Improvements in Appliances for Operating the Healds of Looms for Weaving.
Year: 1891

page_text: Date of Application, 12th Feb., 1891
Complete Specification Left, 12th Nov., 1891-Accepted, 12th Dec., 1891
PROVISIONAL SPECIFICATION.
Improvements in Appliances for Operating the Healds of Looms for
Weaving.
We GEORGE HERBERT HODGSON, Loom Maker, FRANK LEEMING, Manager
and WALTER TETLEY, Overlooker all of Laycocks Mill Bradford in the County
of York, do hereby declare the nature of this invention to be as follows:
--
This invention is designed for use in dobbies where the heavy ended or pattern
peg lever is so constructed as to operate either the top or the bottom catches;
part of the improvements being applicable to dobbies having ordinary catches
and single acting or ordinary heavy ended pattern peg levers, and the object of
the invention is by the use of improved appliances hereinafter described to ensure
the catches, racks and moving parts being placed and held in true position thereby
to ensure a full and open shed and to obviate, back lash or "winking up" that
is to say, waste or noneffective movement of the healds worked by dobbies as
now constructed and operated.
According to this our said invention, we form on each of upper and lower
catches, or on each catch and rack, two steps, shoulders or lugs. On the draw
knife is secured a broad and overhanging plate, above the catches is mounted,
on sector arms or cranks, a cross shaft, carrying a levelling bar.
The sector
arms or cranks, are actuated by a lever, from the ordinary rocking arm of the
dobby, and the upper and lower sectors, are by a link or rod, connected so as to
transmit motion.
In action-The return or "in" movement of the draw knife, will bring the outer
edge of its projecting plate, against the first step of the catches or racks, and
the whole will be forced back into true line. The cross bar of the sector arms
(soon as the catches to be drawn out have been selected and made a slight
movement) is brought, in front of the second step or lug, and holds the whole
of the remaining catches, levers, and healds absolutely steady.
The second lug, or a similar projection and sector arms or cranks, together
with cross levelling and holding bar, and connecting rods, may be applied to
existing dobbies, that is to say dobbies of ordinary construction.
Dated this 7th day of February 1891.
WALTER BRIERLEY,
Central Chambers, Halifax, Agent for the Applicants.
COMPLETE
SPECIFICATION.
Improvements in Appliances for Operating the Healds of Looms for
Weaving.
We GEORGE HERBERT HODGSON Loom Maker, FRANK LEEMING Manager
and WALTER TETLEY Overlooker all of Laycocks Mill, Bradford in the County
of York 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 is designed for use in dobbies where the heavy ended or pattern
peg lever is so constructed as to operate either the top or the bottom catches, part
of the improvements being applicable to dobbies having ordinary catches and single
acting or ordinary heavy ended pattern peg levers, and the object of the invention
is by the use of improved appliances hereafter described to ensure the catches,
racks and moving parts being placed and held in true position thereby to insure a

