IMPROVED MECHANISM OR APPLIANCES [a FOR PRODUCING ORNAMENTAL STITCHING IN SHUTTLE SEWING MACHINES
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by Friedrich Carl Glaser at the Office of
the Commissioners of Patents on the 8th October 1883. A communication
to him by Gustav Albin Greiner of Reichenbach Voigtland in the German
Empire.
FRIEDRICH CARL GLASER of Berlin in the Kingdom of Prussia and Empire of
Germany, Engineer and Patent Solicitor "IMPROVED MECHANISM OR APPLIANCES
[a
FOR PRODUCING ORNAMENTAL STITCHING IN SHUTTLE SEWING MACHINES
"
communication to him by Gustav Albin Greiner of Reichenbach Voigtland in the
German Empire.]
This invention relates to improved mechanism or appliances to shuttle sewing
machines, whereby ornamental stitching may be produced by means of one, two,
three or more needles, and which can be employed for embroidery and the like,
without depriving the sewing machine of its ordinary character. The said
appliances can be adapted to sewing machines that are adapted to button hole
stitching, in which either the entire needle bar with the needle has a lateral motion
imparted to it (as shewn at Figs 1, 7, 8 and 9 of the accompanying drawings) or
in which only a slide in the needle bar, carrying the needle (Figs 10 and 11) has
such motion. The sliding needle yoke a of such a machine is arranged to receive
one, two, or more needles, and the needle hole b in the needle plate c (Fig 4) is
correspondingly widened, to afford sufficient space for the passage of the needles.
The course of the shuttle towards the inner side of the machine is a positive one
in order to tighten the thread drawn through the loop; it consequently has to be
varied according to the number of the needles, and it is therefore necessary to be
able to shorten or lengthen this course. For this purpose, the connecting rod d
(Figs 1 and 3) that moves the shuttle holder to and fro, as also the crank e thereof
(Fig. 1) are provided with an adjustment, which allows of the lengthening or
shortening of these parts.
For introducing insertion threads a special channel ƒ (Figs. 4, 5 and 6) is provided,
formed by grooving the base plate g and needle plate c. This channel terminates
in three or more apertures (according to the number of insertion threads) in the
needle hole b of the plate c (Fig 4).
The separate apertures have for their object to prevent the entanglement of the
threads. The needle hole in the base plate g below the needle plate is also

page_text: widened corresponding to the number of needles, and in the event of only one
needle being used, it can be reduced to the ordinary width by screwing on a
covering plate. The presser i (Fig 2) is formed with a groove l'in order to allow
of the passage of the seams rendered thick by the insertion threads. Each thread
of each needle has its particular tension device m, m³, and m³. The arrangement
for fixing the needles can be variously constructed; Figs 7, 8 and 9 shew an
arrangement for button hole apparatus in which the entire needle bar is moved
laterally.
The needles are held by a plate having grooves for the introduction of the
needles, and secured by screws a¹.
In the arrangement for button hole stitching shewn at Figs. 10, 11 and 12, the
needle bar does not move laterally, but only the sliding needle yoke a³, which has
vertical holes for the reception of the needles. One of the needles is held by a
special screw, while the others are held by a single screw, a block having grooves
for determining the distance of the needles being inserted.
In Figs. 18 to 23 are shewn to an exaggerated scale, the ornamental sewing
produced by means of the before described appliances. Figs 18 and 19 shew an
ornamental stitch produced by a single needle; Figs. 20 and 21 a stitch produced
by two needles; Figs 22 and 28 a stitch produced by three needles.
The mode of forming the stitch will be readily understood from the drawing.
The needle with the needle thread X descends through the fabric alternately on
opposite sides of the insertion thread y, and at each stitch the shuttle thread Z is
passed through the loop formed by the thread X, in the same manner as with
ordinary shuttle machines. With stitching produced by two needles the shuttle
thread passes through both loops of the thread X and X', and with three needles
it passes through the loops of the three threads X X¹ X³. In the latter case the
shuttle thread assumes a zig-zag form on the middle insertion thread.
The arrangement with several needles can also be applied to machines without
button hole apparatus. In this case two needles would be provided for one
insertion thread, three for two such threads, and so on, there being in this case a
straight line of stitching produced on each side of the insertion thread. The
latter can also be attached to the top of the fabric instead of below. In this case
the presser i is formed with 1, 2, 3, or more openings k (Figs. 16 and 17) for the
insertion threads. The latter are unwound from spools carried in the machine
and are led by a suitable guide through the openings k on to the fabric, where
they are attached by the needle threads.
In order to enable the needles to be readily and accurately inserted into the
needle yoke, the needle holder Figs 13 14 and 15 is employed. A plate n is
provided with grooves for the needles, and the needles are held in these grooves by
slides o acted upon by springs p. Each slide has a handle q and can be withdrawn
separately. In order to fix the needles correctly in the needle yoke, they are
placed in the holder so as to cause the small pins fixed at r to enter their eyes,
whereby a uniform position of the needles is insured. The needles thus held are
then secured with their upper ends in the needle yoke of the machine