Year: 1887

page_text: Date of Application, 28th Nov., 1887
Complete Specification Left, 28th Sept., 1888
Complete Specification Accepted, 2nd Nov., 1888
We, CHARLES TIMOTHY BRADBURY, Cotton Manufacturer, and WILLIAM HALLIDAY,
Weaving Manager of Riversvale, Ashton-under-Lyne, in the County of Lancaster,
and HENRY LIVESEY, of Green Bank Iron Works, Blackburn in the County of
Lancaster, Loom Maker, do hereby declare the nature of this invention to be as
follows:-
This invention relates to an improved shedding motion or dobby for actuating the
healds of weaving looms, and its object is to provide a "positive" motion free from
the defects incidental to the employment of the weights and springs commonly used
for depressing or drawing down the healds.
The invention consists in combining a duplicate or second motion with the
mechanism raising the healds arranged in a similar manner to draw down or depress
the healds, thus the liability to catch and the excessive wear and tear occasioned by
the said springs and weights is obviated.
We preferably carry out our invention by employing upper and lower levers
respectively pivoted at or about their centres above and below the healds, and each
shaft is attached to a pair of such levers the outer ends of which are connected
together. Two chain barrels are mounted parallel to and at opposite sides of the
pivot of the upper levers and are connected together by gear wheels driven from the
tappet shaft by bevel gear and a vertical or diagonal shaft. A number of pattern
chains corresponding to the number of shafts of healds to be operated are arranged on
each of the said barrels and pass round supporting rollers above. Projecting links
on the said chains are so formed and arranged that they come in contact with said
upper levers and cause them to oscillate on their pivot as the healds to which they
are connected are required to be raised or lowered, the chains on one barrel through
the medium of the upper levers raising the healds and the chains on the other barrel
drawing down the same through the medium of both the upper and lower levers. As
for example; for each pick the projections on the chains of each barrel are so
relatively arranged that those on one barrel raise the inner ends of a the levers

page_text: connected to the healds which for the purpose of producing the pattern required to
be lifted, whilst all the other healds are drawn down by the projecting links of the
chains of the other barrel depressing the inner ends of the remaining upper levers
thereby raising the outer ends of such levers which are connected to the lower levers
and the inner ends of the latter draw down the healds to which they are attached.
Two or more consecutive links of the said chains may be arranged to project as the
pattern requires.
It is obvious that other forms of shedding mechanism may be employed in duplicate
for similar purposes.
In lieu of the duplicate motion herein mentioned we may employ a weight on the
outer end of the lower levers in which case the upper levers have preferably vertical
projections at their fulcra adapted to be connected to and operated by rods attached
to the vertical pieces of the ordinary dobby by which the jack levers are usually
operated.
D
1
T
DRACUP & NOWELL,
Bradford, Agents.

page_text: Improvements in Dobbies or shedding Motions of Looms.
We, CHARLES TIMOTHY BRADBURY, of Riversdale, Ashton-under-Lyne in the County
of Lancaster, Cotton Manufacturer, WILLIAM HALLIDAY, of Crawford Terrace Ashton-
under-Lyne, aforesaid Weaving Manager, and HENRY LIVESEY, of Greenbank Iron
Works, Blackburn in the said County, Loom 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:-
66
This invention relates to improvements in shedding motions or dobbies for actuating
the healds of weaving looms, and its object is to provide a positive" motion of
simple construction free from the defects incidental to the employment of the weights
and springs commonly used for depressing or drawing down the healds.
The invention consists in combining a duplicate or second motion with the
mechanism raising the healds arranged in a similar manner to draw down or depress
the healds, thus the liability of the healds to catch or remain up and the excessive
wear and tear occasioned by the said springs and weights is obviated.
To carry out our invention we preferably employ upper and lower jack levers
respectively pivoted above and below the healds, and each shaft is attached to a pair
of such levers the outer ends of which are connected together. Two chain barrels
are mounted parallel to and at opposite sides of the pivot of the upper levers and are
connected together by gear wheels and driven from the tappet shaft by bevel gear
and a vertical or inclined shaft. A pattern chain provided with a series of anti-
friction rollers corresponding to the number of shafts of healds to be operated are
arranged on each of the said barrels and pass round supporting barrels above.
Projecting rollers on the said chains are so formed and arranged that they come in
contact with said upper levers and cause them to oscillate on their pivot as the healds
to which they are connected are required to be raised or lowered, the rollers projecting
from the chains on one barrel through the medium of the upper levers raising
the healds, and the chains on the other barrel drawing down the saine through the
medium of both the upper and lower levers. As for example, at each pick the
projecting rollers on the chains of each barrel are so relatively arranged that those on
one barrel raise the inner ends of all the levers connected to the healds which for the
purpose of producing the pattern require to be lifted, whilst all the other healds are
drawn down by the projecting links of the chains of the other barrel depressing the
inner ends of the remaining levers thereby raising the outer ends of such levers which
are connected to the lower levers and the inner ends of the latter draw down the
healds to which they are attached. Two or more consecutive links of the said chains
may be arranged to project as the pattern requires.
In order to fully describe our invention reference is to be had to the accompanying
sheet of drawings in which similar letters of reference indicate corresponding parts in
each of the figures.
Figure 1, is a front view of the framework of a loom with a section of the pattern

