Year: 1886

page_text: Date of Application, 13th Nov., 1886.
Specification Accepted, 11th Jan., 1887.
I JOSEPH THOMAS of 195 High Holborn in the county of Middlesex Appraiser 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 certain improvements in lock stitch sowing machines
the object being to lesson the cost of manufacture and to produce a machine
that shall be simple and efficient with the great advantage of making the lock stitch
direct from two reels of cotton.
In carrying out this invention there will be attached or cast to the bottom of the
bed plate of the machine a tubular bracket piece for receiving and holding the carrier
containing the reel of cotton. The loop from the top thread will be passed over the
said reel carrier by means of a small hook or loop taker attached to the free end of a
rocking lever bar. This rocking lever bar is fulcrumed by means of a ball formed
upon it working in a bearing projecting from the bottom of the bed plate. The
other ond of this bar is attached by means of a hinge to a pitman worked eccentrically
from the main driving shaft of the machine.
The rocking lever bar is operated by these means in a novel manner and receives a
variable motion, the loop taker end being made to travel around the reel carrier the
said end in its travel describing an oval.
In order that my invention may be readily understood I have hereunto annexed
two sheets of drawings illustrative thereof:
In sheet 1 Fig. 1 is a side view of a machine with my invention applied.
Fig. 2 is an underneath view.
Fig. 3 shows face view of pitman.
Figs. 4 and 5 show inside and under view the reel carrier on enlarged scale.
Fig. 6 is side view of loop taker also on enlarged scale.
I will now describe the construction of a machine according to this invention in
reference to sheet 1 of the drawings, a is a tubular bracket piece bolted to the
underside of the bed plate and contains the carrier a' for the under reel of thread ; the
carrior a will be kept in position by means of the swell a' which fits loosely into the
cut out portion of the bracket picce a (see Fig. 2).

page_text: The reel of cotton will revolve within the said carrier and be kept therein by the
spring piece a. The reel carrier is shown in Fig. 4 and 5. with one end open the
opposite end being rounded off and formed wedge shape lacing holes or any of the
well known means may be used for giving the requisito tension to the under thread.
bis the rocking lever bar upon which is formed the ball or swell 61 working in
the bearing b² fixed to the bed plate. Upon the outer end of bar bis the small hook or
loop takere formed to enter and take the loop from the needle thread and having on its
inner side the small stop c² similar to a fish or crochet hook (see Figs. 2 and 6).
The rocking bar bis attached to the pitman d by means of the hinge d³, said hinge
being for the purpose of allowing sidewise play to the end of the rocking bar
attached to it.
In the face of the pitman there is the slot working upon the pin or stud e fixed
to the pedestal g of the over hanging arm of the machine.
The stud or pin e acts as a centre or fulcrum to throw the pitman d out of line that
is to say when the machine is driven the eccentric will rise, but the pin acts
against one side of the slot d' in the pitman and throws the bottom end outwards and
with it the hinged end of the lever bar b so causing the loop taker end to travel
forward the length of the carrier taking with it the loop from the needle thread.
The pitman now rises and the loop taker end of bar bis depressed the depth of the
reel carrier and as the machine travels the pitman is again thrown outwards (in the
opposite direction to that just before mentioned) and then downwards thus causing
the loop taker to. traverse under and then up the end of reel carrier a¹ having
completed its traverse around endwise of the reel carrier. The loop taker is shown in
Fig. 1 as just about to take the loop and in Fig. 2 it is shown as having taken the
loop and completed half its traverse around the reel carrier.
The loop taker end of the lever bar 6 will receive an accelerated motion at the time
when it takes the loop by reason of the leverage of the pitman being at this time at
the top end of the slot d³ (Fig. 1).
•
In sheet 2 of the drawings is illustrated another method of carrying out my
invention and according to this I cast the overhanging arm, the tubular bracket
picco a and the projection hall in one with the bed plate. There will also bo a rib
cast upon
the underside of tho bed plate running along the centre for the purpose of
strengthening the plate and this will also serve to keep the machine in its proper
position on the stand.
In the projection there will be a hole tapped into which will take the screw of the
bearing piece h' (shown on enlarged scale Figs. 4 & 5). This bearing piece h¹ will
be capable of turning freely upon the screw thread to accomodate the sidewise play of
the bar band has a jaw for receiving a flattened part of the bar b (this will take the
place of the ball fulcrum before described) and instead of having the end of bar b
hinged to the pitman there will be formed upon its end a ball which will work in the
parallel hole i of the pitman shown in Fig. 1 and 2. Upon the pedestal of the over-
hanging arm there is attached or cast the bracket piece k having the pin / standing out
at right angles therefrom for receiving the collar m of the swinging arm n (shown in
plan Fig. 3) said arm n at its outer end being attached to the pitman by means of the
pin o passing therethrough. This swinging arm n will take the place of the stude
before described in the description of sheet 1 for throwing the pitman out of line.
The operation of these parts will be the same as that of the parts described in reference
to sheet 1.
-
According to a modification of the loop taker (shown in Figs. 6 7. & 8) thero will
be a piece cut out of the hind portion in which will be placed a small wheel p having
a Vee groove which will work upon the vee edge s formed on the underneath recl
carrier a, shown in Fig. 9. This small wheel is for the purpose of lifting the real
carrier and preventing friction on the loop of cotton whilst passing between the
underside of the carrier a¹ and the tubular bracket piece a.
The loop taker is shown in sheet 2 of the drawings as having two stops of the
second one being for the purpose of stopping the loop coming in contact with the
wheel p.

page_text: It is to be noted that the loop taker will always have its point in the same direction
as will be seen in reference to the diagram Fig. 9, which shows the reel carrier, and
the hook at four different stages of its traverse around the said carrier.
The operation of a machine according to this invention will be as follows.
We will assume that the needle has penetrated through the material to be stitched
and having reached its lowest point has risen a short distance so forming a loop of
thread, at this moment the point of the loop taker enters the loop and moving at an
accelerated speed (by reason of the variable motion imparted to it by the pitman)
carries with it the said loop.
c¹
The loop will be caught upon the back part or shoulder of the loop taker, or as in
sheet 2 against the back stop e' during the first part of the traverso (as will be seen
at 1 and 2 in the diagram Fig. 9) and during the second half will be caught by the
fish or crochet hook stop c' (shown at 3 & 4 diagram Fig. 9 sheet 2). By these
means the loop of thread from the needle will be brought around the reel carrier and-
when the loop taker draws the next following loop over the carrier the slack of the
first loop will be drawn up and embracing the thread from the under reel the stitch
will be completed.
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 :-
Firstly. The loop taker c with stop c' attached to the free end of lever bar b for
carrying the loop of thread from the needle around endwiso of the reel carrior as
herein described and shown in sheet 1 of the drawings.
Secondly. The rocking lever bar b fulcrumed on the ball 6' in boaring 63 in
combination with the eccentric pitman d constructed and operating as herein described
and shown in Figs. 1 and 2 sheet 1 of the drawings.
Thirdly. The tubular bracket piece a and carrier a' for holding the under real
of cotton substantially as herein described and shown.
Fourthly. The rocking lever bar 6 fulcrumed in bearing pieco h¹ and connected to
the pitman d by means of the ball working in the holo i, the whole constructed and
operating as herein described in reference to shoot 2 of the drawings.
Fifthly. The loop taker c with stops c' c' and small wheel p in combination with the
real carrier a' as shown in Fig. 9 sheet 2 of the drawings.
JUDER HUMAN,
195, High Holborn, W.C.