Improvements in Shedding Motions of Looms for Weaving.
Year: 1889

page_text: Date of Application, 29th Dec., 1889
Complete Specification Lelt, 27th May, 1890-Accepted, 28th June, 1890
PROVISIONAL SPECIFICATION.
Improvements in Shedding Motions of Looms for Weaving.
I, ROBERT WILKINSON, of 11 Tudor Street, Manchester Road, Bradford, in the
County of York, Overlooker, do hereby declare the nature of this invention to be as
follows:--
This invention relates to certain improvements in shedding motions of looms for
weaving described in specification No. 935 dated 18th January 1889, and has for its
object, the combination therewith of certain mechanism, so that the apparatus is
simplified in construction and more positive in its action.
I accomplish my object in the following manner-The levers for operating the catch
levers are imounted on a shaft and each arranged with three arms, one being controlled
by the lag, peg or card mechanism, the other arms extending one to the upper and the
other to the lower catch levers.
These catch levers are mounted on a centre in the respective rack bars, and each
lever has an arm projecting from the said centre in such direction, as to be in contact
with a sliding catch placed in a recess or slot formed in rack bar.
Whenever the catch end of any lever is allowed to descend out of gear with the
reciprocating draw knife, the before mentioned arm of the respective lever moves the
sliding catch into such. position that, an indentation or undercut portion of the same
engages with the edge of a fixed plate, by which it is retained until such time as the
pattern mechanism operates the lover for raising the catch lever into gear with the
reciprocating draw knife.
Dated this 18th day of December 1889
JOHN WAUGH,
Agent.
COMPLETE SPECIFICATION.
Improvements in Shedding Motions of Looms for Weaving.
I, ROBERT WILKINSON, of 78 Ryan Street, Bradford, in the County of York,
Overlooker, formerly of 11 Tudor Street, Manchester Road, Bradford, aforesaid, 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 certain improvements in shedding motions of looms for
weaving described in specification No. 935 dated 18th January 1889, and has for its
object, the combination therewith of certain mechanism so that the apparatus is
simplified in construction and more positive in its action.
In order that my invention may be more clearly understood I will describe the same
by aid of the accompanying sheet of drawings, in which Fig. 1. represents a side view
of the interior or working mechanism of a shedding motion having my improvement
added thereto.
Figs. 2 and 3. are details drawn to a larger scale.
The levers for operating the draw catches B. C. are mounted on the shaft D. of the
dobby in the ordinary manner, each lever having three arms E. F. G. the heavier
arm G. of each lever extending over the lag peg or card mechanism by which it is
operated in the usual manner, the top arm E. actuating the upper draw catch B. and
the lower one F. the bottom draw catch C.
A draw catch B. is mounted on the centre J. of each top rack bar K. and a draw
catch C. to each bottom rack bar L. which are operated in the ordinary manner by the
reciprocating sliding draw bars or knives M. and N. Each draw catch B and C. has

page_text: an arm P. projecting on the opposite side of the centre or supporting pin J. and is in
contact with and operates a sliding catch Q. placed in a recess R. formed on each
respective rack bar K and L.
Whenever the catch end of any of the draw catches B or C. is allowed to descend
clear of the draw-bar or knife M or N. as shown by the top draw catch B. the pro-
jecting arm P. of the said draw catch raises the sliding catch Q. in recess R. into such
position that the undercnt or angular faced part at S. engages with the angular edge
of a fixed plate T. and thereby retains the respective rack bar K. in the position until
a change in the pattern surface operates the respective lever and raises the draw
catch B. a sufficient height for the same to engage with the reciprocating draw bar or
knife M. the projecting arm P. at the same time allowing the sliding catch Q. to
descend to the position shown in the bottom rack bar L. and detail Fig. 2. so that on
the retreat of the draw bar or knife M. in the direction of the arrow, the top of the
sliding catch Q. slides under the fixed plate T. thus keeping the draw catch engaged
with the draw bar or knife M. until the return of the same and rack bar K. to their
original position.
The same remarks as to the operation and retaining of the sliding catches Q. in gear
with the top draw bars or knives M. apply to those mounted in the bottom rack bars L.
and in case the bottom arm F. of a lever raises a corresponding draw catch C. so as to
engage with the bottom draw bar or knife N. the sliding catch Q. will keep the draw
catch C. in gear, by the former sliding under the bottom fixed plate T. and by any
pair of the top and bottom draw catches operating one shaft of healds being at the
same time in gear with the top and bottom draw bars or knives M and N. the said
draw catches and rack bars will move in opposite directions, and the wheel W.
mounted on the connecting rod U. will revolve between the rack bars and leave the
connecting rod U. and healds connected therewith unaltered; but when only one draw
catch of any pair is engaged with a draw bar or knife M or N. and the other dis-
engaged as shown by drawing, then one draw catch and rack bar remain stationary,
and the other with the connecting rod U. and healds connected therewith are
operated.
Whenever a draw catch and rack bar are moved by a draw bar or knife M or N.
backwards in the direction of the arrow, the same must return to their original
position before a change in the pattern takes place, and in order that the same may
return with the draw bar or knife, a connecting rod O. is placed on the end of
each draw bar and on a rod Y. extending across the machine and passing
through the slot Z. in the rack bar by which the rack bar is returned to its original
position.
F
By constructing and arranging the draw catches B and C. with a projecting arm P.
ns shown and described, and working in combination with the sliding catches Q. one
three armed lever E. F. G. only is required for each pair of rack bars M and N. and
the stop pieces hitherto required for retaining the draw catches in the position when
disengaged are dispensed with-thereby reducing the number of levers required for
operating the draw catches by one half and giving more room in the apparatus for
examination and adjustment.
Having now particularly described and ascertained the nature of my inven-
tion and in what manner the same may be performed, I declare that what I
claim is :-
The combination with the rack bars K and L. of a shedding motion of draw-
catches B and C. having projecting arms P. for operating sliding catches Q. in a
"Positive" motion for the purpose as herwinbefore describeil and set forth
JOHN WAUGH,
Agent.