page_text: "
full and open shed and to obviate "back lash or "winking up" that is to say,
waste or noneffective movement of the healds worked by dobbies as now constructed
and operated the said improvements allowing both the top and bottom catches to
be free so that both, or either of them can be raised or lowered by the pattern
lever.
Such being the nature and object of our said invention the following is a
complete description of same reference being had to the accompanying drawings
forming a part of this Specification in which
Fig. 1 is a side elevation of part of a dobby having our improvements applied
thereto.
Fig. 2 is a sectional side elevation of part of our improved appliances drawn
detached in order to more clearly shew their construction and action.
Fig. 3 is a detail shewing one of the catches and racks drawn forward by the
draw bar or knife and another about to be slightly moved "in" and held in
position by the levelling bar.
Fig. 4 is a plan view of Fig. 1.
According to this our said invention we form on each upper and lower rack 1. 1.
two steps shoulders or lugs 2. 3. On each of the draw bars or knives 4. 4. is
secured a broad and overhanging plate 5 and above the upper racks 1 and below
the lower racks 1 we mount in the frame 6 of the dobby a cross shaft 7. 8 each
carrying a curved levelling bar 12. 12.
At one end of each shaft 7. 8 and outside the frame 6 of the dobby is fixed a
short sector arm or crank 9. 9. and these arms or cranks 9. 9. are connected to and
actuated by the connecting links or levers 10. 10 from the ends of the draw bars
or knives 4. 4. or from the ordinary T or rocking lever 11 so that as the latter
rocks to and fro in the well known manner motion is imparted to the levelling
bars 12 and their edges 13 are alternately brought up to and in contact with or
removed from the steps shoulders or lugs 3 on the racks 1. 1. so as either to hold
the latter in position or allow such as have engaged with the draw knives or
bars 4 to be drawn out afterwards holding such as have not been so operated upon
and slightly moving back or "in" the ends of the catches 14 from the propping
bars 15 so that the catches 14 are free and can be operated by the pattern peg
lever 16.
The action is as follows:-When the knives or draw bars 4. 4 are moving in the
direction indicated by the arrows that is the upper draw bar or knife is moving
"in" and the lower one "out" the lower bar or knife 4 will have taken hold of
such of the catches 14 as have been indicated by the pattern peg lever 16 and will
be drawing the same out at the same time the upper draw bar or knife 4 is by the
connecting rod or link 10 and crank or arm 9 giving a part revolution to the cross
shaft 8 the latter carrying round with it the levelling bar 12 so that its edge 13
will come in contact with the steps shoulders or lugs 3 on the lower racks 1 and
will hold such of them as have not been drawn out by the bar or knife 4 and by
pressing against the step or shoulder 3 a slight "in" movement is given to the
racks 1 sufficient to clear the ends of the catches from the propping bar 15 where
they have been forced by the weight of warps so that such catches remain free or
loose and offer no obstruction to the movement or operation of the pattern peg
lever 16.
"
As the draw bar or knife 4 moves " in the edge 17 of the broad plate 5 comes
in contact with the step shoulder or lug 2 on the racks 1 and so pushes back or
"in" the whole of the racks 1. 1. so that the dobby has a "positive" motion and
the broad plate 5 being above the draw bar or knife 4 sufficient space is left at 18
for the catches 14 to be raised so allowing the pattern peg lever 16 to move such of
the catches 14 as are required and as indicated by the pattern mechanism.
When "spring" dobbies are to be operated by our improved mechanism the
broad plates 5 may be dispensed with.
In Fig. 3 one upper catch 14 and rack 1 is shewn as being drawn "out" by the
draw bar or knife 4 and as these are drawn out the levelling bar 12 is by the

page_text: mechanism above described necessarily moved in the direction indicated by the
arrow, and the racks 1 and catches 14 not operated by the draw bar or knives 4
remain stationary, the ends of the catches 14 resting against the propping bar 15
until the edge 13 of the levelling bar 12 has cleared the step shoulder or lug 3 and
come in contact with the step shoulder or lug 3* of the rack 1 which has not been
drawn "out" by the knife or bar 4 and the edge 13 will press against such step
shoulder or lug 3ª and move the latter and the rack 1 and catches 14 slightly in
the "in" direction so clearing the ends of the catches from the propping bar 15
that the pattern lever 16 is allowed free movement and the levelling bar will hold
such racks 1 in the required position until a reverse movement of the T or rocking
lever 11 takes place when a like cycle of motions to the above described takes
place with the lower catches racks and levelling bar.
At 19. 19. are grates and steadying bars for ensuring the racks being held and
moved in correct line.
It will be obvious that the improvements can be applied to dobbies in which
ordinary or single pattern levers are employed that is a separate lever for the
upper and lower catches.
Having now particularly described and ascertained the nature and object of
our said invention and in what manner the same is to be performed we declare
that what we claim is :-
1. The racks 1. 1. having the steps, shoulders or lugs 2. 3 the curved levelling
bars 12. 12. links or levers 10. 10 and draw knives or bars 4. 4. having the
broad and overhanging plates 5 all in combination operated and operating as and
for the purpose herein set forth and substantially as illustrated by the annexed
drawings.
2. The racks 1. 1. having the steps shoulders or lugs 2. 3. the curved levelling
bars 12. 12. links or levers 10. 10. and draw knives or bars 4. 4. all in combination
operated and operating as and for the purpose herein set forth and substantially as
illustrated by the annexed drawings.
Dated the 11th day of November 1891.
GEORGE HERBERT HODGSON.
FRANK LEEMING.
WALTER TETLEY.
By their Agent, Walter Brierley,
Central Chambers, Halifax.