IMPROVEMENTS IN OR CONNECTED WITH SEWING MACHINES
Year: 1881

page_text: LETTERS PATENT [to Friedrich Heyrich and Friedrich Quenstedt, both of
Berlin, in the German Empire, for an Invention of "IMPROVEMENTS IN
OR CONNECTED WITH SEWING MACHINES." A communication from the
Actiengesellschaft, vorm: Frister und Rossmann, of Berlin, in the German
Tmning
PROVISIONAL SPECIFICATION left by the said Friedrich Heyrich and
Friedrich Quenstedt at the Office of the Commissioners of Patents on the
13th April 1881.
FRIEDRICH HEYRICH and FRIEDRICH QUENSTEDT, both of Berlin, in the
German Empire. "IMPROVEMENTS IN OR CONNECTED WITH SEWING MACHINES."
A communication from the Actiengesellschaft, vorm: Frister und Rossmann, of
Berlin, in the German Empire.
The present improvements consists in a special device for automatically
disengaging the bobbin when it is reeled, and in a special arrangement of
Carter's valve" and guide frame for the purpose of facilitating the introduction
of the thread.
"
The bobbin holder is pivoted on a bolt which is secured to a frame. The latter
is attached by a screw to the table or platform of the sewing machine, and is held
in the ordinary way by a tappet.
The bobbin holder is elevated for winding up the thread, so that an india rubber
ring or washer mounted on its shaft comes into contact with the fly wheel. In
this position it is kept by a click which engages with a tooth provided on the
bobbin holder.
The Carter's valve or folder is pivoted on the same bolt as the spool holder, and
is pressed against the bobbin by a spring which is screwed down upon the bobbin
frame, and at the same time presses against a tappet attached to or forming part of
the valve.
To effect the automatic disengagement of the apparatus when the bobbin is
reeled we employ the following device-The click has the shape of an angle lever,
one arm of which carries a pin which rests against the back of the valve.

page_text: When the bobbin is to be reeled, the valve presses against the said pin, turns
the angle lever, and disengages the click, so that the bobbin frame is repelled by
the spiral spring, by which motion the aforesaid friction ring recedes from the
periphery of the fly wheel.
A catch applied to the valve serves for the exact adjustment (up to a certain
diameter) of the bobbin, and can be moved upwards and downwards upon the
valve, so as to bring it into contact with the aforesaid pin sooner or later.
The angle lever is continually pressed inwards against the valve or bobbin frame
by a spiral spring.
In order to guide the thread easily to the bobbin the guide frame is movable
round one of its fastening screws.

page_text: DHEL
TON in pursuance of the conditions of the Letters Patent nied
by the said Friedrich Heyrich and Friedrich Quenstedt in the Great Seal
Patent Office on the 12th October 1881.
"
FRIEDRICH HEYRICH and FRIEDRICH QUENSTEDT, both of Berlin, in the
German Empire. IMPROVEMENTS IN OR CONNECTED WITH SEWING MACHINES."
A communication from the Actiengesellschaft, vorm: Frister und Rossmann, of
Berlin, in the German Empire.
The present improvements consists in a special device for automatically
disengaging the bobbin when it is reeled, and in a spcial arrangement of "Carter's
valve" and guide frame for the purpose of facilitating the introduction of the
thread.
Reference being had to the accompanying Drawing, in which,
Figures 1 and 4 are side views of the bobbin holder and disengaging device:
Figures 2 and 3, front views of the same.
Figure 5, a detail view of the thread guide when folding down;
And Figure 6, a horizontal view of the frame only.
The bobbin-holder A is pivoted on a bolt B which is secured to a frame C. The
latter is attached by a screw a to the table or platform of the machine, and is held
in the ordinary way by a tappet D (see Figure 6).
The bobbin-holder A is elevated for winding up the thread, so that an india-
rubber ring or washer 6 mounted on its shaft comes into contact with the
fly-wheel (Figure 2).
In this position it is kept by a click c which engages with a tooth d provided on
the bobbin-holder A.
The "Carter's valve " or folder F is pivoted on the same bolt B as the bobbin-
holder A, and is pressed against the bobbin by a spring G (Figures 4 & 5), which
is screwed down upon the bobbin-frame A, and at the same time presses against a
tappet e attached to or forming part of the valve F (Figure 5).
To effect the automatic disengagement of the apparatus when the bobbin is
reeled we employ the following device :-
The click has the shape of an angle-lever c, f, one arm of which carries a pin f
which rests against the back of the valve F.
When the bobbin is to be reeled, the valve presses against the said pin f, turns
the angle-lever c, f, and disengages the click c, so that the bobbin-frame or holder A
is repelled by the spiral spring g (that is to say, the bobbin-holder is moved from
the position as in Figure 2, into the position as shown in Figure 3), by which motion
the aforesaid friction-ring b recedes from the circumference of the fly-wheel.
A catch i (Figures 2, 3, & 4), applied to the valve serves for the exact adjustment
(up to a certain diameter) of the bobbin, and can be moved upwards and
downwards upon the valve so as to bring it into contact with the aforesaid pin f
sooner or later.
The angle-lever is continually pressed inwards against the valve F, respectively
the bobbin-frame A by a spiral spring k (Figure 4).
In order to guide the thread easily to the bobbin, the guide-frame H is moveable
on one of its fastening-screws (see dotted position in Figure 1).
In Figure 5 the manner is shown in which the open eye of the guide frame H is
clutched when the guide frame folds down.

page_text: Third. The arrangement of the spring G between the bobbin-holder A and
valve F, substantially as described and illustrated.
Fourth. The arrangement of the guide frame H which is moveable round one of
its fastening screws, being so constructed as to fold upwards, substantially as
described and illustrated.
In witness whereof, we, the said Friedrich Heyrich and Friedrich Quenstedt,
have hereunto set our hands and seals, this Tenth day of October, A.D.
1881.
FRIEDRICH HEYRICH.
(L.S.)
FRIEDRICH QUENSTEDT. (L.S.)