Improvements in Nailing Machines for Boots.
Year: 1899

page_text: Date of Application, 18th May, 1899
Complete Specification Left, 16th Feb., 1900-Accepted, 14th Apr., 1900
Improvements in Nailing Machines for Boots.
I, WILLIAM HENRY DORMAN, of the Green Hall, Stafford, Engineer, do hereby
declare the nature of this invention to be as follows:-
This invention is intended to be made use of in machines for driving hob nails
into boots and consists in applying to the machine a pricker which makes a
hole in the boot sole for the reception of the nail to ensure the correct placing
and driving of the same.
The pricker stands in front of the hammer bar and after the feed movement
is over which is done by a separate feed foot acting on the head of the nail last
driven and while the hammer bar is raised the pricker is moved in over the
work, down so as to prick a hole, up for withdrawal, and then out again clear
of the hammer. The hammer then descends with the nail and drives the same
into the hole just vacated by the pricker.
The pricker has a pointed lower end and is screw cut above being carried in
The arm
a tapped hole in the split end of an arm and clamped by a set screw.
is secured to the lower end of a vertical shaft and receives a horizontal in and
out movement from a cam and lever above, the cam roll being kept to the cam
by a spring. The vertical shaft is carried in a vertical tubular bearing shaft
which receives an up and down movement, for the purpose of raising and depress-
ing the pricker, from a second cam and lever.
The cams are conveniently mounted on the main shaft of the machine and
the bearing for the vertical tubular shaft, and the pivot for the up and down cam
lever, are carried from the machine head frame.
1000
I, WILLIAM HENRY DORMAN, of the Green Hall, Stafford, Engineer, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed to be particularly described and ascertained in and by the following
statement —
This invention relates to machines for driving hob nails into boots and shoes
and consists in applying to such machines a pricker which makes a hole in the
boot or shoe sole for the reception of the nail to ensure the correct placing and
driving of the same.
According to the invention I construct the pricker of a rod having a pointed
lower end and screw-threaded at its upper part; it is carried in a tapped hole in
The arm is secured
the split end of an arm and clamped therein by a set screw.
to the lower end of a vertical shaft and receives a horizontal in and out movement

page_text: from a cam and lever arranged at the upper part of this shaft. This shaft is
carried in a vertical tubular bearing shaft or sleeve which receives an up and
down movement, for the purpose of raising and depressing the pricker, from a
second cam and lever.
-
The cams are conveniently mounted on the main shaft of the machine, and the
bearing for the vertical tubular shaft and the pivot for-the up and down cam lever
are carried from the machine head frame..
The pricker is arranged in front of the hammer bar and in proximity to the
feeding foot which latter feeds along, the work by acting against the side of the
head of the nail last driven. Whilst the haminer bar is raised the pricker is
moved in under the hammer, depressed so as to prick a hole, withdrawn and
then moved out again clear of the hammer. The hammer then descends with
the nail and drives the same into the hole just vacated by the pricker.
In the accompanying drawings I have shewn my improvements applied to a
hob nailing machine of the kind' described in the Specifications of my 'prior
Patents Nos. 23363 of 1895 and 19654 of 1898.
'
In the said drawings:-
1.1
Figure 1 is a front view of a portion of the machine having the improvements
applied to it.
Figure 2 is a side view thereof.
Figure 3 is a side view with some of the paris removed to more clearly shew
the pricker parts.
Figure 4 is a plan view with the cam and hammer bar removed.
Figures 5 and 6 are a sectional elevation and plan view illustrating the pricker
and method of mounting the same; and
Figures 7 and 8 are a front elevation and a plan respectively of the cams for
operating the pricker.
a is the main frame of the machine and the main shaft thereof, the said
shaft having mounted upon it the various cams which operate the different parts of
the machine; bis the hammer bar which drives the nail into the boot sole and b¹ is
the cam for operating the same; - is the foot which feeds forward the work by
its action upon the side of the head of the last nail driven into the boot sole, the
said foot being mounted upon the lower end of the lever c' which is operated by
a cam groove hereinafter described.
dis my pricker, the said pricker being as above mentioned pointed at its
working or lower end and provided with a screw thread upon its upper end
and is the arm into the free end of which the screw-threaded end of the
pricker is inserted; the end of the arm e in which the pricker is held is split as
shewn clearly at e¹, Figure 6, and is closed upon the pricker d by means of a
clamping screw c² which tightens the split end upon the screw-threaded end of
the pricker. By securing the pricker in this manner to the lever the former is
rigidly held in the lever and can also be adjusted with facility. f is the vertical
shaft to the lower end of which the other end of the lever e is secured and fis
the tubular vertical shaft or sleeve in which the said shaft f is rotatably mounted,
the said sleeve being carried in the socket 9 forming part of the main frame a.
The shaft is provided at its upper end with a cam lever f² carrying at its free
end a cam roll f3 which is operated by the face of the cam h mounted upon the
main shaft a¹ of the machine; this cam, which is shewn more clearly in Figures 7
and 8, has for its object to move the pricker horizontally, that is to say, from the
position shewn in the full lines in Figure 3 to that shewn in dotted lines and
back again as hereinafter more particularly described; it is also formed with a
groove h² for operating the foot c. f is a spring for maintaining the cam roll f
in contact with the cam surface h. This spring bears at one end against the
peg f secured to the sleeve fl and at the other end against the peg f fixed in
the collar keyed upon the vertical shaft f by means of the set screw h; by
adjusting the position of this collar 3 upon the shaft f the tension of the
spring can be regulated.

