Year: 1886

page_text: I, ALEXANDER ANDERSON, Manager of the Singer Manufacturing Company's
Works Kilbowie, Dumbartonshire, do hereby declare the nature of this invention
(a communication to me from abroad by The Singer Manufacturing Company of
New York, in the United States of America, Sewing Machine Manufacturers) to be
as follows:-
My invention relates to a button-hole attachment similar in construction and
operation to that embraced in my application for Patent No. 15523 dated 17th
December 1885, the present invention relating to certain improvements on my
former attachment whereby the ends of the button-holes are better finished and
certain adjustments, not provided for by my former device, can be made.
The base-plate by which the attachment is secured to the work plate of the
sewing machine is provided with upwardly projecting ribs or standards and with
slots. The vibrating and longitudinally reciprocating feed bar is pivoted near its
centre on an adjustable pin or lug passing through a central longitudinal slot in
said bar and entering the steadying slot in the base plate, said pin being carried
by an adjustable arm or slide having a loop by which it is adjustably secured to
one of the ribs or standards by a set screw. The feed bar carries at its forward
end the cloth-clamp, the upper jaw of which is movable and is pivoted by means
of pins on the outer sides of the rear end of said jaw entering holes in ribs on
the outer edges of the feed bar.
The clamping lever is pivoted to a post attached to the feed bar, a transverse
spring placed beneath the rear end of the jaw and having an opening, through
which the post passes serving to lift said jaw to release the work when the outer
end of the clamping lever is raised.
The operating lever is pivoted at its rear end to the same rib or standard by a
pin and is forked at its forward end for engagement with the needle bar screw, as
is usual. The operating lever is provided with an arm having a pin entering a
guiding slot in the standard said arm and pin thus serving to steady said lever and
limit its movement. The other standard sustains transverse supports in which is
journalled a shaft carrying at its forward end an operating ratchet wheel, having
six teeth, and at its rear end a three pointed cam working in a transversely sliding
yoke having lugs or ears passing through openings in the standards, said yoke being

page_text: connected with the feed bar, as will be described, so as to impart lateral or vibrating
movements thereto. The ratchet wheel and cam are both rigidly secured to the
shaft so as to rotate therewith. On the shaft is journalled a double screw made
in the form of a sleeve and to said sleeve is attached a ratchet wheel by which
it may be intermittingly rotated by means of an oscillating pawl loosely pivotted
on the hub of the said sleeve. This pawl is provided with a lug for engaging the
teeth of the ratchet wheel and with teeth for engagement with the toothed outer
end of a lever pivotted on a pin and operated by the lug on the operating lever before-
mentioned. The lug enters a slot between the main portion of the toothed lever
and an adjustable spring arm having a small lug for engagement with notches on
the toothed lever. By pressing outward on a finger-piece of the spring arm the
lug will be disengaged from that one of the notches in which it rests and the said
arm will then be free to be raised or lowered to vary the distance between the same
and the main portion of the toothed lever so that there will be more or less lost
'motion between the lug on the operating lever and the toothed lever. By virtue
of the construction just above described the amount of rotation of the screw-sleeve,
at each stroke of the needle-bar, may be varied although operated from the
uniformly moving forked lever which is operated by the needle-bar screw.
•
The six toothed ratchet wheel is operated by an oscillating pawl pivotted
loosely on the ratchet shaft and having a lug for taking into the teeth of the said
ratchet wheel and being also provided with teeth for engagement with a rack of a
second toothed lever pivotted on a pin and having a loop embracing the operating
lever so as to be operated thereby. The loop loosely embraces the lever laterally
BO that a slight lateral movement of the toothed lever, may occur as the latter
vibrates vertically with the operating lever. The toothed levers are both con-
structed so that they will have a tendency to spring towards their pawls and in
said pawls slightly elongated openings are formed so that slight lateral movements
of said pawls are possible. Thus as said pawls are oscillated the operating lugs
thereon will slide over the teeth of the ratchet wheel, but will be held in constant
engagement therewith by the resistance of the spring levers. The longer diameters
of the openings are arranged at an inclination to a vertical plane so that when
Baid pawls engage their ratchet wheels they will be held in contact there with to
rotate the wheels until released therefrom by the reverse or downward movement
of the operating lever. Backward movements of the ratchet wheels are prevented
by a forked detent spring engaging both of said wheels.
