Improvements in Let-off and Take-up Mechanisms Applicable for Looms for Weaving.
Year: 1888

page_text: Improvements in Let-off and Take-up Mechanisms Applicable for
Looms for Weaving.
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 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 the let-off and take up mechanisms of looms for weaving
and consists of arranging and constructing the parts forming said mechanisms in such
a manner that they are rendered less cumbersome and more efficient in their
operations.
In order that my said invention 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 the back elevation of a suitable portion of a loom, shewing the improved let-off
mechanism applied to two warp beams, one above the other. Fig. 2 is a cross sectional
view of a similar portion of a loom illustrating the improved take up mechanism as
also another view of the mechanisms shewn by fig. 1.
Fig. 3 is a sectional plan of fig. 1. Fig. 4 is a similar view to fig. 1 and illustrates
a modification in the let off mechanism. Fig. 5 is a top view of fig. 4. Fig. 6 is a
front view of a portion of a loom illustrating the application thereto of my improved
take-up mechanism.
Similar letters and figures of reference indicate similar parts throughout the several
views.
A indicates the end frame of the loom.
Relative to the let-off mechanism the object of this invention is attained by making.
use of the well known frictioning devices, wherein a chain or rope a is wound around
the hoop b mounted upon the outer end of the warp beam c, said rope a being held at
CD

page_text: one end and weighted or otherwise drawn tightly by means of levers and weights or
springs being attached to the other end.
However according to this invention instead of the rope or chain being directly
attached to the weighting lever or to any parts mounted upon same as has heretofore
been the case, it (said rope) is attached to, so that it might be wound around the
drum d. This drum d is mounted to revolve in bearings e fixed to the frame work A¹
of the loom, or those bearings e may be carried by suitable bracket attachments e¹ 50
as to suit the requirements of a supplementary warp beam as shewn at c' as will readily
be understood.
To this drum d is rigidly attached the ratchet wheel and upon the axle shaft of
said drum d and ratchet wheel fis loosely mounted the L lever g carrying the
ratchet in such a manner that said ratchet may operate the wheel f
From this it will be seen that by a weight, such as the weight k, being placed upon
the horizontal arm of the levers g the drum d may be made to rotate upon its axis
and in this manner tend to wind the rope a around its periphery, and that on account
of the purchase of the lever a relative with the drum d, without the weight being
excessively heavy, considerable strain may be put upon the rope a such strain being
readily and easily regulated by altering the position of said weight k upon
lever g.
said
If it is thought desirable that the weight & should be further reduced in order to
still further facilitate its manipulations instead of rigidly attaching the ratchet wheel f
to the drum d an ordinary toothed gearing wheel 7 (see fig. 4) may be attached thereto,
and made to gear with the wheel m which is rigidly mounted upon the axle shaft of
the ratchet wheel the same being operated by the ratchet hand lever g as above
described or again this toothed gearing may be multiplied to still further increase
the purchase as will be readily understood.
By forming the outer end d¹ of the axle shaft of the drum d or the end 2 of the
shaft upon which the wheels f¹ and m are mounted, square or other suitable shape in
cross section to allow the operative to apply his key for the purpose of manually
causing same to rotate, the lever g may be regulated to operate at any distance from
the floor.
Respecting the improvement in connection with the take-up mechanism, my invention
relates to the common and well known class wherein two beams are employed for
this purpose, one of said beams receiving its rotary motion by being kept in constant
contact with the other that has rotary motion imparted to it in any one of the well
known ways.
As is well known a great many methods have been devised and usod for the
purpose of keeping or lifting one of said beams into contact with the other, among
which counterbalancing weights operating chains that pass over grooved pulleys
mounted in suitable bearings have been used, however these counterbalancing arrange-
ments have each and all required considerably heavy weights in order to attain the
object desired, but the arrangement employed according to my invention obviates this
necessity and this arrangement consists of mounting loosely a double grooved bowl p
upon the axle or shaft of the beams, one part p' of said bowl p being considerably
less in diameter than the other part.
To said part p¹ I attach one end of the chain t in such a manner that it may be
wound around said part p¹ and the other end of said chain t I attach to the eared-
hoop which lays hold loosely of the shaft of the beam w. To the part of bowl
which is of increased diameter I attach one end of the chain a to the other end of
which is attached the weight y.
By this arrangement the weight y always tends to rotate the double bowl p p¹ in
such a manner that by the winding of the chain t upon the part pl the beam w is raised
to press against the beam s, and since the part of the bowl p p to which the weight y
is attached is considerably larger in diameter than the part pl said weight y is not
required to be very heavy but of course this is determined by the ratio of the diameters
of the two parts of the double bowl p p and the weight of the bean was will be well
understood.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be perforined, I declare that what I
claim is :-
1. The drum d having the outer end of its axle shaft of the form described, the
ratchet wheel, the ratchet , the lever g, the weight k, the rope (or chain) a, and the
beam c or c¹ in combination the same being arranged to operate substantially as
specified.
2. The drum d, the wheels and m, the ratchet wheel attached to said wheel m
and having the outer end of its axle shaft formed as described, the ratchet h, the
lever g, the weight k, rope (or chain) a and beam c or c¹ in combination the same
being arranged to operate substantially as specified.
3. The double bowl p p mounted upon the shaft of the bean s, the chains and x,
the carred-hoop v, the weight y and the beam w, in combination the same being
arranged to operate in the manner and for the purpose substantially as specified.
Dated this 23rd day of August 1888.