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Title: |
1848 Article-J. G. Johnson, Shingle Machine |
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Source: |
Scientific American, V 4 #15, 30 Dec 1848, pg. 117 |
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Insert Date: |
11/3/2014 8:58:58 PM |
This is a machine invented by Mr. J. G. Johnson, of Augusta, Maine, which has justly been praised by all those who have seen it operate and every person who has used it.
Description.—The machinery is adjusted to a frame of 10 feet in length by 3 feet 10 inches in width. On this is placed a moveable carriage EE, which runs on trucks attached to the carriage, F F. B, is the block or bolt of wood to be sawed, and is held in its place by dogs. C, is a piece of wood fastened on the end of the frame, the object of which is to cause the lever D to turn the set shaft one quarter round every time the carriage returns back ; this lever is raised by a piece of wood fastened to the main frame. To this lever is also fastened a hook, which hooks on to the sett shaft. G G, are handles attached to a rod, which Has a cam on it. By turning the handles up the rack is raised out of gear and stops the carriage while the operator supplies another bolt or block of wood. The sett shaft has a dog on each end placed at right angles so as not to set but one of the blocks at a time. Those dogs move two gauges that are secured to the headstock which holds the block or bolt of wood. The carriage is fed by a decreased motion received from the saw shaft. |
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1848 J. G. Johnson, Shingle Machine
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