Improvements in Nailing Machines, chiefly designed for use in the Manufacture of Boots and Shoes.
Year: 1897

page_text: Date of Application, 15th June, 1897-Accepted, 4th Sept.,
1897
COMPLETE SPECIFICATION.
Improvements in Nailing Machines, chiefly designed for use in the
Manufacture of Boots and Shoes.
I, WILLIAM GODDU, of Winchester, Massachusetts, United States of America,
Mechanic, 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 relates to nailing machines, and is herein shown as embodied
in a machine especially designed and adapted for use in the manufacture of boots
and shoes, and of the character commonly known as a string nail tacker.
The machine referred to, is provided with a carrier for a plurality of strings of
nails, which carrier is movable bodily with relation to a nose piece, so as to bring
a selected string of nails into proper working position with relation to the said nose,
and in accordance with this invention, the movement of the string nail carrier, is
placed under control of the foot of the operator, and, for the best results, the said
carrier is operatively connected as will be described, to the treadle, which operates
the clutch or starting mechanism of the machine, whereby the operation of the
machine and the positioning of the string nail carrier, may be effected by one lever
or treadle.
The invention further has for its object to improve and simplify the construction
of the machine as will be described, whereby a more efficient and rapid machine
may be obtained.
Another feature of this invention consists in providing the machine with a novel
construction of work-support and with a novel feed mechanism for the work,
which feed mechanism is especially applicable for feeding the rands, when the
machine is employed for tacking rands to the sole of a boot or shoe.
These and other features of this invention will be pointed out in the claim at
the end of this specification.
Fig. 1 is a side elevation of a sufficient portion of a nailing machine embodying
this invention, to enable it to be understood.
Fig. 2, a detail in section to be referred to.
Fig. 3, a side elevation of the base or lower portion of the machine shown in
Fig. 1 with parts broken away.
to.
Fig. 4, a sectional detail of the treadle mechanism preferred by me.
Fig. 5, a front elevation of the machine shown in Fig. 1.
Figs. 6 and 7, details in front elevatio nto be referred to.
Fig. 8, a detail in side elevation to be referred to.
Figs. 9 and 10, details in front elevation and on an enlarged scale, to be referred
Referring to the drawings, A represents an open framework or head of the
machine, which is secured as by screws A to a hollow upright or standard A³
attached to a hollow base A3, provided, as shown, with supporting legs A. The
head A supports in suitable bearings a main shaft a, which is preferably made of
substantially large diameter to enable it to be turned down in parts to form cams
integral with the said shaft. The main shaft a is provided at its

page_text: front end with a lifting cam a¹ of a construction common to machines
of this class, which lifts a driver bar a provided with a block a³ reciprocating in
a guideway a in a cap or front piece attached to the head A.
The driver bar a² has secured to its lower end à driver a movable in a suitable
opening or passageway not shown, in a guide block or piece a', detachably secured
to the head A as by screws as, the driver guide a being secured to the head A
so that its passageway is in line with a passageway a in a nose a attached as by
screw 120 to the head A. (see Fig. 1).
The driver guide a is stationary on the head and is extended toward the nose
to afford a long bearing for the driver, and the said guide has co-operating with it
and the nose ao, a movable multiple string nail carrier a¹² secured as by screws a¹³
to a crank or arm a on a rock-shaft a5 having bearings in the lower portion of
the head A, the rear end of the rock-shaft having gear teeth a¹6 (see Figs. 1 and 8),
which are engaged by a gear or pinion a fast on a rock-shaft a18 extended down
through the hollow upright A² and base A3 and operatively connected to a treadle
or lever 20, so as to be rotated or turned thereby as will be described.
The treadle or lever a20, in the present instance, is provided with a hub a loosely
mounted on a pivot pin or rod 22, to move in a vertical plane, and the pivot a
for the said treadle is itself rotatable in a plane substantially at right angles
thereto, namely, in a substantially horizontal plane, and, in the present instance,
the Livot pin or rod 22 is provided with forked arms a, a, which embrace an arm
or bar 26 extended from one of the legs A' and to which bar or arm, the forked
arms are pivotally connected as by the pin 500 (see Fig. 4), to swing or
inove in a substantially horizontal plane.
