strain — are kept stretched even though the neces- sary strain is less after the ma- chine is running. Gravity tight- eners simply take up the slack under any pull. They allow the belt to resume its normal condi- tion immediately when the strain of starting the machine or of a heavy cut is over. The dotted lines in the left hand picture show the action of the gravity tighteners during a heavy cut. The weight of the pulleys keeps the belt just suffi- ciently tight to prevent slipping. Contrast this with the rigid tight- ener which must keep the belt tight enough all the time to make the heaviest cuts. Lightest Running Matchers Berlin High Efficiency Match- ers are the most powerful, fast- est, and lightest running ever built. They are equipped with gravity tighteners on the slack side of all belts and automatic. A 10-page circular of the several models of this machine sent upon request. takeup boxes on side and cutter head spindles. The machine is easy to operate and take care of. Working parts and adjustments are easily and quickly reached. The lack of strain from
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectforests, bookyear1912