A slide having a projection working in a guiding slot in the standard has a yoke
engaging the double screw and running between the threads thereof, the opening
in said yoke through which said screw passes being sufficiently large so that the
yoke may be shifted laterally to bring one side or the other thereof into engage-
ment with said screw. When one side of the yoke is in engagement with the
screw it will run in a thread running in one direction, but when the opposite side
of the yoke is engaged with the opposite side of the screw said yoke will engage
a thread running in the other direction, and the movement of the slide will thus
be reversed.
The slide is provided with a slot through which passes the post on the feed bar,
and the longitudinal movements of the said slide are thus imparted to the said
feed bar; and owing to the slot at the point of connection of those parts, the feed
bar is capable of vibrating laterally independently of the slide the latter being held
from lateral movements at its forward end by a lug which travels in a slot in the
base plate. The slide has in its centre a spring tongue provided with a stud and
a lug engaging a slot in the lower part of the yoke thus forming a connection
between the yoke and the tongue so that they will move laterally together but
permitting the tongue to move vertically to a limited extent independently of the
yoke.
A regulator for varying the lengths of the button holes is adjustably connected
to the feed bar by means of a lug adapted to engage one of the notches in the side
of the feed bar the lug being on an arm which is vertically movable to disengage

page_text: said lug from said notch. The regulator is provided at its forward end with an
incline extending beneath a lateral projection in the spring tongue said tongue,
being thus slightly lifted as it passes over said incline. A small bar rigidly attached
to supports is provided with a series of notches of varying height and near its rear
end with another notch, these notches being of proper width to admit of the passage
through them of the stud on the spring tongue.
The slide is provided with a spring connected to said slide at the forward end of
the latter, the free rear end of said spring, pressing against the standard and thus.
having a tendency to force the rear end of the slide, and the yoke carried thereby,
away from said standard or towards the operating lever. This tendency is however
for a time counteracted by the stud which is pressed against the notched bar
by said spring, said stud while on the side of said bar nearest said spring..
holding the front side of the yoke in engagement with the front side of the double
screw until the stud reaches a notch of proper height to permit it to pass under
the notched bar when the stud is forced to the other side of the bar bringing the,
rear side of the yoke in engagement with the rear side of the screw and thereby
reversing the movement of the slide and of the feed bar connected therewith.
As the feed-bar in its backward movement approaches the rear end of the
button-hole the bent free end of a spring passes outward through a small opening.
in the standard thus reversing the stress of the spring so that when the stud
reaches the notch it will be pulled through the same by said spring by reason of,
the hold which the bent or inclined free end thereof will have at this moment in
the slotted standard, and the slide and yoke will thus be brought to their first
position in readiness to move the feed bar forward again. The length of the
button holes is increased by sliding the regulator and the incline thereon rearward
or away from the cloth clamp thus lifting the spring tongue slightly so that the
stud thereon will pass by the lower of the notches and will not be forced under the
notched bar until it reaches one of the higher notches towards the forward end of
said bar; while by moving the regulator in the opposite direction so that the stud
can pass under one of the lower notches the button-holes will be shortened.
