Improvements in Nailing Machines Employed in the Manufacture of Boots and Shoes.
Year: 1894

page_text: Date of Application, 30th Aug., 1894-Accepted, 1st June, 1895
COMPLETE SPECIFICATION.
Improvements in Nailing Machines Employed in the Manufacture of
Boots and Shoes.
We THE UNION BOOT AND SHOE MACHINE CO. LIMITED, Bowling Green
Street, Leicester, do hereby declare the nature of this invention (a communication
to us from abroad by Frank D. Locke of Hudson, in the County of Middlesex,
Massachusetts, U.S.A.) and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement :-
This invention hereinafter set forth is an improvement in nailing machines for
boots and shoes.
It relates to that class of machines in which the nails are formed out of a
continuous wire, pointed and severed from the wire, and driven into the sole of a
boot or shoe.
It consists in improved details of construction, a part of which are included in
the cutting machinery which is constructed and arranged to form an improved
shape of nail: for the easy and accurate adjustment of the cutters and their firm
clamping to the jaws, and for simplicity and strength..
The invention also includes improved devices for operating the jaws.
It includes also improved mechanism for transferring the nails from the cutting
and forming mechanism to the driving mechanism and for moving the boot or shoe
automatically as the nails are driven.
The said invention is illustrated in the accompanying drawings in which
Figure 1 shews in elevation, the front of the machine, Figure 2 represents a rear
elevation. Figure 3 shows a view of a detail. Figure 4 is a sectional view
through one of the cutters and part of its lever showing the pivot thereof.
Figure 5 is a sectional view taken longitudinally through the carrier showing
the vertical opening therein, for the portion of the wire cut off, the feed rollers,
being shown in transverse section with their gears showing beyond and the cutters
and plunger are shown in this view also together with the carrier lever in dotted
lines.
In the drawings, A represents the head which carries the various mechanisms
herein referred to. In this head is a reciprocating plunger a which carries the
driver 1, arranged to bear directly upon the heads of the nails.
This plunger is provided with a spring 2, by means of which the force of the
blow is supplied. The plunger is raised by means of a cam 3 on a shaft m which
is preferably the main shaft of the machine and is driven by any suitable means.
The cam 3 bears in lifting upon an anti-friction roller on a pin set in the
plunger, and is constructed and arranged to release the plunger as soon as the nail
is in place underneath the driver. On the main shaft m is also an eccentric
strapped to a lever 4 which carries the feed foot 5 set so as to bear upon the boot
or shoe when in place on the jack, and to feed the said boot or shoe step by step as
the nails are driven. The pivot 6 of the lever 4, is vertically adjustable on the
head and in the lever, so as to vary the throw, and the action of the foot is like
that of an ordinary sewing machine. The cutters 7 and 8 are arranged upon the
ends of horizoutal levers L pivotted on the head and forming a pair of jaws.
Their forward ends are rabbetted as shown in Figure 3, and the rabbetted part is
grooved as shown at 10.
The cutters have a tongue 11 which fits in the groove snugly and holds them
firmly and accurately in place.

