Manufacturer of Sewing Machines.
Year: 1882

page_text: PROVISIONAL SPECIFICATION left by William Henry Beck at the Office of
the Commissioners of Patents on the 21st November 1882. Communicated
to him from abroad by Alexandre Louis Juste Loubinoux, of 2 Boulevard de
Strasbourg, Paris, in the Republic of France-Manufacturer of Sewing
Machines.
WILLIAM HENRY BECK of 139 Cannon Street in the City of London, Consulting
Engineer and Patent Agent IMPROVEMENTS IN SEWING MACHINES Communicated
to him from abroad by Alexandre Louis Juste Loubinoux, of 2 Boulevard de
Strasbourg, Paris, in the Republic of France Manufacturer of Sewing Machines
These improvements consist in a modification of the thread drawing lever
whereby an entire change is effected in the working of the sewing machine by the
uniform regulation of the traction and distribution of the thread as required and
the entire prevention of breakage of the thread whatever the kind of work may be
that the machine is operating upon.
"
As in machines constructed on what is known as the Whitt" principle the
thread drawing lever is connected with the needle bar by a small connecting link
and is centred on an adjustable supporting piece the adjusting screws of which pass
through elongated slots which allow of its being placed higher or lower so as to
regulate the delivery of thread.
But what distinguishes essentially the thread drawing lever of this invention
from that of "Whitt" or any other machine of the same kind is that it is simple
and of special shape and not a rocking lever oscillating about its point of
attachment to its support as is the case in all machines of the above mentioned
system.
Consequently the thread which comes from the bobbin to the guide on the upper
part of the head of the machine descends to and passes through, a similar guide
fixed quite at the bottom thereof, rises therefrom, through the eye in the thread
drawing lever, and passing again through the lower guide, goes afterwards to the
needle.
The result of these arrangements is that the oscillations of the thread drawing
lever during the vertical alternating movements of the needle bar act insensibly
upon the thread as the needle bar reaches its bighest position and that the

page_text: maximum quantity of thread is delivered at the moment when the needle makes
the stitch. Breakage of the thread cannot take place at that moment any more
than at the raising of the needle during which inverse effects are produced.
According to one modification the support for carrying the thread drawing lever
is secured to the head of the machine by an adjusting screw passing through an
oblong slot. Another screw which passes through a curved slot in the support
forces the latter to preserve its hinged joint at an invariable distance from the
needle bar when the said support is moved round on its pivot to raise or lower the
end of the thread drawing lever.
According to another modification, the thread drawing lever may be arranged
inside of the box of the head of the machine. In this case the fixing screw screws
into the head and guides the support as required by means of an internal
prolongation.
A screw fixed in the support traverses along a curve formed in the thickness
of the front of the head and preserving the joint at an invariable distance from
the needle bar.
The head of the thread drawing lever is pierced with several holes for the
purpose of regulating the tension of the thread according to its size and also
according to the nature of the work.
The above described improvements are applicable to all sewing machines the
needle cams of which allow of the connexion of the needle bar with the thread
drawing lever by means of a connecting link.