The sliding yoke is indirectly connected with the feed-bar through the shipper-
lever said yoke having a piu, entering a hole in the said lever, and serving as a
fulcrum therefor, the lever having an adjustable connection with the feed bar by
means of a screw which secures the arm of said lever to a small block entering a
slot in the feed bar and thus permitting said bar to slide longitudinally while the
shipper lever remains relatively stationary. The feed bar is also provided with
shipping slots or grooves communicating at their forward ends by a doubly inclined
switch groove or slot, and the shipper lever is provided with a spring arm having at
its outer end a guiding stud entering the said slots or grooves. The regulator is
provided at its rear end with an arm having a steadying lag fitting the groove,
Baid arm having a small double inclined switch-groove. Just before passing the
points of the switch-grooves or slots the stud is preferably lifted slightly by small,
inclines in the bottoms of these grooves or slots, so that said stud can pass said.
points easily and be properly guided in its reverse movements.
The shipper lever is ordinarily held rigid relative to the feed bar by being con-
nected with said bar at two points by a stud and block so that the lateral movements.
of the sliding-yoke are communicated to said bar through the said lever; but when
the position of the latter is changed, as the stud passes from one of the shipping:
slots or grooves to the other, the position of said feed bar will be shifted, so that
when one side of the button-hole has been worked the other side thereof will be
brought in proper position beneath the needle of the sewing machine. This shifting
of the feed bar laterally occurs while the needle is making several stitches, half of
the lateral or shifting movement being made before the feed is reversed (this reversal
being sudden) and the other half occurring afterwards thereby strongly barring and
neatly finishing the ends of the button holes.
Owing to the adjustable connections of the shipper lever and feed bar by means of
the screw, block and slotted arm the shipping or lateral movement of the feed lever

page_text: may be varied to alter the distance between the two rows of stitching on the
opposite sides of the button-hole, and thereby adapt the work to different kinds of
fabrics. Thus by moving the adjusting screw nearer to the yoke the pin on which
forms the fulcrum of the shipper lever the shipping movement will be diminished,
while by moving said screw further from said yoke the said movement will be
increased.
The lengths of the vibrations of the feed bar to increase or diminish the depths
or lengths of the overseaming stitches may be varied by adjusting the pivot pin of
the feed-bar towards or from the cloth clamp, the length of the overseaming stitches
being increased as the said pivot pin is moved towards the yoke from which the
feed bar receives its vibrating movements, and the said overseaming stitches being
diminished in extent as the said pin is adjusted in the opposite direction or towards
the cloth clamp.
The longitudinal movements of the feed-bar, by which the distance apart of the
overseaming stitches is determined, may be varied by adjusting the arm relative
to the spring lever in the manner herein before described, so as to make more or
less lost motion between the said lever and the operating lever as fully stated,
thereby varying the rotation of the screw shaft to make the longitudinal or feeding
movements of the feed bar faster or slower as may be desired.
"
The lengths of the hutton holes may be varied by shifting the regulator back
and forth to vary the distance of the switch groove on the arm of said regulator
from the switch-groove in the feed bar, this movement of the regulator also simul-
taneously changing the position of the incline for the purpose already stated.
Thus my present device has four adjustments so that it is capable of a great
range of work.
Motion being imparted to the operating lever the toothed levers moving there-
with will impart intermittent rotary movements to the shaft through the pawls and
ratchet wheels. As the ratchet wheel on the shaft has six teeth and the cam thereon
has three points or actuating parts the sliding yoke will be reciprocated by said cam
so that the lateral position of said bar will be changed at each upward movement.
The movements of the yoke are imparted to the feed. bar to vibrate the latter
through the shipper lever as has been described. In the device embraced by my
former application for Patent before referred to the cam for vibrating the feed-bar
was rigidly attached to the screw shaft by which the longitudinal or feeding move-
ments were imparted to the feed bar so that no means were provided for varying
the distance apart of the stitches but in the present device the double screw is
formed in a sleeve rotating independently of the cam shaft so that the feed may be
adjusted by varying the lost motion between the levers as above stated. As the
screw shaft rotates, the yoke, one side of which is in engagement therewith and
which is integral with or secured to the slide, moves the said slide and the feed bar
which is connected with said slide longitudinally until the stud on the spring
tongue of said slide is forced by the spring to one side or other of the notched bar
through one of the notches in said bar thereby bringing the opposite side of the
yoke in engagement with the opposite side of the double screw and thus reversing
the movement of the slide and feed bar. At the time this reversal of the movement
of the feed bar occurs the said bar while continuing its lateral vibrations to form
the overedge stitches is being gradually shifted laterally by the shipper lever in the
manner hereinbefore described and the feed bar continues its movements to its first
position to complete the button-hole..
