Improvements in Double Lift Dobbies for Looms.
Year: 1895

page_text: Date of Application, 25th Apr., 1895
PROVISIONAL SPECIFICATION..
Improvements in Double Lift Dobbies for Looms.
T
25
I, ROBERT LIVESEY, of the Firm of Henry Livesey Limited, of Greenbank.
Iron Works, Blackburn, in the County of Lancaster, Machine Makers, do hereby
declare the nature of this invention to be as follows:
In the dobby as at present constructed it is not usual to make it of a greater
capacity than 40 shafts and this invention is designed to provide a greater or
increased capacity to extend up to say 80 or so shafts without employing Jacquard
mechanism.
:
Two sets of jacks are placed in the frame one set above the other and two sets
of wires are connected thereto one set being placed, at one end of the frame and
the other at the other end of the frame the wires from the bottom set of jacks
passing up between the upper jacks to the lifting knives.
Each set of jacks and wires are provided with separate operating mechanism
of the ordinary construction the barrels or cylinders and lifting knives being
operated or set in motion in the usual way.
The two pairs of barrels or cylinders are geared or connected by a link
connecting rod or other suitable mechanism to a single operating lever so that they
work together each pair of cylinders being geared together as heretofore.
The top set of jacks are longer than the bottom ones to allow the heald cords to
work past the ends.
The lattices or chains of lags or the two central ones are placed upright instead
of horizontal the upper roller or cylinder over which the lattice passes being.
supported on an upright arm or bracket of suitable shape and construction.
At the sides of the frame adjusting screws are placed to adjust or regulate the
lateral position or movement of the jacks.
Dated this 24th day of April 1895.
WM. P. THOMPSON & Co.,
6. Bank Street, Manchester, Patent Agents.
Improvements in Double Lift Dobbies for Looms.
1, ROBERT LIVESEY, of the Firm of Henry Livesey Limited, of Greenbank
Iron Works, Blackburn, in the County of Lancaster, Machine Makers, 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 —
In the "Blackburn" dobby as at present constructed it has been found
impracticable to make it of greater capacity than 40 shafts and this invention is
designed to provide a greater or increased capacity without employing Jacquard
mechanism.
I find that by constructing the dobby with an additional set of cylinders
and lattices placed internally and an additional set of jacks placed above
the usual set and placing a set of lifting knives and wires in connection with the
jacks at each end of the frame I am enabled to double the capacity of the

page_text: doboy and increase the number of the shafts to 80 in same space as 40
previously,
The invention will be fully described, with reference to the accompanying
drawings.
Fig. 1. Side elevation..
Fig. 2. Longitudinal sectional elevation.
The frame or sides A of the dobby I construct with two upright or perpendicular
parts a each of which carries a pair of reciprocating knives B B' for operating
the wires or hooks D D by which the jacks C C are lifted. The jacks are
pivoted on rentres placed between the two uprights a. I employ two sets of
jacks C C the set C being placed above the set C' the top set of jacks C is
operated by the hooks or wires. D and knives B at one end of the frame and the
bottom set of jacks C' is operated by the hooks D' and the knives B' at the other
end of the frame. The hooks or wires D' which engage with the bottom jacks C¹
pass up between the upper jacks C to the lifting knives B' the upper jacks being
cranked to allow the wires to pass between them.
I employ four barrels or cylinders E, E, E" E, with corresponding
lattices F, F, F, F, making two sets of each for operating right and left hand
picks. The cylinders E' and E and the lattices F and F are placed in the
centre of the apparatus between the two pairs of knives and hooks and the central
lattices are stretched vertically in order to obtain the required amount of room
or space for them to work in. The lattices are stretched on two horizontal
notched brackets G, G¹ and on two vertical notched brackets H H¹.
The lattice motion is operated by a cranked lever K connected to the loom by a
connecting rod L each pair of cylinders being connected to move together and
work simultaneously by bars M M and a link N connects one pair of cylinders
with the other pair. The cylinders are caused to rotate at each movement
of the cranked lever K by the pawls or catches 0 0 engaging with the ratchet
or catch wheels o of the cylinders heing geared together in pairs by the spur
wheels e, e. The top set of jacks C are longer than the bottom jacks C to allow
the heald corde P to work past their ends and keep clear of the cords P. It will
be obvious that the invention may be applied to dobbies of the Keighley and
Yorkshire types in which lattices with two rows of holes to receive the pegs for
right and left hand picks are employed. In either of these cases two barrels can
be used with the two sets of jacks placed one above the other instead of the four
barrels herein before described.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. A dobby for looms constructed with two sets of jacks one set placed
above the other with corresponding lifting hooks and knives to increase the
capacity of the dobby without extending its dimensions laterally substantially as
described.
2. A dobby for looms constructed with two sets of jacks one set placed above
the other two sets of operating knives and lifting, hooks one,set at one end and
the other set at the, other end of the side or frame two pairs of barrels or
cylinders and two pairs of lattices the central ones being stretched vertically to
increase or double the capacity of the dobby without enlarging it laterally
substantially as described.
3. A dobby for looms having the several parts constructed and arranged in
combination substantially as and for the purpose described and shown.
WM. P. THOMPSON & Co.,
Manchester, Liverpool, and London, Patent Agents.