page_text: chains and barrels, as well as the bracket in which they are mounted and to prevent
confusion, showing only one heald and the upper and lower jack levers in connection
therewith.
Figure 2, is an end view of the same with the pattern chain rollers omitted excepting
the rollers shown in figure 1, and the rollers carried by one link of the chain.
Figure 3, represents a plan view of the bracket in which the chain barrels are
mounted and the top jack levers, with the later represented by broken lines excepting
the lever shown in figure 1, which is drawn in full. The jack levers in figure 2 are
similarly represented.
Figure 4, represent an end view on a large scale of one of the chain barrels.
Figure 5, is an elevation on the same scale of a portion of the pattern chain without
the pattern rollers. Figure 6, is a side view of the same.
Any convenient method of "tying up "the healds may be employed in which the
outer ends of the top jack levers can be adapted to draw down or depress the healds,
we prefer the following arrangement: The top jack lever A is connected to the top
heald shaft B of the heald B₁ by the double connection C, and the outer end of such
lever is also connected by the "streamer wire" or connection C¹ to the outer end of
the lower jack or T lever D pivoted at E in any convenient manner, and connected
by its inner end to the lower heald shaft F. The arm G of the lever D is connected
by to the L lever H and the other arm of such lever is attached by the
connection C³ to the other end of the heald shaft F.
The jack lever A is pivoted on the pin J secured in the bracket L mounted upon
the top cross rail M of the loom. Chain barrels N and N¹ are mounted by their
arbors K and K in bearings a formed in the bracket L, above the lever A and
equidistant from the pin J. Pattern chains O pass round each of the said barrels and
are supported above by the barrels P revolving loosly upon the studs Q, adjustably
fixed in the slots R formed in the horns or standards S cast with or secured to said
bracket and provided to enable different lengths of chain to be kept comparatively
straight. The chain barrels N and N¹ are geared together by the wheels T mounted
upon the front end of the arbors K and K and the barrel N is driven from the tappet
shaft by the bevel wheel V mounted at the rear end of K engaging the bevel wheel b
fixed at the top of the vertical shaft U. The shaft U is mounted in bearings c, c
and is operated from the tappet shaft by the bevel wheel d, fixed at the bottom,
engaging the bevel wheel e mounted upon the tappet shaft.
The pattern chain is built up or constructed in the ordinary manner of side links i
connected together by the rods m upon which the large antifriction rollers n and
small rollers or washers are mounted. Bosses p project from the said links adapted
to engage the notches t in the barrels and thus actuate the chains as such barrels
revolve.
The number of rollers n and washers r mounted upon each rod m of the chains
corresponds to the number of shafts of healds required to be operated and the said
rollers are so relatively arranged on the said chains and such chains are so operated
during the interval between each pick that the pattern barrels move the chains one
link, and a roller n on one chain or the other is constantly or almost constantly in
contact with each lever A, and as the rollers on one chain move away from said
levers, leaving a space or spaces in said chain containing a washer, or washers the
rollers on the other chain come in contact with said levers thereby oscillating them on
their pivot J and communicating the required up and down motion to the healds.
It is obvious that two or more consecutive rollers may be arranged to project from
the chains or two or more rollers may be placed side by side, or the space between
them may be arranged according to the requirements of the pattern to be produced
and that the length of the chains may be increased or reduced. It is also obvious
that chains with projecting links may be used instead of the said antifriction rollers,
but we find the antifriction rollers preferable.
As a modified arrangement the chain barrels N and N¹ may be mounted beneath
the upper jack levers and the said chains be suspended thereform, or the loose chain
may be suspended in a box beneath to keep it clear from the mechanism below.

page_text: Having now particularly described and ascertained the nature of our said Invention,
and in what manner the same is to be performed, we declare what we claim is :-
:-
1. The combination with the heald raising mechanism of a loom of, a duplicate or
second motion adapted to positively depress said healds, substantially as herein shown
and described and illustrated and for the purpose specified.
2. In a shedding motion, the combination of two pattern chains provided with
suitably arranged projecting anti-friction rollers adapted to operate the jack levers
substantially as herein shown and described and for the purpose specified.
Dated this 27th day of September 1888.
DRACUP & NOWELL,
Bradford, Agents.