Dated this Second day of Fabra 1988
CRUIKSHANK & FAIRWEATHER,
135, Buchanan Street, Glasgow,
Agenta.

page_text: Improvements in Button-hole Attachments for Sewing
Machines.
I, ALEXANDER ANDERSON Manager of the Singer Manufacturing Company's
Works, 'Kilbowie, Dumbartonshire, do hereby declare the nature of this invention
and in what manner the same is to be performed as communicated to me to be
particularly described and ascertained in and by the following statement :-
My invention relates to a button-hole attachment similar in construction and
operation to that embraced by my application for Patent No. 15523 dated 17th
December 1885, the present invention relating to certain improvements on my
former attachment, whereby the ends of the button-holes are better finished, and
certain adjustments not provided for by my former device can be made.
In the drawings forming part of this specification, figure 1 is a front side
elevation of my improved attachment, and figure 2 is a plan of the same. Figure 3
is a front end elevation, partly in section on the line 4 4 figure 2. Figure 4,
is a rear end elevation. Figure 5 is a longitudinal section showing some parts in
elevation, and figure 6, is a rear side elevation. Figure 7, is a plan view of the
base plate. Figure 8, is a detail plan view showing the feed bar, the slide carrying
the adjustable fulcrum-pin for said bar, and the regulator for varying the lengths
of the button holes. Figure 9, is a perspective view of the slide by which the
feed bar is moved longitudinally, and figure 9, is a bottom view of the same.
Figure 10 is a detail view of the sliding yoke by which the feed bar is vibrated
laterally. Figures 11 and 12 are detail views of the oscillating pawls. Figure 13,
is a plan view of the shipper lever and figure 13 is a perspective bottom view of
the same. Figures 14 and 15 are detail views of the operating levers for the
double screw and the cam shaft, and figure 16, is a detail section showing the
adjustable fulcrum for the feed bar.
Similar letters refer to corresponding parts in the different figures.
A, denotes the base plate by which the attachment is secured to the work plate
of the sewing machine, said base plate being provided with upwardly projecting
ribs or standards a and a', and with slots a and a³.
B, is the vibrating and longitudinally reciprocating feed bar, pivotted near its
centre on an adjustable pin or lug, b, passing through the central longitudinal slot 610,
in said bar, and entering the steadying slot a' in the base plate, said pin being
carried by an adjustable arm or slide, O, having a loop o, by which it is adjustably
secured to the standard a by a set screw o'. The feed-bar carries at its forward
end the cloth-clamp, the movable upper jaw, C, of which is pivotted by means of
pins c on the outer sides of the rear end of said jaw, entering holes in ribs b¹, on
the outer edges of the feed bar. The clamping lever c¹ is pivotted to the post b³,
attached to the feed bar, a transverse spring, c³, placed beneath the rear end of the
jaw C, and having an opening through which the post 63 passes, serving to lift said
jaw to release the work when the outer end of the clamping-lever is raised.
D, is the operating lever, pivotted at its rear end to the standard a, by the
pin a, and forked at its forward end for engagement with the needle-bar screw,

page_text: as is usual. The lever D, is provided with an arm d, having a pin d', entering a
guiding slot a, in the standard a, said arm and pin thus serving to steady said
lever and limit its movement. The standard a' sustains transverse supports a', in
which is journalled the shaft E, carrying at its forward end the operating ratchet-
wheel e, having six teeth, and at its rear end the three pointed cam e², working in
the transversely-sliding yoke F, having lugs or ears f passing through openings in
the standards a and a¹, said yoke being connected with the feed bar, as will be
described, so as to impart lateral or vibrating movements thereto. The ratchet
wheel and cam e¹ are both rigidly secured to the shaft E, so as to rotate
therewith.
