Fig. 3181.
A planing and matching machine designed and constructed by Messrs. London, Berry and Orton is represented in [Fig. 3181]. In this machine the upper surface of the board is surfaced first, and the matching second, the under surface being operated upon the last. The method of suspending the upper feed rolls of this machine is shown in [Fig. 3182], in which a is an upper and b a lower feed roll. The upper roll a is suspended by the link c, which is supported by the link d, and also by link e, these three links forming a parallel motion which guides a in a vertical line.
Fig. 3182.
At f (which is fast to e) is a bearing for the screw g, and the pair of bevel gears g that drives it. This screw threads into the nut h on the rod i, which receives the pressure of the bar j and weight k.
The lower feed rolls being larger in diameter gives them increased grip on the work, and gives it a better base, and also makes it enter and leave the rolls easier.
Each matcher bracket is fitted with a screw by which it can be moved at will across the machine, and by turning one other screw with the same wrench that moves the others, both brackets are firmly set to the slide and all screws held firmly. There are three changes of feed. The top cutter head is provided with improved pressure bars, which are set to or from the head by means of a double eccentric, which, while they can be set at any desired distance from the knives, limits their movement when moved towards them, rendering it impossible to get them into the cutters.