Improvements in Lock and Chain Stitch Sewing Machines.
Year: 1892

page_text: Date of Application, 14th Apr., 1892
Complete Specification Left. 14th Jan., 1893-Accepted, 25th Feb., 1893
PROVISIONAL SPECIFICATION.
Improvements in Lock and Chain Stitch Sewing Machines.
1, EDWARD KOHLER of 97 Cheapside in the City of London, Engineer, do
hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in the sewing machine described in the
Specification of Patent granted to the present applicant Edward Kohler, and
bearing date the 27th day of May 1890, No. 8231.
In the said Specification, a reciprocating forked loop holder is described, the
office of which is to take the loop from the shuttle and hold it open in the path of
the needle at its next descent, whereby, in a lock stitch sewing machine, a chain
stitch may also be produced at will.
The said loop holder received, in addition to the reciprocating motion, an
oscillating motion, such motion being caused, in one direction, by a fixed cam piece,
and in the opposite direction by a spring.
In the same Specification, the production of a third stitch, namely, an embroidery
stitch, or a lock stitch and a chain stitch combined, is mentioned.
It has been found, in practice, that this embroidery stitch is somewhat irregular
in appearance, the shuttle thread being sometimes on one side of the loop, and
sometimes on the other.
Now, the object of the present invention is to provide for the oscillation of the
loop holder by direct means, and to ensure the regularity of the embroidery stitch.
In carrying out this invention, the forked loop-holder is provided with a hooked
extension, the hook of which takes onto a bowle carried by the feed-dog actuating
mechanism, so as to bring the loop holder on one side of the needle to enter the
loop.
The means which are provided to ensure the regularity of the stitch, may consist
of a hooked finger mounted on a vertical rocking axle, to which motion may be
communicated in any convenient manner, for instance, a pin on a reciprocating rod
or bar taking into a slotted curved arm keyed to the rocking axle, the said rod
being connected with driving mechanism of the loop holder by which it is
reciprocated.
The office of this hooked finger is to seize the shuttle thread as the shuttle
advances, and hold it to one side of the loop out of the path of fork of the loop
holder, when the latter advances and enters the loop of the needle thread, as it
slips off the heel of the shuttle.
Dated this 14th day of Anril 1892.
NEWTON & SON,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Lock and Chain Stitch Sewing Machines.
I, EDWARD KOHLER¡ of 97 Cheapside in the City of London, Engineer, 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 improvements in the sewing machine described in the
Specification of Patent granted to me, and bearing date the 27th day of May 1890,
No. 8231.
In the said Specification, a reciprocating forked loop holder is described, the

page_text: office of which is to take the loop from the shuttle, and hold it open in the path of
the needle at its next descent, whereby, in a lock-stitch sewing machine, a chain-
stitch may also be produced, at will.
The said loop holder received, in addition to the reciprocating motion, an
oscillating motion, such motion being caused, in one direction, by a fixed cam piece,
and in the opposite direction by a spring.
In the same Specification, the production of a third stitch, namely, an embroidery
stitch, or a lock stitch and a chain stitch combined, is mentioned.
It has been found, in practice, that this embroidery stitch is liable to be some-
what irregular in appearance, the shuttle thread being sometimes on one side of the
loop, and sometimes on the other.
Now, the objects of the present invention are to provide for the oscillation of the
loop holder by direct means, and also to ensure the regularity of the embroidery
stitch.
In carrying out this invention, the forked loop holder is provided, on one side,
with a hooked extension, the hook of which takes onto a bowle carried by the
feed-dog actuating mechanism, and on the other side an inclined finger, which
strikes a fixed point, so that the loop holder is brought to one side of the needle, to
enter the loop, and is moved laterally to bring the loop into position to receive
the needle at its next descent.
The means which are provided to ensure the regularity of the stitch, may consist
of a hooked finger mounted on a vertical rocking axle, to which motion may be com-
municated in any convenient manner; for instance, by a pin on a reciprocating rod
or bar, taking into a slotted curved arm keyed to the rocking axle, the said rod being
connected with driving mechanism of the loop holder, by which it is reciprocated.
The office of this hooked finger is to seize the shuttle thread as the shuttle
advances, and hold it to one side of the loop, out of the path of the fork of the loop
holder, when the latter advances and enters the loop of the needle thread, as it
slips off the heel of the shuttle, when making the combined lock and chain or
embroidery stitch.
In the accompanying drawings,
Fig. 1 is an under side plan view of a shuttle machine, with the present invention
adapted thereto.
Figs. 2, 3, 4, 5 and 6 are plan views, with the covering plate removed, and
showing the parts in five different positions during the making of a stitch.
The machine to which the invention is applied, is what is known as the "German
Singer" machine, with the shuttle working longitudinally of the table.
A is the table of the machine, and B is the shuttle, which is worked in the
usual way. C is the forked loop holder, which receives a reciprocating motion
transversely of the table, from the excentric D on the vertical shaft D', through
the connecting rod a and divided lever b, or in any other convenient manner.
The forked loop holder is provided with an extension piece c, having, at one
side, a hooked portion c, and at the other side an inclined finger or horn c. In
the hooked portion c¹ works a bowle d, carried by the bar E, which actuates the
feed mechanism. d¹ is a second bowle mounted on a stud pin secured to the table
of the machine, and d² is an adjustable abutment piece, against which the nose of
the horn strikes at certain times in the stroke. F is a hook, which is mounted
on the end of a vertical rock shaft G, carried in sleeve or other bearings in the
table. On the lower end of this shaft G is keyed a slotted arm H, in the slot of
which works a pin on the pivotted prolongation a' of the excentric connecting rod a.
As the part a advances and retires, the pin causes the shaft to rock, and thus
Oscillate the hook. This hook is arranged to oscillate above, & just clear of, the
shuttle, but below the forked looper, & its business is to act as a kind of take-up,
to take up the slack of the shuttle thread, as the shuttle is advancing, and hold the
shuttle thread tight, thus keeping it out of the way of the fork while the loop
bolder is entering the loop. In this way, the shuttle thread is always kept on one
side of the loop, and an even stitch is the result.

