Improvements in Machinery for Pointing or Tapering Pins for Circle, Gill, and Card Combs and the like.
Year: 1893

page_text: Date of Application, 19th Apr., 1893
Complete Specification Left, 18th Jan., 1894-Accepted, 24th Feb., 1894
PROVISIONAL SPECIFICATION.
Improvements in Machinery for Pointing or Tapering Pins for
Circle, Gill, and Card Combs and the like.
I, JOHN STEAD, of Horsforth, near the City of Leeds, in the County of York,
Engineer, do hereby declare the nature of this invention to be as follows:-
In machines hitherto employed for pointing and tapering pins for circle and gill
combs and the like, a grindstone has been employed having a concave surface
(ver this concave grindstone is arranged a wheel, having an indiarubber periphery,
and a stationary segment having an indiarubber interior surface; such wheel and
segment being placed obliquely, in such a manner that, on the wheel being rotated
and suitable lengths of wire being placed between the wheel and the segment, the
said wires are rolled down and their ends brought into contact with the grindstone,
which tapers or points them as they are fed or moved across the working surface.
Such machines, however, are not satisfactory, as the wires have to be run across
many times when long taper points are required, owing to the fact that a smooth
stone must be employed in order to give the pins the required degree of fineness.
It will thus be seen that much cutting power is lost, and a great difficulty is also
experienced in bringing the stone to bear upon the exact part of the pin.
In order to set the wheel and segment at an acute angle for producing a long
taper on short wires, stones of small diameter have to be used, thus having a small
working surface. In order to produce what is technically called the "set," the
wires have to be run through an extra time; and in the case of short tapers, a
groove or hollow has to be cut or rubbed out about the centre of the stone in order
to produce the said "set."
It is to overcome these difficulties that I have invented the following machine,
and by the employment of such machine the points will be produced with more
facility, and such points may be made with a longer and consequently finer point
than those hitherto produced,
According to my invention I mount two axles, one on either side of a main
frame, having their inner ends projecting towards each other within the said frame.
On each of the inner ends of these axles I mount a grindstone, of such a concave
form that, when the two stones are adjacent to each other, they have a working
surface of (or nearly so) the arc of a circle. The axles are mounted in adjustable
bearings in such a manner that the stones may be advanced or drawn back, or
adjusted vertically, independently of each other, thus changing the relative position
of their axes.
These movements may be obtained by mounting the bearings on the
ends of parallel arms, or by mounting the bearings on horizontal slides, and
adjusting the slides by means of screws geared together, and such parallel arms or
horizontal slides are mounted on vertical slides having screw adjustments. All
these arrangements may be adjusted whilst the stones are in motion, consequently
very fine and superior work is obtained. Driving pulleys are mounted on each
axle, thus enabling the stones to be run separately, and if desired at varying
speeds.
Above the stones I mount a wheel and corresponding segment for conveying the
wires across the stones, such wheel and segment being mounted in suitable bearings
in such a manner that the frame carrying the said wheel and segment can be moved
away clear of the stones, by means of a suitable cam arrangement in connection
with a hand lever.
By adjusting the second stone forward relatively to the first stone, each stone
performs a separate operation; the first stone roughly grinding and pointing the

page_text: pins, and the second stone repeating the operation exactly, thus finishing and
smoothing the pins.
The first stone may be of a rough character in order to quickly grind down the
wire during the first part of the operation, and the second stone may be of a fine
character in order to smooth and finish the pins during the latter part of the
operation; or one stone may be hard and the other soft; or one may be a stone and
the other an emery wheel, as may be required to suit the work operated upon.
The second stone may also be made of a smaller diameter than the first stone, in
order to produce longer and finer points on the pins, in which case the stone can be
set closer to the segment and wheel, owing to its smaller diameter. The first
stone may be adjusted to produce the "set," whilst the second stone is brought to
bear on the taper. The short space between the two stones obviates the necessity
of cutting or rubbing out a groove to produce the "set" on card or short tapered
pins.
This machine is equally applicable for grinding, tapering, or pointing all kinds of
wires for various purposes.
Dated this 19th day of April 1892
BREWER & SON,
Loudon and Leeds, Agents for Applicant.
COMPLETE SPECIFICATION.
Improvements in Machinery for Pointing or Tapering Pins for
Circle, Gill, and Card Combs and the like.
I, JOHN STEAD of Horsforth near the City of Leeds, in the County of York,
Engineer, 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 :-
In machines hitherto employed for pointing and tapering pins for circle and gill
combs and the like, a grindstone has been employed having a concave surface.
Over this concave grindstone is arranged a wheel, having an india rubber periphery,
and a stationary segment having an india rubber interior surface; such wheel and
segment being placed obliquely in such a manner, that on the wheel being rotated,
and suitable lengths of wire being placed between the wheel and the segment, the
said wires are rolled down and their ends brought into contact with the grindstone,
which tapers or points them as they are fed or moved across the working surface.
Such machines, however, are not satisfactory, as the wires have to be run across
many times when long taper points are required. It will thus be seen that much
cutting power is lost, and a great difficulty is also experienced in bringing the stone
to bear upon the exact part of the pin required to be acted upon.
In order to set the wheel and segment at an acute angle for producing a long
taper on short wires, stones of small diameter have to be used, thus having a small
working surface. In order to produce what is technically called the "set," the
wires have to be run through an extra time; and in the case of short tapers, a
groove or hollow has to be cut or rubbed out about the centre of the stone in order
to produce the said "set."
It is to overcome these difficulties that I have invented the following machine,
and by the employment of such machine the points will be produced with more
facility, and such points may be made with a longer and consequently finer point
than those hitherto produced.
In order that my invention may be clearly understood, I will proceed to describe
same with reference to the accompanying drawings, in which similar letters refer
to like parts in all the figures.
Fig. 1 is a nart front elevation

