Improvements in Dobby Looms for Weaving.
Year: 1897

page_text: Date of Application, 29th Mar., 1897
Complete Specification Left, 29th Dec, 1897-Accepted, 12th Feb., 1848
PROVISIONAL SPECIFICATION.
Improvements in Dobby Looms for Weaving.
We, RICHARD LONGDEN HATTERSLEY, of North Brook Works, Keighley, in the
County of York, Machine Maker, and SIMEON JACKSON, of the same address, Manager,
do hereby declare the nature of this Invention to be as follows:-
66
"
This invention relates to improvements in that class of weaving looms in which the
shedding of the warp is effected by what is commonly termed a ' dobby.'
When the draw hooks of a double lift dobby engage with one of the draw knives
and are "drawn" or operated the ends of the balks to which the hooks are attached
describe a curve or move in a curved path and rise and fall as the case may be accord-
ing as to whether the lower or upper end of the balk is operated and consequently the
hooks do not remain in line with the direction of motion which causes unnecessary
friction and loss of power.
To obviate this as much as possible we incline the upper and lower guides in which
the draw knives work towards each other sufficiently to raise the lower knife and
lower the upper ones as the hooks are operated and thus keep the hooкs practically
horizontal or in line with the direction in which they are moving.
A further advantage in respect to ease of working and to keeping the draw hooks in
line is attained by arranging the fulcrum of the jack levers or bell-crank levers in the
same plane as the centre of attachment of the hooks to the balk levers when the latter
are not "lifting" and by arranging the centre of attachment of the balk levers to the
jack levers in such a position in relation to this plane that when operated they
oscillate between two points located equidistant from each side of the plane.
In order to some extent combine the pick stopping and card reversing mechanism
and enable them to be operated by the same operating rod we introduce levers into
the respective motions arranged in such a manner that on the first movement of the
operating rod the said lever in the pick stopping motion is in its most active position
that is to say its arm communicating the motion is moving in a direction almost
parallel to the direction of motion so that the pick stopping mechanism is
immediately actuated. On the other band the said lever in the card reversing
mechanism is at first in its most passive position and at first the arm communicating
the motion move approximately at right angles to the direction of motion and only
passes into an active position after the picking motion has been stopped.
In looms in which the shuttle box changing cylinder is upon the same shaft as the
dohby cylinder and is operated at the same time the indication imparted to the box
motion is required to be some degrees later than the indication imparted to the healds.
To obtain this we make use of compound levers for the box indicating lags each con-

page_text: sisting of a simple lever and having an arm on either side of its fulcrum one of
which is arranged to be engaged by the lag pegs and the other projects over one arm
of a second simple lever, the other arm of which controls the box indicating
mechanism. Each of the second simple levers is formed with a slot through which
the fulcrum rod passes and it is normally supported with the bottom of the slot up
against the under-side of the fulcrum rod by means of a spring which may be
immediately above said rod. These slots are sufficiently long to allow the simple
levers to be operated by the lag pegs which only has the immediate effect of depress-
ing the ends of the second levers nearer to them without operating the other end as
the said slots are provided to allow this. When this takes place the box indicating
levers are prevented from being lifted by a detent or stop piece which is removed at
the time the indications are required to be made this allows the said springs to lift the
ends of such of the second simple levers that have their opposite ends depressed by
the first simple levers and this movement is imparted in any convenient way to the
box indicating levers connected to the box motion.
We preferably employ metal lag pegs formed of double wire of suitable section to form
a fairly round peg. The crown or bent end of the peg is passed through the lag from
behind and to keep it from working out the ends of the double wire are bent outwards
to form a head, and a recess is formed in the lags to receive such head. The double
wire is preferably hardened and tempered so that the sides may be sprung together
to facilitate passing it through the lag and they may be slightly bellied or bowed out-
wards about the middle so as to bear tightly in the holes through the lag at the acting
face.
improvements in Dobby Looms for weaving.
