IMPROVEMENTS IN BUTTON-HOLE STITCH SEWING MACHINES
Year: 1885

page_text: I, GEORGE BROWNING of 104 Dale Street, Tradeston, Glasgow, in the County of
Lanark, North Britain, Mechanician do hereby declare the nature of the said
invention for IMPROVEMENTS IN BUTTON-HOLE STITCH SEWING MACHINES to be as
follows:
-
This Invention, which relates to improvements in button-hole stitch sewing
machines, consists of certain novel arrangements whereby, what is known as a lock
or shuttle stitch is sewn in button-holes.
The essential feature of improvement consists in making the oscillating hook
duplex, that is to say having two points each of which at alternate oscillations,
catches the upper thread and passing it round over itself releases it at the proper
point thereby causing the loop of the upper thread to pass over the case containing
the bobbin which carries the under thread.
The double pointed hook, in its oscillations, is so arranged that one of its points
catches the loop of the upper thread when it descends through the slit of the
button-hole whilst the other point catches the loop of the upper thread when the
needle descends through the cloth of the button-hole, it being explained that
the needle, having a zig-zag motion, is used.
In order to maintain the bobbin and its case in the cuplike hollow formed in the
double-pointed oscillating hook, a bar, preferably round, projects over or across
the face of the bobbin case which carries the under thread, and this bar is
arranged on a pivot so that it can be turned round thereon when it is necessary to
remove the bobbin case.
In order to properly direct and tighten the under thread, a lever is employed
having a V-groove therein the opposite sides of which direct the under thread and
tighten it by virtue of the sides of the said V-groove in the said lever alternately
pressing against the underthread in proper co-relationship with the alternating
throws of the double lever. This lever carrying the V-groove is actuated from
cams driven from the vertical shaft of the machine or by any suitable equivalent
means.
The oscillating double hook is driven by a pinion on the shaft by which the said
hook is carried, such pinion being actuated by a rack driven from a cam upon the
vertical shaft of the machine.

page_text: Improvements in Button-hole Stitch Sewing Machines.
I, GEORGE BROWNING of 104 Dale Street, Tradeston, Glasgow, in the County of
Lanark, North Britain, Mechanician do hereby declare the nature of my invention
for IMPROVEMENTS IN BUTTON-HOLE STITCH SEWING MACHINES and in what manner
the same is to be performed, to be particularly described and ascertained in and by
the following statement:
.
My Invention, which relates to improvements in button-bole stitch sewing
machines, consists of certain novel arrangements whereby, what is known as a lock
or shuttle stitch is sewn in button-holes.
The essential feature of improvement consists in making the oscillating hook
duplex, that is to say, having two points, each of which, at alternate oscillations,
catches the upper thread and passes it round over itself, releases it at the proper
point thereby causing the loop of the upper thread to pass over the case containing
the bobbin which carries the under thread.
The double pointed hook, in its oscillations, is so arranged that one of its points
catches the loop of the upper. thread when it descends through the slit of the
button-hole, whilst the other point catches the loop of the upper thread when
the needle descends through the cloth of the button-hole, it being explained that
the needle having a zig-zag motion, is used.
-
In order to maintain the bobbin and its case in the cup-like hollow formed in
the double pointed oscillating hook, a bar, preferably round, projects over or
across the face of the bobbin case which carries the under-thread, and this bar
is arranged on a pivot, so that it can be turned round thereon when it is necessary
to remove the bobbin case.
In order to properly direct and tighten the under thread, a lever is employed
having a V-groove therein, the opposite sides of which direct the under thread.
and tighten it by virtue of the sides of the said V-groove in the said lever
alternately pressing against the under thread in proper co-relationship with the
alternating throws of the double lever. This lever, carrying the V-groove, is
actuated from cams driven from the vertical shaft of the machine or by any suitable
equivalent means.
The oscillating double hook is driven by a pinion on the shaft by which the said
hook is carried, such pinion being actuated by a rack driven from a cam upon the
vertical shaft of the machine.
In order that my said Invention may be properly understood and readily carried
into effect, I will now proceed to describe the drawings hereunto annexed.
Figure 1 is a plan of the underside of a button-hole-stitch sewing machine
constructed according to my present Invention.
Figures 2 to 9 (inclusive) are views of detached portions of the same all herein-
after more particularly described.
In carrying my present Invention into practice, I construct the oscillating hook
or shuttle carrier a, duplex, that is to say, having two points b, and c, as shewn
Each of these points b, and c
more particularly in end elevation at Figure 4.
at alternate oscillations, catches the upper thread and passing it round over itsel

