Improvements in Sewing Machines for Embroidering, Braiding and the like.
Year: 1899

page_text: Date of Application, 14th Apr., 1899-Accepted, 20th May, 1899
COMPLETE SPECIFICATION.
Improvements in Sewing Machines for Embroidering, Braiding and
the like.
We, DAVID NADEL and HEINRICH HERZBERG, both of No. 4, Spindlershof, Seydel
Strasse, in the City of Berlin, in the German Empire, Manufacturers, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:
-
The present invention relates to improvements in sewing machines such as
described in Patent Specification No. 5702 of 1898.
A braiding and embroidering device is there described in which the crank on the
shaft operating the thrust ring is moved mechanically by a cam, such as a cylinder.
It is the object of the present invention to provide a means whereby the dead
points of the cam groove or surface, which through the agency of intermediate
imechanism operates the crank shaft, are overcome.
On the accompanying drawing
Fig. 1 is a side elevation of the new device and parts of the sewing machine to
which it is attached.
Fig. 2 is an underside view of the same.
The general construction is in essentials substantially the same as that shown in
the Patent Specification already referred to; but instead of there being only one
crank a on the shaft b operating the thrust ring, two cranks are provided. The
second crank al is arranged at an angle of about 45° to the crank a, and is provided
with a connecting rod c¹, having at its end a pin or sliding block 6', running in a
cam groove f on the periphery of the cylinder or drum g. This end of the
rod c is further shown pivoted to a lever arm, the other end of which is pivoted
to the framework of the sewing machine. The said parts all operate similarly to the
rod c, pin e, lever d and groove f actuating the leading crank a.
The groove fl
in the cylinder g is of such form that the crank a¹ is actuated by it when the
crank a (that is the groove f) stands in its most unfavourable position, viz. when
the pine is in the neighbourhood of the right or left culminating point of the
groove f.
The advantage of such an arrangement is that the machine can be started in any
position, without any dead point having to be overcome.
Moreover there is a great saving of power effected, for opposite to each steep
portion of the one curved groove, is a less steep portion of the other curved groove.
Thus the pressure which has to be exerted on the crank a or a¹ is correspondingly
distributed between the sliding pins or blocks e and e¹.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is
1. In a sewing machine for embroidering, braiding and the like in which the
crank on the shaft operating the thrust ring or fabric feeder is connected by a

page_text: system comprising a rod and lever or the like with a cam cylinder or its equivalent,
the surface of which is so formed as to actuate the said crank mechanism in such
manner as to produce the pattern required, the combination with the said parts of a
second crank set at an angle to the said first crank on the said shaft, and by a
system comprising a rod and lever or the like connected with the said cam cylinder
or its equivalent, in such manner that another cam surface or groove on the latter
actuates the second crank mechanism when the first crank mechanism is at or near
its dead point, all substantially as and for the purposes hereinbefore set forth.
2. In a sewing machine for embroidering, braiding and the like as described in
Claim 1, the general arrangement and combination of parts for operating the
crank shaft by means of two cranks placed at an angle to each other, all
substantially as described and illustrated on the drawing.
Dated this 19th day of April 1899
DAVID NADEL,
HEINRICH HERZBERG,
Applicants.