Improvements in Loom Dobbies.
Year: 1889

page_text: Date of Application, 1st Feb., 1889
Complete Specification Left. 1st Nov.. 1889-Accepted. 14th Dec., 1889
PROVISIONAL
SPECIFICATION.
Improvements in Loom Dobbies.
We, JOHN LEEMING and JOHN ARTHUR LEEMING both of Kirklands, Baildon, in
the County of York Machine Makers, do hereby declare the nature of this invention
to be as follows :-
This invention relates to apparatus for operating the healds of looms for weaving,
and consists of an improved construction, arrangement, and combination of parts
whereby the needles are dispensed with, and direct action of the hooks or catches upon
the jack levers is ensured without the intervention of "baulk" levers the upper and
lower hooks or catches being connected by means of a cord or a chain and a pulley,
the catches having either independent or joint action so that the hoalds may remain
up or down any number of picks until a change is indicated by peg or card mechanism.
Apparatus for purpose aforesaid according to this our invention comprises the
ordinary T or rocking lever and draw bars the upper and lower catches being con-
nected by a free joint to a link or bar the other ends of said links or bars being
connected by means of a cord or chain passed over a chain or pulley applied to the
upper arm of the jack lever.
The links referred to work through gratings and serve to keep the catches in
proper position they also determine the degree the healds are lowered or pulled down.
The arrangement of parts as described admits of the catches and gratings being
brought so nearly together that needles are dispensed with, there being simply a
projection or finger on the tumbler lever which operates the upper catches, or the end
of the tumbler lever is slightly bent upwards.
Dated this 31st day of January 1889.
WALTER BRIERLEY,
Town Hall Buildings, Halifax, Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Loom Dobbies.
We JOHN LEEMING and JOHN ARTHUR LEEMING, both of Kirklands, Baildon in
the County of York 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 :-
This invention relates to apparatus for operating the healds of looms for weaving
and consists of an improved construction, arrangement and combination of parts
whereby the needles are dispensed with, and direct action of the hooks or catches upon
the jack levers is ensured without the intervention of "baulk" levers, the upper and
lower hooks or catches being connected by means of a cord or a chain and a pulley,
the catches having either independant or joint action so that the healds may
remain up or down any number of picks until a change is indicated by peg or card
mechanism.
Apparatus for purpose aforesaid according to this our invention comprises the
ordinary T or rocking lever and draw bars the upper and lower catches being
connected by a free joint to a link or bar the other ends of said links or bars
being connected by means of a cord or chain passed over a pulley applied to the
upper arm of the jack lever.
The links referred to work through gratings and serve to keep the catches in
proper position they also determine the degree the healds are lowered or pulled
down. The arrangement of parts as described admits of the catches and gratings

page_text: being brought so nearly together that needles are dispensed with, there being simply
a projection or finger on the tumbler lever which operates the upper catches, or the
end of the tumbler lever is slightly bent upwards. 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 our improved dobby, or mechanism for
operating the jack, or shedding levers, and shewing the jack, or shedding lever
" down.'
-
Fig. 2. is a similar view to Fig. 1. but shewing the jack, or shedding lever " up."
Fig. 3. is a side elevation, partly in section, of the grate for steadying, and
supporting the draw hooks, and tumbler levers.
Fig. 4. is a front elevation of a part of such grate.
Figs. 5 and 6 are views of the joint or means of connecting the links, or bars,
and draw hooks.
The remaining Figs. on sheets 3 and 4 are details drawn about full size.
According to this our said invention the draw bars 1. 1. are operated in the usual
manner by the T, or rocking lever, and the upper, and lower catches, or draw
hooks 2. 3. are connected by a free joint 4 to a link or bar 5. the other ends of the
said links, or bars 5. being connected by means of a cord, or chain 6 which is passed
over a pulley 7. carried on the upper arm 8 of the jack or shedding lever 9. The
links, or bars 5. referred to work through gratings 10 over which gratings are
held the detachable flat bars 11; such gratings 10 and bars 11 serve to keep the
catches or draw hooks 2. 3. in correct working position, they also determine the
degree the healds, are moved by acting as stop pieces (in an open shed dobby) for
the draw hooks, or catches 2. 3. the joints 4 of which come in contact therewith.
The above described arrangement of parts admits of the upper, and lower draw
hooks, or catches 2. 3 and gratings 10 being brought so nearly together that noodles
are altogether dispensed with; there being simply an enlongated finger 12 on the
tumbler lever 13 for operating the upper draw hooks, or catches 2 while the tumbler'
lever 14 for operating the lower catehes 3 is formed as ordinary-or the two tumbler
levers 13, 14 can be cast as one lever 14 (see sheet 3) having two fingers 12. 15.
in which case the top draw hook 2 is slightly bent as shewn so as to rest on the top
of the finger 12.
In Figs. 3 and 4. are illustrated a form of grating suitable for steadying, and
keeping in their correct working position the draw hooks or catches 2. 3 and the ends
or fingers 12. 15 of the tumbler levers the slots 16 in the top part of the grating,
being over or opposite the solid part 17 of the bottom of the grating and vice versa,
this ensures the top draw hook 2 being a little on one side i.e. not directly over the
bottom draw hooks 3, and so allows the tumbler lever to act direct on their respective
draw hooks.
The draw hooks 2 are connected to the link or bars 5 by a joint (see Figs. 5. 6)
which permits of them being readily detached, or attached, the end of the draw
hook 2 having a semicircular recess 18 which is received on a stud 19 on the end
of the link 5, a pin 20 preventing the semicircular recess leaving the stud 19 unless a
half turn is given to the draw hook 2, when it can immediately be detached but in the 4
working position the two are securely connected.
The grates 10 are in some cases mounted in a slide, and by connecting the said
grates 10 to the T or rocking lever a sliding motion is given thereto and a centre,
and also a "jacquard" shed can be obtained. When the grates 10 are fixed then an
open shed is obtained.
"
5
When the top draw hook or catch 2 is operated by the draw bar 1 and drawn
forward at the time the bottom draw hook is returning then the shedding or jack
lever 9 will remain stationary, when both top and bottom are operated at the same
time the jack or shedding lever will be "rocked or partly turned, opening or closing
the "shed," a direct pull from the draw bars to the shedding levers being obtained by !
the use of the above described appliances, and much of the mechanism heretofore
employed is dispensed with.

page_text: 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. The tumbler levers 13. 14 or the double fingered tumbler lever 14 draw hooks
or catches 2. 3 links or bars 5. 5 chain or cord 6 and pulley 7 carried on the jack or
shedding lever 9 all in combination and as and for the purpose herein described and
substantially as illustrated by the accompanying drawings.
2. The joint, or means of connecting without rivets the draw hooks 2. 3 and
links 5. 5. as herein described and substantially as illustrated by the accompanying
drawings.
"
JOHN
LEEMING.
JOHN ARTHUR LEEMING.
By their Agent, Walter Brierley,
Central Chambers, Halifax.