This section is from the book "The Manufacture Of Boots And Shoes: Being A Modern Treatise Of All The Processes Of Making And Manufacturing Footgear", by F. Y. Golding. Also available from Amazon: The Manufacture Of Boots And Shoes.
The new high-speed "Amazeen" leather-skiving machine is driven from a transmitter. The balance-wheel makes from 1200 to 1400 revolutions per minute. It will be seen by Fig. 187 that the main shaft of the machine imparts motion, on the left hand, by means of worm and gear, to the feed-disc D. To the right another worm and gear gives motion to a vertical shaft, that at its lower extremity revolves the roll-feed shaft E. The knife is driven by a bevel gear that works a raw-hide bevel gear on the knife-shaft. The knife-bracket is adjustable to any desired bevel of skive by loosening the thumb-screw and central screw, and the knife-bracket-adjusting screw will enable the knife to be given the desired angle to the feed-roll. The bevel gear on the main shaft should be loosened before any adjustment is made with the knife-adjusting screw. It is well to also raise the knife by means of the knife-screw before altering the bevel of scarf. This will prevent the knife coming in contact with the feed-roll, should the knife be adjusted for a flatter skive.
To place the guide in position, the set-screw S should be released, and the screw in front of the feed-roll shaft should be turned so as to bring the shaft towards the operator. The back edge of the guide should be adjusted to come over the top or highest part of the feed-roll, so that the material may be presented directly to the edge of the knife. The shaft is returned so that the back edge of the guide is as close as possible to the knife edge without contact.
The knife must be kept keenly sharp to produce uniform skiving.
The "Amazeen " will produce excellent work, especially for turning-in, if carefully studied by the operator.
Machines are also used for reducing or skiving the toe portion of vamps. The "Gott " machine is largely used for this purpose. Another machine skives the vamp-toe, and at the same operation marks the position of the toe-cap with the figure denoting the size.
After skiving, if for turned-in work, it will be necessary to notch or nick the edges of the inside curves. This is to allow the folded portion to lay flat to the leather, and care should be taken that the nicks or serrations do not reach to the visible edge of the fold.