Improvements in Sewing Machines.
Year: 1891

page_text: Date of Application, 7th Sept., 1891
Complete Specification Left, 7th June, 1892-Accepted, 16th July, 1892
TRUVIDIONAL DELICATION.
Improvements in Sewing Machines.
We FREDERICK JAMES WILSON, Tailor's Cutter and THOMAS ARCHER
LANSDELL, Merchant Tailor, both of 37 Falcon Road, Clapham Junction, in the
County of Surrey do hereby declare the nature of this invention to be as
follows:-
27
This invention relates to that type of sewing machine known as "two reel
machines in which an ordinary wooden reel of cotton is employed for the under
thread instead of a spool or shuttle. By the use of this form of machine the
necessity of frequently rewinding the spools or shuttles is entirely obviated, and the
operator is enabled to use the machine uninterruptedly, thereby saving much time
besides cotton, a certain length of which is wasted each time a fresh spool or
shuttle is inserted.
In carrying this invention into effect a circular race is secured to the underside
of the needle plate immediately under the needle. A rotating hook is arranged to
travel in the said circular race, and is formed at the end of a case for containing
the reel carrying the cotton for the under thread. Means are provided for securing
the said reel free to rotate within the said case which is provided with an adjustable
spring tension plate through an eye in which the thread passes out of the case.
The said case and hook are given a reciprocating rotary motion of about three
quarters of a revolution so that the point of the hook enters the loop of the upper
thread and draws it down until the said hook occupies its lowest position. Then
owing to the shape of the reel case. the said loop slips upwards over it drawing
with it the lower thread projecting from the said case. After this the hook and
case are returned to meet the needle at its next downward movement to make a
fresh loop around the lower thread.
11001
CASTLE SMITH,
"Invention " Office, 54, Fleet Street, London, E.C.,
Agent for the Applicant.
No text detected.

page_text: containing the reel carrying the cotton for the underthread. Means are provided
for securing the said reel free to rotate within its said case which is provided with
an adjustable spring tension plate through an eye in which the thread passes out of
the case. The said case and hook are given a reciprocating rotary motion of about
three-quarters of a revolution so that the point of the hook enters the loop of the
upper thread and draws it down until the said hook occupies its lowest position.
Then, owing to the shape of the reel case, the said loop slips upwards over it
drawing with it the lower thread projecting from the same thread case.
After this
the hook and case are returned to meet the needle at its next downward movement,
to make a fresh loop around the lower thread.
And in order that our invention may be more fully understood and carried into
practical effect, we will now proceed to describe the same with reference to the
accompanying drawings in which similar letters indicate corresponding parts in all
the figures.
Figure 1 is an end elevation of a portion of a sewing-machine constructed
according to this invention with the rotary hook just about to enter the loop of the
upper thread, and
Figure 2 is a similar view of the same part but with the hook at about its other
extreme position and with the loop of the upper thread shewn slipping upwards to
carry with it the lower thread.
Figure 3 is a partial sectional elevation taken at right angles to the views shewn
at Figures 1 and 2,
Figure 4 is a section taken through a portion of Figure 3 and on an enlarged
scate, and
Figure 5 is a detached view of the reel-retaining device.
The circular race a is attached to the underside of the cloth plateb immediately
under the needle c. The rotatory reciprocating hook d is arranged to travel in the
race a and is formed at the end of the ease e for containing the reel (Figure 4)
carrying the cotton for the under thread. As shewn at Figure 4 this reel fis
mounted free to rotate upon the tubular stud g arranged within the cavity of the
case e which is provided with a cap h having a central extension; fitting within the
tubular stud g and having its free end split and opened out so as to bear against
the inside of the tubular stud g. By means of the grip of the spring; on the
tubular stud g the reel is prevented from leaving the case e, as will be well
understood.
An opening is made at the inner end of the cavity of the case e to admit of the
point of a pair of scissors or other convenient article being inserted to press the
reel, and with it the cap h, out when it is desired to insert a fresh one.
A spring tension plate l, Figures 1 and 2, is arranged at the mouth of the cavity
of the reel case e and is provided with a set screw m by means of which the tension
on the lower thread may be adjusted. The said lower thread n passes through an
eye pin the tension plate l, such eye being formed at the end of a slot passing to
the inside edge of the plate and through which the thread is admitted to the eye.
The eye is situated at or near to the centre about which the hook d and case e
rotate. The reel case e is held against the inner side of the race a by the arms of
a bifurcated carrier q secured to the end of a rocking shaft which is actuated by
any suitable mechanism to give the carrier e and hook d a rotary reciprocating
motion having a certain definite relation to the movement of the needle c.
On the descent of the needle e as shewn at Figure 1 the hook d approaches it
and enters the loop of the upper thread passing through the eye of the said needle.
On the further movement of the machine the book passes through the loop until
the angles formed by the junction of the hook d with the case e arrives at the said
loop which is then carried round with the case. On the parts assuming the position
shewn in Figure 2 the then lower side of the case e lies at such an angle to the
line of the loop of the upper thread that such loop slips upwards off the case,
which has all its corners rounded off and is otherwise suitably shaped to allow of
the loop slipping off it. It will be readily understood that the loop passes
t

page_text: between the arm of the carrier 9 and the case e. The movement of the case a
brings the loopt of the upper thread below the projecting end n of the lower
thread, as reference to Figures 1 and 2 will shew, so that in its upward movement
the loopt carries with it the under thread n to the centre of the fabric being sewn.
The hook d and case e are then returned to meet the needle c on its next downward
movement to make a fresh loop around the lower thread. The slack in the upper
thread is taken up by a vibrating lever in the ordinary manner.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare what we
claim is :-
(1) The use in a two-reel lockstitch sewing-machine, such as is herein described,
of an ordinary reel holding the cotton for the lower thread which is placed within
a case attached to the rotatory-reciprocating hook for forming the loop in the upper
thread, substantially as and for the purpose herein set forth and shewn in the
accompanying drawings.
(2) In a two-reel lockstitch sewing-machine, such as is herein described, the
combination of the case e for containing an ordinary reel of cotton with the rotatory-
reciprocating hook d, substantially as and for the purpose herein set forth and
shewn in the accompanying drawings.
(3) In a two-reel lockstitch sewing-machine, such as is herein described, the
placing of the orifice by which the lower thread passes out of the case & at or
near to the centre about which the hook d and case e rotate substantially as and
for the purpose herein set forth and shewn in the accompanying drawings.
(4) In a two-reel lockstitch sewing-machine, such as is herein described, the
placing of the reel holding the cotton for the lower thread and its case e
immediately below the needle c and in a direct line therewith, substantially as and
for the purpose herein set forth and shewn in the accompanying drawings.
(5) The construction of a two-reel lockstitch sewing-machine substantially as
and for the purpose herein set forth and shewn in the accompanying drawings.
Dated this 7th day of June 1829
CASTLE SMITH,
"Invention " Office, 54, Fleet Street, London, E.C.,
Agent for the Applicants.