We, RICHARD LONGDEN HATTERSLEY, of North Brook Works, Keighley, in the
County of York, Machine Maker, and SIMEON JACKSON, of the same address, Manager,
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 improvements in that class of weaving looms in which the
shedding of the warp is effected by what is commonly termed a "dobby."
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When the draw hooks of a double lift dobby engage with one of the draw knives
and are "drawn or operated the ends of the balks to which the hooks are attached
describe a curve or move in a curved path and rise and fall as the case may be
according as to whether the lower or upper end of the balk is operated and con-
sequently the books do not remain in line with the direction of motion which causes
unnecessary friction and loss of power.
To obviate this as much as possible we incline the upper and lower guides in which
the draw knives work towards each other sufficiently to raise the lower knives and
lower the upper ones as the hooks are operated and thus keep the hooks practically
horizontal or in line with the direction in which they moving.
A-further-advantage-in-respect-to-ease-of-working-and-to-keeping the draw-books
in-line-is-attained-by-arranging the fulerum-of-the jack-levers or bell-crank-levers
in-the-same-plane-as-the-centre of attachment of the hooks-to-the-balk-levers--when
the--letter-ure-not "lifting-and-by arranging the centre of attachment-of-the-balk
levers to the-jack levers-in-such-a-position-in-relation-to-this-plane--that when

page_text: operated-they-oscillate-between-two-points-located-equidistant-from-each-side-of-the
plane.
In order to enable the pick stopping and card reversing mechanism to be operated
by the same operating rod we introduce levers into the respective motions arranged
in such a manner that on the first movement of the operating rod the said lever in
the pick stopping motion is in its most active position that is to say its arm com-
municating the motion is moving in a direction almost parallel to the direction of
motion so that the pick stopping mechanism is immediately actuated. On the other
hand the said lever in the card reversing mechanism is at first in its most passive
position and at first the arm communicating the motion moves approximately at right
angles to the direction of motion and only passes into an active position after the
picking motion has been stopped.
In looms in which the shuttle box changing cylinder is upon the same shaft as the
dobby cylinder and is operated at the same time the indication imparted to the box
motion is required to be some degrees later than the indication imparted to the healds.
To obtain this we make use of compound levers for the box indicating lags each
consisting of a simple lever and having an arm on either side of its fulcrum one of
which is arranged to be engaged by the lag pegs and the other projects over one
arm of a second simple lever, the other arm of which controls the box indicating
mechanism. Each of the second simple levers is formed with a slot through which
the fulcrum rod passes and it is normally supported with the bottom of the slot up
against the under-side of the fulcrum rod by means of a spring which may be
immediately above said rod. These slots are sufficiently long to allow the simple
levers to be operated by the lag pegs which only has the immediate effect of depressing
the ends of the second levers nearer to them without operating the other end as the
said slots are provided to allow this. When this takes place the box indicating levers
are prevented from being lifted by the ordinary detent or stop piece which is removed
at the time the indications are required to be made this allows the said springs to
lift the ends of such of the second simple levers that have their opposite ends
depressed by the first simple levers and this movement is imparted in any convenient
way to the box indicating levers connected to the box motion.
To fully describe our invention reference is made to the accompanying sheets of
drawings forming a part of this specification, in which similar letters of reference
indicate corresponding parts in each of the figures.
Figure 1, represents an elevation looking towards the front of the loom of
such parts of a dobby as are necessary to illustrate the application of our improve-
ments.
Figure 2, is a separate view of one of the jack levers together with its balk lever
and hooks.
Figure 3, is an end view of Figure 1 together with certain other parts.
Figures 4 to 9, are views of details hereinafter referred to.
The upper guides A, A in the side frames A2 of the dobby in which the knives As
work are inclined down towards the lower knife guides A4, A* consequently as the
hooks B, B move backward and forward their ends B2, B3 are kept more in line with
their centres of attachment B to the balks B5.