On the shaft E, is journalled the double screw G, made in the form of a sleeve,
and to said sleeve is attached the ratchet wheel g, by which it may be intermit-
tingly rotated by means of an oscillating pawl g¹, loosely pivotted on the hub g*
of the said sleeve. The pawl g¹ is provided with a lug, g³, for engaging the teeth
of the ratchet wheel, and with teeth g, for engagement with the toothed outer
end of the lever H, pivotted on the pin a, and operated by the lug on the
lever D. The lug enters a slot h, between the main portion of the said lever H,
and an adjustable spring-arm, h³, having a small lug, h³, for engagement with the
notches h³, on the lever H. By pressing outward on the finger piece h* of the
arm h¹ the lug h³ will be disengaged from that one of the notches h³ in which it
rests, and the said arm will then be free to be raised or lowered to vary the
distance between the same and the main portion of the lever H, so that there will
be more or less lost motion between the lug on the lever D, and the lever H.
By virture of the construction just above described the amount of rotation of the
screw-sleeve G at each stroke of the needle bar may be varied although operated
from the uniformly moving lever D.
The ratchet-wheel e is operated by the oscillating pawl e³, pivotted loosely on
the shaft E, and having a lug e, for taking into the teeth of the said ratchet-wheel
and being also provided with teeth e for engagement with the rack i of the lever I,
pivotted on the pin a, and having a loop, embracing the lever D, so as to be
operated thereby. The loop loosely embraces the lever D, laterally as shown in
figure 3, so that a slight lateral movement of the lever I, may occur as the latter
vibrates vertically with the lever D. The levers H, and I, are both constructed so
that they will have a tendency to spring toward the pawls g¹ and e³, respectively,
and the openings 9° and e' in said pawls are slightly elongated, as shown in
Figs. 11 and 12 so that slight lateral movements of said pawls are possible. Thus
as said pawls are oscillated the operating-lugs g³ and e³ thereon will slide over the
teeth of the ratchet wheels, but will be held in constant engagement therewith
by the resilience of the spring levers H and I. The longer diameter of the
openings go and es are arranged at an inclination to a vertical plane, so that when said
pawls engage their ratchet wheels they will be held in contact therewith to rotate
the wheels until released therefrom by the reverse or downward movement of the
lever D. Backward movements of the ratchet-wheels e and g, are prevented by
the forked detent-spring J, engaging both of said wheels.
K, is a slide having a projecton k, working in a guiding-slot in the standard a',
said slide having a yoke k', engaging the double screw G, and running between
the threads thereof, the opening in said yoke through which said screw passes
being sufficiently large so that the yoke may be shifted laterally to bring one
side or the other thereof into engagement with said screw.
When one side of the
yoke is in engagement with the screw, it will run in a thread running in one
direction ; but when the opposite side of the yoke is engaged with the opposite
side of the screw said yoke will engage a thread running in the other direction,
and the movement of the slide will thus be reversed.
The slide K, is provided with a slot, ³, through which passes the post b³, on the
feed bar, and the longitudinal movements of the said slide are thus imparted to
the said feed-bar, and owing to the slot k at the point of connection of those
parts the feed-bar is capable of vibrating laterally independently of the slide, the.

page_text: latter being held from lateral movements at its forward end by the lug k³, which
travels in the slot a³ in the base plate. The slide K, has in its centre a spring-
tongue 4, provided with a stud ko, and a lug k, the latter engaging a slot k in the
lower part of the yoke k¹, thus forming a connection between the yoke and the
tongue, so that they will move laterally together, but permitting the tongue to
move vertically to. a limited extent independently of the yoke.
