AN IMPROVED TAKE UP' MECHANISM FOR SEWING MACHINES
Year: 1884

page_text: I GEORGE SAWYER of 19 Queen Victoria Street in the City of London Sewing
Machine Merchant do hereby declare the nature of the said Invention for "AN
IMPROVED TAKE UP' MECHANISM FOR SEWING MACHINES" to be as follows:-
The object of this Invention is an improved "take up" mechanism for sewing
machines in or by which the short end of a lever is operated direct by a cam on
the upper shaft of the machine. The face of the cam is shaped to govern the
varied speed of movement of the lever to take up the slack thread after the shuttle
has passed through the loop.
For the purpose of this Invention on the upper part of the head of a sewing
machine is an arm through which a shaft is passed. A cam is carried on this shaft
and having a small roller riding in its groove so that it rocks to and fro as the can
is rotated. The roller is on a pin carried by the short arm of the take up lever
this being centred or hung from a stud working in an aperture provided for it in
the upper part of the first named arm and is held securely by a screw pin.
The short arm works within a pocket of the other arm, and its lower end and
the cam are enclosed by a shield to keep them from dust and dirt.
The take up lever rises quickly to the top of its stroke by the action of the cam
curve or race being rather sharp for that purpose. The lever then remains at rest.
during the travel of the flat part of the cain, and is then drawn down by the
shallow face of the cam to give off the slack and allow the descent of the needle,
it then lowers suddenly to allow the loop portion of the thread to open out for the
passage of the shuttle and then suddenly rises a short distance to draw up the
thread and then continues to rise to the top of its course with the needle.
Dadad him 5th 3-

page_text: I GEORGE SAWYER of 19 Queen Victoria Street in the City of London Sewing
Machine Merchant, do hereby declare the nature of the said Invention for "AN
IMPROVED TAKE UP' MECHANISM FOR SEWING MACHINES" and in what manner
the same is to be performed to be particularly described and ascertained in and by
the following statement :-
The object of this Invention is an improved take up mechanism for sewing
machines in or by which the short end of a lever is operated direct by a cam on
the upper shaft, the face of the cam being shaped to govern the varied speed of
movement of the lever to take up the slack thread after the shuttle has passed
through the loop.
The Invention is clearly shown in the annexed Drawings.
Figure 1 is a view of part of the head A of a sewing machine through the arm B
of which the shaft C is passed. D is the cam on the shaft C and has a small
roller E riding in its groove so that it rocks to and fro as the cam is rotated. The
roller E is on a pin F carried by the short arm G of the take up lever H this being
centred or hung from a stud working in an aperture provided for it in the upper
part of the arm B and is held securely by the screw pin I.
The short arm G works within a pocket of the arm B and its lower end and the
cam are enclosed by a shield (not shown) to keep them from dust and dirt.
Figure 1 represents the take up lever H at the top of its stroke up to which it
has risen quickly from the position shown at Figure 2 by the action of the cam
curve or race being rather sharp for that purpose. The lever then remains at rest
during the travel of the flat part of the cam as at Figure 1 and is then drawn down
by the shallow face of the cam as at Figure 3 to give off the slack and follow the
descent of the needle, it then lowers suddenly to allow the loop portion of the
thread to open out for the passage of the shuttle and then suddenly rises a short
distance to draw up the thread and then continues to rise to the top of its course
with the needle.
The advantage of governing the action of the take up lever by a cam on the
upper shaft is, its action is positive and so adjusted that all undue strain is
removed from the thread which prevents the usual jumping motion and reinoves
that inequality in the appearance of the stitches so noticeable by existing
arrangement of take up by the action of the needle bar.
Having now particularly described and ascertained the nature of the said
Invention and in what manner the same is to be performed I declare that what
I claim is
•
1. Fitting or arranging a cam D on the upper shaft C of a sewing machine for
governing the action of the take up lever G H as described.
2. I claim suspending the take up lever G, H, from the pin I on the arm B of a
sewing machine and governing its motion by a cam D of the upper shaft as
described and as shown in the annexed Drawings.
H. GARDNER,
Agent for the Applicant.