US142339A - Hibam a - Google Patents

Description

. laid upon the floor G of a saw-mill.

HIRAM A. HOLMES, OF EPSOM, NEW HAMPSHIRE.

SiiViPROYEMENT IN MACHINES FOR SAWING CLAPBOARDS.

Specification forming part of Letters Patent No. 142,339, dated September 2, 1873; application filed July 5, 1873.

Figure 1 is a top view, Fig. 2 a front elevation, and Fig. 3 an end elevation, of my clapboard machinery and saw-mill carriage and their attachments.

The machinery hereinafter described for supporting and intermittently turninga log is represented as combined with the carriage of a saw-mill, itbeing intended by such to adapt said saw-mill to sawing a log into boards or timber in the ordinary way, or to the sawing of it into clapboards, as occasion may require.

In the drawings, A denotes a common sawmill carriage, supported on ways or rails B B On the top of this carriage there is placed, in manner as shown, the main frame C of the clapboard. log-carryin g machine, such main frame being provided with a series of screw-clamps, D, for clamping it in position upon and to the saw-mill carriage. The said main frame, constructed as represented in the drawings, has arran ged within it, in manner as shown, an auxiliary frame, E, the two frames being so applied together as to admit of the auxiliary one being moved vertically within the :main one, and guided in its movement by the latter. In order to elfect these movements of the auxiliary frame, which are for the purpose of properly regulating the altitude of the log-arbor with reference to the saw of the mill, the two frames are provided with suitable mechanism-that is to say, there is applied to the main frame a horizontal shaft, a, furnished with two spur-pinions, b b, to work in toothed racks c o fixed tothe posts of the auxiliary frame, all being arranged as represented. Furthermore, the said shaft a has iixed to it at one end a gear, d, which engages with a pinion, e, arranged on a pivot, f, projecting from one ofthe posts of the main frame, the said pinion being provided with a crank, g, for effecting its revolution. A retainingpawl, h, pivoted to the last-mentioned post,

serves to arrest back motion of the gear d.

The auxili'ary frame has an arbor, t', and a center, 7c, arranged as shown, the arbor on its inner end being provided with a dog, m, to connect it with the end of a log, L, such log at its other end turning freely on the center On the arbor 'i there is fixed a geana, that engages with a pinion, o, carried by a shaft, p, arranged and provided with a ratchet-whee1, q, all being as represented. There is also upon the said shaft p a rocker-lever, r, provided with two or any other suitable number of impellingpawls, s s, to engage with the ratchet-wheel. The upper arm of the said lever rests upon an adjustable stop, t, held to the frame by a clamp-screw, a, going through a slot in the stop, all being as shown. To the lower arm of the lever r there is pivoted a pendulous arm, r, connected to the lever by a rule-joint, by which the arm, when in a vertical position, is estopped from moving backward relatively to the lever, although such arm is capable of being moved forward on its pivot without at the same time moving the lever. To operate with the said arm is a stationary cam, w,formed as shown, and fastened to the head of a stand ard, w, erected on the door, all being as repre sented.

XVhile the carriage supporting the log is in the act. of being moved forward, the pendulous arm will be carried in contact with the cam fw, and will swing or pass it without creating any movement of the pawl-lever on its fulcrum, but, during the return movement of the carriage, the pendulous arm will be again moved in contact with the cam, which will so move it, and cause it to move the lever r, as to cause it to force the impelling pawl or pawls against the ratchet-wheel, and revolve it the requisite distance for eecting the turning of the log the requisite degree for it to receive the screw, which, while passing through the log, will out it radially. Y

By means of the adjustable stop and the pendulous arm, arranged with the pawl lever, as explained, the necessary movement of the latter can be obtained .for any log. As the logs vary in diameter the auxiliary pinion has to be raised or lowered inorder to properly adjust any log to the saw. It will be seen that the larger the radius of the log the less must be the movement 0i the pawl-lever, all of which will be regulated by the pendulous arm. The higher it is raised the less, while it is being moved by the cam, will it move the lever, the back movement of the lever being regulated by the adjustable stop.

I am aware that, for sawing a log into elapboards, a machine provided with a circular saw, and having mechanism for holding a log and intermittently turning it and moving it forward and backward to enable the saw to eut through it, is not new; therefore I make n0 claim to such a machine.

I have applied to a saw-mill carriage a meehanism to enable it to support a log and so move it relatively to its saw as to cause the latter to separate the log into olapboards, thus enabling the carriage to be used either in sawing com mon boards or common timber having parallel sides or in sawing elapboards, therebysavin g room in a saw-mill, and the expense of an additional carriage and its operative mechanism necessary for the clapboard-maehine as heretofore used.

I therefore claim- The combination of the saw-mill carriage A, the clamps D, and the separate stationary cam fw, with the main and auxiliary frames C E, arranged together and provided with meehauY ism, substantially as described, for adjusting the altitude of the auxiliary frame, and for supporting and intermittently revolving a log, all as and for the purpose specified.

HIRAM A. HOLMES.

Witnesses It. H. EDDY, J. R. SNOW.

Images