Improvements in Dobbies of Looms for Weaving.
Year: 1894

page_text: Date of Application, 5th Feh., 1894
Complete Specification Left, 5th Nov.. 1894-Accepted, 8th Dec., 1894
PROVISIONAL SPECIFICATION.
Improvements in Dobbies of Looms for Weaving.
I THOMAS JAMES CROSSLEY of Middleton Junction near Oldham in the
County of Lancaster, Jacquard Machine Maker, do hereby declare the nature of
this invention to be as follows :-
This invention relates to that class of machines known as double lift dobbies,
wherein two pattern barrels are employed one to actuate the mechanism for the
ordinary longitudinal stripes of the cloth to be woven and the other for the cross
borders or patterns on handkerchiefs and other similar goods, at certain intervals
as required, and is designed to simplify the working parts of such apparatus and to
enable either barrel to be readily brought alternately into, or out of, contact
with its respective tumbling levers by means of a hand lever moved by the
operative.
According to my invention I mount on a suitable bracket fixed to the side frame
of the dobby a rocking lever, each end of which is provided with bearings
supporting a pattern barrel or cylinder around which the endless pegged lattice
is carried.
These barrels or cylinders are provided with the usual catch wheels which are
actuated by catch levers on either side.
To the centre of this rocking lever I fix a handle which hangs therefrom and is
connected thereto in such a way as to allow of a little lateral play as well as a
to-and-fro motion to be given to such handle, which is held in a slotted guide in
any position required by a spring catch attached to the lower end of the said
handle.
An important feature of the invention also consists in the peculiar form and
arrangement of the double tumbling levers which I propose to employ.
One of these levers is somewhat in the form of a bell crank with a curved short
arm, and the other lever is of an elongated form with a kind of swan or curved
neck and a vertical tail piece on which the vertical wires or needles rest in the
ordinary manner.
These tumbling levers are mounted on separate shafts or bars in the machine in
such a manner that the curved head of the swan neck lever, bears on the longer or
horizontal arm of the bell crank lever, so that the latter acts upon the former when
being tilted.
The needles or lifting wires bear or rest on the tail ends of the swan neck levers
which are passed through or between grids in the usual manner to guide and steady
them. A number of each of these levers are of course mounted upon their
respective bearings.
When it is required to weave (say on a right hand machine) the cross border
stripes on the cloth, the hand lever, connected to the aforesaid rocking lever on
which the pattern barrels are mounted, is pulled to the left, which tilts the barrel
up underneath the curved ends of the bell crank levers and are actuated thereby,
but when the ordinary longitudinal borders or stripes are required, the hand lever
is drawn in the opposite direction which brings the barrel underneath the swan
neck levers, and acts thereon until the necessary length is woven, and the operation
is again repeated when the next cross border is required to be woven.

page_text: Or the action of the above can be reversed when the dobby happens to be made
left handed.
Dated this 3rd day of February 1894.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.
DIBUITICATION.
Improvements in Dobbies of Looms for Weaving.
I THOMAS JAMES CROSSLEY of Middleton Junction near Oldham in the County
of Lancaster, Jacquard Machine 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 that class of machines known as "double-lift dobbies,"
wherein two pattern barrels are employed, one to actuate the mechanism for the
ordinary longitudinal stripes of the cloth to be woven, and the other for the cross
borders or patterns, on handkerchiefs and other similar goods at certain intervals
as required and it is designed to simplify the working parts of such apparatus,
and to enable either pattern barrel to be readily brought alternately into and out
of contact with its respective tumbling levers by means of a hand lever worked by
the operative.
The nature of my said invention will be readily understood on reference to the
annexed sheet of drawings marked with figures and letters of reference corresponding
with those in the following explanation thereof.
Fig. 1 on the annexed drawing is a side view of so much of a "double-lift
dobby" as is necessary to illustrate the application of my invention thereto, and
Fig. 2 is a vertical section of the same. a is part of the framing of the apparatus,
6 are the two "griffs" or knives and c c¹ the upper and lower griff catches.
According to my invention I mount on a suitable bracket d, fixed on the frame a
of the dobby, a rocking lever e, each end of which is provided with bearings
supporting a pattern barrel or cylinder ff¹ around which respectively the endless
pegged lattices g g' are carried.
These barrels or cylinders ff are provided with the usual catch wheels h h
which are actuated by catch levers i on either side (see Fig. 1).
To the centre of this rocking lever e I fix a handle k which hangs therefrom and
is connected thereto by a hinge (see also detached view Fig. 3) in such a way as
to allow of a small amount of lateral play, as well as a to-and-fro motion to be
given to such handle which is held in a slotted guide m in the position required by
a spring catch n (Fig. 3) attached to the lower end of the said handle. See also
detached plan view Fig. 3*.
P
An important feature of the invention consists in the peculiar form and
arrangement of the double tumbling levers which I propose to employ. One of
these levers o is somewhat in the form of a bell crank with a curved arm o¹, and
preferably a spur or tail piece o" to act as a counter-balance, and the other lever
with a kind of swan or curved neck p', and a tail piece for working the "griff"
catches in the ordinary manner. Each alternate lever p has a straight tail piece
upon which rests a needle r for working the upper griff catch c, and the tail
pieces p" of the intermediate levers p are turned up vertically to act direct on the
fower "griff" catches c¹.
When it is required to weave (say) on a right hand machine the ordinary cross
border stripes on the cloth, the handle k connected to the rocking lever e on which
the pattern barrels ff are mounted, is pulled over to the left (see Fig. 1), which
tilts the barrel underneath the curved arms o' of the bell crank levers o which are
actuated thereby; but when the ordinary longitudinal stripes are required the
j

page_text: handle k is drawn in the opposite direction which removes the barrel fout of action
and brings the barrel f underneath and in contact with the swan neck levers p,
and the pegs of its lattice g' act thereon until the necessary length of material is
woven, and the operation is again repeated when the next cross border is required
to be woven. Or, the action of the above can be reversed when the "dobby"
happens to be made left handed.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is :-
The improvements in "dobbies" of looms for weaving consisting in the
combination of mechanism substantially as hereinbefore described and illustrated
by the drawings annexed for working a double lift dobby with two pegged lattices
or chains for weaving cross stripes or borders; and especially I claim the
construction and action of the double tumbling levers o and p, and the double-
acting spring handle k for bringing either of the pegged lattices or chains g g¹ into
action.
Dated this 3rd dex of November 1801
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.