An Improved Machine for Cutting the Teeth of Files and other similar Toothed Articles.
Year: 1887

page_text: Date of Application, 8th Jan., 1887
Complete Left, 8th Oct., 1887
Complete Accepted, 11th Nov., 1887
An Improved Machine for Cutting the Teeth of Files and other
similar Toothed Articles.
1, HENRY THEAKER of Cornish Street, Sheffield, in the County of York File Machine
Manufacturer, do hereby declare the nature of this invention to be as follows:-
The Machine consists of a suitably constructed Standard, carrying a hammer which
is lifted by a cam preferably fixed upon the main shaft, and compresses a spring
which reacts upon the hammer when it is released by the cam.
The force of the blow is regulated by compressing or releasing the spring; this is
done by a hand wheel and vertical shaft in connection with a wheel and pinion,
which when rotated, travel up and down a screw and act upon the said spring.
The hammer strikes upon the head of a chisel or cutter which is held in an
adjustable arın.
The chisel is held between a pair of clamps or fingers, the inside faces of the
clamps being composed of some elastic material, such as rubber for example, thus
when the chisel or cutter receives the blow of the haminer, the elastic faces allow it
to descend according to the strength of the blow given, and to spring back to its
normal position when the hammer is withdrawn.
Thus the chisel is not held in the hammer in the usual manner, and so carried up
and down with it, but is held with a certain amount of elasticity just above the
article to be cut.
The feed motion is imparted either direct to the article itself so as to cause it to
move forward at the desired speed over the anvil, or to the bed upon which the
article may be fixed; in either case it is accomplished by means of friction wheels
driven at the speed required by any suitable intermediate gearing.
The Friction wheels grip each side of the travelling bed, such as those used in
ordinary file cutting machines, but I may apply them in a direct manner to the sides
or edges of such articles as sickles, and so cause them to pass over the anvil upon
which they are cut.
I wish it to be understood that by the term "other similar toothed articles "-
included in the title I include "punching" rasp teeth, tedding sickles, and "scratting”
reaper sections, and spirals for dressing cloth.
32
ROBT. F. DRURY,
Agent for the Applicant.

page_text: An Improved Machine for Cutting the Teeth of Files and other
similar Toothed Articles.
I, HENRY THEAKER of Cornish Street Sheffield in the County of York File
Machine Manufacturer do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained in
and by the following statement:
My invention has for its object to simplify the construction of machines for cutting
the teeth of Files and rasps, and serrating other articles such as sickles, reaper
sections and the like; also to hold the chisel or cutter in a manner approaching that
of the human hand having a certain amount of pliancy or flexibility.
And in order that the invention which I shall now proceed to describe may be
clearly and fully understood I shall refer from time to time to the annexed sheet of
drawings which illustrate a Machine made according to this my invention, for
file cutting.
Fig. 1, is an elevation of a filecutting machine made according to my invention.
Fig. 2, is an enlarged plan of the bed and feed rolls.
Fig. 3, is an enlarged view of fingers or chisel holder.
In carrying out my invention in making a file cutting machine such as is illustrated
in the drawings, I make a standard or body to carry the mechanism, of any suitable
design, such as a Column A, standing upon a base-plate B, carrying a headstock C,
which may be either fixed or adjustable in position.
At one side of the headstock, and attached to a shaft D, which passes through
the headstock is a pully E, a clutch F, and a driving pulley G; on the other end
of the shaft is a cam H, having one or more lifts as desired; the pully G, is loose
on the shaft, but may be instantly connected thereto by means of the clutch F,
actuated by the foot lever I.
At the cam end of the shaft an adjustable head J is fixed upon the headstock C, in
which is fitted a sliding hammer K, the faces of which are removable; the force of
this hammer is regulated by means of a spring L, which is compressed or released by
the hand wheel and screw M, but the spring may be acted upon by other mechanism
if preferred.
From a suitable position on the head J, a short shaft or arm N depends, and carries
the fingers or chisel holder O, an enlarged view of which is shown in Fig. 3. It
consists of an adjustable slide having two projecting fingers a a, the inside of each
finger having a lining or strip of rubber or other elastic inaterial b, held in position
in any suitable way.
The Chisel P, is held, by simply forcing it between the strips of rubber before
mentioned to the required position just above the file blank, and thus when the chisel
receives the blow of the hammer, (which is exactly over the chisel) the elastic faces b
allow it to be driven forward onto the face of the file-blank, and to recover or
spring back to its normal position ready for the next blow. Although I have said a
rubber strip should be in each finger, in some cases there may be only one elastic
side used, and there may be two depending.arms N, to carry the chisel holder.
It will thus be seen that I have discarded the usual plan of carrying the cutter or
chisel in the end of the hammer or the reciprocating slide or ram, but hold it
stationary by an elastic medium close above the article to be cut.

page_text: This method of holding the chisel or cutter without set screws or like appliances,
enables the workman to withdraw it from the fingers, whet it, and replace it with the
greatest ease and rapidity.
The table may be of any design such as the one shown, and carried by the same
base plate B. The feed motion is constructed as follows, a tubular bracket R, carries
a shaft S upon which a grooved wheel T is fixed corresponding with the pulley E,
and the two are connected by a cord or gut band, but these grooved wheels may
have
toothed wheels or chain gearing substituted for them if preferred, and for small
machines the driving power may be transmitted by Hand or Foot mechanism.
The shaft S, on the end that projects under the table Q, has a right and left hand
worm gearing into corresponding worm wheels U, U, secured on two vertical shafts
on the tops of which are fitted friction wheels V, which work close upon the table top
as shown.
The outer friction wheel and its vertical shaft are carried by a sliding piece or die,
having a short lateral movement to and from the other friction wheel; the weighted
lever W, acts upon and keeps the movable wheel to its nearest point to the
stationary wheel.
The travelling bed X, enlarged in Fig. 2, is placed between the friction wheels V, V.
which grip it sufficiently tight for the purpose, and propel it forward when motion is
communicated to the wheel T.
Although I have shown the travelling table or bed X with bevilled sides and the
edges of the friction wheels correspondingly shaped so as to hold the said bed down
upon the table while it propels it forward, I may vary the configuration of the friction
wheels to suit the various purposes to which the machine may be from time to time
applied they may therefore be made parallel, taper, hollow or concave, or otherwise
as occasion requires. They may also be made either concentric or eccentric to their
shafts so as to vary the speed of the traverse or feed, such as is required when cutting
the points of files. An extra pair of guide wheels may also be used should it be
found necessary, and the travelling bed X may be dispensed with for example when
when cutting (or tedding) the curved blades of sickles, in which case the blade itself
would be gripped between the friction wheels.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
:-
1-The improved Machine for cutting the teeth of files and other analogous articles
substantially as hereinbefore described and as illustrated by the drawings.
2-In Machines for cutting Files and executing other like serrating processes, the
method of holding the Chisel between elastic pads without Set Screws or other
holding appliances for the purpose specified and substantially as described.
3-In Machines for cutting Files, and for executing other like serrating processes,
propelling (or feeding) the article, by means of friction-wheels which are caused to
grip the article or its bed between them, substantially as described and for the
purpose specified.
4-In Serrating Machines, a feed motion consisting of a pair of friction wheels
upon shafts, driven by worm wheels and worms, the said friction wheels, or one of
them having a lateral motion, controlled or partly so by a weight or its equivalent
substantially as herein described and shown.
1
FIL 1
1007
ROBT. F. DRURY,
Agent for the Applicant.