18
The arm a forms a bearing or support for the lower end of the rock-shaft a¹8,
which is provided above the arm a26, as herein shown, with a collar a secured to
the shaft as by set screw a31 and below the arm 26 the rock-shaft a 18 has fast on
it a segmental gear 2, with which meshes a toothed segment on the arm 2
of the treadle or lever a20, so that movement of the treadle 20 in a substantially
horizontal plane with the pivot or pin 500 as a centre, will produce a rotary
movement of the shaft a¹8, which rotary movement effects a longitudinal movement
of the shaft a¹s by means of the gear a and gear teeth 16. The toothed
segment a on the arm 2 of the treadle or lever a20 meshes with the segmental
gear somewhat loosely (see Fig. 4), so as to permit of the movement of the
arm 2 of the treadle a20 in a vertical plane without effecting any movement of the
rock-shaft a 18.
The movement of the arm 2 of the treadle a20 in a vertical plane, is designed to
effect the starting of the machine in operation, and, to this end, the arm 2 of the
treadle is extended beyond the toothed segment a, and has connected to it
the lower end of a link a extended up through the hollow upright A2, and having
its upper end connected to one member a³ of a clutch mechanism, which member
is provided with a bevel face 3, which co-operates with a correspondingly beveled
face 4 on the other member a37 of the said clutch mechanism. The members a36, 37
of the clutch as herein represented, embrace the reduced portion of the shaft a,
and control the engagement of a loose pulley a with a disk a40 fast on the reduced
portion of the shaft a. The upward movement of the link or rod a³, effected by
a movement of the arm 2 of the lever or treadle a20 in a vertical direction, causes
the beveled face of the member as to travel up the beveled face 4 of the
member 237 of the clutch, and thereby forces the loose pulley a39 into engagement
with the disk a40, and when the treadle a² is released by the foot of the operator,
the movable member a of the clutch is lowered by means of a spring-actuated
brake-lever a, pivoted as at a in a slot in the head A, and having its rear end
acted upon by a spring 50 (see Fig. 1), the front end of the lever at being provided
with a brake-shoe a3 adapted to engage a grooved brake-wheel or disk a", fast on
the main shaft a and represented as integral with the disk a40. The brake-
lever a also has mounted upon it a roller a50 adapted to ride upon the periphery
of the disk at, the latter having a portion of its circumference cut away to form

page_text: a recess a³ into which the roller a enters, so as to permit the brake-shoe a¹³ to
engage the brake-wheel a", the brake-shoe a being disengaged from the brake-
wheel a when the full periphery of the disk is passed under the roller a50.
The brake-lever a is positively engaged with the movable member a³ of the
clutch mechanism by a rod a53 (see Fig. 2), having at its opposite ends right and
left hand screw-threads, one of the screw-threads, has the right hand screw-thread,
engaging a threaded socket in the member a36 and being secured therein by a
nut, and the other or left hand screw-threaded end of the rod a engaging a
thumb nut a, provided with a screw-threaded extension or hub a, which engages
a screw-threaded socket a in the brake-lever a, the screw-threaded extension a53
forming on the nut a, a shoulder a60 (see Fig. 2), which abuts against the lever a".
By means of the construction just described, the clutch member a is positively
and adjustably connected with the brake-lever a", so that by means of the
adjusting nuta, the clutch member may have its bevel face 3 adjusted with
relation to the bevel face 4 of the co-operating member a, and the positive
connection referred to, effects a positive downward movement of the member a³,
when the brake-shoe 3 is engaged with its brake-wheel a to stop the machine.
Furthermore, the connection referred to, permits the operator to release the
brake-shoe 3 from engagement with the brake-wheel so as to enable the main
shaft to be turned by hand, which is desirable in adjusting or timing the machine,
without disturbing the adjustment of the clutch member with relation to the
clutch member a. By reference to Figs. 1 and 2, it will be seen that when the
machine is at rest, the nut as may be turned so as to carry upward the lever al
and thus remove the brake-shoe from the brake-wheel ", which releases the
shaft and permits it to be rotated by hand if so desired.
It will further be noticed that the screw-threads on the rod a are fine as
compared with the screw-threads on the hub a55, so that the nut 4 may travel
upen the screw-threaded rod as a considerable distance without disengaging the
mt from the lever a, and, therefore, the brake-shoe may be disengaged from its
brake-wheel without disengagement of the nut a from the brake-lever. Further-
more, it will be seen that when the nut as is turned in the reverse direction, the
shoulder will abut against the lever at at or about the time the brake-shoe
engages the brake-wheel, and that the adjustment of the clutch member as with
relation to the clutch member a37 is not disturbed.
