An Improved Picking Motion for Looms.
Year: 1889

page_text: Date of Application, 2nd May, 1889
Complete Specification Left, 18th Sept., 1889-Accepted, 19th Oct., 1889
PROVISIONAL SPECIFICATION.
An Improved Picking Motion for Looms.
A communication from abroad by ALEXANDRE JOSEPH LAVAL-CHARLET, of
Armentières, France, Machine Maker.
I, JOHN CLAYTON MEWBURN of 55 and 56 Chancery Lane in the County of
Middlesex, Fellow of the Institute of Patent Agents, do hereby declare the nature of
this invention to be as follows:-
This invention has reference to looms for weaving, and it consists of an improved
picking motion.
At a short distance from the central bar of the loom frame 1 mount a horizontal
rocking shaft in suitable bearings. To this shaft is fixed a bar carrying at its upper
end a projection of a suitable hard material. On the crank shaft or can shaft is fixed
a snail cam which is formed so as to cause the projection before named to move a
certain distance by making the rocking shaft turn on its axis. This shaft also carries
a heavy beam formed at its end with a pin or gudgeon over which is passed a strap
that is bolted to a sector fixed to the heel or lower end of the picking stick. At each
turn of the snail cam the projection falls from the inclined plane of the cam, and as
the rocking shaft therefore rocks back the heavy beam simultaneously falls of its own
weight and though the strap gives the necessary movement to the picking stick. A
spring returns the picking stick in the ordinary manner. Instead of the strap before
described a tappet or lug jointed to the heel of the picking stick may receive the blow
or impulse given by the heavy beam, the end of which is formed to act thereon.
Dated this 2nd day of May 1880
J. C. MEWBURN.
COMPLETE SPECIFICATION.
An Improved Picking Motion for Looms.
I, JOHN CLAYTON MEWBURN, of 55 and 56, Chancery Lane, London, in the County
of Middlesex, Fellow of the Institute of Patent Agents, do hereby declare the nature
of this invention (which has been communicated to me from abroad by Alexandre
Joseph Laval-Charlet, of Armentières, France, Machine maker) and in what manner
the same is to be performed to be particularly described and ascertained in and by
the following statement :-
This invention has reference to looms for weaving, and it consists of an improved
picking motion.
And in order that my invention may be more fully understood I have caused to be
appended hereunto one sheet of drawings marked with letters of reference indicating
like parts in the various figures, in which Fig. 1 is a front elevation, Fig. 2 a plan
showing the improvements applied to a loom, Figs. 4 & 5 are respectively a plan and
front elevation on an enlarged scale showing part of the improvement detached, and
Fig. 3 a front elevation of a modification thereof..
A is the loom frame, B the slay, the crank or cam shaft, E the central bar
forming a central bearing for the crank or cam shaft C, D the picking stick, U its
fulcrum, H the slay arm, G its pivots.
Referring to Figs. 1, 2, 4 & 5, at a short distance from the central bar E of the
loom frame A I mount a horizontal rocking shaft K in suitable bearrings L, L'.
To this shaft K is fixed a bar N carrying at its upper end a projection n of a
suitable hard material. On the crank shaft or cam shaft C is fixed a snail cam S,
which is formed so as to cause the projection n before named to move
a certain

page_text: distance by making the rocking shaft K turn on its axis. This shaft K also carries
a heavy beam F formed at its end with a pin or gudgeon M, over which is passed a
strap T that is bolted to a sector X fixed to the heel Y or lower end of the picking
stick D. At each turn of the snail cam S the projection n falls from the inclined
plane of the cam S, and as the rocking shaft K therefore rocks back, the heavy beam
simultaneously falls of its own weight and through the strap T gives the necessary
movement to the picking stick D. A spring Qattached to the beam F and to the
heel Y returns the picking stick D in the ordinary manner.
In order to vary
the weight of the beam F, it is furnished with a stud W on which are placed
weights K¹.
Referring to Fig. 3, instead of the strap T before described a tappet or lug Z
jointed to the heel Y of the picking stick D may receive the blow or impluse given
by the heavy beam F, the end of which is formed to act thereon.
Having now particularly described and ascertained the nature of the said inven-
tion as communicated to me and in what manner the same is to be performed, I
declare that what I claim is :-
In picking motions for looms for weaving.
1st. The general arrangement and adaptation of parts constituting the herein-
before described improvement, operated, substantially as and for the purpose
specified.
2nd. The employment of the rocking beam F provided with weights K¹ and
adapted to actuate, by the medium of the strap T, the picking stick D, substantially
as set forth.
Dated this 18th day of September 1889