Improvements in Weft Stop Motions for Weaving Looms.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Weft Stop Motions for Weaving Looms.
·I, EDMUND SLICER, of 37A, Booth Street, Bradford, in the County of York,
Merchant, do hereby declare the nature of this invention to be as follows:-
My invention relates to weft stop motions of the kind described in the specifica-
tion of former Letters Patent No. 4937 of 1892 wherein two forks are arranged
to operate in conjunction with two distinct threads drawn from a double pick
shuttle in such a manner that the stop motion shall operate upon the breakage
of either of the two threads.
The stop motion described in the said specification, has hitherto been manu-
factured so that the prongs overlapped each other, that is to say, the lower ends
of the prongs of one fork are arranged to project some distance below the axis
of the adjacent fork and the prongs of the said forks are so bent that in their
normal position, the faces of the two forks are in approximately the same plane.
As the result of this arrangement it sometimes happens that one thread will lie
across both forks and on the backward movement of the batten or slay to beat
up the weft oscillate the said forks so as to disengage them both from the ham-
mer notwithstanding that one weft is broken.
The object of this invention is to arrange the forks so that it is impossible for
a single thread to operate them both simultaneously and to this end it consists
in cranking the fork against which the lower thread operates in such a manner
that the plane of the upper portion of the said fork corresponding with the prongs
against which the upper thread operates shall be at some distance behind the
plane of the prongs of the said upper fork, whereby the said fork for the upper
thread can oscillate freely in the desired manner without liability of the thread
upon it transmitting motion to the fork for the lower thread. The lower ends
of the fork for the upper thread are preferably turned backwards to assist in.
balancing the fork and to prevent the lower thread from inadvertently getting be-
hind the said upper thread fork.
Instead of mounting the forks upon separate axles as described in the said
former specification both the forks may be mounted on the same axle.
Dated this 8th day of March 1898
G. F. REDFERN & Co.,
4, South Street, Finsbury, London
Agents for the Applicant.

page_text: the same is to be performed, to be particularly described and ascertained in and
by the following statement;-
My invention relates to weft stop motions of the kind described in the specifica-
tion of former Letters Patent No. 4937 of 1892 wherein two forks are arranged
to operate in conjunction with two distinct threads drawn from a double pick
shuttle in such a manner that the stop motion shall operate upon the breakage
of either of the two threads.
The stop motion described in the said specification, has hitherto been manu-
factured so that the prongs overlap each other, that is to say, the lower ends
of the prongs of one fork are arranged to project some distance below the axis
of the adjacent fork and the prongs of the said forks are so bent that in their
normal position, the faces of the two forks are in approximately the same plane.
As the result of this arrangement it sometimes happens that one thread will lie
across both forks and on the backward movement of the batten or slay to beat
up the weft oscillate the said forks so as to disengage them both from the ham-
mer notwithstanding that one weft is broken.
The object of this invention is to arrange the forks so that it is impossible for
a single thread to operate them both simultaneously and to this end it consists
in cranking the fork against which the lower thread operates in such a manner
that the plane of the upper portion of the said fork corresponding with the prongs
against which the upper thread operates shall be at soine distance behind the
plane of the prongs of the upper thread fork whereby the said fork for the upper
thread can oscillate freely in the desired manner without liability of the thread
upon it transmitting motion to the fork for the lower thread.
To enable my invention to be fully understood I will describe the same by
reference to the accompanying drawing, in which: —
Figure 1 is a plan view shewing my improvements:
Figure 2 is a longitudinal section; and,
Figure 3 is a section on the line 33 Figure 2:
Figures 4 and 5 are respectively a side view and a front view of a pair of forks
mounted upon different axes.
a is the oscillating slay or batten of a loom and b is the shuttle which is caused
to traverse from side to side of the same through the shed in a well known
manner, e indicating one of the shuttle boxes upon the slay.
d, d' are the two weft forks and e, e are the bars of the grid which are arranged
so that they can pass beween the prongs of the fork, the said bars, if the shuttle
threads f, fare intact, pressing the said threads against the forks so that the
latter are rocked to lift their hooked ends g, g out of engagement with the moving
hammer whilst if either of such threads be broken, the bars e, e pass between
the prongs of the fork which operates in conjunction with such broken thread
whereby such fork is not oscillated to lift it out of engagement with the hammer h
so that the said hammer on its backward movement pulls back the rod i which
carries the forks and so imparts movement to the striking gear or stopping
mechanism.
j, Figure 3, indicates the portions of the prongs of the lower thread fork d¹
which lie beside the prongs of the upper thread fork d, the said portions being
cranked or bent to lie behind the plane of the fork d so that the thread f which
is pressed against the fork d by the bars e, e and causes the oscillation of the said
fork d shall not come into contact with the portion j of the fork and so in-
advertently cause the oscillation of the said fork to disengage it from the hammer
in case the thread f¹ is broken.
The lower ends k of the upper thread fork d are preferably turned backwards
as indicated at k, Figure 3, to assist in balancing the said fork and at the same
time prevent the lower thread f¹ from inadvertently getting behind the prongs of
the said upper fork d.
As shewn in Figures 1 to 3 the forks are both mounted to oscillate upon the
same axle or pin l but if desired the forks may be mounted upon different pins l,

page_text: as shewn in Figures 4 and 5, that is to say, in the manner described in the specifi-
cation before referred to. In either case, however, it will be understood that the
upper ends of the lower thread fork are cranked at j for the purpose herein-
before described and as clearly shewn in Figure 4.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is;-
1. In a weft step motion designed to operate upon the breakage of either thread
of a double pick shuttle, and wherein two weft forks are designed to co-operate
with the two shuttle threads, cranking the prongs of the fork with which the
lower weft thread co-operates so that its upper part lies behind the face of the
fork with which the upper thread co-operates, substantially as, and for the pur-
pose, described.
2. The combination of parts hereinbefore described and illustrated in the accom-
panying drawing for the purpose specified.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London.
Agents for the Applicant.