provements in Machinery and Appliances for Screwing Soles to Boots.
Year: 1888

page_text: Date of Application, 29th June, 1888
Complete Specification Left, 29th Mar., 1889-Accepted, 29th June, 1889
PROVISIONAL SPECIFICATION
Improvements in Machinery and Appliances for Screwing Soles
to Boots.
I, WILLIAM HENRY DORMAN of The Hawthorns, Newport Road, Stafford in the
county of Stafford, Engineer, do hereby declare the nature of this Invention to
be as follows :-
My invention consists of improvements on that Machine in general use among Shoe
Manufacturers, known as the Standard Screw Machine, and on the continuous screwed
wire which is used in it.
The Standard Screw Machine is at present driven as fast as it is mechanically
practicable, but it is very desirable in order to reduce the cost of working with this
Machine, to materially augment the quantity of work that can be done by it, in a given time.
In order to accomplish this, and without increasing the speed at which the Machine is
driven, I use a screwed wire in which the contiguous threads are no greater distance
apart than in the present wire, but which being double threaded, will advance into a
substance twice the distance for a given number of turns than the wire in present use
will. I also make the tangent screw on the Machine spindle double threaded, and the
worm wheel on the cam shaft into which it works, adapted thereto, but with the same
number of teeth as at present, the object in view being that the cams shall revolve twice
as fast in relation to the spindle as in the present Machine, so that the same length of
wire shall be fed down in half the number of revolutions of the spindle, and twice the
number of screws be inserted in a given time.
The Machine as at present made is very liable to heat-to avoid this I construct the
top bearing of the machine spindle in such a manner that the oil enters by the spindle,
and is carried out between & over the bearing surfaces by the centrifugal force
generated by the swift rotation of the spindle-1 also construct the top-bearing, so that
a much wider wearing surface is obtained.
Much difficulty is met with, from time to time in connection with the working of
the Machine through the want of means for adjusting the jaws that carry the
wire cutting knives centrally with the wire, so as at all times to ensure an exact and
equal cut off. I arrange bearings on either side of the said jaws taking against their
wearing surfaces capable of adjustment, so as to enable the said jaws to be exactly &
centrically adjusted to the axis of the wire.
COMPLETE SPECIFICATION.
Improvements in Machinery and Appliances for Screwing Soles
to Boots.
I, WILLIAM HENRY DORMAN, of The Hawthorns, Newport Road, Stafford, in the
County of Stafford, 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 :-
My invention consists of improvements in automatic machines for attaching soles to boots
with screws automatically cut off at the desired lengths from a continuous screwed wire
and especially applicable to the machine generally known as the Standard Screw Machine
and described in letters patent No. 920. 3rd March 1876. Machines of this kind
require to be driven at a very high speed in order to work perfectly and to enable a
sufficient quantity of work to be produced.
For well understood mechanical reasons, it is very undesirable to increase the running

page_text: speed of the machine and at the same time it is an object of importance to increase the
quantity of work capable of being done in a given time.
In order to accomplish this object I make use of a continuous screwed wire which
is made with a double thread so that the screwed wire will advance into the sole of the
boot twice the distance as compared with the ordinary single threaded screwed wire
for a given number of revolutions yet the distance of the threads apart not being
increased the friction and consequent holding power of the screw in the leather is
not diminished.
I make the tangent screw on the machine spindle double threaded and the worm
wheel on the cam shaft into which it works adapted thereto, but with the same number
of teeth as at present the object in view being that the cam shall revolve twice as
fast in relation to the spindle as in the machine as at present constructed, so that
the same length of wire shall be fed down in half the number of revolutions of the
spindle and twice the number of screws he inserted in a given time.
Much difficulty is met with from time to time in connection with the working of
the machine through the want of means for adjusting the jaws that carry the
wire cutting knives centrally with the wire so as at all times to insure an exact and
equal cut-off.
I arrange hearings on either side of the said jaws taking against their wearing surfaces
capable of adjustment so as to enable the said jaws to be exactly & centrically adjusted
to the axis of the wire.
DESCRIPTION OF THE DRAWINGS.
The accompanying drawings show those parts of the Standard Screw Machine to
which my improvements are applied.
Fig. 1. is a front elovation of the machine head showing the main spindle through
which the wire passes, the tangent screw and the worm wheel.
Fig. 2. is a view of the underside of the head shewing the adjustment for the jaws
which carry the knives for cutting off the wire.
Fig. 3. is a side elevation of the same.
The same letters refer to the same parts.
A Fig. 1. is the machine head having bearings B. B. in which the main spindle “(!”
revolves.
Upon the spindle "("" is secured the tangent screw or worm D) which is double
threaded. E is the cam shaft on which are carried the cams that determine the length
of the screws & regulate the various functions of the machine. On the shaft E is
mounted the worm wheel F. which is adapted to and caused to revolve by the
worm D.
The grooves d. that embrace the wire a. in the feeding rolls "C" are cut with recessos
formed to fit the double threaded wire "e."
A. Figs. 2 & 3. is that portion of the machine head in which are carried the
jaws S. & T. upon which are mounted the wire cutting-off knives.ƒ. The jaws S. & T.
are actuated by the pinion U. & have the ring V. all in the usual manner.
I arrange pieces W. W. held by the screws X. upon the sides of the head A. and
having bearing pieces Y. held by the screws Z. at their outer ends.
The bearing pieces Y. Y. bear partly upon the jaws S. & T. & partly upon the ring V.
By easing the pieces W. W. in the event of the jaws S. & T. requiring to be adjusted
centrically to the wire, with a file or otherwise at the points w. w. as required & setting
up the screws X. The jaws & with them the wire-cutting-off knives f. f. may be sot
centrally with the wire e.
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:
First In an automatic machine for attaching the soles to boots with screws auto-
matically cut off at the desired lengths from a continuous screwed wire the use of a
continuous screwed wire with a double thread.