L, is the regulator for varying the lengths of the button-holes, said regulator
being adjustably connected to the feed-bar by means of the lug 2 on the arm 1,
which lug is adapted to engage one of the notches bs in the side of the feed bar,
said arm being vertically movable to disengage said lug from said notch. The
regulator L, is provided at its forward end with an incline extending beneath
a lateral projection k³, on the spring-tongue k, said tongue being thus slightly
lifted as it passes over said incline.
M, is a small bar rigidly attached to the supports a' and provided with a series
of notches m, of varying heights, and near its rear end with another notch m¹
these notches being of proper width to admit of the passage through them of the
stud, on the spring tongue k³.
The slide K, is provided with a spring /³, connected to said slide, at the forward
end of the latter, the free rear end of said spring, when the parts are in the position
shown in figure 2, pressing against the standard a¹ and thus having a tendency to
force the rear end of slide K, and the yoke k¹ carried thereby away from said
standard, or toward the operating lever D. This tendency is, however, for a time
counteracted by the stud k, which is pressed against the bar M, by said spring,
said stud, while on the side of said bar nearest said spring, holding the front side
of the yoke k¹ in engagement with the front side of the double screw G, as in
figure 2, until the stud reaches a notch of proper height to permit it to pass under
the bar M, when the stud is forced to the other side of the bar, bringing the rear
side of the yoke in engagement with the rear side of the screw, and thereby
reversing the movement of the slide and of the feed-bar connected therewith.
As the feed bar in its backward movement approaches the rear end of the
button-hole; the bent free end of the spring ko, passes outward through a small
opening, a; in the standard a' thus reversing the stress of the spring, so that when
the stud k reaches the notch m¹ it will be pulled through the same by said spring,
by reason of the hold which the bent or inclined free end thereof will have at this
moment in the slotted standard a¹, and the slide and yoke will thus be brought to
their first position, in readiness to move the feed-bar forward again. The lengths
of the button-holes are increased by sliding the regulator L, and the incline l
thereon rearward, or away from the cloth clamp, thus lifting the spring-tongue k
slightly, so that the stud thereon will pass by the lower of the notches m, and
will not be forced under the bar M, until it reaches one of the higher notches
toward the forward end of said bar, while by moving the regulator in the opposite
direction, so that the stud k can pass under one of the lower notches m, the
button-holes will be shortened.
The sliding yoke F, is indirectly connected with the feed-bar B, through the
shipper lever N, said yoke having a pin f1, entering a hole in the said lever, and
serving as a fulcrum therefor, the lever having an adjustable connection with the
feed bar by means of the screw n, which secures the armi n¹ of said lever to a
small block n³, entering the slot 610 in the feed-bar B, and thus permitting said bar
to slide longitudinally, while the shipper-lever remains relatively stationary. The
feed-bar is also provided with shipping slots or grooves 65, 66, communicating at
their forward ends by the doubly-inclined switch groove or slot 6', and the shipper-
lever is provided with a spring-arm n³, having at its outer end a guiding-stud n*,
entering the said slots or grooves. The regulator L, is provided at its rear end
with an arm, having a steadying-lug fitting the groove b, said arm having
a small doubly-inclined switch-groove 1, corresponding in form to the groove or
slot 6'. Just before passing the points of the switch grooves or slots the stud n', is
preferably lifted slightly by small inclines, as 4; in the bottoms of these grooves

page_text: or slots, so that said stud can pass said points easily and be properly guided in its
reverse movements.
The shipper-lever N, is ordinarily held rigid relative to the feed-bar B, by being
connected with said bar at two points by the stud n, and block n' so that the
lateral movements of the sliding yoke F, are communicated to said bar through
the said lever; but when the position of the latter is changed, as the stud n^,
passes from one of the slots or grooves 65, 66, to the other the position of said
feed-bar will be shifted, so that when one side of the button hole has been worked
the other side thereof will be brought in proper position beneath the-needle of the
sewing machine. This shifting of the feed-bar laterally occurs while the needle
is making several stitches, half of the lateral or shifting movement being made
before the feed is reversed, (this reversal being sudden) and the other half
occurring afterward, thereby strongly barring and neatly finishing the ends of the
button-holes.
