Multiple Shuttle Changing Apparatus for Power Looms.
Year: 1894

page_text: Date of Application, 20th Dec., 1894-Accepted, 30th Mar., 1895
COMPLETE SPECIFICATION.
Multiple Shuttle Changing Apparatus for Power Looms..
I, GEORG SCHWABE, of Biala, near Bielitz, Austrian Silesia, Manufacturer,
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 :--
Power looms with shuttle changing devices do not generally attain the speed
and capacity of production that are possible with looms without multiple shuttles.
In particular those looms having arrangements for more than a quadruple change
and with rising and falling boxes are limited in their speed, because a greater
Dumber of boxes necessitate so complex a construction that all the main require-
ments of a change of shuttles, such as uniform motion free from shocks, and
absolutely reliable rising and falling of the boxes with a minimum expenditure of
power, can generally not be simultaneously obtained.
The present invention relates to an improved shuttle changing apparatus for
multiple (eight fold) changes which fulfils all the required conditions in so complete
a manner that the capacity of production and speed of such looms are nearly equal
to those of looms without change of shuttles.
The said apparatus is so arranged that all the moving parts from the cranks or
eccentrics situated side by side on the driving shaft to the shuttle boxes themselves
are in perfectly close connection, whereby the raising or lowering of the shuttle
boxes can be effected in a perfectly easy and reliable manner.
The end positions of the separate boxes or cells are determined by the end
positions of the cranks or eccentrics, in which positions (dead centres) every
pressure produced is taken by the rigid shaft.
For preventing inaccuracies in the different vertical motions an arrangement is
provided whereby the raising devices only receive so small a stroke that the are
described by the same hardly differs perceptibly from a straight line, and that
consequently at the end positions of the corresponding levers no inequalities of the
stroke can be produced by relative shortening.
In order to avoid the action of the momentum of the masses in motion at high
speeds of the loom, as also the wear of the moving parts, the weight of the shuttle
box and carrier is entirely balanced both in the rising and the falling motion by
means of a helical spring connected to the carrier.
I will describe the said invention with reference to the accompanying drawings
in which, on Sheets I to IV is shewn the construction for 6 positions, while
Sheets V to VIII shew diagrammatic views for eight, five, and four positions of
the multiple apparatus.
Fig. 1 shews a front view, Figs. 2 and 3 section and side view, Figs. 4 and 5
enlarged sectional plans, Fig. 6 a full sized diagram for six positions ;
Figs. 7 to 14 shew diagrams of the arrangement for eight shuttle positions,
Figs. 15 to 19 shew diagrams of the arrangement for five shuttle positions, and
Figs. 20 to 23 shew diagrams of the arrangements for four shuttle positions.
The crank shaft a of the power loom drives by means of bevil gear a short
shaft a having a crank b which moves the lever d fixed to the shaft e (Figs. 7
and 3) which lever imparts an up and down motion by means of the rods to the
knife bars g g'. The pattern card Fig. 2 brings, according to whether it presents
a socket or a roller, the vertically arranged platinsk with their beaks i
in

page_text: front of the knife bars 9 g', which lay hold of them and carry them along. The
teeth of each platin take into a corresponding toothed segment ; the latter are
situated loose, side by side upon a fixed bolt on which they can turn.
The toothed segment / carries a circular eccentric m cast thereon which carries
an eccentric strap and is guided at the point o by the lever arm p pivotted on the
fixed pin y. In like manner the toothed segment A carries an eccentric m' cast
thereon, which has an eccentric strap and is guided at o' by the levers which is
Fivotted to the pin g carried by the first lever p
Also the toothed segment has a crank m², which is connected by the rod n to
the pin o² on the lever which is pivotted to a pin g' on the second lever s.
From the pin of levert the rod u passes to the pin of on the shuttle box
carrier, which is rigidly connected to the shuttle box w.
Each toothed segment
has a small groove for the reception of a brake strap which only has the object to
prevent any overrunning of the toothed platins during the motion.
On the shuttle box carrier is a short lever arin with which is connected the
spring Z the other end of which is connected to the loom frame.
According as the toothed platin & (Figs. 1 and 2) is moved up or down by the
reciprocating knife bars g g', the toothed segment with its eccentric me receives a
semi rotation either in the upward or the downward direction.
The eccentric strap which is guided at o rises or falls and with it the lever p
pivoted to the pin y, consequently the pin 7 serving as pivot to lever s also rises
and falls.
According as the second toothed platin is moved up or down by the
reciprocating knife bars g g', the second toothed segment and its eccentric m¹
receive a semi rotation in an upward or downward direction and the strap + which
is guided at o' rises and falls, as does also the second lever s pivotted to the
pin g.
According as the third toothed platin is moved up or down by the reciprocating
knife bars g g', the third toothed segment receives a semi rotation in an upward
or downward direction, while its crank m² receives a horizontal to or fro motion,
as does also, by means of the rod, the third lever t, which is pivotted to the
pin g¹.
As now, in consequence of the up and down motion of the two levers and s as
also of the pivot 9, the point receives four different positions in a vertical
direction, which are imparted to the lever pivotted at 9' and having a horizontal
to and fro motion, the point o will receive eight different positions which are
situated in a figure, similar to a rectangle. These eight positions appear at the
point o³ of the elbow levert as eight perfectly equal different vertical positions
which are situated alınost vertically one above the other.
The elbow levert consequently imparts by means of the connecting rod u, to the
point of of lever and consequently also to the shuttle box, eight perfectly equal
different vertical positions.
11
By suitably determining the stroke of the two eccentrics in m³ the pivot q¹ of
levers can in like manner receive only three positions in the vertical direction,
instead of four, which then give, in conjunction with the elbow lever t, at the
point o, six equal vertical positions so as to impart six corresponding positions to a
six-cell shuttle box, as indicated at Fig. 6.
By reducing the stroke of the crank m², two other positions in Figs. 15 and 16,
will be made to coincide thus producing a middle position, so that the elbow lever t
will have at point of five accurately equal vertical positions, as shewn at Figs. 15
to 19, while by farther shortening the lever of the eccentric m', the three positions
in vertical direction can be reduced to two, so that the point of of the lever t will
then only receive four accurately equal vertical positions, in which case the stroke
of the eccentric m is equal to zero, as indicated at Figs. 20 to 23.
All the movements of the eccentrics and cranks are closed, and are consequently
definitely prescribed motions, and the end positions are accurately fixed by the dead
centres thereof at each perfect semi revolution.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. A multiple shuttle changing device for eight or a less number of different
positions, consisting of three eccentrics or cranks, m m² m², carried on one and the
same shaft, of which the eccentric m actuates the lever p pivotted to the fixed
pin y, the eccentric m² actuates the lever s pivotted to a pin q on the lever p, and
the eccentric or crank m³ actuates the levert pivotted to a pin q' carried by levers,
the end pin o³ of the levert being made to actuate the shuttle box, substantially as
described.
2. An arrangement of the device referred to in the first claim, wherein, of the
eight different shuttle box positions, two positions are made to form a single one
either twice, thrice or four times in the cycle of movements, so that altogether,
there are only six, five or four different shuttle positions, substantially as herein
described with reference to Figs. 6, 15 to 19, and 20 to 23 of the drawings.
Dated this 20th day of December 1894.
ABEL & IMRAY,
Agents for Applicant.