OF WOOD-WORKING MACHINERY.

39

No. 2

Extra-Heavy Large Car-Sill and Timber-Dressing Machine.

"With Solid Forged-Steel Cylinders and Feeding-Out Rolls.

To Work on all Four Sides.

This machine has been specially designed for the working of car-sills andthe heaviest bridge timbers, and is believed to be the most powerful machineever constructed for this purpose. It is made to surface and square up on foursides 20" wide by 8", 12", or 16" thick, at one operation, and has the capacity toreduce heavy timbers as much as 2" at one cut, if needed.

The cylinders are made from solid steel forgings. The journals are of largediameter and lead-ground and finished, and carry three knives with steel-lipped,chip-breakers run in self-lubricating bearings, and have pulleys for two drivingbelts. The side heads are also of steel, and carry three knives, while all thegearing and belting are proportioned to the labor the machine has to perform.

The side spindles are extra large, and run in especially heavy connectedframes, provided with a top-bearing support. The bearings have special oilingdevices for maintaining a constant lubrication. The side heads or frames aremounted on a heavy bed-plate, to which they are gibbed and adjusted by heavysquare-thread screws, which retain them in their places when once set.

The side cutter-heads and the under or lower cylinder are placed betweenfeed-rolls, which are added to feed each piece of timber entirely from the ma-chine. The pressure-rolls upon each side of the upper cylinder are made ofwrouglit-iron, very heavy, and weighted with folding levers, so arranged as topresent uniform pressure at all times.

The bed of the machine is fixed, the cylinder and feed-rolls being elevatedby power to the various thicknesses of lumber to be planed, either simultane-ously or independently of each other. The feed is of the most powerful kindknown, consisting of a revolving traveling bed made of slats, of the best cold-blast iron, the slides on which they move being faced with hardened steel, withaccurately ground faces. In addition to this are two pairs of large feeding rollsdriven by a powerful train of expansion gearing.

The eccentric connection with the front pressure-roll, by means of the lever,permits of an instant control of the feeding-in mechanism of the machine, allow-ing sills varying from }i/' to 2" in thickness to follow one another without anychange in the machine, and to be finished at a rate of SO' per minute.

The power-driven feed-rolls automatically raise and lower by power, areheavily weighted, and operate freely in whatever position placed, the connec-tion being such that at whatever part of the platen the material is fed throughthe expansion gearing is always retained in line. A heavy chip-breaker is addedfor preventing the tear when Avoi’king yellow-pine sills. The machine is 20'long, and weighs about 18,000 lbs. The countershaft is placed so as to insuregood, long belts for the cylinder and feed.

The tight and loose pulleys are 20"xlo", and should make 900 revolutions.