page_text: In the position shown at Fig. 2, the shuttle has just entered the loop of the
needle thread, the hook F has been rocked to seize the shuttle thread, so as to keep
it tight, while the shuttle advances, and the forked looper C is commencing to
advance on the left side of the needle.
Fig. 3 shews a further development; the shuttle is nearly through the loop; the
hook F is following the movement of the shuttle still keeping the shuttle thread
tight, and the loop holder has advanced so that its right prong has passed under
one side of the loop.
The movement of the holder is in a diagonal direction from left to right, this
movement being caused by the bowl d, which, it will be seen, has moved to the
right with the feed bar E, which carries it.
In Fig. 4, the shuttle has passed through the loop, the hook F still following.
The prongs of the looper have passed entirely to the right hand side of the needle,
and both have entered the loop, the loop having been pushed to one side by the
right prong. The ordinary take-up now begins to operate, and tightens the loop
round the prongs of the looper. At the same time, the looper is advanced until
its arm or finger c' strikes against the bowl d' (see Fig. 5). The continued forward
motion of the looper (by reason of the inclination of the finger c³) causes it to move
to the left, and the point of the finger strikes the fixed stop d'. The fork will
thus have brought the loop into position for the needle to pass through, at its next
descent. At the same time, the hook F will have returned to its farthest limit,
and will have freed itself from the shuttle thread, and the shuttle will have com-
menced its return stroke.
In Fig. 6, the shuttle has nearly completed its return stroke; the hook F is
about to advance again, to seize the shuttle thread; the looper is withdrawing
from the loop; and the feed bar E is in its most forward position.
The parts will of course be timed to work in proper order.
Fig. 7 is a diagram which shews the line of movement of the points of the prongs
of the fork.
The looper may be thrown in or out of action, as occasion may require, by the
means shewn in the Specification of the Patent before referred to, or in any other
convenient manner.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. In a shuttle sewing machine adapted to produce either a lock stitch or a chain
stitch, or a combined lock and chain stitch, the combination with a vertical needle
and a reciprocating shuttle, of a reciprocating and oscillating forked loop holder, a
device for holding the shuttle thread during the formation of the combined stitch,
and means for driving the several parts, all substantially as described, and for the
purpose set forth.
2. In a shuttle sewing machine adapted to produce three kinds of stitches, the
combination with a longitudinally-reciprocating forked loop holder, having a hooked
prolongation, of a feed mechanism comprising a reciprocating bar and a bowl on
said bar, to take into the said hooked prolongation, for producing a lateral move-
ment of the said loop holder, as and for the purpose set forth.
3. In a shuttle sewing machine adapted to produce three kinds of stitches, the
combination with a longitudinally-reciprocating forked loop holder, and a longi-
tudinally reciprocating feed bar driver, of means for oscillating the said holder
laterally during its forward reciprocation, consisting of a hooked prolongation c¹ on
one side of the fork of said holder, an inclined finger or horn on the other side of
said fork, a bowl d on said feed bar driver, and a bowl occupying a fixed position,
all substantially as herein described.
4. A shuttle sewing machine adapted to produce either a lock stitch or a chain
stitch, or a combined lock and chain stitch, having an oscillating hook suitably
driven, to hold the shuttle thread tight, as the shuttle advances, and out of the

page_text: path of the forked looper, when producing the combined stitch, and a forked loop
holder provided with a hooked portion, which takes over a bowle on the feed-dog
actuating mechanism, whereby the oscillation of the loop holder is effected by
direct action, all as and for the purpose set forth.
Dated this 14th day of January 1893.
NEWTON & SON,
Agents for the Applicant.