AN IMPROVED SAW SETTING MACHINE
Year: 1879

page_text: LETTERS PATENT to Thomas Holt, of Rochdale, in the County of Lancaster,
Machine Maker, and Thomas Duncan, of Oldham, in the same County,
Mechanical Engineer, for the Invention of "AN IMPROVED SAW SETTING
MACHINE."
PROVISIONAL SPECIFICATION left by the said Thomas Holt and Thomas
Duncan at the Office of the Commissioners of Patents on the 15th July 1879.
THOMAS HOLT, of Rochdale, in the County of Lancaster, Machine Maker, and
THOMAS DUNCAN, of Oldham, in the same County, Mechanical Engineer. AN
IMPROVED SAW SETTING MACHINE."
"
In performing our Invention, which is particularly applicable to band and mill
web saws, we make use of a double acting lever, on which are two setting blocks
working one on each side of the saw in conjunction with two stationary blocks
through which the saw passes, and so arranged as to either take off or put on the
set of the saw without making any alteration or changing of the blocks. On the
same lever we place an adjustable stud which works a slide on which is a catch for
feeding the saw, which can be easily adjusted to suit any pitch of tooth.
The stationary blocks are fixed on to a base plate in line with a groove cut in a
projection on the base plate through which the saw passes; the saw is kept at the
proper elevation by two set screws working in the lower side of the groove, by
which the saw is raised or lowered, and it is held in position by a bracket acting on
the top side of the teeth.
On the lever is a hollow boss which forms its fulcrum, in which is a slot for the
saw to pass through which is being operated upon.
The lever is worked from side to side by hand or other power to set the teeth,
and at the same time it actuates the slide motion for feeding the saw forward.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Thomas Holt and Thomas Duncan in the Great Seal Patent Office on
the 14th January 1880.
THOMAS HOLT, of Rochdale, in the County of Lancaster, Machine Maker, and
THOMAS DUNCAN, of Oldham, in the same County, Mechanical Engineer.
" AN
IMPROVED SAW SETTING MACHINE."
In performing our Invention, which is particularly applicable to band and mill
web saws, we make use of a double acting lever, on which are two setting blocks
working one on each side of the saw in conjunction with two stationary blocks
through which the saw passes, and so arranged as to either take off or put on the
set of the saw without making any alteration or changing of the blocks. On the
Price Adl

page_text: same lever we place an adjustable stud, which works a, slide on which is a catch for
feeding the saw, which can be easily-adjusted-to-suit any-pitch-of-tooth. The
stationary blocks are fixed on to a base plate in line with a groove cut in a projec-
tion on the base plate through which the saw passes; the saw is kept at the proper
elevation by two set screws working in the lower side of the groove, by which
the saw is raised or lowered, and it is held in position by a bracket acting on the
top side of the teeth, which bracket carries a file for stripping the teeth and making
the saw of an equal width.
On the lever is a hollow boss which forms its fulcrum, in which is a slot for the
saw to pass-through while it is being operated upon.
The lever is worked from side to side by hand or other power to set the teeth,
and at the same time it actuates the slide, motion for feeding the saw forward.
And in order, that our Invention may be fully understood we will proceed to
describe the accompanying Sheet of Drawings, reference being had to the figures and
letters marked thereon. Figure 1 is an elevation, and Figure 2 is a plan of our, saw
setting machine. a is the base plate, and a¹ is the projection in which is the groove
to receive the saw; b, b, are the set screws for raising and lowering the saw; c is the
saw; the file is shewn in dotted lines at d; a2 is the bracket in which is the stud
a³ for keeping the file and the saw in position; e, e, are two setting blocks secured
to the base plate; f is a setting block fixed on the lever; and f¹ is an adjustable
setting block fitted in a slot in the lever; g is the lever; g' is an adjustable stud for
actuating the plate h which carries the catch h¹ for feeding the saw.
The mode of operation is as follows :—
The saw is placed in the groove and adjusted by the set screws underneath to
raise it the requisite height for setting and stripping. The file is placed between
the boss which forms the bearing for the lever and one of the setting blocks, and is
held in position by a stud in the bracket for holding down the saw; the saw is
then drawn through the machine by band to strip the teeth and make the saw of
an equal width. The file is then removed and the saw placed in position for setting
The two blocks on the base plate are stationary and one on the lever is fixed, and
in setting the machine the saw to be operated upon is placed between the stationary
block on the base plate and the fixed block on the lever, with a tooth of the saw in
position for being set by the blocks. The lever is then swung across to the opposite
side, when the movable block on the lever has to be adjusted to the pitch of tooth
on the saw, and the lever is brought back into position again, when the catch for
feeding the saw is adjusted behind a tooth by means of a screw, so that the catch
will pass over and move forward two teeth at cach to and fro action of the lever.
The adjustable stud on the lever is moved further from or nearer to the centre to
give greater or less traverse to the feeding catch; when all the parts are adjusted
the catch moves the saw forward so that one tooth is in position to be set by the
fixed and stationary blocks, and another tooth is in position to be set by the
adjustable block, every to and fro motion of the lever feeding and setting two teeth.
Having thus stated the nature of our Invention, and described the manner of
performing the same, we declare that we claim the machine for setting saws
automatically, substantially as shewn and described.
In witness whereof, I, the said Thomas Holt, for myself and on behalf of the
said Thomas Duncan, have hereunto set my hand and seal, this Thirteenth
day of January. One thousand eight hundred and eighty.