US72763A - Improvement in cibcular-saw mills - Google Patents

Description

nitrntats @strat @fitta JOHN TODD,- or BELLnroNTE, YPENNsrmniNA, AssIeNon' To HIMSELF AND 'WILLIAM r. DUNCAN, or sans PLAGE'.

Letters Patent No. 72,763, dated- Deeember 3l, 1867, Y

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TO ALL WHOM IT MAY CONCERN: I

Be itknown that I, JOHN TODD, of Bellefonte, in the county of Centro, and State of Pennsylvania, have invented certain new and useful Improvements in Sawing-`Apparatus; and I do hereby declare tho following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, inaking a part of this specification, in whichv Figure 1 represents a top plan of a sawing-machine.

Figure 2 represents a-longitudinal vertical section through the same.

Figure 3 represents a vertical transverse section. v

Figure 4 represents a vertical longitudinal section, showing in black and in red lines the diiferent positions of the working parts.

Figure 5 representen detached View of the connection of the pivoted and weighted lever with the pivoted rack or segment-frame that supports the shafts of the frietlional driving-wheels at one of their ends, the opposite ends being supported on the main frame. l

Similar letters of reference, whore they occur in the separate figures, denote like parts in all of the drawings.

My invention consists in the'manner in whichI hang, adjust, and operate the frame that supports those ends of the shafts that carry the friet-ional feeding and backing-wheels, so that the latter may he thrown into or out of action with the drive-wheel, at the will of the operator, whilst the weighted lever will, when not controlled by the operator, hold both friction-wheels out of aetien'with the drive-wheel, as will be explained.

To enable others skilled in the art to make and use my invention, I will proceed to describe the same with reference to the drawings.

A represents avrcctangular frame, for holding the saw, andngearing that drives it, and feeds up the log and runs back the carriage. B is the saw-shaft, on which is the pulley C, by which it is run. The saw D is placed ono-ne of theprojectng ends of the shaft, and the pulleys l 2 3 4 on the other end. The shaftE receives the motion which feeds up-the carriage, bolt, or log to the saw, and runs it back again to be set for anew kerf or4 throughf Any of the known ways of holding the log or bolt to the carriage, or head and tail-blocks, may be used. The saw-shaft B and the feeding and reversing-shafts E run in permanent bearings. The other revolving shafts of the apparatus run in yielding bearings, as will be explained. From the pulley 1 on the shaft B, an endlesslbelt, a, extends to and passes over a pulley, 5, on a shaft, F; and from the pulley 2, on the saw-shaft, au endless belt, I, passes to AandV over a pulley, 6, on another shaft G, there being other pulleys, 7 8, on said shaft, of different diameters as are those 1 2 3 4, so as to change speed or motion in the usual way. The journals of the shafts F G, near their pulley-ends, run in pivoted or swinging boxes c, so that the oppositeV ends may rise and fall without cramping or bindingrthe shafts. The pulley-ends of these shafts rest and rotate in journalboxs, arranged on the main frame. Their other ends are supported and turn in swivelling boxes z', on a second frame, H, which is pivoted to the main frame by means of the rod or band, on which it can swing or vibrate. On the front of the hinged frame H there is a curved rack, e, and on a eross-rod, I, that turns invsupportsff, connected to and adjustable on the main frame, there is a'segment, y,that works in said rack, by turning the lever L so as to raise or lower the free end of said frame H, as may he required. On the feed-shaft E there is a-ilanged wheel,iJ, on or against the exterior of which the wheel or friction-pulley j, ou the end of the shaft G, can work or run, to turn said wheel J and shaft E, and against the interior or under side of which rim or ange, the friction-wheel or pulley c on the shaft I" can work or run, to turn said wheel and shaft in a contrary direction, the wheely'making the feed of the carriage, and the wheel lc running it back. When the frame H is raised up, the wheel c is in action, andthe carriage or log is run back. When the frame l-I is lowered, the wheel j is in action, and the carriage or log is fed up to the saw. But there is another inactive position for h oth of the wheels, necessary, so that neither shall work, which is obtained asfollows: To the shaft d, and in a. recess in the rear of the frame-piece H, there is pivotcd a lever, K, upon which there is an adjustable counterpoise, L, and below this counterpoise or weight a support, l\I, so that when the weight is on the support, neither of the friction-wheels j k is in contact with the driven wheel ,Land-then there is no motion given to the shaft E. The

pivoting of the lever K.to the frame H, enables the weight to raise up the frame'to a xed or given height, whilst the frame can be further raised up, independent of 'the lever K, by means of the lever h, segment g, and rack' e. -m is a brace, for holding the wheelj in action with the wheel J, when the `operator desires to do so.

What Ivclaim as new, and desire to secure by Letters Patent, is-

Ip combination with the hinged frame H for moving the frictional feed and backing-wheels into and out `nf action with the drive-wheel and its shaft, the pivoted weighted lever K, jointed to the frame as described,

and its support M for holding both of said wheels out of action, substantially as and for the puposc described.

JOHN TODD.

Witnesses:

A. B.' SToUGHToH, EDM. F. BROWN.

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