IMPROVEMENTS IN THE ARRANGE- MENT AND CONSTRUCTION OF MACHINERY OR APPARATUS FOR SAWING TIMBER
Year: 1866

page_text: PROVISIONAL SPECIFICATION left by James Lockhead at the Office of
the Commissioners of Patents, with his Petition, on the 7th September
1866.
I, JAMES LOCKHEAD, of the City of Glasgow, North Britain, do hereby
declare the nature of the said Invention for "IMPROVEMENTS IN THE ARRANGE-
MENT AND CONSTRUCTION OF MACHINERY OR APPARATUS FOR SAWING TIMBER," to be
as follows:-
This Invention consists in applying additional guides or steady pins to the
top of circular saws in order to control and prevent vibration or warp in the
revolution of the saw or saws during the process of cutting timber. When
using a series of saws upon one spindle I insert a small flat palm or arm
between the saws above the wood when under the process of cutting, whereby
I gain the advantage of steadying the saws above the wood, each palm or
arm has two scrowed holes formed therein, into each of which I fix a guide
pin of wood or other suitable material so that each saw in the series is
embraced between such pins. By the aid of these double pins I am enabled
to control each saw separately, and thereby keep it to the true line of cutting.
I also insert these screwed pins under the wood in a line with the level of
the saw bench, and also at the bottom of the saws; I also apply sciowod pins
to control the outer sides of the end saws of the series.

page_text: Another part of this Invention relates to the construction of the saw bench,
and consists in the adaptation of a double feeding apparatus consisting of a
rope upon a winding barrel and a pair of horizontal fluted rollers; the rope is
attached to the further end of the plank or batton, which is drawn through the
saws until it enters the feed rollers at the back of the saws, and as the motion
of the feed rollers is a little quicker than the barrel the rope falls slack and
the catch box is then thrown out of geer, the rollers alone carrying on the
feeding process, whilst in the meantime the rope is at liberty to be attached to
a fresh plank or batton, thus giving the advantage of a continuous feed and
obviating the necessity for waiting until one plank or batton is through the
saws before it can be drawn off the barrel in order to be attached to another.
Another advantage of this arrangement of back feed rollers is that all
danger of the wood coming back over the saws is prevented, and by using
only a rope feed in front of the saws the bench is always clear for all ordinary
circular saw work, either with a single or a series of saws, so that by merely
putting back the fence timber of various breadths can be passed through the
series of saws that may then be working; the bench may be worked with
double or single feed as may be required. I further propose to use in
connection with the aforesaid arrangement a hollow saw spindle, and when
necessary to employ a jet of water passing through the entire length of the
spindle, which assists in keeping the bearings of spindle cool. The water
may also be discharged through holes in the collars and packings between
the saws, which will keep the several parts cool and in proper working order.
This Invention is applicable not merely to the working of a single saw but
to two, three, or more saws working simultaneously upon one spindle.