IMPROVEMENTS IN DOBBIES USED IN LOOMS FOR WEAVING, APPLICABLE WHOLLY OR IN PART TO SHUTTLE CHANGING MOTIONS."
Year: 1881

page_text: PROVISIONAL SPECIFICATION left by William Arthur Carr at the Office of
the Commissioners of Patents on the 23rd February 1881.
"
WILLIAM ARTHUR CARR, of Manchester, in the County of Lancaster, Manu-
facturer. IMPROVEMENTS IN DOBBIES USED IN LOOMS FOR WEAVING,
APPLICABLE WHOLLY OR IN PART TO SHUTTLE CHANGING MOTIONS."
My Invention relates to improvements in the "dobbie" machines employed in
connection with looms, and consists in novel arrangements whereby the "dobbie"
can be caused to produce varied effects with a less number of lags or cards than
heretofore required, and in some cases to produce variations which have only been
hitherto obtainable by the employment of a jacquard apparatus. In carrying my
Invention into effect I arrange upon the card barrel two or more sets of pegs, or I
combine together in one chain two or more sets of pegs, or perforated lags, or cards
so arranged as to produce the desired variations in the fabric to be woven, the
different sets of pegs, lags, or cards being arranged in alternation, as, for example,
if it is desired to weave a web having alternately plain and figured portions in its
length with a pattern chain, each alternate lag is made suitable for the weaving of
plain cloth, the intermediate lags being suitable for the weaving of a pattern.
Upon the axle of the pattern chain or barrel I fix two ratchet wheels, a pawl being
arranged to engage with each wheel. The said pawls are or may be carried by a
rocking lever which receives motion in any suitable manner. When a change is
to be effected one of the said pawls is moved out of gear and the other pawl is
moved into gear. In one arrangement lifting fingers are arranged to act upon the
said pawls, and are controlled in their movements by means of a chain or barrel.
The said chain or barrel is moved once or more in each revolution of a wheel,
which rotates to a certain extent for each double pick of the loom. The teeth of
the ratchet wheel are not arranged opposite one another, but the teeth on one wheel
are intermediate with respect to the other wheel. At the proper times for effecting
the variations in the fabric the aforesaid chain or barrel acts upon one of the lifting
fingers which then lifts the then acting pawl out of gear, the other finger at the
same time allowing the pawl, which will produce the desired change, to come into
operation, the previously working pawl remaining idle until its turn to act again
arrives. When in operation each movement of the actuating pawl presents in

page_text: succession each alternate lag to the needles, thus weaving, say, for example, the
plain portion of the fabric. At the proper time for commencing the figured
portion the said pawl will be lifted out of gear and the other pawl will be lowered
into gear, and the lags intermediate with those last acting will be brought into use.
When required more than two sets of lags may be united in one chain, a corre-
sponding number of ratchet wheels and pawls with their teeth suitably arranged
being used. My Invention is applicable wholly or in part for use as a drop-box or
revolving shuttle box motion.