Owing to the adjustable connections of the shipper-lever and feed-bar by means
of the screw n, block n³, and slotted arm n¹, the shipping or lateral movement
of the feed-bar may be varied to alter the distance between the two rows of
stitching on the opposite sides of the button holes, and thereby adapt the work
to different kinds of fabrics. Thus by moving the adjusting-screw n nearer to
the yoke F, the pin f¹ on which forms the fulcrum of the lever N, the shipping
movement will be diminished while by moving said screw farther from said yoke
the said movement will be increased.
The lengths of the vibrations of the feed-bar to increase or diminish the depths
or lengths of the overseaming stitches may be varied by adjusting the pivot-pin b
of the feed-bar toward or from the cloth-clamp, the length of the overseaming-
stitches being increased as the said pivot-pin is moved toward the yoke F, from
which the feed-bar receives its vibrating movements, and the said overseaming-
stitches being diminished in extent as the said pin is adjusted in the opposite
direction, or toward the cloth-clamp.
The longitudinal movements of the feed-bar, by which the distance apart of the
overseaming stitches is determined, may be varied by adjusting the arm relative
to the lever H, in the manner hereinbefore described, so as to make more or less
lost motion between the said lever and the operating lever D, as fully stated,
thereby varying the rotation of the screw-shaft G, to make the longitudinal or
feeding movements of the feed-bar B faster or slower, as may be desired.
The lengths of the button-holes may be varied by shifting the regulator L
back and forth to vary the distance of the switch groove 15 on the arm of said
regulator from the switch groove b' in the feed bar, this movement of the regulator
also simultaneously changing the position of the incline l, for the purpose already
stated. Thus my present device has four adjustments, so that it is capable of a
great range of work.
The operation of my invention will be readily understood from the foregoing.
Motion being imparted to the lever D, the levers H and I, moving therewith, will
impart intermittent rotary movements to the shafts E and G, through the pawls
and ratchet-wheels for said shafts. As the ratchet-wheel e on the shaft E, has six
teeth and a cam e¹ on said shaft has three points or actuating parts, it is obvious
that the sliding yoke F, will be reciprocated by said cam, so that the lateral
position of said bar will be changed at each upward movement. The movements
of the yoke F, are imparted to the feed-bar, to vibrate the latter, *through the
shipper-lever N, as has been described.
In the device embraced by my former application for Patent hereinbefore
referred to the cam for vibrating the feed-bar was rigidly attached to the screw-
shaft by which the longitudinal or feeding movements were imparted to the
feed-bar, so that no means were provided for varying the distance apart of the
stitches; but in the present device the double screw is formed in a sleeve rotating
independently of the cam shaft, so that the feed may be adjusted by varying the
lost motion between the levers D and H as abɔve stated,

page_text: As the screw-shaft G rotates, the yoke k¹, one side of which is in engagement
there with, and which is integral with or secured to the slide K, moves the said
slide and the feed-bar, which is connected with said slide, longitudinally until the
stud on the spring tongue k of said slide is forced by the spring to one side
or other of the bar M, through one of the notches m or m¹ in said bar, thereby
bringing the opposite side of the yoke in engagement with the opposite side of the
double screw, and thus reversing the movement of the slide and feed bar. At the
time this reversal of the movement of the feed-bar occurs the said bar, while
continuing its lateral vibrations to form the over-edge stitches, is being gradually
shifted laterally by the shipper-lever, in the manner herein before described, and
the feed bar continues its movements to its first position to complete the
button-hole.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, as communicated to
me, I declare that what I claim is :-
1. In a button-hole attachment for sewing machines, the combination, with the
feed-bar, and its cloth clamp, of a cam connected with said bar to vibrate the same
laterally a double screw rotating independently of said cam and connected with
said bar, for feeding the latter longitudinally, and mechanism for intermittingly.
rotating said cam and screw.
