Improvements in Machinery for Inserting Screw-threaded Wire into Leather or other Material.
Year: 1892

page_text: COMPLETE SPECIFICATION.
Improvements in Machinery for Inserting Screw-threaded Wire into
Leather or other Material.
A communication from abroad by JAMES WILLSON BROOKS, of 108, Summer
Street, Boston, in the County of Suffolk and State of Massachusetts, U.S.A.,
.Gentleman.
I, Alfred GeoRGE BROOKES of 55 & 56 Chancery Lane in the County of
London, Chartered Patent Agent, 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 :-
This invention has for its object to improve that class of machine represented in
British Patent No. 920 dated March 3, 1876.
The machine described in said Patent has a spindle which receives a single-
threaded wire which is fed out through the nose at the end of the said spindle by
gripping and feeding rolls, and the wire is inserted into the stock resting on a
suitable horn or support, the wire while being inserted, being rotated so that the
threads thereon are screwed into the stock.
The wire having been inserted into the sole, is cut off flush with the sole, leaving
a fastening therein.
In the machine referred to the spindle is rotated continuously, and the gripping
and feeding rolls carried by the spindle at the lower end thereof, have imparted
to them an intermitting movement in the direction to feed the wire from the
nose at the end of the spindle, they being moved once during each rotation of the
cam-shaft.
The gripping and feeding rolls referred to derive their intermitting movements
from a cam-shaft, driven from a worm on the spindle referred to.
In the machine described the spindle is, mounted in bearings in a head, and the
weight of the wire added to the weight of the head and its parts results in very
considerable strain being put upon the machine when the head has its rising and
falling and also its lateral vibrating movements, as when the shoe is being fed, and
because of its weight it has been found impracticable to rotate the spindle above a
certain speed, and do good work.
Owing, however, to the great competition in the manufacture of shoes, it became
a great, desideratum to increase the effective speed of operation of the machine
referred to, as such increase of effectiveness lessens the cost of production of boots
and shoes thereon.
In attempts to solve this problem and increase the effectiveness of the particular
machine under. consideration, it was found that the speed of the spindle could not
safely be increased, but rather ought to be reduced; but after considerablé
experiment it was discovered that the cam-shaft actuated by the spindle might be
made to rotate at a faster speed and to effect this faster speed of the cam shaft the
said spindle which drives the cam shaft has been provided with a double worm and
the teeth of the worm-gear on the cam-shaft have been so altered as to cooperate
with the double worm to secure double or more than double the speed of the cam
shaft. This, cam shaft by reason of its greatly increased speed of rotation acts
through its cams to actuate the gripping and feeding rolls and "the wire cutting
and head lifting and head vibrating or feeding devices at more than double the
speed at which the similar devices are actuated in the Patent referred to, the speed
of the rotation of the spindle, however, remaining the same.
"This change has made it possible to reduce somewhat the speed of the rotation
of the spindle which carries the coil of wire, and yet' by reason of the greatly

page_text: increased speed of the cam shaft actuated by the spindle through its double worm
to nearly double the amount of work which may be done upon the machine.
The cam shaft now having more than double the speed it formerly had, tends to
feed the wire more than twice as fast as before, while the speed of rotation of the
spindle which screws the wire into the sole remains the same. To compensate for
this difference in relative speeds a double threaded wire such as represented in the
Specification of Letters Patent No. 12727 dated the 20th September 1887 is
employed, the double thread having a steeper pitch than the single thread formerly
used and permits the wire to be fed at the increased speed for the same rotation
speed of the spindle.
Fig. 1, in side elevation represents a sufficient portion of a machine embodying
this invention to enable the same to be understood.
Fig. 2, is a front elevation of the parts shewn in Fig. 1.
Fig. 3 is a left hand side elevation of the parts shewn in Fig. 1 but with the
spindle rotated about 90° from its position shewn in Fig. 1.
Fig. 4 is an enlarged detail shewing the wire-carrying spindle with its attached
wire-feeding devices, the double worn and the worm gear supposed to be upon the
cam-shaft.
Fig. 5, shews the worm gear developed or laid out flat; and
Fig. 6 is a longitudinal section of the spindle and its parts, the worm being
omitted, the scale being the same as in Figs. 1 and 3.
The standard C, the spindle D through which the threaded wire to be used is
fed, it being taken from a suitable spool F, the pulley F2, fast on the said spindle
and rotated by a suitable belt driven by a suitable pulley, not shewn, the enlarge-
ment I at the lower end of the spindle; the feed rolls H; the toothed slide J, see
Fig. 6; the threaded sleeve e connected to the upper end of it and provided with a
loose collar; the gearf having a groove equal to one-half of the diameter of the
wire, the said groove being opposite a groove in the slide J; the sleeve g upon
which the gear is mounted; the pawl i carried by the said sleeve; the ratchet
wheel actuated by the said pawl, the said ratchet wheel being mounted upon a
shaft provided at its opposite end with a pinion, which engages an intermediate
gear, which in turn engages a pinion' fast on one end of one of the gripping and
feeding rolls H, having worm-like teeth to engage the threads of the wire; the
bearing plate H2 containing the bearings for that one of the grip and feed rolls
which is not rotated positively by the gearing described; the bar m connected to
the loose collar e²; three-armed lever K, having at one end a roller or other stud;
the rod n resting on the stop o; the spring p; and sleeve nut 7; the wire severing
there being in practice two such cutters; set screw ; the head E in
which the spindle D has its bearings, and which also has bearings for the cam-
shaft S; the arms t, one for each member of the cutter; the nose D³; the lever M,
instrumental in actuating the arms t carrying the cutters to cut the wire off close
to the surface of the sole; the vertical rod or pin N, shewn by dotted lines in
Fig. 3; the hollow post N°; the arm N3 projecting from the post N and provided
with a roller or other stud; the hollow sleeve B; the vertical rod U; the lever V
to which the upper end of the said rod is adjustably connected, said lever at its
inner end having a roller or other stud; the cam L to actuate the lever K, said
cam having a depression 2, see Fig. 3, and a projection w, see Fig. 1; the cam V³
to actuate the lever V; the cam O. to actuate the rock-shaft N to swing the
head E laterally to effect the feeding movement of the shoe being nailed, are and
may be all as in the said Patent No. 920, where the like parts are designated
by like letters, with the exception of the letter S which is used to designate the
cam-shaft.
cutters
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In accordance with this invention the spindle D has been provided with a
worm A, having two threads a, a', and the cam shaft S has been provided with a
worm gear R2, having its worm teeth sloped and adapted to receive the double
threads of the worm, so that the said worm carried by the spindle rotates the
shaft S.