An Improved Under-thread Receiver for Ring Shuttle Lockstitch Sewing Machines.
Year: 1891

page_text: Date of Appl cation, 14th Aug., 1891-Accepted, 14th Nov., 1891
COMPLETE SPECIFICATION.
An Improved Under-thread Receiver for Ring Shuttle Lockstitch
Sewing Machines.
REGINALD HADDAN of the firm of Herbert & Co. Patent Agents of
18 Buckingham Street, London W.C. Civil Engineer do hereby declare the nature
of this invention a communication to me from abroad by Felix Engel of Graskeller 21
Hamburg in the Empire of Germany Civil Engineer 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 to enable suitable balls of thread as sold in
commerce to be used without rewinding for supplying the under thread of a lock-
stitch sewing machine. To this end the invention relates to lockstitch machines
provided with a ring shuttle within which the spool or under thread receiver is
placed and it consists in the special construction of this receiver by means of which
the commercial ball of thread placed therein may be unwound as the sewing
proceeds without twisting or forming loops or knots interfering with the action of
the machine.
In the accompanying drawing
Fig. 1 is a side elevation of a ring shuttle with parts of the machine adjacent
thereto and fitted with the improved under thread receiver.
Fig. 2 is a section thereof.
Figs. 3 and 4 are sectional views of the improved under thread receiver.
The under thread receiver consists of the outer casing the bottom h¹ of which
is perforated at the centre and provided with the tubular spindle i which extends
as far as the outer surface of the cover plate d which may be fastened to the casing h
by a hinge m and spring catch e" and is provided with a central opening o of a
slightly larger diameter than the outside diameter of the spindle i so that when the
cover is closed and the end of the spindle i lies within the said opening o sufficient
space is left around the spindle for free passage of the thread. On the cover d is a
thread tensioner or brake of suitable form for instance a leaf spring fastened on
the cover and regulated in tension by a screw t. The ball of thread A is placed
upon the spindle i and the end of the thread is passed through the hole o in the
cover d and thence under the spring so that the thread is pressed between the
spring and the cover at p. To provide for the convenient passing of the thread
under the spring without requiring the loosening of the latter, in the cover d is
cut a groove or depressed passagen passing under the spring so that the end of
the thread may be easily threaded through this groove in the direction of the
arrow Fig. 3 and afterwards drawn laterally under the spring to the position it is
to occupy at p. The closed thread receiver is then placed in position within the
ing shuttle and fixed in the usual way by spring D and nose 61, the tubular spindle
being placed upon the pin e lying in the axial centre of said ring shuttle. By
causing a central tubular spindle i to project to a level with the outer face of the
over plate d and thus forming an annular slit round about the end of this spindle
or passage of the thread, danger of twisting together and entanglement of the
hread within the thread receiver due to the unwinding or loosening of one or more
urns of thread in the ball A is avoided.
Having now particularly described and ascertained the nature of this inven-
ion and in what manner the same is to be performed I declare that what I
laim is.
For ring shuttle lockstitch sewing machines.

page_text: adapted to receive a ball of thread and a cover having an orifice for passage of the
free end of said spindle whereby an annular opening is formed for passage of
the thread as and for the purpose set forth.
2. An under thread receiver consisting of a casing having a central tubular
spindle adapted to receive a ball of thread in said casing and to support said casing
upon an axial pin ein the ring shuttle in combination with a cover to said casing
having an orifice for passage of the free end of said tubular spindle whereby an
annular opening is formed for passage of the thread as and for the purpose set
forth.
3. An under thread reel receiver consisting of the casing with spindle i cover d
with orifice o forming an annular opening with said spindle, thread tension or
brake spring and groove n in combination substantially as and for the purpose
described.
Dated this 14th day of August 1891
HERBERT & Co.,
18, Buckingham Street, Strand, London, W.C., Agents to Applicant.