AN IMPROVED STOP MOTION FOR SPREADING AND DRAWING FRAMES
Year: 1881

page_text: LETTERS PATENT to Arthur Tredgold Lawson and Somerville Dear, both of
Leeds, in the County of York, Machinists, for an Invention of "AN IMPROVED
STOP MOTION FOR SPREADING AND DRAWING FRAMES."
PROVISIONAL SPECIFICATION left by the said Arthur Tredgold Lawson
and Somerville Dear at the Office of the Commissioners of Patents on the
6th January 1881.
ARTHUR TREDGOLD LAWSON and SOMERVILLE DEAR, both of Leeds, in the
County of York, Machinists. AN IMPROVED STOP MOTION FOR SPREADING AND
DRAWING FRAMES.” ·
"E
In spreading and drawing frames where the sliver is delivered into cans, it is
usual to have some means for indicating when the required length of sliver has
been delivered from the roller, so that all the slivers may be of equal length for the
following frame. A bell or some other indicator connected to the roller by gearing,
and regulated so as to indicate any length of sliver as required, has heretofore been
used, but it has been found that unless the attendant, who has to look after a
number of frames, happens to be at the exact spot as the bell rings, the frame
continues to deliver the sliver until stopped by the attendant, and that therefore
more sliver is delivered than is required.
Now the object of this Invention is to provide an automatic stop motion to
throw the belt off the driving pulley onto the loose pulley when the required length
of sliver has been delivered, thereby stopping the action of the frame at once.
In carrying out this Invention, the slivers pass over delivering bosses as usual,
and motion is communicated to the boss shaft in the ordinary manner.
In gear with this boss shaft, by means of worms and worm wheels, is a large disc
wheel which carries a pin on its face. This pin comes in contact from time to time
with the longer arm of a double lever, the smaller arm of which presses against
and pushes out a spring with a bell attached. This lever is held in position to
catch the pin on the face of the disc wheel by a spiral spring, one end of which is
attached to one arm of a bell crank and the other end to the frame. Both the
double lever and bell crank are mounted on a rock shaft which works in a socket
[Puin 1

