Improvements in Sewing Machines.
Year: 1893

page_text: COMPLETE SPECIFICATION.
Improvements in Sewing Machines.
We, JOHANNES HAAS, of 1, Postplatz, Eibenstock, Engineer, and RICHARD
LINTZ, of 109, Grüner Weg, Berlin, Manufacturer, both in the Empire of
Germany, 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 :-
Our invention relates to sewing machines of that class which is especially adapted
for braiding or cording and is characterized by the fact that a feeding mechanism
which acts in all directions does not, as in the Bonnaz machine, already in use,
work with a revolving needle bar and the revolving mechanism for forming the
stitch connected with the needle bar, but with a needle bar so secured that it
The mechanism for actuating the needle is thus rendered somewhat
more complicated, but the machine is much simplified in consequence as regards its
other working parts, and admits of the employment of a simple shuttle or a hook
for the purpose of forming a lock stitch the machine being therefore especially
suitable for sewing on cords or braid.
cannot rotate.
In the accompanying drawing,
Figure 1 is a side elevation partly in section of a sewing machine constructed
according to our invention.
Figure 2 is an end elevation, partly in section of the same, and,
Figures 3 to 6 are views of details.
For the formation of the lower thread a shuttle moving to and fro, on Singer's
system, is chosen as an example.
The needle bar c moves freely in the main tube a of the usual feeding arrange-
ment of a crank machine but does not share in the rotation of the tube, on the
contrary it is secured against any movement of rotation. For this purpose the
upper end of the needle bar c, Figure 1, is connected with the needle bar
thruster b by an arm and a set screw. The thruster is guided in the head B'
of the arm B and is set in motion through the medium of the curved slot ³ and
the crank disc 63 of the spindle. The great width of the tube a required for the
arrangement for feeding in the cord (to be described hereafter) renders it necessary
that the needle bar should be guided below also, and it is therefore secured by a
clamp screw e inserted in a piston sliding in a piston tube a¹ which piston
contains a seating for the needle which is to be secured in place by the clamp
screw c, Figures 5 and 6. For the purpose of guiding the upper thread the needle
bar c is provided with an axial perforation et which opens laterally at the upper
end of the piston, and runs along in the latter, Figure 6. The upper thread is
guided from the bobbin upon the arm B through a special loop or groove c³ in the
head B¹ to the tension mechanism c then upward through the eye of the thread
lever and again downwards through the perforation c¹ of the needle bar and the
piston into the needle, Figures 1, 2, and 6.
The driving of the spindle is effected from the main spindle a² by means of
bevel wheels and an intermediate spindle and also the shuttle is actuated from
the main spindle a² by means of the rod f³ crank disc f2 and shaft f'.
The driving of the feeder S is correspondent exactly to the usual arrangement
in the Bonnaz machine and therefore requires no further description.
The stirrup d which carries the spool d' of braid moves with the main tube a
around the needle bar c as soon as the crank A is set in action.
The braid to be sewn on is guided downwards from the spool d' into the annular
space de formed between the needle bar c and the main tube a or the piston tube a¹
which space it leaves by the slot d³ in the latter tube a' and is guided through the
braid guide d' under the needle.

page_text: Since the stroke of the main or piston tube a' is always of the same extent, but
the thickness of the material to be worked upon varies, the piston tube a¹ must
allow the braid guide, which acts at the same time as a presser-foot, and is set in
motion by the piston tube, a certain amount of longitudinal play. This necessitates
an arrangement which is shewn in vertical sectional elevation and in horizontal
section drawn to a larger seale, in Figures 3, 4, 5 and 6.
The braid guide d' is screwed firmly to a sleeve d³ to which a certain amount of
longitudinal motion upon the piston tube a¹ can be imparted, which motion is
limited by a screw pin de fixed in the piston tube and moving in a slot in the
sleeve do.
This longitudinal motion may also be lessened or increased by a wedge piece do,
extending over the slot d' and adjustable on the sleeve by means of a slot d" and
clamping screw ", according as the presser-foot or braid guide has to be placed
higher or lower to adapt it to the thickness of the material. The pin 3 serves
to support the wedge piece in order to prevent the latter from turning upon the set
screw d¹
In the lowest position of the piston tube a¹ the latter presses the presser-foot or
braid guide d down by means of the screw pin do the wedge piece id and sleeve d',
thus holding the material tight whilst the needle is driven through it as illustrated
by Figure 3. As soon as the formation of the stitch is completed, the piston
tube a¹ rises, whilst the presser-foot or braid guide at first retains its position
under the action of a spring d situated between the sleeve d³ and a ring or
collar d' fixed on the piston tube a¹ until the pin comes into contact with the
upper rim of the slot and lifts it from the material as illustrated in Figures 4
and 5, whereupon the feed S advances the material by the length of a stitch. The
spring d is only intended as may easily be seen, to restore the connection between
the piston tube a¹ and the presser-foot or braid guide d after this connection has
been interrupted by the slot d°.
Instead of driving the needle bar thruster 64 by a separate spindle b¹ the main
spindle a² might be employed for this purpose, but in this case the arrangement of
the revolving braid spool d¹ involves difficulty. Instead of a shuttle moving in a
straight line a rotary shuttle or hook may be employed beneath the feed plate.
Having now particularly described and ascertained the nature of our said inveu-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. A machine for sewing on cord or braid, with a feeder acting in any direction
which feeder works with a needle bar secured against rotation, and operated by a
special head and thereby allows of the use of a shuttle or hook mechanism:
independent of the crank, for the purpose of producing a lock stitch, substantially
as hinbefore described.
2. In a machine for sewing on cord or braid of the kind claimed in Claim 1,
driving the needle bar by means of a special spindle which actuates the
needle bar thruster guided in the head B' of the arm B, substantially as set
forth.
3. In a machine such as is claimed in Claim 1, the hollow needle bar c moving
freely in the main tube a of the feeding mechanism, which needle bar is guided
in the main or piston tube by means of a piston c² substantially as set forth.
4. In a machine such as is claimed in Claim 1, the mechanism for sewing on the
braid, and presser foot or braid guide d' connected with the piston tube a¹ so as to
be adjustable within certain limits, substantially as set forth.
5. The improved sewing machine hereinbefore described and illustrated in the
accompanying drawings.
Dated the 14th day of T.1 1002
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.