page_text: The cutters are slotted horizontally and are held to their seat by means of a
binding screw 12 which passes through the slot.
In the back end of each cutter is a screw 13 having a kerf on its outer end for
adjustment and this screw bears against the back of the rabbet marked 14.
By turning the screw out, wear or the grinding of the cutters may be
compensated for as the screw bears against the part 14. In adjusting after
grinding the screw is turned out, the cutter gauged and put in place.
The longer ends of the cutter levers are provided with anti-friction rollers 15,
which bear on a separating wedge w, arranged to vertically reciprocate in guides
on the rear of the heads and force apart the rear ends of the levers, thus very
forcibly closing the jaws and severing the wire.
This wedge is operated intermittingly by means of a pin in its head, carrying
a roller which works in a cam groove of a wheel R on the shaft d. The shaft d
has also thercon a spur wheel which gears with a similar wheel (neither of which
wheels is shown in the drawings) on the shatt m and is driven thereby. The
wheel R is set and the groove formed so as to give a quick movement, and close
the jaw as soon as the wire is down in place and then to release and permit the
opening.
The shape of the cutting ends is as shown in Figure 1.
The edge
on the lower side and the bevel corresponds to that required of the
point of the nail.
The cutters are arranged edge to edge, and are at one side and preferably about
one and a quarter inches from the driver. They rest upon the carrier n. and
between it and the lower face or shoulder of the head.
The levers are drawn together and the jaws opened by a spring t.
The wire is fed down from any suitable reel, under tension, and is drawn by
rollers 16 and 17.
One of these 17 is pivotted on the head and the other and larger is carried on a
lever 18 pivotted on the head at f and provided with a straining screw 19 by
means of which the proper pressure is put upon the wire.
The wheels are provided with teeth cut transversely on their peripheries, which
teeth take hold of the wire and also serrate it upon opposite sides.
These wheels are both connected by gearing and both are driven positively.
The wire passes from them directly to the cutters. The mechanism for driving
the feed wheels for the wire is arranged to cause them to move intermittingly and
immediately after the return of the carrier.
On
On the shaft of the feed wheel 16 is a ratchet wheel 25 worked by pawls and a
lever 26 which is connected to an arm 27 slotted and sliding on the shaft m.
this shaft is a cam 28 which works the lever one way while a spring 29 moves it
the other way. This spring 29 bears against a pivot pin 30 mounted in the
arm 27 and upon this pivot pin upon the opposite side of the arm 27 is mounted an
eccentric disk or roller 31 against which the eccentric 28 bears and the throw of
the arm 27 may thus be varied by rotating the roller 31 to any desired extent.
This may be accomplished by any desired means which need not be specified
here.
The carrier n is a block of steel arranged to reciprocate in a guideway and in
contact on its upper face with the cutter. It contains a cavity or hole made
vertically through it for the nail. When it is back, the hole is directly under the
jaws and when forward directly under the driver. It reciprocates about one
and one-fourth inches. It is moved by an arm 20 on one end of the shaft e
which has its bearings in the head. The other end of the shaft projects
through the head and has fixed thereto an arm 6 connected by a link
with a lever p of the third order and adjustably pivotted at its upper end
by means of a movable bearing in a slot and set screw 21 controlling the said
block. A cam 22 on the shaft d throws intermittingly the lever p by action
on roller 24 on stud in the lever. The reverse movement is caused by a
spring 24*. The action is timed to shift one way just before the action of the

page_text: driver and the other just before the feed of the wire, and this is caused by the
shape and set of the cam, the high and low parts of which are long enough to
hold the carrier at each end. The adjustment of the lever p is for the purpose of
getting the accurate adjustment of the carrier. The nails formed from the square
wire are grooved as will be readily understood by the pressure from the corrugated
feed rollers on opposite sides, but I have not deemed it necessary to illustrate
these corrugations in the present drawings. The bevels are also formed on the
same sides since the bevels of the cutters are at right angles to the plane of the
grooved cutter wheels. The object of this is to provide a point which can be
more favorably upset and also to cause the compression of the leather caused by
the nail, to fall on the grooved sides of the nail. The nail point is upset as usual
by striking the steel plate and it spreads in line with the edge or over the smooth
sides of the nail and the spread is greater in these directions for the reason that it
is prevented by the bevels in the other directions. This gives a more secure hold
upon the leather.
Having now particularly described and ascertained the nature of our said inven-
tion as communicated to us by our foreign correspondent, and in what manner the
same is to be performed we declare that what we claim is :-
1. In a nailing machine the combination with the cutter levers having rabbetted
and grooved ends, of the slotted cutters carried by the said rabbetted ends,
adjusting screws located in the rear ends of the cutters and binding screws passing
through the slots for securing the cutters in place substantially as described.
2. In a nailing machine the combination with the reciprocating carrier, of the
rock shaft e having an arın pivotally connected to the said carrier, an
arm 6 also
carried by the said rock shaft, an adjustable lever p having a link connection with
the said arm b, and a cam for operating the said lever substantially as described.
3. The improvements in nailing machines substantially as described and
illustrated in the accompanying drawings.
Dated this 29th day of August 1894.
W. P. THOMPSON & BOULT,
Agents for the Applicants.