Improvements in or appertaining to Shedding and Change-box Mechanisms of Looms for Weaving.
Year: 1894

page_text: Date of Application, 26th Jan., 1894
Complete Specification Left, 25th Oct., 1894-Accepted, 1st Dec., 1894
Improvements in or appertaining to Shedding and Change-box
Mechanisms of Looms for Weaving.
We, CHARLES HUDSON, of 10 Ashgrove, Ingrow, near Keighley, in the County
of York, Weaving Overlooker, and GEORGE HERBERT HODGSON of Kirkfield,
Baildon, in the County of York Loom Maker do hereby declare the nature of this
invention to be as follows:-
-
This invention relates to shedding and change box mechanisms of looms for
weaving, and consists, firstly, of improvements in connection with an invention for
which Letters Patent, No. 935, of 1889, was granted to Frank Leeming and
Robert Wilkinson; the object of my invention being to render the mechanism
therein described more effective and reliable than has heretofore been the case.
In a positive dobby arranged and constructed according to the above Patent, it
frequently happens that the draw catches do not fall clear of the draw bars, and
the said draw catches being held or propped up by the stop pieces, the advancing
draw bars break them. The reason why such draw catches do not always drop the
requisite distance, to allow for the clear passage of the draw bars, is attributable,
among other causes, to the wearing of the pegs of the patteru lags, or occasionally,
one tumbler lever may be partially held or jambed by one of the other tumbler
levers which in turn affects it corresponding draw catch.
In order to overcome this difficulty or defect; we arrange such dobby
mechanism with a greater distance between the draw bars and their respective
stop pieces, and construct the draw catches with an elevated circular portion
beyond the holding notches, when, in the event of a draw catch not falling the
requisite distance to allow for the clear passage of the draw bar, the draw catch is
either pushed down by, or carried forward with, the draw bar, but not in any case
will breakage of the draw catch ensue.
The second part of our invention relates to change box mechanism of looms for
weaving, and consists in the application of, and peculiar means of driving an open
shed dobby to the controlling of or indicating the shuttle box motion, which is
effected as follows:-
On the dobby cylinder shaft, we mount the additional cylinder carrying pattern
lags, for controlling or regulating the movements of tumbler levers and draw
catches of an open shed dobby, such draw catches being connected to rocking
bars, levers, and other parts necessary for controlling the mechanism for effecting
the changes of the shuttle boxes.
The draw bars of the dobby work in guides, and to each bar, we attach a bowl,
each bowl being operated upon by a double winged tappet attached to a vertical
shaft, whereby the movement of the draw bars and catches selected by the pattern
lags is effected; while, springs attached to the various parts bring them into their
normal positions after each operation, and stop pieces are provided, into which the
draw catches fall when not held up by the draw bars.
The vertical shaft, carrying the tappets, is intermittently rotated by means of
suitable gearing from any convenient part of the loom, but preferably in the
manner hereafter described, and the tappets actuating the draw bars are shaped
so that the movement of the shuttle box is effected at the proper time irrespective
of the operation of the shedding mechanism.

