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Manufactured By:
Pearson Crosby
Pomfort, NY; Fredonia, NY; Brooklyn, NY; New York, NY
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Title: |
1853 Article- Pearson Crosby, |
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Source: |
Scientific American, V 8 #17, 08 Jan 1853, pg. 132 |
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Insert Date: |
11/8/2014 8:21:14 PM |
IMPROVEMENTS IN SAWING MACHINES
The annexed engraving is a perspective view of an improvement in Sawing Machinery, invented by Pearson Crosby, of Fredonia, N. Y., to whom a patent was granted for the same in April, 1851, but which has not yet been brought prominently before the public. The nature of the invention consists in making a circular saw with both faces convex, so that it will present a thin edge, where the teeth are cut, to avoid waste of the lumber, and reduce the resistance in cutting, and be gradually thicker towards the shaft to give the requisite thickness, to prevent" buckling" and insure a steady motion at the periphery, when this is combined with a fixed gauge placed near the periphery of the saw on that side of the shaft opposite to where the lumber is presented to the teeth, so that the said gauge shall separate or spread the two parts of the planks, while they are being sawed, and thus prevent them from binding against the faces oi the saw.
A is a neat strong saw frame; B is the driving belt communicating from the shaft of a steam engine or water wheel. It gives rotation to the shaft of the saw, C. D is the fixed beveled gauge; B' is a belt running from a small pulley on the spindle of the saw around a pulley on the shaft of the cone pulley, M. N is a belt running from the cone pulley to the one, L. O is a shipper for moving the said belt from the least diameter of M to its greatest, and vice versa, so as to vary the speed of the cone pulley, L. The shipper slides on a rod, P, and is moved when required by turning the screw, Q. The pulley, L, has a pinion on its spindle which gears into the wheel, K, and moves it. On the shaft of said wheel is a bevel pinion (unseen) which gears into the bevel wheel, J, and gives motion to the vertical shaft, I, on the upper end of which is a cog wheel, which meshes into similar wheels on the base of the spindles of the back feed rollers, F F. These rollers take in the planks at the front, F' F'. There is a knuckle I or loose collar at the neck of spindle, to allow for the vibration of the feed rollers for planks having irregularities. The feed roller can also be set further from, or nearer to, one another, for thick and thin planks—there are slots in the bottom, plate to allow the spindles of said rollers to be so moved, and the screw, G, working in the side plate of the roller frame, graduates the play of said rollers. D' is a trunk to carry off the saw-dust. The screw, G, has a spring on it of sufficient tension to allow the rollers to play, and yet bend out the warpings in a plank, and insure its presentation in a proper manner to the edge of the saw, so that the part of the plank slit will be of equal and uniform thickness.
The following is the claim of this patent, "Making the saw with both faces convex when combined with the guide, D." This is a very excellent combination for slitting planks by a circular saw, and must commend itself to all concerned.
More information may be obtained by letter addressed to the patentee.
US Patent: 8,022 |
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