Year: 1888

page_text: Date of Application, 7th June, 1888
Complete Specification Left, 7th Mar., 1889
Complete Specification Accepted, 13th Apr., 1889
IN
I WILLIAM WARRINGTON of Fairfield Mills Droylsden in the County of Lancaster
Manager do hereby declare the nature of this invention to be as follows.-
The object of this invention is to increase the efficiency of the ordinary dobby used
in conjunction with the loom in producing patterns by weaving by enabling the
in the pattern
necessary changes in the pattern to be made with very few "cards
chain, and my improvement is effected as follows
-
I employ an ordinary dobby with the usual set of knives and needles and I provide
each end of these needles with fittings to work in conjunction with a pair of pattern
chains and barrels.
These needles at one end work against a pattern chain in the usual manner, and at
the other end are provided with fixed arms projecting downwards in such a position as
to be pulled outwards when required by projections or bowls on a second pattern
chain.
The shafts of the two pattern barrels are both mounted in bearings carried upon
the same levers and at either end thereof, the centres of the said levers being in
such a position that the act of moving the first named pattern chain horizontally
into action will lower the second named chain until the projections or bowls thereon
miss the fixed arm on the needles.
I connect one of these levers by a link to a second lever which is actuated
either directly or indirectly by a suitable pattern barrel and chain in a convenient
position at one side of the loom.
The two barrels are preferably caused to revolve by a single chain passing round
a chain pulley on each barrel shaft and a small chain wheel actuated by a driving
shaft.
I also form each pattern chain with two sets of projections, producing two
patterns and I provide the pattern barrels with means for sliding in its lever bearings
so as to bring either pattern into action as may be required.

page_text: I thus have four changes of pattern acting in conjunction with a single set of
needles, and it will be evident that the length of chain required for any given
pattern will be greatly reduced by the use of this improved dobby.
Dated this 6th day of June 1888.
Improvements in the Construction of Dobbies.
I WILLIAM WARRINGTON of Fairfield Mills Droylsden in the County of Lancaster
Manager 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 :-
وو
The object of this invention is to increase the efficiency of the ordinary "dobby
used in conjunction with the loom for producing patterns by weaving, by enabling
the necessary changes in the pattern to be made with very few "cards" in the
pattern chain.
The nature of my said invention and the manner in which the same is to be
performed or carried into practical effect will be readily understood, on reference
to the two sheets of drawings hereunto annexed and the following explanation
thereof.
Fig. 1. on Sheet 1 of the drawings is an elevation of a dobby fitted with my
improved apparatus and Fig. 2 is a sectional view of a portion of the same detached.
Fig. 3 on Sheet 2 of the drawings is an end view of the framing of a loom and
dobby with my improved apparatus shown as applied thereto.
a is part of the side framing of the loom b, is the crank shaft, and c the tappet
shaft.
I employ an ordinary dobby fitted with the usual set of knives d and needles e
and I provide each end of these needles with fittings to work in conjunction with
the pattern chain fand f¹ on the two barrels g and h
The needles e at one end work against the pattern chain fin the usual manner, and
the other end are provided with fixed arms projecting downwards in such a position
as to be pulled outwards when required by the projections k (or bowls) on a second
pattern chain f¹ passing over the barrel h.
The shafts of the two pattern barrels g and are both mounted in bearings
carried upon the same curved levers m one at each end thereof, the centres or fulcra n

page_text: of such levers being in such a position that the act of moving the pattern chain f
horizontally into action will lower the pattern barrel h until the projections k (or
bowls) miss the fixed arms on the needles as shown at Fig. 2.
The reverse position is shown by the dotted lines. I connect the arm m¹ of one of
the levers m by a link o to a second lever p which is actuated either directly or
indirectly by a suitable pattern barrel and chain q (see Fig. 3) placed in a convenient
position at one side of the loom.
The two barrels g and h are preferably caused to revolve by a single chain † (see
Fig. 1. passing round a chain pulley on each barrel and round a small chain wheel s
actuated by spur gearing from a driving shaft t.
I also form each pattern chain with two sets of projections and I provide the
pattern barrels g and h with levers u or other means for sliding them in their lever
bearings so as to bring either pattern into action as may be required.
Thus I have four changes of pattern acting in conjunction with a single set of
needles, and it will be evident that the length of chain required for any given pattern
will be greatly reduced by the use of my improved apparatus.
The pattern chain g which acts on the lever p (see Fig. 3) is driven preferably by
means of a star wheel motion v actuated by spur gearing w from the crank shaft,
being provided with a hand lever for throwing it into and out of gear as required.
Or the lever p may be acted on directly by means of a hand lever y (as shown at
Fig. 1).
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
The combination in "dobbies" of two pattern chains or barrels mounted on the
same rocking levers, with needles having fittings at each end to work in connection
therewith, such pattern chains or barrels having also an end wise motion so that four
changes of pattern may thus be obtained substantially as hereinbefore described and
illustrated by the drawings annexed.
Dated this 6th day of March 1889.
GEORGE DAVIES,
4, St Ann's Square, Manchester,
Agent for the Applicant.