Improvements in Loom Dobbies.
Year: 1892

page_text: Date of Application, 13th Sept., 1892
Complete Specification Left, 13th June, 1893-Accepted, 5th Aug., 1893
PROVISIONAL SPECIFICATION.
Improvements in Loom Dobbies.
We, BENJAMIN LUPTON and ROBERT HENRY PLACE, of Sandy Gate, Burnley,
in the County of Lancaster, Loom Dobby Makers, do hereby declare the nature of
this invention to be as follows:-
-.
Our invention has reference to prior Letters Patent granted to the said
Robert Henry Place, bearing date the 25th day of July A.D. 1888 No. 10,739.
According to our present invention we employ the hanging levers referred to
in the Specification of said Patent for operating the jack levers to which the
healds are attached. We also employ vertical springs attached to stationary
cross bars, the free end of such springs, together with the lower end of the
hanging lever arms, enter into slots and notches in a horizontal needle or bar.
The hanging lever arms are pushed into position to operate the jack levers by
pegging barrels which peg against the flat spring forcing the horizontal needle
together with the hanging lever arms forward, but when a peg is absent in the
pegging barrel, the flat spring draws the needle and hanging lever backward so
that the said levers are operated in both directions by the flat steel springs.
By operating the hanging levers, through the medium of the springs, the action
in both directions is positive and there is no rebounding of the said hanging
The
levers consequently the dobby can be run at a greatly increased speed.
levelling bar which is employed to level the jack levers can now be placed at
to permit
an angle, whereby we are enabled to give more angle to the "shed
the free passage of the shuttle.
Our invention in dobbies also relates to means to be employed for lagging
back when it is necessary to find a broken pick or for other purposes; to do
this we place on the end of the two pegging barrels a double or two ratchet
wheels having teeth in opposite directions. We also employ four pawls or catches
the arrangement being such that when the loom is weaving, two catches are
operating the pegging barrels in the proper direction, but when we require to
reverse or lag back, the two catches (which are used when weaving) are raised
clear of their ratchet wheels, whilst the other two catches or pawls come into
contact with the other two ratchet wheels, whereby the rotary motion of the
pegging barrels are reversed and this is done without disturbing either the letting
off or taking up mechanism, so that whilst the dobby is being lagged back the
tension of the cloth or warp is not interfered with consequently as soon as the
loom is set on for weaving, the taking up motion does not require to be tightened
as is usual after a loom has been lagged back.
Dated this 12th day of September 1892.
TASKER & CROSSLEI,
Halifax, Agents.
COMPLETE SPECIFICATION.
Improvements in Loom Dobbies.
We, BENJAMIN LUPTON, and ROBERT HENRY PLACE, of Sandy Gate, Burnley,
in the County of Lancaster, Loom Dobby 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 :-
Our invention has reference to prior Letters Patent granted to the said
Robert Henry Place, bearing date the 25th day of July A.D. 1888, No. 10,739.

