By means of this construction all the cutter heads act upon the timber within the short distance of 221⁄2 inches, while the side heads act within 81⁄2 inches of the under cutter. This is desirable, being conducive to the production of true work, which it is more difficult to produce in proportion as the cutter heads are wider apart. This machine will joint as narrow as 2 inches, and plane as thin as 3⁄4 inch.
The upper cylinder i′, [Fig. 3183], is adjusted for height or thickness of cut by means of the screw f, and is locked in its adjusted position on d by the nut i.
The feed is started or stopped by operating the hand wheel o′.
The upper rolls are raised or lowered simultaneously by power, by means of the shaft s, and the bevel gears r, which operate the screw a′.
The upper cylinder is driven by belt from the pulley q, the under cylinder from q′ (both these cylinders being driven from both ends). p′ is the driving pulley for the feed belt, which passes to n′, which, through k′′ and y′, drives y, which drives the feed rolls.
The machine will feed from 25 to 60 feet per minute.
PANEL PLANING AND TRYING-UP MACHINE.
This class of machine is employed for the production of true surfaces, and is now used upon much of the work that was formerly assigned to the Daniels class of planing machine. In this machine, as in the case of the Daniels planing machine, the work is secured to the table, which travels to carry the work to the feed.
[Fig. 3187] represents a machine by J. Richards, in which a cutter head with skew cutters is employed, and a pressure roll is placed in front and at the back of the cutter head, the construction being as follows:
