Improvements in Dobby Mechanism of Looms for Weaving.
Year: 1894

page_text: Date of Application, 29th Dec., 1894
Complete Specification Left, 28th Sept., 1895-Accepted, 2nd Nov.; 1895
PROVISIONAL SPECIFICATION.
Improvements in Dobby Mechanism of Looms for Weaving.
We, RICHARD LONGDEN HATTERSLEY, of North Brook Works, Keighley, in
the County of York, Machine Maker, and SIMEON SCHOON JACKSON, of the
same address, Manager, do hereby declare the nature of this invention to be as
follows:-
:-
It relates to dobby mechanism of looms for weaving, and consists essentially in
the employment of two separate pattern cylinders for separately operating upon or
controlling double acting indicating levers or feelers; the operations of the pattein
cylinders being regulated or controlled by a supplementary cylinder carrying lags
or cards, which said cylinder also controls other parts for effecting this dual control
of the double acting indicating levers.
The healds being thus controlled by two separate pattern cylinders, we are
enabled to reduce the length of the pattern surface required for the production of
a given design, and also enabled to effect greater variations in the operations of the
healds.
In carrying into effect our invention, we construct and operate the diaw bars in
the usual manner, the diaw catches also being of the usual type. The indicating
levers, or the connecting lovers between the pattern cylinders and the draw catches,
are constructed and arranged as follows:
In connection with each draw catch, we employ a short supplementary pivotted
lever, one end of which is in contact with the draw catch, while the other end is
formed to carry a double acting indicating lever which is supported therefiom by a
hook joint on which the said double acting lever can oscillate.
The weight of the double acting lever causes the end of the supplementary leve
adjacent to the draw catch to Lise, thus keeping the draw catch clear of the
draw bar.
We
Beneath these double acting indicating levers, we mount the two pattern cylinders,
one to the night and one to the left, and at equal distances from the centres
also mount two fulcium iods beneath the same levers, beyond the pattern-cylinders,
but at equal distances from the centres, the pattein cylinders being thus mounted
between the centres of the levers and the fulcrum rods.
The pattern cylinders are intermittently revolved by pawls and catch wheels in
the usual way, but to each catch wheel there is provided a guaid plate for rendering
the pawls moperative. The guard plates are geared together, and are connected
by levers to the supplementary cylinder in such a manner that when the pawl of the
right hand cylinder is in operation with its catch wheel, the pawl of the left hand
cylinder is held out of operation with its catch wheel by its guaid plate, and
vice versa. The fulcrum rods of the double acting indicating levers are also
controlled by the supplementary cylinder, and are arranged to work in conjunction
with the operations of the pattern cylinders Assuming the night hand c) linder to
be in operation, the left hand fulcium rod will have been raised, and the right hand
fulerum od lowered, thereby inclining the double acting levels, so that the right
hand ends are in contact with the night hand pattern cylinder. At the next
operation of the supplementary pattein cylinder, the right hand fulcrum rod will
be raised and the left hand fulcrum rod lowered, thereby eliming the levers in the
opposite direction, so that the left hand ends are now u contact with the left hand