From the above description, it will be seen that the starting and stopping of
the machine is under the control of the foot of the operator through the treadle a²º,
and the positioning of the movable string nail carrier a 12 with relation to the
driver a and the nose piece a¹0 is also under the control of the foot of the operator
through the same treadle or lever a20, which construction leaves both hands of the
operator free to attend to his work.
The string nail carrier a 12 normally occupies a position out of line with the
passage in the nose a¹0, and the shaft a¹ is adapted to be rocked so as to place the
selected string nail on the carrier into position to be fed into the nose, and then to
be moved still further in the same direction to permit the nail inserted into the
passage in the nose a¹0 to be severed from the selected string nail.
These successive movements of the carrier a2 are effected, as herein shown, by
means of a cam b on the shaft a operating upon a roller 61 carried by a crank or
arm 2 fast on the rock-shaft a¹5, the cam 6 being properly shaped and timed so as
The carrier a¹ in the
to effect the progressive movements of the carrier a
b
present instance, is shown as provided with two passages 63 64 (see Figs. 1 and 8)
ino which the string nails 65 66 (see Fig. 5) are inserted, the said string nails being
in practice wound upon suitable reels B B (see Fig. 5). Each of the string nails
referred to, consists as herein shown, of a series of connected headed and pointed
tapering nails, and the nails comprising the two string nails are designed in
practice to be of unequal length, so that different lengths of nails may be driven
from the same machine. The carrier al has co-operating with it a combined
feeding and cutting mechanism, consisting essentially of a knife or blade 68,

page_text: secured to the lower end of an arm 69 constituting a cutter carrier, and which is
Divcted as at 610 to a crank or arm 12 on a rock-shaft 613, having bearings in the
head A and provided at its opposite end with a crank or arm 61 carrying a roller 615,
The rock-shaft 613
which is acted upon by a cam 616 forming part of the shaft a.
is also provided wth a crank or arm 67 represented as integral with the crank or
arm 12 and as carrying an adjustable stop or screw 6180, which is adapted to make
contact with the head A of the machine as will be described. The crank 614 on
the rock-shaft 613 has its roller 615 kept in engagement with its co-operating
cam 616, as herein shown (see Figs. 1 and 8) by means of a suitable spring 618
having one end fastened as at 619 to the frame of the machine, and its other end 1
bearing against 'a pin 620 on the arm 64; and the crank or arm 62 on the shaft a¹5
has its roller 1 kept in engagement with the cam b by a spring 621, fastened to
the frame as at 622 and engaging a pin 623 on the said arm. The cutter carrier 69
has secured to it one end of a spring 624, having its other end fastened to a pin or
hook 25 extended from the crank or arm 612, the said spring acting to keep the 1
knife or blade 68 in engagement with the carrier a¹³.
The string nail carrier, as herein shown, is provided with an offset lower
portion 5, and the stationary driver guide a has its lower end cut away or recessed,
as at 6, so as to permit the offset portion 5 of the string nail carrier to move beyond
the line of the passage a³ in the nose a¹0, when the knife 68 is moved across the
horizontal upper surface of the nose, to sever the nail in the nose from the string
nail.
The carrier 2 has detachably secured to it as by a screw 630, a yielding cover or
guard 6 for the string nails, having a bent end or finger 6%, which is adapted
to engage the heads of the nails and prevent backward and upward movement of
the string nails. The driver bar a², which is lifted by the cam a¹ is moved in an
opposite direction by the spring 640. The reels B B¹ upon which the string nails
are coiled are removably secured to an upright standard or arm 644 secured to or
forming part of the head A, and each of the said reels as herein shown, comprises
a rim or periphery 650, provided with a side plate bal secured to it and a detachable
spider 602 which constitutes the other side plate for the rim.
The side plates 651 of the reels B B¹ have co-operating with them suitable friction
shoes 653, pivoted as at 654 to an arm or extension 655 of the upright 64 these shoes
serving to control the motion of the reels B, B¹.
The operation of the machine, as thus far described, may be briefly set forth
as follows:
As represented in Figs. 1 and 5, the multiple carrier a¹2 is in what may be
termed its normal position with its slot or passageway 63 in position to be moved
toward and into line with the passage in the nose a¹0. When in this position, the
lever or foot treadle 20 occupies the position represented in Fig. 4, with a projec-
tion 660 on the heel plate 661 of said lever, engaging a slot 662 in the gage plate or
block 3 fastened to the floor or other support.