page_text: Fig. 2 is a plan with the upper part removed, and
Fig. 3 is a side elevation, shewing a machine constructed according to my
invention.
Figs. 4 and 5 are diagram views.
According to my invention I mount two axles A A', one on either side of the
framework B of the machine, such axles having their inner ends projecting towards
each other within the said framework. On each of the inner ends of these axles A A¹
I mount grindstones C C', of such a concave form that when the two stones are
adjacent to each other, they have a working surface of (or nearly so) the arc of
a circle.
The axles A A¹ are mounted in bearings D D, D' D', which are carried on
horizontal slides E E', the latter being adjustably mounted on the brackets F F.
Adjusting screws G G, G' G' are mounted on the brackets F F', their opposite
ends engaging with the horizontal slides E E', and the said screws G G, G' G'
are coupled in pairs by means of the chain gearing H H'. By turning the
screws G G, G¹ G¹ the horizontal slides E E' are made to move on the brackets F F',
thus enabling the stones C C¹ to be adjusted horizontally.
The brackets F F are arranged to slide vertically in the framework B, such
adjustment being effected by means of the screws J, and fly nuts J¹.
It will be readily seen that by the above arrangements the stones C C¹ may be
adjusted either vertically or horizontally independently of each other, thus
changing the relative position of their axes, and this whilst they are in motion,
consequently very fine and superior work is obtained.
Driving pulleys K K' are mounted on the outer ends of the axles A A', thus
enabling the stones C C' to be run separately, and if desired, at different speeds.
Above the stones C C¹ and on the frame L is mounted the ordinary wheel
and segment arrangement, for carrying the pins across the stones, the said
frame L being fulcrumed at M. To the side of the framework B of the machine
I mount a shaft N having a cam P thereon, which comes in contact with a
T piece R at the required time and raises the frame L with its wheel and segment
away from the stones C C¹, such movement being effected by means of the hand
levers S S'.
The frame L can also be adjusted in a lateral direction by means of the screw V
and hand wheel W. By turning the hand wheel W, the frame X is moved in
either direction, carrying with it the T-piece R and cam P, such cam P being
provided with an ordinary key which slides in a keyway on the shaft N.
By adjusting the second stone forward relatively to the first stone, each stone
performs a separate operation, the first stone roughly grinding and pointing the
pins, and the second stone repeating the operation exactly, thus finishing and
smoothing the pins.
The first stone may be of a rough character in order to quickly grind down the
wire during the first part of the operation, and the second stone may be of a fine
character in order to smooth and finish the pins during the latter part of the
operation; or one stone may be hard and the other soft ; or one may be a stone and
the other an emery wheel, as may be required to suit the work operated upon.
The stones may be made of different diameters as shown in elevation at Fig. 4,
which enables longer and finer points to be formed on the pins, owing to the facility
of setting the segment and wheel closer to the smaller stone than would be possible
if both stones were the same size. The first stone may be adjusted in front of
the other as shown in plan at Fig. 5, thus enabling one stone to produce the
"set," whilst the other stone is brought to bear on the taper. The short space
between the stones obviates the necessity of rubbing or cutting out a groove to
produce the "set on card or short tapered pins.
"
This machine is equally applicable for grinding, tapering or pointing all kinds of
wires for various purposes.
It is to be understood that I reserve to myself the right to vary the means

page_text: employed for adjusting the stones, which may be variously modified without
departing from the distinctive features of my invention.
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 as my improvements in machinery for pointing or tapering pins, for circle,
gill and card combs and the like is as follows:-
1. The stones C C¹ mounted, driven and adjusted independently of each other,
substantially as and for the purposes set forth.
2. The employment of two stones, the upper surface of which forms one
continuous curve, each stone being mounted on a separate axle, which is adjustable
vertically and horizontally, substantially as and for the purposes set forth.
3. The combination of the axles A A¹, framework B, bearings D D, D' D¹,
horizontal slides E E', adjustable brackets F F¹, screws G G, G G₁, chain
gearing H H', screws J and fly nuts J' substantially as and for the purposes set
forth.
4. The combination of the frame L, shaft N, with keyway, cam P, T piece R,
hand levers S S', screw V, hand wheel W, and frame ✗, substantially as and for
the purposes set forth.
5. The general arrangement, construction and combination of the various parts
forming the machine for pointing or tapering pins for circle, gill, and card combs,
and the like, substantially as herein set forth.
Dated LDIS Toth day of January
BREWER & SON,
London and Leeds, Agents for Applicant.