page_text: In order that our invention may be more fully understood we will make
reference to the accompanying sheet of drawings, wherein
Fig. 1 is a section of our improved dobby,
Fig. 2 an end elevation of same and
Fig. 3 a portion of the front.
A represents the hanging lever arms mounted upon studs or short shafts B
and B', which studs are connected to two levers or beams C fastened by set
screws or other means to a cross shaft D, which shaft is caused to rock or
oscillate through the medium of lever E and connecting rod F operated by crank
from the tappet shaft of the loom in the ordinary manner. The jack levers are
represented at G and they are made to oscillate upon the shaft or stud H.
These jack levers are connected at one end by cord I to healds in the ordinary
manner, whilst the opposite ends of such jack levers are notched as indicated
at a for the purpose of receiving, when required, the lower ends of the hanging
levers A as indicated in dotted lines Fig. 1. The lower ends of the hanging
levers A pass between lugs or notches projecting from needles J shewn more
clearly in enlarged elevation Fig. 4 and plan Fig. 5 and as the lever E
oscillates, the hanging arms A are made to rise and fall between the lugs b of
the needles J. In front of each hanging arm A is a flat steel spring c the
upper end of which is attached to a cross bar but the lower ends of the flat
steel springs lie within the other lugs or notches e in the said needles, and
these springs govern the needles and likewise the hanging arms A in the
following manner :-The pegging barrels K are provided with pegs f, the said
pegs being arranged according to the cloth being woven. When therefore a
peg in the barrels K comes into contact with the steel spring the said
spring is forced forward laterally as indicated in dotted lines Fig. 1, the move-
ment of the said spring carrying with it the needle J and also the lower end
of the lever arm A. This movement of the needle J presents the foot of the
said hanging arm opposite one of the notches a in one of the jack levers G so
that on the next downward movement of the said hanging arm A, a jack lever
is forced downward and the heald is thereby raised, but on the next movement
of the pegging barrel if a peg be absent therefrom the flat steel spring being
released by the absence of a peg, draws the needle together with the hanging
lever arm backwards and away from the notched end of the jack lever, conse-
quently a spiral spring (not shewn) connected underneath the healds, draws the
latter downward, and this goes on according to the arrangement of pegs in the
pegging barrels. There are two pegging barrels K and they are kept in unison
and in proper relation to each other by the gear wheels L which receive their
motion from the compound pawls M, N, centered to a short lever ( secured to
the oscillating shaft D, and by which they are operated. The lower ends of
these compound pawls are in gear with ratchet wheels P secured on the ends of
the shafts of the pegging barrels, and as the shaft D oscillates, these ratchet
wheels are moved forward a tooth, thus imparting intermittent motion to the
pegging barrels in the direction of the arrows Q, therefore when the loom is
weaving, the lighter ends g of each pawl are held in gear with their respective
ratchet wheels by spiral spring R attached by cord h to each lighter end of the
said pawls, but when it is required to lag back to find a broken pick or other
purpose, the handle S shewn in Fig. 2 is operated in the direction of the arrow T
whereby the said spring is released, allowing the two double pawls M and N to
move on their centres and the heavier or hooked ends thereof to fall into engage-
ment (by their own weight) with a second pair of ratchet wheels U, cast or other-
wise connected to the ratchet wheels P, whereby the rotary motion of the pegging
barrels are reversed or rotated in the opposite direction, consequently the action of
the dobby works in exact unison whether the movement be backwards or forwards.
We wish it to be understood that the hanging lever arms A. are operated in both
directions laterally through the medium of the steel springs c which makes the
movement of the hanging levers in both directions positive, and as there is

page_text: no rebounding of the said hanging levers, the dobby can be run at a very high
speed.
For the purpose of obtaining a more level shed to permit the free passage of the
shuttle, we place the cross bar V at an angle as shewn in Fig. 6, so that on the
jack levers G coming against the underside of the oblique cross bar, they occupy
positions where one is slightly above the other, and this causes the warp to
have a more open shed behind, as will be understood by those conversant with
weaving.
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 :—
Firstly. In dobbies having hanging lever arms A the combination therewith of
independent springs c and needles operated in the manner and for the purposes
herein described and illustrated.
Secondly. In dobbies having hanging lever arms A and pegging barrels K the
combination therewith of double ratchet wheels P and U and double acting
pawls M, N, for operating and reversing the pegging barrels in the manner shewn
and described.
Thirdly. In dobbies having hanging lever arms and double acting pawls M, N,
the combination therewith of spiral spring R connecting cord h and handle S
employed for purposes described.
Fourthly. In dobbies having hanging lever arms A the combination therewith of
the oblique cross bar V for causing the jack levers to be placed at an angle for
giving increased angle to the shed all as described.
Dated this 12th day of June 1893.
TASKER & CROSSLEY,
Halifax, Agents.