page_text: pattern cylinder which will at the same time he put into operation The presentation
of a peg on the pattern surface of either of the cylinders, raises the corresponding
indicating lever, so that the weight is taken off its supplementary lever, when, the
draw catch drops, and is moved by the draw bar.
As the cylinders and fulcrums are arranged at equal distances from the centres
of the double acting indicating levers, the movement of such levers at their centies,
or point of connection with the supplementary levers, 1s exactly the same whether
they are raised by the pattern surface of the tight, or the left hand cylinder.
Dated this 27th day of December 1894.
J. SIDNEY CRITCHLEY,
27 Kirkgate, Bradford, Agent for the Applicants.
Improvements in Dobby Mechanism of Looms for Weaving.
We, RICHARD LONGDEN HATTERSLEY, of North Brook Works, Keighley, in
the County of York, Machine Maker, and SIMEON SCHOON 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 descubed and ascertamed in
and by the following statement :-
It relates to dobby mechanism of looms for weaving, and consists essentially in
the cmployment of two separate pattern cylinders, for separately operating upon or
controlling double-acting indicating levers or feelers, the operations of the pattern
cylinders being regulated or controlled by a supplemental y cylinder carrying lags
or cards, which said cylinder also controls other paits for effecting this dual control
of the double-acting indicating levers
The healds being thus controlled by two separate pattern cylinders we are
enabled to reduce the length of the pattern surface required for the production of a
given design, and also enabled to effect greater variations in the operations of the
healds.
In order to fully explain our invention we append hereto sheets of drawings
marked with letters of reference, and in all the figures of such drawings like letters
denote like parts.
Fig. 1 represents in side elevation a loom dobby arranged according to our
invention;
Fig. 2 18 a plan of same;
Fig 3 is a sectional view showing the arrangement of indicating levers, draw bars,
and draw catches,
Figs. 4, 5, 6, and 7, are details hereinafter referred to.
In carrying into effect our invention, we employ the usual form of draw bars,
denoted by the letter A, which are mounted and operated in the usual way by the
double-armed pivotted lever B, actuated from one of the loom's main motor shafts.
The draw catches C are also mounted in the usual way and connected to levers D
operating the healds.
In connection with each draw catch, however, we employ a short supplementary
lever E pisotted on a centre e, one end of which is in contact with its draw catch.
The other end is formed with a cui ved nose e¹ and supports or carries a double-
acting indicating lever F, the form and shape of which is clearly shown in Figa 3
and 6 of the drawings. This lover is formed with a curved finger f, situated about
the centre, which hooks on the nose e¹ of the lever E, the lever F being thus fiee
to oscillate in either direction. The weight of the double-acting level F causes
the end of the supplementary lever E, adjacent to and in touch with the draw
catch, to rise, the diaw catches being thus kept clear from the draw bars, except at
the time when the weight of the levers F is taken off the levers E by the operations

page_text: Each
of either of the indicating peg cylinders G and Gas hereafter described
indicating lever F is formed so that it may be operated upon by either of the
indicating or pattern cylinders G and G'. These cylinders are mounted below the
said levers, one to the right hand and one to the left, and each at an equal distance
from the centre of the levers Fulcrum rods H and I are also mounted at the
underside of the loveis I beyond the cylinders G and G', and likewise at equal
distances from the centre line of the said levers which are curved downwards at each
end to partially encircle the said rods.
The pattern cylinders are thus nounted between the centics of the lovers Fand
their fulcrum rods H and H', the fulcrum rod II being employed when the
cylinder G is in operation, and the rod H' when the cylinder G¹ is in operation.
The indicating or pattein cylinders G and G'are intermittently rotated by pawls p
and piespectively, which are attached to arms connected to the pivotted lever B.
The pawls engage with catch wheels w, and w', attached to the shatts of the said
cylinders. The catch wheels to and to are provided with curved guard plates or
shields s and which are cared and oscillate on the shafts to which the catch
wheels are attached. These guard plates are geared together by means of toothed
segments and t, so that, when the guard plates uncovers the teeth of the catch
wheel w of the cylinder G, the guard plate si guards or covers the teeth of the
catch wheel to of the cylinder G' and vice-versa (see Figs. 4 and 5) A similar
allangement for gunding the teeth of a catch wheel from the operations of a pawl
is described in Specification of Letters Patent No. 1557 of 1894.
The guard plates is provided with an arm to which is attached a link coupled
to a lever J. This lever is controlled by the supplementary cylinder K, which is
intermittently rotated by means of a catch wheel and pawl, its pattern surface
operating upon leveis and which are connected by arms and 1³ with the
leve J. Thus a change in the pattern surface of the cylinder K effects a change
the operations of the cylinders G and G¹, by causing a movement of the guard
plates s and s', at one time allowing the pawl p to geal with the teeth of its catch
wheel w and guarding the teeth of the catch wheel to from the operations of its
pawl p, and, at another time uncovering the teeth of the catch wheel w', and
covering the teeth of the catch wheel w, first oue and then the other of the
cylinders G and G₁ being regulated to control the operations of the indicating
levers.
At the same time as a change is made in the operations of the cylinders Gand G¹,
it is necessary that the fulcrum on which the levers I work shall be changed also.
As before stated, the fulcrum rod H employed when the cylinder G is in
uperation, that is, the 1od Il acts as the centre or fulcium on which the indicating
levers work when movement is effected by the pattern su face of that cylinder.
The fulcrum rod Han like manner employed when the cylinder Ġ¹ 16 in
operation.
In order to change the fulcrum upon which the indicating levers F work, at the
same time as one cylinder ceases to rotate and the other is caused to rotate, the
said fulcrum rods are coupled together and raised and lowered by the pattern
surface of the supplementary cylinder K, that is, as the cylinder G is put into
operation, the fulcium rod His 1aised and the iod II lowered, so that the indicating
levers Fare in a suitable position for the operation of the cylinder G,-see Fig 3-
and as the cylinder G 18 put to operation the fulcium rod II is lowered and the
fulcium iod 11 raised, see Fig. 6. To effect this the fulcium red II' is carried
by two levers, the lever at one side of the dobby, and a lever L at the opposite
side, both levers being mounted on the shaft M The fulcrum rod His canned
by two levels J and L' mounted on a shaft M'. The levers L and L' aie bell
crank levels and are connected by au am N, as shown in Fig. 7, so that when n
movement of the lever J takes place owing to a change in the pattern surface of
the cylinder K a movement of the fulcrum rods Baud H' is also effected, one
being raised while the other is lowered.
It will be clearly seen by the diawings that, as the fulcium rods H and H' are

page_text: moved, the indicating levers F simply swing on the hook joint, and mcline one
way or the other according to which of the two cylinders G or G is put into
operation by the pattern surface of the cylinder K, no movement of the levers E
taking place until the pattern surface of the cylinder in operation indicates for
such a movement by its pattern surface, when one or more of the levers Fare
aised or lowered as the case may be In Fig 3 the levers are inclined so that
they bear upon the cylinder G so that the presentation of pegs effects a raising of
the levers which will work on the fulcrum iod fl The levels being thus
relieved of the weight of the levers F, the diaw catches are enabled to fall, in
which position they remain until agam raised by the presentation of a blank on
the pattern surface. This figure also shows one of the levers F raised by a peg,
and the corresponding diaw catch in contact with the draw bar.
Fig 6 shows the levers Finclined so that they bear upon the eylinder G, and
the employment of the fulcrum rod H. In this case the cylinder G' operates
the draw catches in exactly the same manner.
The fulcium rods H and II' when not employed as fulciums of centres for the
levers act as stops to prevent the said levers inclining to too great a degree and
bearing too heavily upon the pattern cylinders
The usual means are adopted for preventing the cylinders moving beyond a
certam distance at each operation of the pawls, so that the Hats are always brought
to exactly the same position. Provision is also made to keep the fulcrum 1ods H
and II perfectly steady For this purpose the lever J' is inade with an enlarged
boss having two concave surfaces corresponding to the two positions it occupies.
In one or the other of these concave surfaces, as the case may be, the circular end
of a lever P is pressed by a spring which is sufficiently strong to keep the various
parts in position, but allows movement when a chauge of the fulcium rods is
indicated.
Having now particularly descubed 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:
1. In dobby mechanism of looms for weaving, the employment of two pattern
cylinders G and G acting separately upon double-acting indicating levels F
carried by levels E supporting diaw catches, substantially as shown and
descubed.
2 In dobby mechanism of looms for weaving, the employment of levers E
supporting the draw catches C, and carrying double-acting indicating levers F,
pattern cylinders G and G' acting upon the indicating levers F, and the supple-
mentary cylinder K for regulating the operations of the cylinders G and G³,
substantially as shown and described.
3 In dobby mechanism of looms for weaving, the employment of two pattern
cylinders G and G₁ acting separately upon double-acting indicating levels F,
levers E supporting the draw catches C, the moveable fulcrum iods II and II',
and the supplementary cylinder K for regulating or controlling the operations of
the cylinders G and G' and the position of the fulcrum iods I and II', substantially
as shown and described.
4 1n dobby mechanism of looms for weaving, the employment of two separate
pattern cylinders G and G' acting separately upon double-acting dicating
Jeves F, levers E, the pawls p and paud catch wheels to and w₁ for actuating said
cylinders, the curved guard plates s'aud s' connected together by segments and t',
and the supplementary cylinder Kegulating the operations of the cylinders &
and G, substantially as shown and described.
5. In dobby mechanism of looms for weaving, the employment of two separate
pattern cylinders G and G¹operating separately upon double-acting indicating
levers F, levers E, pawls p and p', and catch wheels to and w' for actuating said
cylinders, the curved plates s and s connected by toothed segments t and t¹, the
moveable fulcrum rods II and H', and the supplementary cylinder K regulating

page_text: the operation of the cylinders G and G¹ and the position of the iods II and II',
substantially as shown and described.
6. In dobby mechanism of looms for weaving, the employment of double-acting
indicating levers F, carried or suspended at their centres by levers E supporting the
draw catches, substantially as shown and described.
7. A loom dobby arranged and constructed in the manner as herein described
and illustrated by the accompanying drawings
Dated this 24th day of September 1895.
J. SIDNEY.CRITCHLEY,
27 Kirkgate, Bradford, Agent for the Applicants.