Year: 1885

page_text: I MARLBOROUGH ROBERT PRYOR of Weston Stevenage in the County of Herts
Merchant do hereby declare the nature of this invention (à communication to me
from abroad by Mess Parrott and Company of' San Francisco United States of
America Merchants) to be as follows:—
C
.. 1
This invention has for its object improvements in sewing machines and the
improvements relate to the mode of taking up the under thread of a looper worked
to and fro by a crank as shown in the drawing annexed.
This is effected by sliding the thread along a steel piece B shown in the drawing
and by the movement of the looper a
Figure 1 represents the looper a going towards the straight needle d—in this
position the thread c is loose.
Figure 2 represents the looper a having gone through the loop of the upper
needle-the upper needle at this time has raised out of the plate, the thread c is
now drawn tight.
Figure 3 represents the looper a having come half way back, in this position the
thread is drawn tight.
The operation of the machine is as follows, the looper moves from the position in
Figure 1 to the position in Figure 2 that is from g to g when it reaches the position
in Figure 2 the under thread will be tight, it will then move to the position of
Figure 3.. Now in moving from No 2 to N° 3 the thread from d to g, would be
alack if not taken up by drawing the thread under the steel piece B from g to H
if the thread was not taken up at this point it would be slack from d to g
Figure 2 and cause the machine to drop a stitch-as the looper moves back to its
original position Figure 1 the thread is slack allowing it to be drawn up close to
the goods.
Dad thin th
Jahon 100K

page_text: Improvements in sewing macmmes,
I MARLBOROUGH ROBERT PRYOR of Weston Stevenage in the County of Herts
Merchant do hereby declare the nature of this invention (a communication to me
from abroad by Messrs Parrott and Company of San Francisco United States of
America Merchants) and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement:―
This Invention has for its object improvements in sewing machines and the
improvements relate to the mode of taking up the under thread of a looper worked
to and fro by a crank. This is effected by providing a stationary guide for the
thread along which the thread is caused to slide by the movement of the looper.
Figure 1 is a side elevation partly in section of a portion of a sewing machine
arranged in accordance with my invention and shows the looper and the crank also
the table of the machine, the upper needle and the guide for the looper. The
thread guide is also shown in this figure.
Figure 2 is a front view of the looper.
Figure 3 is a plan of the guide for the looper.
Figure 4 is a plan of the thread guide.
Figures 5. 6 and 7 are diagrams illustrating the movement of the looper and
show successive positions of the looper needle as seen in plan.
a is the table of the machine b is the upper needle which rises and falls through
an eye or aperture in the table. This needle receives its motion in any convenient
manner and it is threaded with the upper sewing thread. c is the looper and d is
the axis on which is the crank actuating the looper. The crank is formed by
cutting a ring groove in the boss upon the axis. The crank is oblique and it is
embraced by the looper which at the lower part is divided and the two parts are
held together by screws.
The motion which the crank imparts to the looper needle c¹ is complex, the
looper being further controlled by the guide e, which is fixed beneath the table.
In this guide a block c³ traverses to and fro in a rectilinear direction and this
block is connected with an arm of the looper by a central pivot or pin.. f is the
lower sewing thread it passes from a spool anywhere conveniently placed over the
stationary thread guide g, and along the looper needle c¹ to its eye and so to
the work. The arrow h indicates the direction in which the work is carried
forward stitch by stitch. The upper needle b simply takes its thread down in
loops through the fabric upon the table and the looper passes its needle through
the loops of the upper needle thread and produces with its thread a tambour like
chain; a stitch which is very commonly produced in sewing machines.
In Figure 5 the looper needle c¹ is seen advancing towards the upper needle b
and immediately afterwards the point of the looper needle passes through the loop
of the upper needle thread. The thread f at this time is loose.
By the time the looper needle reaches the position shown by Figure 6 the upper
needle b has risen and the thread / has been drawn tight by the advance of the
looper needle. The looper needle now retires and as it does so it inclines away
from the thread guide g and the lower thread f being looped around this guide is
drawn tight

page_text: By the time the parts have reached the position indicated by Figure 7 the upper
needle has descended through the loop of the looper needle which is so held in
place and there is no risk of the stitch being dropped.
The lower thread is kept tight by the thread guide g up to the moment when
the looper needle again commences to advance or nearly so.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that
what I claim is :-
1. In a sewing machine working with an upper and under thread the com-
bination consisting of the looper carrying the under thread and moving substantially
as described and the thread guide g drawing this under thread tight as the thread
is carried along the guide by the movement of the looper.
2. My improvements in sewing machines substantially as described.
Dated this third day of July 1886.
M. R. PRYOR.
Carpmael & Co.,
Agents for the Applicant.