IMPROVEMENTS IN SEWING MACHINES
Year: 1881

page_text: LETTERS PATENT to John Imray, of No. 28, Southampton Buildings, Chancery
Lane, in the County of Middlesex, for an Invention of "IMPROVEMENTS IN
SEWING MACHINES." A communication from abroad by Heinrich Buckofzer,
of Berlin, in the German Empire.
PROVISIONAL SPECIFICATION left by the said John Imray at the Office
of the Commissioners of Patents on the 20th May 1881.
JOHN IMRAY, of No. 28, Southampton Buildings, Chancery Lane, in the County
of Middlesex. "IMPROVEMENTS IN SEWING MACHINES." [A communication from
abroad by Heinrich Buckofzer, of Berlin, in the German Empire.]
This Invention relates to an improved construction of sewing machines whereby
two rows of stitching are formed simultaneously by two needles, of which one is
adjustible to or from the other, so as to produce the rows of stitching at any desired
distance apart.
For this purpose the machine (which I will assume to be a chain stitch machine,
but which may also be arranged to produce other kinds of stitching) is constructed
as follows:-The driving pulley of the machine imparts motion to a spur wheel in
gear with two pinions on two looper shafts, arranged side by side, one of which
shafts is capable of sliding longitudinally through its pinion to which it is geared
by a groove and feather, the pinion being held in position by being provided with
two side flanges or cheeks by which it embraces the driving wheel. The other
shaft has a crank or eccentric by which it imparts the necessary rocking motion to
the needle arm, which imparts an up and down motion to two needle bars that are
connected by a pin so as to move simultaneously. The one of these needle bars
operates with its needle in combination with its looper shaft, feed motion, and
presser foot in the usual manner. The second needle arm carries a bracket which
is a horizontal slide carrying at one end the second needle and at the other end an
adjusting screw by means of which the slide and with it the needle can be moved
relatively to the needle bar, so as to bring its needle nearer to or farther from the
first needle. A setting screw secures the slide when it has been adjusted to the
desired position. Each needle has a separate needle plate, of which the one for the
Pics 1

page_text: adjustable needle is also made adjustable in a corresponding manner, for which
purpose it is held by two pinching screws passing through slotted holes. The
underside of this needle plate has a fork or loop embracing a collar on the sliding
looper shaft, so that on sliding the needle plate in order to bring it into a position
corresponding to that into which the needle has been moved, it at the same time
slides the looper shaft longitudinally so as also to bring the looper thereof into the
proper position relative to the said needle. The feed motion bar (which receives
its motion from a crank pin on the first mentioned looper shaft) has two serrated
feed plates, one for each needle; the one for the adjustable needle is carried by a
bar capable of sliding transversely in the feed motion bar, so as to be adjusted in
position relatively to its needle, and this adjustment is also effected on moving the
needlo plate, the sliding bar being held by a setting screw when the adjustinent
has been effected. The presser bar also carries two presser feet, one of which is
adjustable. For this purpose the presser bar carries a bracket having a horizontal
slot in which is a slide carrying the adjustable presser foot, and held by a setting
screw when adjusted into position.
The above construction of sewing machine is more particularly applicable for
sewing pleatings, kiltings, or ruchings, and may be used in combination with any
known construction of apparatus for producing these fabrics.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said John Imray in the Great Seal Patent Office on the 16th November
1881.
JOHN IMRAY, of No. 28, Southampton Buildings, Chancery Lane, in the County
of Middlesex. "IMPROVEMENTS IN SEWING MACHINES." A communication from
abroad by Heinrich Bukofzer, of Berlin, in the German Empire.
This Invention relates to an improved construction of sewing machines whereby
two rows of stitching are formed simultaneously by two needles, of which one is
adjustable to or from the other, so as to produce the rows of stitching at any
desired distance apart.
For this purpose the machine (which I will assume to be a chain stitch machine,
but which may also be arranged to produce other kinds of stitching) is constructed
as follows: The driving pulley of the machine imparts motion to a spur wheel in
gear with two pinions on two looper shafts arranged side by side, one of which
shafts is capable of sliding longitudinally through its pinion to which it is geared
by a groove and feather, the pinion being held in position by being provided with
two side flanges or cheeks by which it embraces the driving wheel. The other
shaft has a crank or eccentric by which it imparts the necessary rocking motion to
the needle arm, which imparts an up and down motion to two needle bars, that are
connected by a pin so as to move simultaneously. The one of these needle bars
operates with its needle in combination with its looper shaft, feed motion, and

