Improvements in Embroidering Machines.
Year: 1885

page_text: Improvements in Embroidering Machines.
I, RUDOLF BLAU of the firm Berliner Stickmaschinenfabrik Schirmer, Blau et
Cio of Berlin, in the German Empire, do hereby declare the nature of my invention
for "IMPROVEMENTS IN EMBROIDERING MACHINES," and in what manner the same
is to be performed, to be particularly. described and ascertained in and by the
following statement :——
In embroidering or sewing machines, as heretofore constructed, for the production
of cord-like embroidering, seams, the spool is guided in a circular, direction close
above the table near the working parts, an arrangement which has the disadvantage
of fatiguing the sight of the operator and interfering with the performance of the
work. Further in order to provide room for the rotation of the spool it is necessary
to cram the presser bar and the carrier and consequently not only is the feeding
of the material rendered more difficult, but the main casting or block of the
machine has to be very much raised.
These two defects are obviated by the present invention: To this end the looper
is connected with the motor mechanism and a tube enclosing the needle bar, in
such a manner that the said needle bar can work within the above-mentioned tube
independently of the rotation of the looper and of the spool carrier. The thread
passes through a slot of the tube and is protected by a peculiar sheath or sleeve
from injuries or changes of tension which may be caused by the rotation of the
parts. The needle bar is fixed to the upper part of a split hoop or strap in such
a manner that when the needle bar is once set, it constantly retains its proper
height and lateral position when the upper thread spool is being changed.
Referring to the accompanying drawing,
Fig. 1 is a front view, Fig. 2 a longitudinal section and Fig. 3 a section on
line A. B of Fig. 2, of a machine according to this invention.
In this machine the spool a is shown placed on the upper extremity of the
needle bar. This makes it necessary to have a new mechanism for the up and
down motion of the needle bar b which needs to be independent of the motion of
the looper c as well as of the rotation of the spool carrier d.
The following mechanism serves for the rotation of the looper c.
Upon the main shaft e is arranged the screw gear f¹, f, which transmits a
motion to the bevel wheel gear g¹ g², such motion being again transmitted from the
latter to a second bevil wheel gear h¹ h². The bevil wheel 2 is provided with
a sleeve h³ upon which is fastened the looper c with the ring c¹.
The connexion of the looper c with the motor mechanism and the tube k forms
an essential feature of this invention.

page_text: The needle bar b (Figs. 1 and 3) is situated in the said tube k which is slotted
laterally at . Along this slot passes the thread. In order to prevent the latter
from being damaged, the brass sleeve m is placed over the tube k at such a distance
from the outer side as from the opening of the slot of the tube k, that the thread
used retains sufficient play notwithstanding the necessary tension.
At its lower extremity the tube kc (Fig. 3) is strengthened by means of a ring n
in which is placed a screw i whose head rests in the sleeve h³, so that when h³ or
when the toothed wheel h' rotates, the tube k which guides the thread in its slot
likewise rotates and with it the spool carrier d and the spool a.
The needle bar b, after being placed in the required position, is adjusted to its
proper height and lateral position at o and fixed to the upper part of a hoop or
strap which is connected to the tube q by means of the screws p. p. The needle
guiding tube q is moved up and down in a known manner by means of the needle
slide o.
This hoop or strap consists of two parts, the upper hoop r and lower hoop 8.
The upper hoop is mounted by means of fork-like pieces u upon pins which are
fixed to the lower hoop 8 and can be fastened itself. by means of the screw nuts t.
By releasing the nuts t the upper hoop ŕ can be easily raised, whereupon the
spool a can be changed.
The needle bar b remains fixed to the upper hoop r at its proper height and in
correct lateral position, so that the same need not be again adjusted once the two
parts and 8 have been fixed together.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is In tambour or drum embroidering machines
1. The use in combination of a looper mounted upon a sleeve such as h³, which
is driven by the motor mechanism and a tube such as l in which the needle bar
can move up and down independently of the said motor mechanism, substantially
as described and illustrated.
2. Conducting the thread from the spool to the needle through a slot in the tube
which encloses the needle bar, the said slot being covered by a sleeve to protect the
thread substantially as described.
3. Attaching the needle bar to the upper loop of the frame surrounding the
spool, so that it always returns to its exact position after the spool has been
changed, substantially as described.