Improvements in Sewing Machines.
Year: 1892

page_text: Date of Application, 26th May, 1892
Complete Specification Left, 24th Feb., 1893-Accepted, 25th Mar., 1893
PROVISIONAL SPECIFICATION.
Improvements in Sewing Machines.
I, MARK THOMAS DENNE, of 1, Tower Road, Eastbourne, in the County
of Sussex, Engineer, do hereby declare the nature of this invention to be as
follows:-
My invention relates to sewing machines and especially to that class of such
machines known as lock stitch fair stitching machines and in which barbed needles
are employed.
The object of my present invention is to provide improved means for introducing
the thread into the barb of a needle.
According to my invention I provide a fixed blade having an inclined edge
which forms with the needle a V-shaped aperture and in conjunction with this
blade I employ a thread puller designed to engage with the thread by means of a
hook and to be operated to pull the same into the V-shaped aperture and so into
the barb of the needle. The said thread puller also serves to provide sufficient
slack to prevent the thread from being chafed as the needle draws back at the
same time that it is pulling the thread down the incline into the barb.
Dated the 26th day of May 1892.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Sewing Machines.
I, MARK THOMAS DENNE, of 1, Tower Road, Eastbourne in the County of
Sussex, Engineer, 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 :--
My invention relates to sewing machines and especially to that class of such
machines known as lock-stitch fair-stitching machines and in which barbed needles
are employed.
The object of my present invention is to provide improved means for introducing
the thread into the barb of the needle of such a machine.
According to my invention I provide a fixed blade or guide having an inclined
edge which forms with the needle a V-shaped notch and, in conjunction with this
blade, I employ a thread-puller designed to engage with the thread by means of a
hook and to be operated to pull the same into the V-shaped notch and so into the
barb of the needle. The said thread-puller also serves to provide sufficient slack
to prevent the thread from being chafed by running through the barb as the needle
rises.
To enable my invention to be fully understood I will describe the same as applied
to the machine forming the subject matter of my application of even date with this
application and in the accompanying drawings:-
Figure 1 is a front elevation of such a machine having my improvements applied
thereto :
Figure 2 is a plan of the same; and:
Figure 3 is a section on the line 3 3, Figure 1:
Figure 4 is an elevation of my thread-puller and its operating mechanism; and,
Figure 5 is a plan of the same.

page_text: :
Figures 6 and 7 are views at right angles to each other illustrating one stage of
the operation; and,
Figures 8 and 9 are similar views illustrating another stage.
Similar letters of reference indicate corresponding parts in the several figures.
a indicates the frame of the machine, the barbed needle, c the awl, d the work-
support or welt-guide, and.e the shuttle, all of which parts are fully described in
the Specification before referred to.
fis my thread-guide which consists of a plate having an inclined edge so
arranged that when the needle is in its lowermost position it will form with the
said inclined edge a V-shaped notch, as indicated at g', Figure 6. The said
thread-guide is attached to a bracket below the work-support or welt-guide d, as
'shewn.
cam.
i is my thread-puller which consists of an arm having a hooked end j and is
secured to a bar k sliding in bearings in the frame a, as shewn in Figures 1 and 4.
The said bar k has also connected to it an arm m carrying a roller n running in
a groove o of a camp, the said cam being secured to the driving-shaft 7 of the
'machine. The said arm m also carries rollers r, running on the periphery of the
It will be noticed by reference to Figures 4 and 5 that the periphery of
the cam is so shaped as to impart a forward and backward movement to the hook
in addition to the lateral movement imparted thereto by the groove o. Normally
the hook occupies a position at one side of the path of the needle and its first
movement is laterally in order to cause it to engage with the thread, then rear-
wardly to pull the thread into contact with the needle so that, when the needle
rises, the barb will take the thread, then forwardly to slacken the thread as it is
pulled by the needle through the work and then laterally to disengage itself from
the thread. In order that the hook j may partake of these different movements,
the bar to which the puller is attached is adapted to slide and also partially
rotate in its bearings under the action of the cam p. s is a spring which serves
to keep the rollers r, in contact with the periphery of the cam.
The operation of the apparatus hereinbefore described is as follows:- - Assume
the needle to be at the lowest point of its stroke, as shewn in Figures 6 and 7 and
the hook of the thread-puller in front of the thread as shewn in Figure 6, the
said hook now engages with the thread from the last stitch and pulls it backwards
whereby it runs down the inclined edge g of the thread-guide into the V-shaped
notch formed at g' by the needle and thread-guide f as shewn in Figure 8, so that
the thread lies against the needle and a loop of thread is formed between where it
crosses the barb of the needle and the last stitch, as shewn in Figures 8 and 9.
The needle now moves upwards and in doing so takes the thread, with its barb at
the same time the thread-puller i comes forwards until it reaches the front when the
. thread-puller is disengaged from the thread.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
1. In a sewing machine having a barbed needle, the combination with the
needle of a thread-guide adapted to form with the needle when in its lowest
position a V-shaped notch, and a thread-puller for drawing the thread into the
notch so that it will lie against the needle and in the upward movement of the
latter the barb of the needle will take the thread; substantially as described.
2. In a sewing machine the combination with the needle of a thread-guide having
an inclined edge and a thread-puller adapted to make to-and-fro movements and
also lateral movements substantially as, and for the purposes, described.
Dated this 0141
T1.
1000
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.