2. In a button-hole attachment, the combination, with the feed bar and its cloth
clamp, of a shaft having a cam and a ratchet wheel, a sliding yoke connected with
said feed-bar, in which said cam works, a double screw connected with said
feed-bar and adapted to rotate independently of the cam-shaft, a ratchet-wheel for
operating said double screw, pawls for rotating said ratchet-wheels, an operating
lever, and two levers connected with the said operating-lever for actuating said
pawls, as set forth.
3. In a button-hole attachment the combination, with the feed bar and its cloth
clamp, of the cam and screw shafts connected with said feed bar and provided with
ratchet wheels, pawls for intermittingly rotating said wheels, an operating lever,
and two levers connected with the said operating lever, but adapted to spring
horizontally as they vibrate vertically substantially as set forth.
4. In a button-hole attachment, the combination, with the feed bar, cloth clamp,
screw and cam shafts connected with the feed-bar, and ratchet wheels on said shafts,
of two pawls having teeth, two actuating-levers having teeth engaging the teeth
of the pawls, and an operating lever for vibrating the pawl-actuating levers,
substantially as set forth.
5. In a button-hole attachment, the combination, with the laterally vibrating
feed bar and its cloth clamp, of a screw for feeding said bar longitudinally, a
ratchet wheel attached to said screw, a pawl, an operating-lever, and a lever for
actuating said pawl, adapted to impart variable movements to the latter from the
uniformly-vibrating operating-lever, substantially as set forth.
6. In a button-hole attachment, the combination, with the laterally-vibrating.
feed-bar and its cloth clamp, of an intermittingly rotating double screw and a yoke
connected with said feed-bar and embracing said screw, said yoke being laterally
adjustable to bring its opposite sides into engagement with the opposite sides of
said double screw, substantially as set forth.
7. In a button-hole attachment, the combination with the slotted base plate,
and the feed bar having a central longitudinal slot, of an adjustable arm or slide
carrying a pivot pin for said feed-bar, said pin passing through the said slot in the
latter and entering a steadying slot in the said base plate, substantially as set forth.
8. In a button-hole attachment, the combination, with the slotted base-plate, the
vibrating feed-bar, and its cloth clamp, of a slide having a pin or lug passing
through a lateral slot in the feed bar into a steadying-slot in the base plate, said
slide having also a yoke, and an intermittingly-rotating double screw embraced by
said yoke, substantially as set forth.

page_text: 9. In a button-hole attachment, the combination, with the laterally-vibrating
feed-bar and its cloth clamp, of an intermittingly rotating double screw, a slide
having a yoke loosely embracing said screw, a spring, ask and a spring tongue
having a stud, a bar having a series of notches of varying heights, and a regulator
having an incline for lifting said tongue, substantially as set forth.
10. In a button-hole attachment, the combination, with the feed-bar having the
communicating shipping-slots 65 b6, and mechanism for vibrating and longitudinally
reciprocating said feed-bar, of a shipper-lever baving an arm connected with said
feed-bar, and a second arm provided with a stud adapted to traverse said slots,
substantially as set forth.
11. In a button-hole attachment, the combination, with the feed bar having the
shipping-slots 6 6º, communicating at one of their ends, and mechanism for
operating said feed-bar, of a shipper-lever connected with said feed-bar, and
engaging said shipping slots, and a regulator grooved to form a switch-connection
for the other ends of said slots, and adjustable to vary the working length thereof
to adapt them for different lengths of button-holes, substantially as set forth.
12. In a button-hole attachment, the combination, with the vibrating and
longitudinally-reciprocating feed-bar having communicating shipping slots, of a
shipper-lever having two arms, one of which is adjustably connected with said
feed-bar, and the other of which engages said slots, substantially as set forth.
1000