Improvements in Loom Stopping Mechanism.
Year: 1889

page_text: Date of Application, 16th Nov., 1889
Complete Specification Left, 18th Aug., 1890-Accepted, 20th Sept., 1890
PROVISIONAL SPECIFICATION.
Improvements in Loom Stopping Mechanism.
We, FRANK CLAPHAM WHEELWRIGHT of Carr House, Shipley in the County of
York, Spinner and Manufacturer, and THOMAS ROCHESTER WHITEHEAD, of the Firm
of Whitehead & Wheelwright, Fison's Mill, Bradford in the said County, Spinners
and Manufacturers, do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements in looms for weaving, and its object is to
automatically stop the loom each time a specified or particular number of picks have
been woven, for the purpose of changing the bobbin to renew the weft.
The said improvements consist of the arrangement hereinafter described whereby
the driving belt is periodically thrown from the fast to the loose pulley and the loom
stopped.
To carry out our invention we preferably utilise the weft fork mechanism to stop
the loom and operate it as follows: A worm is mounted upon the tappet or other
convenient shaft and engages a worm. wheel on a counter shaft which carries a pinion
in connection with a toothed wheel with or without the medium of intermediate
wheels or change gear. The said toothed wheel engages a rack connected to a lever
above, which lever is provided with an adjustable finger.
The various parts of the above described mechanism are so relatively arranged that,
as the said toothed wheel is rotated the rack is raised or operated longitudinally,
thereby gradually actuating the said lever connected to it until the adjustable finger
on said lever comes in contact with the shank of the weft fork and holds the latter in
such a position that it engages the weft fork mechanism and stops the loom in exactly
the same manner as when the weft breaks. It is obvious that the said lever may be
arranged to engage other parts of the weft fork mechanism instead of the weft fork,
or that it may be constructed to throw the driving belt off the fast pulley through the
medium of independent mechanism.
The said rack is so arranged that it can be readily restored to its original position
without reversing its operating mechanism. At the same time the said adjustable
finger is removed from contact with the weft fork and the various parts brought into
position for the loom to be restarted as soon as the bobbin is changed. Or the
mechanism may be so constructed that the action of restoring the said rack to its
original position restarts the loom.
Instead of said rack we may employ a connecting rod operated by a crank, lever or
equivalent means and provided with a ratchet or other device to allow the rod and
connections to be returned to a certain position when the loom is restarted.
Approximately the same length of yarn or weft is put upon each bobbin and the
above described apparatus is set to stop the loom immediately before the bobbin is
empty, therefore all inconvenience previously occasioned by the loom being continued
in operation after the bobbin is empty is now prevented.
Dated this 14th day of November 1889.
:
DRACUP & NOWELL,
Bradford, Agents.

page_text: Improvements in Loom Stopping Mechanism.
We, FRANK CLAPHAM WHEELWRIGHT, of Carr House, Shipley in the County of
York, Spinner and Manufacturer, and THOMAS ROCHESTER WHITEHEAD, of the Firm
of Whitehead, Wheelwright & Co. Fison's Shed, Bradford in the said County,
Spinners and Manufacturers, 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 improvements in looms for weaving, and its object is to
automatically stop the loom when it is required to change the shuttle and bobbin to
renew the weft.
The said improvements consist in the arrangement hereinafter described which
stops the loom through the medium of the weft fork stop mechanism immediately
before the bobbin is empty and a specific or particular number of picks have been
made.
Reference is to be had to the accompanying sheet of drawings, forming a part of
this Specification, in which similar letters of reference indicate corresponding parts
in each of the figures. The loom frame and certain other parts being represented by
broken lines to more clearly define the new arrangement.
Figure 1, represents the side frame of a loom with our improvements applied
thereto. Figure 2, is a front view of the same. Figure 3, a plan view of the
upper part, and Figure 4, a back view of the lower part of the stop mechanism.
A worm wheel A is provided on the end of the tappet shaft B to engage a worm
wheel on the counter shaft D mounted in the brackets E and E' fixed to the side
frame F of the loom. A spur wheel G on the other end of the shaft D engages an
intermediate wheel H, which drives the change wheel J, and the latter is mounted on
the cam shaft K. The shaft K is mounted in the bracket E and carries an adjustable
cam or tappet L which at each revolution comes in contact with the knife edge a on
the bottom of the vertical rod M and lifts such rod. The rod M is mounted in a
guide N and is hinged at the top to the end of the lever O pivoted preferably on a
projection P of the stud Q employed to carry the "faller" of the weft-fork stop
motion. An adjustable piece O' is connected by a wing bolt c to the inner end of
the lever O and the horizontal arm of said piece carries an adjustable extension 0³
reaching over the shank R of the weft fork S.
The various parts are so relatively arranged that in operation when the cam L has
lifted the rod -M-to its full-extent the lever 0 connected thereto is moved to such a
position that its extension 02 bears upon the shank R of the weft fork and holding-
the latter down causes it to engage the weft hammer which puts the weft stop motion
into action in the ordinary way and stops the loom. There is however sufficient
momentum in the loom after the stop motion has been put into operation to carry the
cam L far enough round to disengage it from the knife edge a of the rod M ; so that
the latter is free to be drawn down, and the parts connected thereto restored to the
position represented in the drawings, by the spiral spring W provided for that
purpose.
Approximately the same length of yarn or weft is put upon each bobbin and the
above described apparatus is set to stop the loom immediately before the bobbin is
empty, therefore all inconvenience previously occasioned by the loom being continued
in operation after the bobbin is empty is now prevented.
Having now particularly described and ascertained the nature of our said invention,
and in what manner the same is to be performed, we would have it understood
that we are aware certain devices in combination with the weft fork mechanism have
previously been employed to periodically stop the loom, as for instance, each time a
given length of fabric had been woven; but we make no claim thereto for such

page_text: devices are not sufficiently accurate or delicate in operation to effect the object of our
invention, and what we claim is :-
In weaving looms the combination with the weft fork stop motion, of mechanism
arranged to stop the loom immediately before the weft on each bobbin is finished,
substantially as herein shown and described, and illustrated in the accompanying
drawings.
Dated thin 15th Ja ր
1000
DRACUP & NOWELL,
Bradford, Agents.