If now, it is desired to drive nails from the string 65, which is supposed to be
located in the passageway 63 of the carrier a¹, the operator depresses the heel
plate 661 and thereby turns the lever or treadle a20 on its pivot a, which movement
of the lever elevates the rod a35, the clutch member a and the brake-lever a
The elevation of the parts referred to, releases the brake-shoe from engagement
with the brake-wheel or disk at, and engages the loose pulley a with the disk a¹0,
thereby starting the machine in operation.
During the operation of the machine, the driver a6 is withdrawn from the
nose a¹0 and up into its stationary guide a³, so as to clear the offset portion 5 of
the string nail carrier (see Figs. 5 and 6). When the driver has been lifted, the
head of a nail on the string 65 is engaged by the knife 68, and the latter commences
its downward or feed movement, which is effected by the cam 616 as above described
and substantially simultaneously with or just previous to the commencement of
the downward movement of the knife 68, the carrier shaft a¹5 is rocked a sufficient

page_text: distance to place the passage b³ into line with the passage in the nose a¹, and when
in this position, shown in Figs. 7 and 9, the carrier a¹² remains stationary while
the knife 68 is feeding the string nail into the passage in the nose; and when the
knife is brought into engagement with the top surface of the nose a¹0 (see Figs. 9
and 10), the head of the nail is substantially flush with the said surface, and the
knife and string nail carrier are then simultaneously moved toward the stationary
guide a', a sufficient distance to permit the knife to completely sever the nail in
the nose from the string in the passageway 63 of the carrier. The string nail
carrier and knife are then moved back into their starting position represented in
Fig. 6, so as to uncover the passage in the nose and permit the driver to descend
into the nose and force the nail into the material. When the carrier a¹ is moved
back into its starting position represented in Fig. 6, the knife 68 is also moved
back with the crank 62, and, at the same time, it is moved upward from the
position shown in Fig. 9 to that shown in Fig. 6, by the spring 62.
When it is desired to drive the nails of the string 66, the operator releases the
pressure upon the heel plate 661, which action places the operation of the machine
under control of the disk 40, so that as soon as the recess a³¹ comes under the
roller the brake-lever at is turned on its pivot by its spring, and the brake-
shoe is engaged with a pulley a" and the machine is stopped.
The operator then turns the lever a20 in a horizontal plane in the direction
..cated by arrow 20, Fig. 4, until the projecting lug 660 is in line with the slot
er recess in the gage block 663, which movement rocks the shaft a¹8 through
e toothed segment and the segmental gear a, and by means of the
gear and gear teeth a moves the rock-shaft a longitudinally and places the
slot or passage b in the carrier a¹² into line with the nose. The machine is now
in condition to be started to drive nails from the string 66, and this is effected by
the operator depressing the treadle so as to release the brake and operate the
clutch.
The carrier rock-shaft as is limited in its movement in one direction by the
engagement of the carrier a12 with the stationary guide a² and in the opposite
direction by the roll engaging its cam b, or it may be by the adjusting screw 6180,
engaging the head A of the machine; and by means of the adjusting screw 6180,
the roller b' may be accurately positioned with relation to its co-operating cam b,
so as to enable the movement of the cutter arm 6 to vary according to the length
of nails.
The machine herein shown is well adapted for tacking rands c (see Fig. 1) on to
the sole of a boot or shoe, and to effect this particular work in a highly satis-
factory manner, the machine is provided with a feed mechanism for the work,
which latter is illustrated as the rand and sole.
The work feed mechanism consists, as herein shown, of a lever c² movable with
the string nail feed mechanism, and mounted, in the present instance, upon the
pivot 610 (see Figs. 1, 9 and 10) and retained thereon by screw c³ tapped into the
said pivot. The lever is preferably slotted or forked at its front end to straddle
the nose 10, and has its lower or bottom surface serrated, roughened or provided
with teeth, to engage the work and ensure the same being fed forward by the
lever c3 as will be described. The rands c of boots or shoes are usually made on a
bevel as represented in Fig. 1, and, for the best results, the fingers 5c of the
forked lever care inclined so as to conform to the beveled or inclined surface of
the rand.