page_text: The up and down movement is imparted to the sleeve f¹ and the pricker d by
means of the periphery of the cam h which acts upon a roll i carried on a lever i¹.
This lever is mounted on a pivot in the frame and is connected to the
sleeve f¹ by trunnion blocks which are free to turn in the forked end of the
lever and to slide in grooves j provided in the sleeve. The pricker d is moved
down from the upper dotted position to the lower dotted position shewn in
Figure 3 by the cam h and the roll i which is kept in contact with the cam by
the spring which also raises the pricker, being connected to the sleeve f¹ and
to the socket g.
The pricker operates in the following manner. The hammer 6 having descended
and driven a nail, is raised by the cam b¹ in the manner described in my afore-
said patents and the feed foot c is operated by the cam groove h² so as to feed
forward the work, operating on the head of the nail last driven into the boot
sole. As soon as the foot c has finished is work and the hammer b is sufficiently
raised, the pricker d is moved in by the operation of the cam face h¹ from the
postion shewn in full lines to the upper position shewn in dotted lines Figure 3
vertically under the raised hammer point. It is then thrust vertically downwards
by the cam from the upper dotted position to the lower dotted position so as
to pierce the work, after which it is raised again and moved outwards to the
position shewn in full lines so as to be out of the way of the hammer b which
immediately afterwards descends with the next nail and drives it into the hole
just vacated by the pricker.
The carrier, which is preferably of the kind described in my above mentioned
patents, supplies the nails to the hammer when in its raised position and the
hammer point is magnetized so as to attract a nail and hold it during its descent
to the work.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what
I claim is:
1. In a machine for driving nails into the soles of boots and shoes, the em-
ployment of a pricker having a pointed lower end and a screw-threaded upper
end, the latter being secured in the split internally screw-threaded end of a lever
by means of a clamping screw, substantially as, and for the purpose, herein before
described and as illustrated.
2. In a machine for driving nails into the soles of boots and shoes, the employ-
ment of a pricker held in an arm secured to a vertical shaft carried in a vertical
sleeve and of cam and lever mechanism for imparting horizontal and vertical
movements to the pricker, substantially as hereinbefore described.
3. In a machine for driving nails into the soles of boots and shoes the use of a
pricker comprising a rod pointed at its lower end and screw-threaded at its upper
end, the screw-threaded upper end being clamped in the split end of a lever
secured to an upright rocking shaft carried in a vertical sleeve, the said sleeve
being adapted to be moved up and down by a cam and lever and the upright shaft
to be turned to and fro on its axis by a cam and lever, substantially as herein-
before described and illustrated.
4. The combination with a machine for driving nails into the soles of boots
and shoes of the pricker and the mechanism for operating the same, hereinbefore
described and illustrated in the accompanying drawings.
Dated this 16th day of February 1900.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.