The parts are so relatively arranged that when they are not operated by the
knives-the-fulerum-B of the jack lovers--B-is--vertically--beneath--the--centres--of
attachment-B-of-the-books-B-os-shown by-the-broken line a, b Figure 2. And
the-centre of attachment-BB-of-the-balk-B-to-the-jack-lever Blies, before--the
jack-lever-is-moved.-such-a-distance-from-the-line-a;-b-that-when said lever-is-fully
operated--it--passes-to-a-position-equidistant-from-said-line-but-on--the--opposite
side.
The pick stopping and card revolving mechanism are under the control of one
rod C (shown broken away in Figure 1) but in reality the end C² reaches approxi-
mately to the other side of the loom and one of its notches C3, C4, or C³ rests upon
the stud C fixed at the other side of the loom to support it. The other end of the
rod is connected to an arm D on the rocking shaft D* mounted on bearings formed

page_text: in the framework A². This shaft D has arms D³ and D* fixed upon it in such a
position that when the notch C³ is engaging the stud C6 the arm D³ is nearly
horizontal and the arm D is nearly vertical in the position shown in Figure 1.
When the rod C is moved to bring the notch C4 on to the stud C the arms D³ and D
are brought to the position shown in Figure 4, and as when moved in this way the
arm D³ is nearly at right angles to the rod E connecting it to the pick stopping
mechanism this rod has sufficient movement imparted to it to throw the picking
motion out of operation.
On the other hand the arm D¹ merely passes over the
dead centre or moves practically parallel to the rod F which connects it to the card
reversing mechanism, consequently the longitudinal mot.on imparted to the rod is
But when the
so slight that it has no effect on the card reversing mechanism.
notch C of the rod is passed on to the stud C the arm D4 is brought to the
position shown in Figure 5 and the rod F is moved sufficiently to move the clutch
lever F2 from the position shown in Figure 3 to that shown in Figure 9.
To permit the dobby cylinder G to be operated at the same time and to be
mounted on the same shaft G2 as the shuttle box changing cylinder H and allow
the lag pegs H2 on the latter to be brought into effect slightly later than the pegs,
bowls or their equivalent on the dobby cylinder we employ compound levers for
These levers each
operating the rods J connected to the box motion levers J².
consist of two simple levers Ĺ and K. The levers K are pivoted side by side on the
pin or shaft K³ and one arm K* of each lever projects over the shuttle box changing
cylinder H whilst the other projects over the arm L2 of the lever L. Figure 6,
represents a side view of the levers when the lever K is not lifted and Figure 7,
represents a similar view with the lever lifted by a peg H2. The levers L are mounted
upon a fulcrum rod L³ by their slots Land when the levers K are not lifted the
springs L hold the levers L with the bottom of their slots L4 touching the under-
side of the red L³. When however a lever K is lifted the lever L in contact with it
is depressed as shown in Figure 7 consequently tension is put upon the spring and
when the ordinary detent lever J³ releases the box motion lever J2 connected to the
particular lever L under mention by its rod J the spring L³ contracts and lifts the
lever L within the limits allowed by the slot L and thereby raises the rod J and
the box lever J2 connected to it.
Figure 8, shows the lever J³ engaging the box motion lever J2.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what
we claim is :-
1. A dobby in which the knife guides are inclined towards each other, substantially
as herein shown and described.
2. A-dobby which, when the jack-levers are not "lifting," has the fulcrum of the
bell-erank-levers in-the-same-plane-as-the-eentres-of-eennection-of-the-hooks-to-the
balk-lovers,-and-in-which-the-centre of connection of-the-balk-levers-to-the-jaek
levers-is-in-such-a-position-that-in-the-movements of the latter-such-centre passes
cquidistant--on--each-sids--of the-said-plane, substantially as herein shown-and
described.
2. 3. The combination of the rod C having a notched end adapted to be supported
by one of such notches and the rocking shaft D2 having arms D, D³ and D
substantially as herein shown and described and for the purpose specified.
3. 4. The combination of the levers K and L arranged and operating substantially
as herein shown and described, and for the purpose specified.
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