page_text: Specification of Letters Patent, No. 16,110, of 1886, granted to Frank Leeming,
describes mechanism "for operating the rising and falling of shuttle boxes of looms
for weaving," and in applying these improvements to such mechanism; we couple
the rods from the dobby levers to the clutch forks of such mechanism, and also
intermittently rotate the vertical shaft, carrying the tappets for operating the
draw bars, from the centre barrel by means of a star wheel and bevel gearing.
The dobby is also provided with an additional tumbler lever, draw catch, and the
requisite levers, for the purpose of operating a clutch fork controlling the segment
wheel, which moves the star wheel connected with the picking motion; thereby
effecting direct control of the picking motion from the pattern lags.
Dated this 23rd day of January 1894.
J. SIDNEY CRITCHLEY,
27, Kirkgate, Bradford, Agent for the Applicants.
Improvements in or appertaining to Shedding and Change-box
Mechanisms of Looms for Weaving.
We, CHARLES HUDSON, of 1, Haincliffe Road, (late of 10 Ash Grove), Ingrow,
near Keighley, in the County of York, Weaving Overlooker, and GEORGE
HERBERT HODGSON, of Kirkfield, Baildon, in the County of York, Loom
Maker, 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 :-
This invention relates to shedding and change box mechanism of looms for
weaving, and consists, firstly, of improvements in connection with an invention, for
which Letters Patent, No. 935 of 1889, were granted to Frank Leeming and
Robert Wilkinson, the object of our invention being to render the mechanism,
therein described, more effective and reliable than has heretofore been the case.
In a positive dobby, arranged and constructed according to the before named
Patent, it frequently happens that the draw catches do not fall clear of the
draw bars, and the said draw catches, being held or propped up by the stop
pieces, the advancing draw bars break them. The reason why such draw
catches do not always drop the requisite distance to allow for the clear passage
of the draw bars is attributable, among other causes, to the wearing of the
pegs of the pattern lags, or occasionally one of the tumbler or heavy ended
levers, may be partially held up or jambed by one of the other tumbler levers,
which in turn affects its corresponding draw catch.
In order to overcome this difficulty we arrange such dobby mechanism with
a greater distance between the draw bars and their respective stop pieces, and
construct the draw catches with an elevated circular portion beyond the holding
notches, when, in the event of a draw catch not falling the requisite distance
to allow for the clear passage of the draw bar, the draw catch is either pushed
down by, or carried forward with the draw bar, but not in any case will
breakage of the draw catch ensue.
Sheet 1, of the appended sheets of drawings illustrates this first part of our
invention.
Fig. 1 of such drawings, is a side view of certain parts of a dobby arranged
and constructed according to the before named Specification, with my improved
draw catch.
Fig. 2, is a similar view showing the draw catch as hitherto constructed
and arranged.
Fig. 3 is a full sized elevation of our improved draw catch.

page_text: Referring to the drawings, the draw catch 1 is attached, as described in the
before named Specification, to the rack 2.
The draw catch is operated by the draw bar 3, and 4 is the usual stop
piece.
With the exception that a greater distance is made between the draw bar 3,
and the stop piece 4, the arrangement of parts in Fig. 1 is identical with the
arrangement of parts in Fig. 2. The draw catch 1 however, of Fig. 1 shown
in full size by Fig. 3 is constructed with an elevated portion beyond the
holding notch a, so that in the event of the catch not falling the requisite
distance to allow for the clear passage of the bar 3, the draw bar will either
push down the catch or draw it along over the top of the stop piece i, but
in no case can the catch be broken, as would happen if the catch and stop
piece were arranged as shown in Fig. 2, wherein the catch (shown as hitherto
constructed) has not fallen the requisite distance for the clear passage of the
advancing draw bar.
The second part of our invention relates to change box mechanism of looms
for weaving, and consists in the application of, and peculiar means of driving
an open shed dobby, to the controlling of, or indicating the shuttle box motion,
which is effected as follows:
On the dobby cylinder shaft, we mount an additional cylinder carrying pattern
lags for controlling or regulating the movements of tumbler levers and draw
catches of an open shed dobby. The draw bars of the dobby work in guides, and
to each bar we attach a bowl, each bowl being operated upon by a double winged
tappet attached to a vertical shaft, whereby the movement of the draw bars and
catches selected by the pattern lags is effected.
The vertical shaft, carrying the tappet, is intermittently rotated by means of
suitable gearing from any convenient part of the loom, but preferably in the
manner hereafter described.
Specification of Letters Patent, No. 16110 of 1886, granted to Frank Leeming
"describes mechanism for operating the rising and falling of shuttle boxes of
looms for weaving," and in applying these improvements to such mechanism, we
intermittently rotate the vertical shaft carrying the tappet from the centre barrel
of such mechanism by means of a star wheel and bevel gearing, and also couple the
rods from the dobby levers to the clutch forks of such mechanism.
The dobby is also provided with an additional tumbler lever, draw catch, and
the requisite levers for the purpose of operating a clutch fork controlling the
segment wheel, which moves the star wheel connected with the picking motion, as
described in the before named Specification.
In order to fully describe this second part of our invention, three sheets of
drawings are appended, numbered 2, 3, and 4.
Referring to these sheets of drawings:
Fig. 4 of same, is an end view of a loom showing Leeming's mechanism for
operating the rising and falling of shuttle boxes of looms for weaving with our
open shed dobby for controlling such mechanism, attached, Fig. 5, is a back view
of the same.
Fig. 6 is a sectional back elevation of the dobby, drawn to a larger scale.
Fig. 7 is a sectional front elevation of same without the tumbler levers, draw
catches, rocking bars and connecting levers,
Fig. 8 is a plan of the dobby, and
Fig. 9 is a detail sbowing the construction and arrangement of the draw bars.
On the ordinary dobby cylinder shaft 6, driven by the usual gearing from a
vertical shaft 7, we mount an additional pattern cylinder 8, carrying pattern lags 9,
for the purpose of controlling the tumbler levers 10, and draw catches 11 of an
open shed dobby. This dobby is provided with five sets of tumbler levers, draw
catches, rocking bars, and connecting levers, four sets controlling the shuttle box
mechanism, two for either side of the loom, and one set for controlling the picking
motion.

