Improvements in or relating to Shedding Mechanism for Looms.
Year: 1898

page_text: Date of Application, 12th Mar., 1898-Accepted, 11th June, 1898
COMPLETE SPECIFICATION.
Improvements in or relating to Shedding Mechanism for Looms.
I, GEORG SCHWABE, of Biala, near Bielitz, in the Empire of Austria, Engineer,
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 follow-
ing statement:-
This invention relates to an apparatus for forming the shed in power looms
without employing the usual suspension means which raise or lower the harness
by means of cords, straps and pulleys, and consists chiefly in the harness or heddles
being arranged in a guided frame and in being directly raised or lowered by
griffe-blades actuated according to the pattern-card and moved from eccentrics on
the crank shaft of the loom.
Fig. 1 shows the apparatus according to the present invention in front elevation
with a closed shed.
Fig. 2 the same view with open shed.
Fig. 3 is a plan view of same.
Fig. 4 is a side elevation with closed and
Fig. 5 is a side elevation with open shed.
On the crank shaft a of the loom are arranged two eccentric sheaves 6 61 in such
manner that both their lowest and highest positions are opposite each other. On
the eccentric sheaves bb slide eccentric rings c guided at the pivot-points dd by
blades or arms e el pivoted at f and f¹. Between these blades e el are arranged hook
supports g-the number of which depends on the number of harness frames-and
carrying on their lateral projections pivoted hooks h.
From the points i of the hooks h rods k (Figs. 1 and 2) pass to levers 7 which are
connected by means of rods m and pattern card levers n with the pattern card o and
are adapted to be operated by the latter.
The hook supports g are secured directly to the harness frame p.
The harness frames with the hook supports 9 are rectilinearly guided
follows;
as
1) The frames are guided at the sides as well as at the front and back by means
of guides yg (Figs. 1 to 4) secured to the frame of the loom.
2) The hook supports are guided on three sides by means of a connecting barr
and on the fourth side by means of the blades e e¹.
The rods when the blades e e¹ are closed that is to say in the position correspond-
ing to the closed shed (Fig. 1) are horizontal and serve not only to transmit the
motion from the pattern-card to the hooks h, but also to secure the position of the
hooks h relatively to the blades e e during the movement, as they together with
the hooks h move forwards or backwards from the point of attachment a like guide
rods.
The working of the apparatus is as follows;-
The rotating crank-shaft a transmits its motion through the eccentric sheaves bb¹
to rings c c with their pivots which motion is converted into a vertical
reciprocating motion of the blades e c¹ connected to the latter.

page_text: As, however, the eccentrics b b₁ are arranged opposite each other the two
blades e e simultaneously come nearer together or move farther apart. Fig. 4
shows the blades in their nearest Fig. 5 in their remotest position relatively to
each other.
As, moreover the pivots of the eccentric rings are arranged so that in their
lowest position they are quite near the centre of the crank shaft a (Fig. 5) the
vertical reciprocating motion of the blades e e¹ is not a uniform one, but at the
time when the blades e el spread apart there takes place a retardation which is
necessary to enables the shuttle to pass through the open shed.
As the blades e e¹ are moved up and down as levers with one arm this movement
becomes smaller towards the points of suspension f f¹ according to the obliquity of
the open shed, (Fig. 5).
According as the hooks are moved in one or the other direction by the pattern
cardo by means of levers n rod m lever and rod k, their projections appear in
front of the upper blade e or lower blade e¹ and are engaged by them and moved up
or down. As the hooks are secured directly to the harness frames p, the latter
being guided on all sides are raised or lowered and the shed is formed (Fig. 5). The
rods act as guide rods and guide the hooks and hold them in position until the
blades e e¹ have reached their closed (lowest) position (Fig. 4) in which the hooks h
are released by the projection of the hook-support y being held fast, and the pattern-
card can move forward.
The hooks are returned into their normal position as follows;The pattern
card acts in two directions i.e. as soon as a roller in the pattern card comes under
the lever n, the latter is raised and the hook is brought in front of the upper blade c.
As soon however as the roller leaves the lever, owing to the rotation of the cylinder,
the lever descends by its own weight and the rod k brings the hook in front of the
lower blade e¹.
n
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I declare that what I claim is:
1. A shedding mechanism for looms characterised by the harness frame 2 with
the hooks (h) secured to it, being guided and, after the pattern card has been
actuated, being raised or lowered by means of blades (as e e¹) moved up and down by
means of eccentrics on the crank-shaft the position of the operated hooks being
secured by cords or guides (r) substantially as described.
2. The combination and arrangement of parts constituting the complete means
for operating the harness in looms substantially as described or illustrated in the
accompanying drawings.
Tatad 10 d... of Monel 1909