Fig. 3178.
After the lumber leaves the second pair of rolls, it runs over the bed plate w ([Fig. 3178]) and under the shoe l, the duty of which is to hold the board firmly against the bed plate, and also to break the chips on a heavy cut. After leaving the shoe it is operated on by the upper cutter head h, then it passes beneath the pressure bar g, which holds the lumber firmly while it is acted on by the matcher c.
Fig. 3179.
It then passes beneath the cleaner e′′ ([Fig. 3177]) and under the delivering roll, which is held down by the weight u in connection with the lever v and screw a′, the top which is shown at c ([Fig. 3179]). The board then passes underneath the pressure bar q ([Figs. 3177], [3180]) and over the under cutter s, from which it passes finished.
Fig. 3180.
The pressure bar q is moved up and down by turning the shaft a′′, the motion of which is given to the screw h′ by means of a pair of bevel gears. k′ is also a scraper that cleans the board before it passes under the pressure bar q. The under cutter is adjusted for depth of cut by turning hand wheel a′, which moves the screw u′. The rolls are raised and lowered by turning the shaft at p ([Fig. 3176]).