page_text: The tumbler levers 10 are pivotted on a stud fixed to the dobby frame 12, which
is supported by the loom's framework, and the draw catches 11 are pivotted on
pins 13, attached to rocking bars 14. These pins 13 are cast with the rocking
bars 14, the ends of which are forked for the reception of the draw catches, as
shown in Fig. 6. The pins 13, are formed with two flat sides, so that the catches 11
can only be detached by turning them into a vertical position. This arrange-
ment is described in Leeming and Wilkinson's Patent, No. 935, of 1889. Each
rocking bar 14 is pivotted on a pin of a connecting lever 15, carried by a stud 16,
fixed to the dobby frame. The connecting levers 15 are forked at their upper ends
for the reception of the rocking levers 14.
The lower ends of the indicating levers 15 may be formed with double ends
after the fashion of bell crank levers, so that rods connected to the shuttle box
mechanism may be taken from any indicating lever to either side of the loom, the
vertical lever being used for the connection of the shuttle box mechanism at the
contrary side of the loom to which the dobby is fixed.
The draw bars 17 are fixed to plates 18, to which bowls 19 are attached, and
each bowl is operated upon by a double winged tappet 20, by which means each
plate and draw bar 17 is alternately drawn forward. The plates 18 are carried
and guided by the dobby frame, which is slotted at 21 therefor, through which
slots pass short arms 22 (see Fig. 8). To these arms, a coiled spring is attached,
so that after each operation of the tappet, the bars 17 are pulled back to their
normal position. On to the face of the dobby frame, we bolt a plate 23 which not
only keeps the draw bar plates 18 in position, but also forms a grid or guide 24 for
the draw catches 11, and stop pieces 25 for the rocking bars 14. The tappet 20,
is carried and revolved by a shaft 26, which is intermittently rotated from
any convenient part of the loom, but preferably in the manner shown by the
drawings.
وو
Referring to Figs. 4 and 5 of Sheet 2 of the drawings: The indicating
levers 15, are shown coupled up to the forks. 27 and 28 controlling the two movable
segment wheels 29 and 30 of Leeming's mechanism, "for operating the rising and
falling of shuttle boxes, and controlling the picking motion of looms for weaving,"
and the vertical shaft 26, is intermittently rotated from the centre barrel 31 of
such mechanism, by means of a star wheel 32, and bevel gearing 33. The
connecting levers 15, are coupled to the forks 27 and 28 by means of rods 34 and 35,
and arms 34 and 35°, and springs are attached to the arms 34 and 35* whereby
the rocking bars 14 are brought against the stop pieces 25, and the various other
parts to a normal position after each operation of the draw bars 17.
The tappet 20, actuating the draw bars 17, is so formed that one of its wings is
always in contact with one or other of the bowls 19, whereby the draw bar which
is in its forward position is kept in contact with the notches of the draw catches,
until the draw bar, which is being drawn forward, has taken hold of the notches of
its draw catches, whereby, any unnecessary movement of the various parts of the
dobby is obviated, and complete rigidity of its parts maintained during all its
operations.
In connection with the motion for controlling the picking motion, the set
of tumbler levers and other parts, are connected by a rod 36, to the clutch
fork 37, controlling the segment wheel 38 as described in the before named
Specification.
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:
1st. In positive dobbies of looms, a draw catch having an elevated portion b,
beyond the holding notch a, substantially in the manner as shown and described
and for the purpose herein set forth.
2nd. In looms for weaving, the application of an open shed dobby for controlling
the shuttle box mechanism, such dobby having its pattern cylinder on the same

page_text: shaft as the ordinary dobby cylinder controlling the healds, and having draw
bars 17 actuated by means of a double winged tappet 20 which is intermittently
revolved by a vertical shaft 26, all substantially as shown and described.
Dated this 24th day of October 1894.
J. SIDNEY CRITCHLEY,
27, Kirkgate, Bradford, Agent for the Applicants.