IMPROVEMENTS IN MACHINES FOR SEWING LEATHER AND OTHER ARTICLES
Year: 1876

page_text: PROVISIONAL SPECIFICATION left by Thomas Morgan at the Office of the
Commissioners of Patents on the 31st August 1876. A communication from
abroad by George Valentine Sheffield, Frederick William Kalbfliesch, and John
Fanning, of Brooklyn, King's County, and State of New York, United States
of America.
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THOMAS MORGAN, Secretary of the Inventors' Patent Right Association, Limited,
21, Cockspur Street, Charing Cross, in the County of Middlesex. "IMPROVEMENTS
IN MACHINES FOR SEWING LEATHER AND OTHER ARTICLES." A cominunication
from abroad by George Valentine Sheffield, Frederick William Kalbfliesch, and
John Fanning, of Brooklyn, King's County, and State of New York, United States of
America.
This Invention consists of mechanism contrived to make a lock stitch with waxed
threads, and at the same time to quadruple the thread in the goods, and to draw
the quadruple thread very tightly into the goods, so that the pressure and the wax
will bind the thread and secure it much stronger, and make a far more durable
stitch than is made by the present wax thread machines employed for sewing boot
and shoe soles and the like.
The essential features of the Invention are,―
First. A hook arranged in the arm commonly employed in machines of this class
for holding the shoe to the needle, to pass through the loop of the needle thread, catch
the locking thread, and draw it back and loop it through the needle loop, in such
manner that the needle loop being drawn back flush with the upper surface of the
work by a powerful tension redoubles the loop of the under thread and at the
same time diaws it through the work to the upper surface, and thus quadruples the
thread in the needle hole through the leather, and connects the same from hole to
hole by single locking threads.
The second part of the Invention consists of a spring gripper bar contrived in
connection with the needle bar having a series of transverse tension holes for the
thread, and being arranged in such relation to the head of the machine in which the
needle bar works that it grips the thread powerfully when the needle rises, and holds
it with sufficient tension to draw the aforesaid quadrupled thread into the needle
hole.

page_text: The third part of the Invention consists of the presser which is contrived for
feeding the work, also provided with a couple of rock shafts mounted on the head
of the sewing machine one above another, and each having an arm through which
it is worked by the needle bar, the upper one being raised when the needle bar
rises, and vibrating the presser in the direction for feeding the work, and the lower
one being pressed down to move the prosser back along the work when the needle
bar goes down, and while the needle is in the work and holds it against being
moved by the presser.
Important points in this Invention are,―
1st. The hook arranged in the arm of a sewing machine in relation to the needle
eye, and the guide eye for the under thread, and provided with mechanism for
operating it in such manner that it passes through the loop of the needle thread
and loops the under thread through it.
2nd. The combination in a machine for sewing leather- and other like articles of
a needle, a hook, and a supporting arm, and mechanism for operating the needle and
the hook in an arrangement which quadruples the under thread in the work and
locks it by the needle thread
3rd. The needle bar geared with the arm containing the hook, and thus being
made to turn in unison therewith.
4th. The combination with the needle bar of a gripping bar arranged in the
relation of the bearing plate of the needle bar described, whereby it is made to grip
the thread and hold it when the bar rises.
5th. The combination with the needle bar of a gripper bar having the head, and
being connected to slide in the needle bar, and relatively arranged with the bearing
plate.
6th. The cam rockers, the arms, and collars on the needle bar combined with the
oscillating presser.