page_text: on a bracket attached to the frame. In this bracket is a slide for a weighted slide
bar, which is held up by a spring catch until the latter is displaced by a finger
attached to the spare arm of the bell crank. As the disc wheel rotates, its pin will
come in contact with the long arm of the double lever and will rock the shaft on
which this lever is mounted, and with it the bell crank lever, thus expanding the
spiral spring. When the pin has passed beyond the reach of the lever the spiral
spring will suddenly contract and rock the shaft on which the levers are mounted,
which will have the effect of releasing the pressure on the bell spring and allow it
to regain its normal position (in doing which the bell will be rung), and at the same
time drive forward the finger, which will knock the spring catch from the top of
the bracket on which it rests and allow the weighted slide bar to drop. This slide
bar is formed with a lug or projection thereon, and as the slide bar descends it will
carry down with it, by means of the projection, a setting lever, connecting rod, and
second lever keyed to the end of a second rock shaft. This second shaft also
carries a crank, the pin of which works in a slot in the belt fork of the machine,
and thus by moving the belt fork shifts the belt to the loose pulley. By laterally
moving or springing the setting lever clear of the projection on the slide bar,
the belt fork can be moved independently of the stop motion.
It will be evident that this stop motion may be applied to any apparatus in
which it is desired to measure off a regulated quantity of material, and that any
quantity may be measured off by changing the diameter of the disc wheel, for which
purpose the position of the axle of this wheel is made adjustable.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent
filed by the said Arthur Tredgold Lawson and Somerville Dear in the Great
Seal Patent Office on the 6th July 1881.
ARTHUR TREDGOLD LAWSON and SOMERVILLE DEAR, both of Leeds, in the
County of York, Machinists. "AN IMPROVED STOP MOTION FOR SPREADING AND
DRAWING FRAMES."
In spreading and drawing frames where the sliver is delivered into cans, it is
usual to have some means for indicating when the required length of sliver has
been delivered from the roller, so that all the slivers may be of equal length for the
following frame. A bell or some other indicator connected to the roller by gearing,
and regulated so as to indicate any length of sliver as required, has heretofore been
used, but it has been found that unless the attendant, who has to look after a
number of frames, happens to be at the moment near the frame which gives the
indication, that a proper length of sliver has been delivered, the frame will continue
working, and thus deliver an undue length of sliver before the attendant can arrest
its motion.
Now the object of this Invention is to provide an automatic stop motion to
throw the belt off the driving pulley onto the loose pulley when the required length
of sliver has been delivered.
In the accompanying Drawing Fig. 1 shews in end elevation so much of a
drawing frame with our stop motion applied thereto as will serve to explain the
nature of the Invention, and Fig. 2 is a partial front view of the same. In these
Figures A is the delivery roller and B the lower back roller, over which the sliver
passes on its way to the cans (not shewn in the Drawing); C is the main driving
shaft, and C¹ the fast and loose pulleys thereon. Keyed to the axle of the delivery
roller A is a worm a, which gears into and drives a worm wheel a¹ mounted on a
short shaft a³, which turns in bearings on the side frame. Keyed to this shaft a²
is a worm a³, which gears into and drives a worm wheel a mounted loosely on a
stud axle projecting from the side framing. This worm wheel a' carries a crank
'pin a', which at every rotation of the wheel strikes the long arm of a bell crank
lever d keyed to a short shaft D running parallel with the roller A. To this same
shaft D is also keyed a second crank lever d', to the vertical arm of which is
pivotted a pusher finger d³ for the purpose to be presently explained. The other
arm of this cranked lever d¹ has attached to it a coiled spring d³, which at its other
end is made fast to a fixed point on the framing.
E is a bar with an elastic catch extension e pendent from and capable of sliding
in guides formed in a fixed bracket D¹ bolted to the framing. This bar carries a
plate e, which is notched out horizontally to receive the end of an elastic lever F
pivotted to the side framing. Pendent from this lever is a link f, which connects
with an arm on one end of a short rock shaft G carried in bracket bearings from
the side framing. On the other end of this rock shaft is an arm, which is slotted
to receive a pin c projecting from the stem of the belt fork c', which serves to shift
the belt from the fast to the loose pulley C¹, and vice versa. The gearing a to a*
inclusive is so timed that the crank pin a' shall make one revolution for the
completion of the delivery of a given length of sliver to the cans. By this means
the pin a³ is caused (so soon as the required length of sliver is delivered) to strike
the long arm of the bell crank lever d, and thereby rock the shaft D in its bearings.
The effect of this will be to cause the crank arm d² to thrust forward the pusher
finger d² which rests on the bracket D' and strike the elastic catch of the bar E,
thereby releasing the catch and causing the bar to drop. The effect of this descent
of the bar E will be to depress the lever F, which by its connection with the

page_text: shaft G will rock that shaft, and cause it through the pin c to move the belt fork c¹
and shift the belt from the fast to the loose pulley, thereby arresting the action of
the machine: So soon as the pin a³ has passed the end of the crank lever d, a bell
will be sounded warning the attendant of the stoppage of the machine. This is
effected by mounting a bell on an elastic support, which bears against the shorter
limb of the bell crank lever d. When therefore this elastic support is relieved from
the pressure of the bell crank lever (which it is suddenly) it will vibrate rapidly,
and thereby sound the bell which it carries.
This sudden release is effected by the contraction of the elastic spring d³, which
comes into action immediately the bell crank lever d is released from the pressure
of the pin a³. To enable the drawing frame to proceed with its work, it is only
necessary for the attendant to lift the bar E and replace its elastic catch on the
bracket D². While thus suspending the bar E the lever F will be lifted, and by
lifting the lever the belt fork will be shifted so as to place the belt on the driving
pulley. By springing the lever F out of the notch of the plate e¹ of the bar E,
the belt fork can be moved independently of the stop motion.
·
From the foregoing description it will be evident that our improved stop motion
may be applied to any apparatus in which it is desired to measure off a regulated
quantity of material, and that any desired quantity may be measured off by simply
changing the diameter of the worm wheel a relatively to the worm wheel a¹,
for which purpose the position of the axle of the worm wheel a is made
adjustable.
"Having now set forth the nature of our Invention of "An Improved Stop
Motion for Spreading and Drawing Frames," and explained the manner of carrying
the same into effect, we wish it to be understood that under the above in part
recited Letters Patent we claim,―
The stop motion constructed and operating as described with reference to the
accompanying Drawing.
In witness whereof, we, the said Arthur Tredgold Lawson and Somerville Dear,
have hereunto set our hands and seals, the Fifth day of July, in the year
of our Lord One thousand eight hundred and eighty one.
A. T. LAWSON. (L.S.)
S. DEAR.
(L.S.)