Improvements in Dobby-mechanism for Looms for Weaving.
Year: 1898

page_text: Date of Application, 28th May, 1898
Complete Specification Left, 1st Dec., 1898-Accepted, 14th Jan., 1899
PROVISIONAL SPECIFICATION.
Improvements in Dobby-mechanism for Looms for Weaving.
We, WILHELM REINERS, Engineer, of 18, Franzstrasse, and WILHELM OSCAR
SCHLAFHORST, Machine Maker, of 36, Wallstrasse, both of München-Gladbach,
in the German Empire, do hereby declare the nature of this invention to be as
follows:
The forms of shaft or dobby-mechanism for looms for weaving known by the
name of "swinging-cylinder" mechanism, consist essentially of a lever or frame
swinging to and fro about a pivot-pin or bolt and on which there are mounted,
for each shaft, two switch-tongues which are turned up or down by means of
bell-crank-levers operated by pattern-chains, and thus open an upper or lower
guide-groove for the roller on the jack or lever, so that the shaft is correspondingly
raised or depressed. The prisms or barrels carrying the pattern-chains swing to
and fro with the lever or frame and are turned through one division at each
oscillation, during which the switch-tongues are depressed or raised accordingly
as a large or a small roller on the pattern-chain lies under the bell-crank-levers.
This arrangement has the disadvantage that the pattern-chains are very expen-
sive, and, by reason of their great weight, can only have a limited length.
1.
In our improved dobby-mechanism, on the contrary, the operation of the
switch-tongue is effected by means of paper-cards, so that pattern-cards of unlimited
length can be employed. Moreover the easily-broken bell-crank-levers are en-
tirely dispensed with, so that the shaft or dobby-mechanism is considerably
simpler and at the same time far more useful than the forms of shaft or dobby
mechanism of a similar kind heretofore known.
The card-prisms in our improved mechanism, are arranged to move, and act,
in each of their forward motions, on pins which are arranged behind the switch-
tongues in such a manner that the said tongues are raised as soon as the corre-
sponding pins strike an unperforated part of the paper-card and are moved for-
ward in the further forward motion of the prism. If, on the other hand, the
pin strikes a hole in the card, it enters a recess in the prism and the switch-
tongue belonging to the pin remains in its lower position.
The movement of the card-prisms, which are mounted in guide-rods, is effected
by two cams which are mounted on a rotary driving-shaft and act against rollers
mounted on the guide-rods and thus alternately move the card-prisms outwards.
The prisms are then drawn in again by springs until they come into their end
position against adjustable stops so that the pressure of the springs is not taken
up solely by the paper-card, and the said card is relieved.
The rotation of the card-prisms is effected by Maltese crosses, which are rotat-
ably mounted on the shafts of the rollers above mentioned, and are turned through
one division by a pin mounted on one of the said cams in each revolution of the
driving-shaft. The motion of the Maltese crosses is transmitted by toothed-
wheels to the prisms which are locked in position after each rotation -by the

page_text: card-prisms outwards. The prisms are then drawn in again by springs R until
they come into their end position against adjustable stops U, so that the pressure
of the springs R is not taken up solely by the paper cards, and the said cards
are relieved.
The rotation of the card-prisms E is effected by Maltese crosses, W which are
rotatably mounted on the shafts of the rollers L and are turned through one
division by a pin Q mounted on the cam K in each revolution of the driving
shaft J. The motion of the Maltese crosses is transmitted, by toothed wheels z³,
2 to the prisms E which are locked in position after each rotation by the known
retaining springs which are not shown in the drawing. The rotation of the
driving shaft J is effected by toothed wheels z, 21, 22 from the main shaft of the
loom or other suitable source of power.
Instead of making the card-prisms movable, as above mentioned, they can also
be suspended by links or connecting-rods to the oscillating lever or frame A
so that they take part in the motion of that part, besides also performing alter-
nately a special forward and backward oscillation. The action of the card-
prisms is the same as in the first case.
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 :-
A swinging-cylinder shaft-mechanism or dobby-mechanism of the kind or
class hereinabove referred to, wherein movable paper-card prisms are mounted
on an oscillating lever or frame and, in the oscillating motion of the said lever
or frame, are reciprocated and act by means of pins on the switch-tongues, so
that these tongues are raised or depressed accordingly as imperforate or perforated
parts of the pattern or paper-cards running round the prisms engage with the
said pins, substantially as hereinbefore described.
1000
D. YOUNG & Co.,
11 and 12, Southampton Buildings, London, W.C.,
Agents for the Applicants.