The feed lever c³ is preferably spring-pressed down upon the work, which may
be accomplished by means of a spring e fastened at one end to a lug or arm 8
on the lever and at its other end to the crank 612. The work feed lever c* is
moved forward to feed the work by a lug or finger co on the crank b₁, which
extends back of the feed lever and against, which it is held by the spring c², so
that as the crank 612 moves forward to carry or feed the nail into the nose 10, the
work feed lever will also be moved forward from the position shown in Fig. 6

page_text: to that shown in Fig. 9, and when the crank b12 has moved forward to sever the nail
in the nose, the lever c² will be moved forward to the limit, and the work will be.
properly positioned to receive the nail in the nose when the driver descends.
The work is preferably held upon a support of a construction as will now be
described.
Referring to Fig. 1, the post A2 is shown as provided with a lug or projection d
having a socket in which is removably secured as by a set screw d', the depending
arm d² of a bracket D, provided at its outer end with two hollow vertical arms d³ d
substantially in line with the nose a¹ and separated from each other by a space
or opening d³.
The hollow arm №³ contains within it, a rod or post do having a socket in its
lower portion for the reception of a supporting spring d³, which latter is extended
into a socket in an adjusting screw vertically movable in and through a threaded
opening in the arm d' of the bracket D.
The upper end of the rod d is reduced in diameter to form a shoulder d¹0, and
the reduced portion is provided with a longitudinal slit d2 and is also provided
with a socket which extends, as shown in Fig. 1, into the solid portion of the
rod do, and in which is inserted a stem or pin di³ having a rounded head d¹ which
forms a removable top for the rod do, and which in practice is preferably made of
hardened steel.
serves
to
secure
the sleeve
The rod de has also fitted upon its reduced portion a sleeve №15 which rests upon
the shoulder 10 and which has a substantially wide annular rim or flange d¹6,
having its upper surface substantially in line with the upper surface of the
head, so as to form a substantially broad or wide supporting surface or head
for the post . The sleeve d¹ is secured to the reduced portion of the post or
rod d by a set screw d¹, which bears against one-half of the split portion of the
on the post and also to
post and which
bind
stem d13 of the head. d4 The post dis
or clamp the pin or
yieldingly supported by the spring and is capable of moving vertically in the
hollow arm d³, and to prevent rotation of the post do, the lower portion of the
said post has clamped to it by a set screw (120, a split collar d21 having projecting
fingers 22, only one of which is shown in Fig. 1, but which straddle a pin or
rod 220 carried by the arms d³, d*. The collar d21 is shown as provided with a
handled to enable the operator to lower the post, and the said collar also serves
as a stop to limit the upward movement of the post do.
The bracket D has also secured to it as by screw 30, an arm 31 extended over
the head of the work support and constituting a gage for the work, the said gage
being adjustably secured to the bracket 1 to be moved toward and from the post,
In practice,
by the screw 30 extended through a slot din said gage or arm.
the operator holds the work against the end of the gage d31, which ensures the nails
or tacks being driven into the work a uniform distance from the edge of the work.
By making the shaft a of substantially large diameter, the operating cams may
be made integral with it, which avoids imperfect working of the machine due to
the cams becoming loose on the shaft, and which also simplifies the construction
and lessens the cost of the machine. The brake mechanism is so adjusted with
relation to the operating parts of the machine, that the shaft a is stopped in its
rotation with the knife 68 and its carrier 69 in their elevated or starting position,
with the knife resting on the shield or guard 631, so that, the multiple string nail
carrier may be shifted without danger of the string nails striking the said knife
and to absolutely avoid the danger of the nails striking the knife, which might
break the string nail or bend it so as to render the machine inoperative, the lever
which shifts the string nail carrier, is locked from movement to effect the shifting
of the carrier until the brake has engaged and stopped the main shaft of the
machine.
When the machine is used for other work than tacking rands, the rand feed
5

page_text: attachment may be removed, and the work-supporting bracket 1) may be swung
around out of the way by loosening the screw d, and when swung around, it may
be again secured by the said set screw.
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. A machine of the character described, comprising a multiple string nail
carrier, a shaft provided with teeth and to which said carrier is attached, a
vertically arranged rock-shaft provided with a gear in mesh with the teeth on the
rock-shaft, and means located below the multiple string nail carrier to rotate said
rock shaft, substantially as described.
A machine of the character described, comprising a multiple string nail
carrier, a rock-shaft to which it is attached, a crank attached to said rock-shaft, a
string nail feed mechanism, and a main shaft having cams integral therewith and
of less diameter than the diameter of the said shaft, to act on the said crank and
the said feed mechanism, substantially as described.
