Year: 1888

page_text: Date of Application, 20th Apr., 1888
Complete Specification Left, 19th Jan., 1889
Complete Specification Accepted, 23rd Feb., 1889
I, EDWIN ROBINSON MERRALL, of the firm of Merrall and Son, of Haworth near
Keighley in the County of York, Manufacturer, do hereby declare the nature of this
invention to be as follows, that is to say :-
It relates to improvements in certain parts of the machines used for twisting or
doubling two or more threads together, whereby said parts are rendered more efficient
and durable than heretofore.
As is well known, in connection with these machines, a drum is placed vertically
therein for the purpose of drawing or winding the several threads from their bobbins,
this drum being styled the "draw" or "trap" drum.
Now the object of this invention is to arrest the motion of this trap-drum, when
one or more of these threads is or are broken, by throwing or lifting same clean out
of gear with its motor by which means same is enabled to be driven "positively
and not by friction as is usual.
"
Again by the employment of this arrangement no extra labour is placed upon the
operative by the parts added requiring extra adjustment after each stoppage.
This is attained by forming a loose coupling between the trap-drum and its motor,
such as by making vertical openings in one part and placing pins on the other part of
the boss intervening said trap-drum and its said motor or by forming a suitable toothed
coupling in or about this part, and to the upper part of this boss or to the lower part
of said trap-drum attaching one or more projections or projecting pins.
Mounted in a suitable position relativo with said trap-drum is a bell-cranked
lever one arm of which extends upwards and bas formed on its outer end a suitably
shaped incline and stop-piece, the other arm of said lever extending horizontally and
having a suitable slot or opening formed in it, into which opening the weighted end of
the common and well known trap-lever is made to enter said trap-lever having its
outer end properly formed for this purpose, by which means when said trap lever is
allowed to operate freely the upright arm of the above named bell-cranked-lever is

page_text: moved and retained in a suitable perpendicular position so that one or another of the
projections formed on the boss or trap-drum above described, will, as said drum
revolves, come in contact with the incline formed on the outer end thereof by mounting
which, until arrested by the stop piece, said trap drum is raised out of gear with its
motor.
However when the above described trap-lever is held from moving or operating
freely as is the case when the threads are passing in a proper manner through the
loop or opening in its outer end as is well understood, the inclined end of the
bell-cranked-lever above described is held so that the projections on the trap drum may
move clear of it and so the drum is allowed to continue its motion.
When the above described trap-lever is liberated through any breakages of the
threads, and having moved to accomplish the arrest of motion of the trap-drum as
above described, it is only necessary for the operative to press the outer end as in the
usual way when repairing said broken threads in order to replace same as well as to
replace the trap-drum and rearrange the bell-cranked lever.

page_text: COMPLETE SPECIFICATION.
Improvements in Machinery for Twisting or Doubling Yarns
or Threads.
I, EDWIN ROBINSON MERRALL of the Firm of Merrall and Son of Haworth near
Keighley in the County of York, 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, that is to say :-
It relates to improvements in certain parts of machines used for twisting or doubling
two or more yarns or threads of fibrous substance together, whereby said parts are
rendered more efficient and durable than heretofore.
In connection with these said machines, a drum is placed vertically for the purpose
of drawing or winding the several threads from their bobbins, this drum being styled
the "draw or "trap" drum.
"
Now the object of this my said invention is to arrest the motion of this "trap-drum,"
when one or more of these threads is or are broken, by throwing or lifting same clean out of
gear with its motor, by which means same is enabled to be driven "positively" and not by
friction as is usual. Again, by the employment of this invention no extra labour is
placed upon the operative by the parts added requiring extra adjustment after each
stoppage. Such being the nature and object of my invention in order that same may
be more readily understood I have hereunto appended sheets of drawings illustrative
thereof, to which, by figures and letters, reference is made in the following
description.
Fig. 1 is sectional end view of a portion of a machine shewing the application
thereto of my invention. Fig. 2 is a front view thereof while fig. 3 is top view
of fig. 2.
Fig. 4 is a perspective view shewing the general arrangement of the improved
parts. Figs. 5, 6, 7 and 8 are drawings shewing separate parts hereinafter
referred to.
Figs. 5, 6 and 7 are of enlarged scale.
The object above described is attained by forming a loose coupling between the
trap-drum a and the parts employed for imparting motion to it, such parts being the
spindle or shaft 6 bevil wheels cc' and the shaft d, to which shaft d and parts b, c, c¹,
motion is imparted in the usual well known manner. This loose coupling may be
formed by the part e being fixed to or rigidly mounted upon the spindle 6 and having
prongs or teeth formed thereon as shewn by detail drawing fig. 6, and a similar
part e being attached to or formed on the lower part of the drum a or said coupling
may be formed by a pin being inserted into the part e and openings being made in the
part el to receive same instead of the prongs or teeth being formed thereon as will
be well understood and as shewn by fig. 8.
Mounted upon the bearings is a bell cranked lever g one arm g¹ of which extends
upwards and has formed on its outer end a suitably shaped incline (see fig. 5) and

page_text: stop-piece the other arm g³ of said lever extending somewhat horizontally and
having a suitable slot cr opening gt made therein. Into this opening g' is inserted
the pointed end (which is formed by a pin being driven into an opening made
endwise therein) of the lever h, said lever h being the common and well known trap-
lever or baulk. From it will be seen that when said trap-lever or baulk his allowed
to operate freely upon its fulcrum the lever g will be placed and retained in such a
position that its arin g' will be brought into the position as shewn by fig. 1 and as
shewn at A and B fig. 2, in which position it is in the path of motion of the pin a¹
which is attached to so as to rotate with said drum a, consequently when said pin a¹
comes in contact with the inclined end of the arm g¹ of the lever said arm gl being
rigidly held in that direction, by mounting which, the part e is lifted clear of
the part e and the motion of the drum a thereby arrested. However when the above
described trap-lever h is held from moving or operating freely as is the case when
threads are passing in a proper manner through the loop or opening h³ made in said
lever hand as shewn at c figs. 1 and 2, the inclined end of the lever g is held as
shewn at I fig. 2, so that the pin a' on the drum a may move clear of it, in this
manner allowing the drum a to continue its motion.
The stop-piece g³ formed at the outer end of the lever arm g¹ is to arrest the motion
of the pin a when same has reached the top of the incline. And at this part of the
incline a suitable hollow place or flat part is formed so that the pin may be thereby
prevented from descending by the vibratory motion of the machine as will be well
understood.
When the above described trap lever is liberated through any breakages of the
threads, and having moved to accomplish the arrest of motion of the trap-drum a as
above set forth, it is only necessary for the operative to press the outer end as in the
usual way with those common and already in use when repairing said broken threads
in order to replace same as well as to replace the trap-drum a and arrange the lever g
ready for a repetition of the functions herein before described.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to he performed, I declare that what I
claim is :-
1. The drum a formed with its part e¹ as shewn, the piece e, the lever g having an
arm g (said arm g' having an incline formed thereon as shewn) and an arm g³, the
lever / constructed as set forth, and the necessary bearings in connection with said
drum and levers, in combination the same being formed and arranged to operate
substantially in the manner and for the purpose specified.
2. The general arrangement and combination of parts as herein described and illus-
trated by the accompanying drawings, whereby an efficient stop mechanism for the
trap drum of twisting and doubling machines, is produced for the purpose specified.
Dated this 18th day of January 1889
E. R. MERRALL.
Per Samuel Hey,
Agent.