IMPROVEMENTS IN SAW SETTING MACHINERY
Year: 1878

page_text: LETTERS PATENT to Lionel Varicas, of 24, Chancery Lane, in the County of
Middlesex, Patent Agent, for the Invention of "IMPROVEMENTS IN SAW
SETTING MACHINERY." A communication from abroad by William Howard
Doane, Manufacturer, of Cincinnati, in the County of Hamilton, in the State
of Ohio, one of the United States of America.
Sealed the 14th February 1879, and dated the 9th October 1878.
COMPLETE SPECIFICATION filed by the said Lionel Varicas at the Office of
the Commissioners of Patents on the 9th October 1878.
LIONEL VARICAS, of 24, Chancery Lane, in the County of Middlesex, Patent
Agent. "IMPROVEMENTS IN SAW SETTING MACHINERY." A communication from
abroad by William Howard Doane, Manufacturer, of Cincinnati, in the County of
Hamilton, in the State of Ohio, one of the United States of America.
This Invention relates to a saw setting machine, more especially intended to set
the teeth of band saws, and organized with an automatic feed mechanism to feed
the saw along as fast as the teeth are set.
The improvement consists of certain novel features of construction whereby the
machine is adapted for operating with one or two hammers. The force of the blow
of the hammer or hammers can be regulated, the feed can be nicely adjusted, the
hammers can be shifted laterally to adjust them with reference to the pitch of the
saw teeth, and general structural simplicity is attained.
In the annexed Drawings,
Figure 1 is a perspective view of the improved saw setting machine.
Figure 2 is a rear elevation, partly sectional.
Figure 3 is a side elevation, partly in section.
Figure 4 is a plan view.
The same letters of reference indicate like parts in all the Figures.
The stand or frame of the machine is composed of the base plate A and a pair of
unrights A1 A1 having the conformation hest seen in Figures 1 and 2.

page_text: The machine illustrated is organized with two hammers B and C, the helves B'
and C of which are respectively pivotted on pins b and c between the legs of the
uprights A near the base.
The hammers operate in opposite directions to strike on the anvils D and E which
are placed on off-sets in the upper ends of the uprights A¹, and secured by screws d'
so that they may be readily removed for substitution or repairs.
The projecting portions d and e of the anvils are bevelled to correspond to the
bevel of the ends of the hammers, and are arranged to stand one slightly in advance
of the other to permit them to act properly with the hammers whose points are
made to strike past each other.
The hammer helves are adapted to slide on their pivot
hammers may be adjusted laterally to regulate the space
points in exact accord with the pitch of the saw teeth.
and c, c, passing through the legs of the uprights A'
hammers in position after proper adjustment.
pins b and c so that the
between their striking
Temper screws b', b¹,
serve to maintain the
The hammers aro thrown toward the anvils by U shaped springs F which are
placed loosely in recesses in the upper side of the base plate, and engage by means
of a hook at one end a corresponding hook on the helve of the hammer, as clearly
shewn in Figure 2.
The hammers are turned back preparatory to delivering blows by the cams G
and H formed in one piece, preferably with the eccentric or cam I, whose office will
be presently described. These cams are secured on a shaft K turning in bearings
in the uprights A¹ and provided with a hand wheel K¹ at one end.
The cams G and H operate on the hammer helves through the studs L which are
connected to the helves, and are adapted to be projected more or less so that the
hammers may be thrown out of action altogether or made to strike a blow of
greater or less force. To this end the outer end of stud L has an elongated forked
head which engages a screw L' between a couple of collars, as best seen in
Figure 2. The screw enters a threaded hole in the helve, so that by turning it in
one direction or the other the stud L can be adjusted to project more or less through
the helve.
The saw is fed as fast as the teeth are set by a pawl M pivotted on a bolt m
which is seated in a slot n of a lever arm N, the bolt m being provided with a thumb
nut m' to clamp it to the lever arm at any required point in the slot. A temper
screw m³ is set up against bolt m after it has been properly adjusted as an additional
safeguard against accidental shifting.
The pawl is placed between a collar and washer so that it can freely turn on the
bolt at all times, it being retained in position by a nut, as shown.
The lever arm N is fulcruined at n³ in the legs of the uprights A'. From its hub
a curved arm N¹ projects under the eccentric or cam I, and another arm N2 projects
in the opposite direction. A set screw n³ is fitted in arm N to bear with its foot
upon the base plate. By adjusting this set screw the arm N may be raised or
lowered with reference to cam I, whereby the throw of lever arm N occasioned by the
action of the cam I on arm N¹ can be regulated. The set screw carries a jam nut n³
to lock it after adjustment. A stiff spring O acts on lever arm N in opposition to
cam I.
The throw of the lever arm N is adjusted to the pitch of the teeth, and so as to
feed the saw by the pawl the distance of two teeth after each blow of the hammer
or hammers, and as it is desirable that the pawl should act as close up to the anvils
as practicable, it will be necessary to shift the position of the pawl on the lever arm
whenever the throw of the latter is adjusted.
The anvils are close together, just sufficient space being left between them to
admit of the passage of the saw, the back of which is supported upon guides P, P¹,
attached to opposite sides of the uprights A¹.
The guides are provided with slots o to admit of vertical adjustment, and are
secured by clamping bolts o¹ which pass through said slots into taps in the
uprights.

page_text: The cam I is so timed with reference to the cams G and H that it will throw the
lever arm forward to feed the saw just after the hammers are beginning to be
turned back by the cams G and H and complete the throw before the hammers
deliver the blow.
What I claim and desire to secure by Letters Patent is,-
Firstly. The combination, substantially as specified, of the hammer helve, the
cam, the stud through which the cam acts on the helve, and the screw for adjusting
the stud.
Secondly. The combination, substantially as specified, of the hammer, latterly
adjustable on its fulcrum pin, and the temper screws for maintaining the hainmer in
position after adjustment.
Thirdly. The combination, substantially as specified, of the feed lever, constructed
with two oppositely projecting arms, the cam acting on one of the said arms, the
set screw in the other arm for regulating the feed, the re-acting spring, and the
pawl adjustable in, or in about, the line of feed.
Fourthly. The combination, substantially as specified, of the adjustable lever feed
arm, the pawl, the adjustable pivot pin thereof passing through a slot in said arm,
and the temper screw bearing on said pivot pin.
In witness whereof, I, the said Lionel Varicas, have hereunto set my hand and
seal, this Ninth day of October, in the year of our Lord One thousand eight
hundred and seventy-eight.
LIONEL VARICAS. (L.S.)