page_text: (the said point) releases it at the proper point, thereby causing the loop, thus
formed, in the upper thread, to pass over the case d, (Figure 1) which, in the
ordinary well-known manner, contain the bobbin on which the under thread is
wound.
I desire here to explain that my present Invention is adapted to button-hole
stitch sewing machines to the needles of which a zig-zag motion is imparted, that
is to say, wherein the needle at one stroke descends through the button-hole and,
at the next stroke, descends through the cloth, surrounding. such button-hole
and so on alternately. The oscillations of the double pointed hook hereinbefore
described are so arranged that one of its points, say, the point b, catches, the loop
of the upper thread when it descends through the slit of the button hole, and the
point c, catches the loop of the upper thread when the needle descends through the
cloth surrounding the button-hole.
In order to main the bobbin and its case d, in the cuplike hollow e, formed in
the double-pointed oscillating hook a, I provide the bar f, which is preferably
round and which is so mounted in or upon the pin or pivot 'g, as to be capable of
being turned from the position in which it is shewn in dotted lines at Figures 2,
and 4, to the position in which it is there represented in full lines. In either
of these positions the bar f; is retained with sufficient frictional resistance by the
spring h, (Figure 1) which presses the pin i, into a groove formed diametrically
across the end or face of the socket j, in which the pivot g, is carried. When the
bar f, is in the position in which it is represented at Figure 1, and in dotted lines.
at Figures 2, 3 and 4, the said bar f, extends across the face of the bobbin case d,.
and thereby retains it within the cup-like hollow of the double-pointed oscillating
hook a, and when it is desired to remove the bobbin and bobbin case d, from the
hook a, the bar f, is pivoted over into the position in which it is represented in
full lines at Figure 2.
The oscillating motion imparted to the double-pointed hook a, is obtained in the
ordinary well known manner, that is to say, by means of the cam groove k,
(Figure 1) formed in the disc l, which is secured to the lower end of the vertical
shaft m. The bowl upon the end of one arm of the bell-crank lever n, engages
with the cam groove k, the other arm being pivoted to the bar o.
At the upper
side of the opposite end of the bar o, there is formed a toothed rack which engages
with the toothed pinion p, (Figures 2 and 3) secured upon one end of the shaft
at the opposite end of which the double-pointed hook a, is rigidly carried. The
shaft q, is mounted in the bracket or supporting frame ?, on, or, as a part of
which the beforementioned socket j, is formed, the said bracket or supporting
frame r, being secured in position against the underside of the machine bed-plate s,
by the screws t, and pins u.
In order to properly direct and tighten the under thread I employ the lever v,
which is shewn detached from the machine at Figures 7, 8 and 9, respectively in
plan, side elevation and in end elevation. This lever v, as shewn more particularly
at Figure 8, is set or bent upwards so as to work close against the underside of the
machine cloth plate, and, as represented at Figure 7, one edge of the said lever v,
is, formed with the V-shaped recess w. The lever v, is pivoted by the screw x, to
the underside of the bed plate 8, and the said lever has the projection y, and pin z,
rigidly secured to its underside. The pin z, is engaged with by one end of the
spiral spring a¹, (Figure 1) the opposite end of which engages with the pin b²,
rigidly secured into the underside of the bed plate 8. The recess c¹, formed in the
side of the projection y, is, by the tension of the spring a¹, drawn upon one end of
the rod d', (Figure 1) the opposite end of which is pressed into a recess formed in
the side of the lever e¹. The pressure of the spring a¹, is, in the manner hereinlast
described transmitted to the lever e', which is pivoted at f¹, to the machine bed
plate, and the bowl g¹, of which is thereby maintained always in contact with the
edge of the cam disc l. This said edge is formed with the cam surfaces or projec-
tions ', which impart, through the lever e¹, and rod d, the necessary motion to
the lever v, the two positions of which and of the lever e¹, and the respective

page_text: position of the cam disc l,, are shewn respectively in dotted and in full lines at
Figure 1 of the annexed drawings.
'
...pt.
The inclined sides or edges of the recess w, (Figure 7) serve to push or correct
the under thread to a position clear, or outside of the path of the hooks b, and c,
and to tighten it by virtue of the sides of the said V-groove alternately pressing
against the under thread in proper co-relationship with the alternating throws of
the double or bell-crank lever n.
Having now particularly described and ascertained the nature of my Inven-
tion and in what manner the same is to be performed, I declare that what
I claim is
First This general arrangement and combination of parts constituting the
improvements in button-hole-stitch sewing machines substantially as and operating
in the manner and for the purposes herein before set forth with reference to the
annexed drawings.
Second-The improvements in button-hole-stitch sewing machines consisting of
the oscillating bobbin case carrier a, constructed with two points b, and c, all
substantially as and operating in the manner and for the purposes hereinbefore set
forth with reference more particularly to Figures 1 to 6 (inclusive) of the annexed
drawings.
Third The improvements in button-hole-stitch sewing machines consisting of
the pivoted lever v, formed with the V-shaped recess w, and to which motion is
imparted by the cams h¹, acting upon the lever e', all substantially as and operating
in the manner and for the purposes hereinbefore set forth with reference more
particularly to Figures 1, 7, 8, and 9 of the annexed drawings or the mechanical
equivalents of all or any of the parts thereof.