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Title: |
1857 Image-L. Wright Machine Works, Scroll Saw |
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Source: |
Transactions of the American Institute of the City of New York 1857 pg 128 |
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Insert Date: |
3/26/2011 5:51:31 PM |
The points of superiority claimed in Wright's Patent Scroll Saw are:
1. The manner of connecting the saws with the machine. This is simply done by slipping one end of the saw through the table, and hitching it on to the cross-head at the top of the pitman, and hitching the other end to the bottom of the cross-head, in the slides above the table. A great deal of time is saved by this arrangement, especially in sawing open work, for the saw is instantly changed from one place to another.
2. The mode of straining the saw by a spring above, is worthy of particular note. This gives a clear table for sawing work of any length.
3. The saw and spring being attached to different sizes of pulleys, the saw to the large one in the centre, and the spring to the smaller ones on each side, permits the saw to have all the stroke required, while the spring only moves about one-third the distance. On this account the spring may have any degree of strength necessary, and vibrate much more rapidly than it could be made to do, if it was required to traverse the whole distance the saw moves. Again, the slight motion of the spring saves the trembling of the building, which is so unpleasant where other saws are in use.
4. The simplicity and compactness of the head, is a valuable peculiarity. It embraces the foot, raised or lowered by the gearing at the top, for holding different thickness of stuff; the revolving guide block, with slots in the outer edge, in which the saws of any width are held steady while in operation; the slide, hung on a pivot at the upper end of the shoe, and held by a set screw near the bottom, in which slide the cross-head, to which the saw is attached, is made to move. If the bottom of the slide is thrown forward, the saw, in passing down the plane, strikes ahead; thus, for sawing fast, any desirable amount of rake is given to the saw. The whole head may be raised or lowered for saws of any length, by loosening a set screw in the back of the post.
5. The saws are not liable .to be broken by the pin in either end giving way; for if the upper pin fails, the saw drops through under the table. If the lower one breaks, the saw is drawn up by the spring above the table, and receives no other injury. A silver medal awarded. Patent # 12,176. |
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