IMPROVEMENTS IN HORIZONTAL SAW-FRAMES
Year: 1880

page_text: LETTERS PATENT to Thomas Nield Robinson, of the Firm of Messieurs
Thomas Robinson and Son, Limited, of Rochdale, in the County of Lancaster,
for an Invention of "IMPROVEMENTS IN HORIZONTAL SAW-FRAMES."
PROVISIONAL SPECIFICATION left by the said Thomas Nield Robinson
at the Office of the Commissioners of Patents on the 23rd December 1880.
THOMAS NIELD ROBINSON, of the Firm of Messieurs Thomas Robinson and Son,
Limited, of Rochdale, in the County of Lancaster. "IMPROVEMENTS IN
HORIZONTAL SAW-FRAMES."
In performing my Invention I use two saws instead of one, and I use double
the usual number of standards for carrying the saws, the additional standards
being similar in construction to (but placed facing) the ordinary standards.
One saw is carried in bearings constructed and fitted in the usual manner, and
the second saw is mounted in a similar manner on the additional standards at the
front of the machine; the saws are placed as near together as convenient, so that
they may enter the timber as nearly as possible simultaneously; they are adjusted
by screws and wheels to saw boards of the same or different thickness, and the
adjusting screws and wheels may be geared so as to raise and lower the saws
together or separately.
To drive the saws I employ connecting rods and a double throw crank balanced
in equilibrium working in adjustable bearings carried by duplicate standards at
the end of the machine; by this means two boards are sawn each time the log
passes through the machine, and the saws may be run at a higher speed as the two
saws balance each other.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, and of
an Order of the Lord Chancellor, filed by the said Thomas Nield Robinson
in the Great Seal Patent Office on the 30th July 1881.
THOMAS NIELD ROBINSON, of the Firm of Messieurs Thomas Robinson and Son,
Limited, of Rochdale, in the County of Lancaster. "IMPROVEMENTS IN
HORIZONTAL SAW FRAMES."
In performing my Invention I use two saws instead of one, and I use double the
usual number of standards for carrying the saws, the additional standards being
similar in construction (but placed facing) the ordinary standards. One saw is
carried in bearings constructed and fitted in the usual manner, and the second saw
is mounted in a similar manner on the additional standards on the front of the
machine; the saws are placed as near together as convenient, so that they may
enter the timber as nearly as possible simultaneously; they are adjusted by screws
and wheels to saw boards of the same or different thickness, and the adjusting
screws and wheels may be geared so as to raise and lower the same together or
separately. To drive the saws I employ connecting rods and a double throw crank
balanced in equilibrium, working in adjustable bearings carried by duplicate
standards at the end of the machine; by this means two boards are sawn each time
the log passes through the machine, and the saws may be run at a high speed as
the two saws balance each other.
And in order that my Invention may be fully understood and readily carried
into effect, I will describe the accompanying two Sheets of Drawings, reference
being had to the Figures and letters marked thereon.
On Sheet 1, Fig. 1 is a front elevation; Fig. 2 is a plan; and on Sheet 2,
Figs. 3 and 4 are end elevations of a double horizontal saw frame, to which my
Invention is applied. A, A, are the standards having vertical slides, on which the
guides b for the saw frames C are mounted; these guides may be adjusted simul-
taneously or separately by screws and wheels to saw boards of the same or different
thickness; d, d, are the connecting rods which connect the saw frames C to a
double cranked shaft e balanced in equilibrium; at each end of the double cranked
shaft e is fixed a pulley e'; there are adjustable pulleys f to guide the bands which
drive the shaft e; this shaft turns in bearings g,g, which may be raised or lowered
on slides on the standards h, h.
The log carriage is constructed and actuated as usual.
By the use of my Invention two boards may be sawn as quickly as one, the
saws entering the wood almost simultaneously, and as each of the two saws moves
in the opposite direction to the other the machine may be run at a very high speed
with less vibration that when a single saw is used. The two pulleys e¹, e¹, ensure
steady driving and prevent undue strain on either of the cranks.
Having stated the nature of my Invention, and described the manner of
performing the same, I declare that I claim,-
The double cranked shaft e for actuating two horizontal frame saws, as shown
and described.
In witness whereof, I, the said Thomas Nield Robinson, have hereunto set
my hand and seal, this Twenty first day of June, One thousand eight
hundred and eighty one.
THOMAS NIELD ROBINSON. (L.S.)