3. A machine of the character described, comprising a reciprocating driver,
a nose having a passage in line with said driver, a stationary driver guide having
a guideway in line with the passage in the nose and extended toward the said
nose to form a substantially long bearing for the driver, a multiple string nail
carrier having its lower end offset and normally out of line with the driver and
the passage in the said nose, mechanism to move the offset portion of the multiple
string nail carrier into line with the passage in the nose and across the same, nd
a cutter to sever the nail in the nose from the string nail in the said carrier,
substantially as described.
4. A machine of the character described, comprising a reciprocating driver, a
nose having a passage in line with said driver, a stationary driver guide having a
guideway in line with the passage in the nose and extended toward the said
nose to form a substantially long bearing for the driver, a multiple string nail
carrier, a cutter or knife co-operating with said carrier and with the said nose,
an arm carrying said knife, a rock-shaft provided with the crank 612 to which the
knife-carrying arm is secured, a second crank 617 attached to the said rock-shaft,
and an adjusting screw 6180 carried by the crank 617, substantially as described.
5. A machine of the character described, comprising a multiple string nail
carrier, a rock-shaft provided with gear teeth and to which said carrier is attached,
a vertically arranged rock-shaft, a gear on said rock-shaft in mesh with the teeth
on the rock-shaft to which said carrier is attached, a foot treadle movable in a
substantially horizontal plane, and gearing connecting said foot treadle with the
vertically arranged rock-shaft, substantially as described.
6. A machine of the character described, comprising a work support, a string
nail feed mechanism consisting of a cam actuated rock-shaft provided with a crank,
a knife carrier pivotally connected to said crank, and a knife secured to said
carrier to engage said string nails, and a work feeding arm or lever pivotally,
connected with said crank or arm and movable with the knife carrier to feed the
work as the string nail is being fed, substantially as described.
7. A machine of the character described, comprising a work support, a bracket
in which said work support is vertically movable, a spring to sustain said work
support, a spring-supporting screw adjustable in an arm of said bracket below and
in line with said work support, and means attached to said work support to lock
the same against rotation, substantially as described.
8. A machine of the character described, comprising the post de having its
upper portion reduced in diameter to form a shoulder, split longitudinally, and
provided with a socket, a pin or stem inserted in said socket and provided with a
head, a sleeve fitted over the reduced portion of the post de and provided with an
annular flange substantially in line with the head on the said pin, and means to

page_text: fa-ten said sleeve to the post and clamp the said pin or stem, substantially as
described.
9. A machine of the character described, comprising the bracket D provided
with the arms d³ d*, a post provided with a socket in its lower end, a spring inserted
in said socket, an adjusting screw extended through the arm d and provided with
a socket for the reception of the lower end of said spring, a collar secured to the
said post between the arms 3 d and provided with a handle to lower the post,
and means to prevent the said post rotating, substantially as described.
10. A machine of the character described, comprising a starting mechanism for
said machine, a lever movable in a substantially vertical and in a substantially
horizontal direction, means to connect the said lever with the said starting
mechanism, a rock-shaft capable of longitudinal movement, a string nail carrier
attached to said rock-shaft to move therewith, and means to connect said rock-
shaft with the said lever to effect longitudinal movement of the rock-shaft by the
movement of the said lever in a substantially horizontal direction, substantially as
described.
11. A machine of the character described, comprising a multiple string nail
carrier having a rocking and a longitudinal movement, a knife co-operating with
said string nail carrier, a carrier for said knife, a guard or shield for the string
nails attached to said string nail carrier and with which said knife co-operates
in its normal or starting position, a rotatable shaft provided with cams to rock
said string nail carrier and to effect the movement of the said knife, a lever con-
nected to the string nail carrier to effect its longitudinal movement, and a brake
mechanism for said shaft adjusted with relation to the cams thereon, to stop the
rotation of the said shaft with the said knife in its starting or normal position
with the said shield or guard between the knife and the string nails, whereby the
string nail carrier may be moved longitudinally without danger of the spring
nails engaging the said knife, substantially as described.
13. A machine of the character described, comprising a multiple string nail
carrier, a longitudinally movable rock-shaft to which said carrier is attached, a
foot treadle, and intermediate mechanism to connect said foot treadle with the said
rock shaft to effect longitudinal movement thereof, substantially as described.
1 1
1
1007
LILC
D. YOUNG & Co.,
11 and 12 Southampton Buildings, London, W.C., Agents for the Applicant.