page_text: presser foot in the usual manner. The second needle arın carries a bracket on which
is a horizontal slide, carrying at one end the second needle and at the other end an
adjusting screw, by means of which the slide and with it the needle, can be moved
relatively to the needle bar, so as to bring its needle nearer to or farther from the
first needle. A setting screw secures the slide when it has been adjusted to the
desired position. Each needle has a separate needle plate, of which the one for the
adjustable needle is also made adjustable in a corresponding manner, for which
purpose it is held by two pinching screws passing through slotted holes. The
underside of this needle plate has a fork or loop embracing a collar on the sliding
looper shaft, so that on sliding the needle plate in order to bring it into a position
corresponding to that into which the needle has been moved, it at the same time
slides the looper shaft longitudinally so as to bring the looper thereof into the
proper position relative to the said needle. The feed notion bar (which receives
its motion from a crank pin on the first mentioned looper shaft) has two serrated
feed plates, one for each needle; the one for the adjustable needle is carried by a
bar capable of sliding transversely in the feed motion bar, so as to be adjusted in
position relatively to its needle, and this adjustment is also effected on moving the
needle plate, the sliding bar being held by a setting screw when the adjustment
has been effected. The presser bar also carries two presser feet, one of which is
adjustable. For this purpose the presser bar carries a bracket having a horizontal
slot, in which is a slide carrying the adjustable presser foot, and held by a setting
screw when adjusted into position.
The above construction of sewing machine is more particularly applicable for
sewing pleatings, kiltings, or ruchings, and may be used in combination with any
Fig. 1 of the accompanying Drawing shews a side elevation of a sewing machine
with the above described improvements applied thereto. Fig. 2 shews a front view;
Fig. 3, a sectional plan on line A, B, C, D, Fig. 1; Fig. 4, a cross section on line
E, F, Fig. 3; Figs. 5 and 6 shew two views of the head or bracket K, with slide L;
Figs. 7, 8, and 9, shew three views of the slotted bracket A on the presser bar d
with the two presser feet D₁, D.; Figs. 10, 11, and 12, shew three views of the
feeder o₂, connected to the slide v, and capable of being adjusted on the feed
bar S, and fixed by the screw s. The frame G carries a fixed stud or pin a, on
which are mounted the pulleys, with spur wheel fixed thereto, which latter
gears with the two pinions ₁, ₂, on the looper shafts g, and g.. The pinion is
fixed on g., while g, is connected to r, by a groove and feather, so that is free to
slide through, which is held in gear with the wheel by means of two cheeks,
01, 0, embracing the sides of the latter. The shaft g has a crank at b, by means
of which motion is imparted to the needles, and at its front end it has an eccentric
enlargement c, by which the motion is imparted to the feed bar S. The needles
are actuated simultaneously by the lever H, connected to the pin e of the needle
bars by its slotted end, and receiving its motion from the crank b of the shaft g:
through the connecting rod p. The two needle bars n₁, n, are connected together
by the pin e passing through them. The bar n, is of usual construction, but ne
carries a bracket K, on which is a slide L secured by a screw s, and serving as
needle holder, the needle being secured thereto by means of the screw 8.
needle No, held by the slide, can be moved nearer to or farther, from the second
needle N', by adjusting the slide L by means of the screw w; after adjustment the
slide is fixed by means of the screw s. For adjusting the presser foot D³ of the
needle N, in a corresponding manner to the latter, the lower end of the presser
bar d is provided with a slotted bracket M. carrying the presser foot D, adjustable
therein, and fixed by the setting screw t; the bracket also carries the fixed presser
foot D. The turning of the presser bar is prevented by the prismatic guide q and
૧
The

page_text: setting screw u. The needle plate consists of the two parts P and P., of which
the first is attached to the framing, while P₁ is so connected that it can be moved
in the direction of the looper shafts in a corresponding manner to the adjustment
of the needle N₁; for effecting such adjustment of the plate, the screws x and y
have to be loosened. By the movement of the plate P., the lopper shaft g, is also
moved, the latter being connected to the former by a fork Q on the plate embracing
a collar 8, on the shaft. The movement of the plate P, also effects the adjustment
of the feeder o₁, the screw z being loosened to allow of this. The feeder
01 is fixed
to the feed bar S, while o, is carried by the slide sliding in S, and fixed by
screw 2.
2
Having thus described the nature of this Invention and in what manner the
same is to be performed as communicated to me by my foreign correspondent,
I claim,
First. The use of the herein described mechanism for adjusting the one needle,
consisting of the slide L secured by setting screw w on the bracket K carried by
the needle bar.
Second. The use of the herein described adjustable presser mechanism, consisting
of the slotted bar M, with the moveable presser foot D and fixed presser foot D¹
Third. Arranging the part P2 of the needle plate adjustable, and securing the
same by means of the screws x and y, for the purposes herein set forth.
Fourth. The combination with the adjustable needle plate P, of the fork Q
operating with the collar S, for the adjustment of the one looper bar, as herein
described.
Fifth. Arranging the one looper shaft g, adjustable longitudinally, its driving
pinion, being kept in gear with the driving wheel, substantially as described.
Sixth. The combination of the adjustable feeder o₂ with the slide v and screw Z.
In witness whereof, I, the said John Imray, have hereunto set my hand
and seal, this Sixteenth day of November, in the year of our Lord One
thousand eight hundred and eighty-one.