AN IMPROVED SEWING MACIUNE
Year: 1876

page_text: LETTERS PATENT to Hector Auguste Dufrené, of No. 10, Rue de la Fidélité,
Paris, in the Republic of France, and 4, South Street, Finsbury, London, Civil
Engineer and Patent Agent, for the Invention of "AN IMPROVED SEWING
MACIUNE." A communication from Monsieur Jose Ribeiro Vicira de Castro,
residing at Porto. in the Kingdom of Portugal.
ealed the 28th October 1876, and dated the 1st May 1876.
PROVISIONAL SPECIFICATION left by the said Hector Auguste Dufrené
nt the Office of the Commissioners of Patents on the 1st May 1876.
-
HECTOR AUGUSTE DUFRENÉ, of No. 10, Rue de la Fidélité, Paris, in the Republic
of France, and 4, South Street, Finsbury, London, Civil Engineer and Patent Agent.
"AN IMPROVED SEWING MACHINE."
This Invention consists chiefly in arranging the lower part of sewing machines
in such a manner as to allow of a considerable supply of the second thread being
provided (like an ordinary bobbin) so as to last for several hours without inter-
rupting the work.
On the driving shaft I arrange a hollow cylinder carrying a point formed with
grooves serving to hold the loop of the thread, and a hook to which an alternate
circular movement, is communicated by means of a shaft, a pinion, and a toothed
segment carrying a knob or pin placed in the groove of a cam or eccentric. The
bobbin is placed in a case, which is itself placed in a sloping tube fixed under the
machine. When the machine is at work the hook takes hold of the loop of the
thread formed by the movement of the needle and draws it along, the point of the
cylinder widens it and causes it to pass into the tube around the bobbin at the
moment that the hook in turning leaves it, then at the following turn the hook
returns and again takes the thread and forms the point below.
I arrange the driving pulley in two parts gearing together so as to allow of
taking the machine to pieces without it being necessary to remove the driving
band.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Hector Auguste Dufrené in the Great Seal Patent Office on
the 30th October 1876.
HECTOR AUGUSTE DUFRENÉ, of No. 10, Rue de la Fidélité, Paris, in the Republic
of France, and 4, South Street, Finsbury, London, Civil Engineer and Patent
Agent. AN IMPROVED SEWING MACHINE." A communication from Monsieur
Jose Ribeiro Vieira de Castro, residing at Porto, in the Kingdom of Portugal."
"
In all sewing machines in which two threads are employed it is well known that
the apparatus containing the lower thread must necessarily be of small dimensions
and that in consequence no considerable quantity of thread can be provided, thereby
necessitating frequent renewal of this supply and loss of time.
The main object of my Invention is to provide the means of allowing the
employment at the lower part of the machine of ordinary wooden bobbins or reels,
so as to provide the machine with a sufficient supply of thread for several hours of
uninterrupted work.
To make my Invention more easily understood I will describe the same by
reference to the accompanying Drawing, in which Figure 1 represents in perspective
the lower part of a sewing machine arranged according to my Invention. Figures
2 to 7 represent the details; Figure 4 shows at I an ordinary reel or bobbin,
this bobbin is placed on the axis of the case represented in Figure 3; this case
carries a cone G, and a tie piece in which holes c, c, are made through which
passes the thread unwound from the bobbin before its passage into the knot or
loop of of the needle thread in order to regulate the tension. This case, which should
be crossed by the upper thread, is placed so as to move freely in the tube,
Figure 2. This tube consists of a metallic cylinder H, open laterally and
furnished at J with a slide suitable for fixing it under the machine. Figure 5
represents the apparatus for passing the upper thread around the case, Figure 3;
it is composed of a hollowed or grooved cylinder A, provided in front with a
point F, furnished with two grooves x, x, serving to receive the thread. A hook C,
moveable around an axis in the groove or hollow of the cylinder, is moved by a
Sinall arbor B, having at its other end a pinion D. This pinion gears with a toothed
segment m, Figures 5 and 6, placed at the extremity of an arm oscillating round
the centre h, and furnished with a projecting knob or pin l, which can be introduced
into the groove of a cam or excentric E, shewn separate at Figure 7. It will be
understood that the cylinder A and the excentric being in their place the rotating
movement of the shaft K, Figure 1, will give to the segment m, to the pinion D,
and consequently to the hook C, an alternate circular movement. This being done
the excentric E is fixed in its place and the cylinder A on the extremity of the
shaft K, the bobbin J is placed on the arbor d of the case Figure 3, which is enclosed
in the chamfered or sloping tube H, itself fixed at J, in a suitable slide. The axis K
being put in motion the stitch is made as follows:-If the needle thread be passed
underneath the hook C seizes and draws it with it in its passage, the point Fin
passing in its turn separates it and the two sides are placed in the grooves x.
two threads a, Figure 1, are then separated and in the position shewn in the Figure,
the upper part of the case commences to pass between them, then the excentric E
commencing to act causes the hook C to go back into the interior of the cylinder A,
the thread is released when its curve has passed the cone G, and is thus introduced
into the tube H, the bobbin and the case having passed through the loop it remains
in this position for about half a turn, except in case of breakage or pressure, then
the small hook in returning takes up the needle thread to form a new loop and
takes up at the same time the thread of the bobbin, and in this manner the stitch
is regularly formed, the thread of the bobbin unwinding in a regular manner in
consequence of its passage through the holes e, e.
The

page_text: I will not describo the other parts of the machine these being well-known and
not wishing to claim the modifications made therein. I will only describe a peculiar
arrangement of the driving pulley.
The driving shaft of the machine to which motion is transmitted by any suitable
motor is terminated by a pulley P, Figure 1, on which is placed the driving band,
one of the faces of this pulley is terminated by projections taking into the corre-
sponding face of the pulloy L, when the pulley is lowered with the rest of the
machine by means of hinges Z. This mode of gearing allows of raising the machine
to examine the lower part thereof, without it being necessary to remove the strap.
Having thus described the nature of the said Invention and the best means with
which I am acquainted for carrying the same into effect, I wish it to be understood
that I do not confine myself to the precise details herein laid down and shewn in
the Drawing, but what I claim is―
Firstly. The construction and employment of a hollow or grooved revolving
cylinder provided with a point and a hook moved by a pinion shaft and a segment
in combination with a fixed cam as herein-before described and represented in the
accompanying Drawing.
Secondly. The construction and employment of a bobbin case combined with an
open tube constructed so as to enclose an ordinary wooden bobbin as herein-before
described and represented in the accompanying Drawing.
Thirdly. The combination of the said parts with the object of allowing the em-
ployment of a much more considerable supply of the lower thread than can be done
by hitherto known means as herein-before described.
Fourthly. The employment of the gearing pullies for allowing of raising the
mechanisin of the machine without disengaging the driving band as herein-before
described.
In witness whereof, I, the said Hector Auguste Dufrend have hereto set my
hand and seal, this Twenty-eighth day of October, in the year of our Lord
One thousand eight hundred and seventy-six.
H. A. DUFRENÉ. (L.S.)