provements in Let Off Mechanism of Carpet Looms
Year: 1895

page_text: Date of Application, 3rd M y 1895-Accepted, 15th June, 1895
COMPLETE SPECIFICATION
Improvements in Let Off Mechanism of Carpet Looms
We, WILLIAM TALBOT, residing at 116 Sherbourne Street in the City of
Toronto in the County of York and Province of Ontario, Carpet Manufacturer,
and JAMES PETER MURRAY, 1esiding at Cistlefrank Avenue in the said City
of Toronto, President of The Toronto Carpet Manufacturing Company Limited,
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 certain new and useful improvements in carpet looms
and relates more particularly to a means for effecting a positive and uniform tension
on the warp threads without reference to the quantity of thread on the warp beam
so that a carpet of even weight may be produced as a result of this tension, and
the invention consists essentially of igidly mounting a ratchet wheel on the end of
the spindle of the warp beam and pivotally connecting to the frame of the loom a
spring operated dog which is designed to noimally engage with the teeth of the
ratchet wheel and also connecting the dog with the spindle of the whip roll by
means of a chain which is adapted to be partially wound upon the spindle of the
whip roll during the operation of the machine, in order that the teeth of the dog
may be lifted out of engagement with the teeth of the ratchet wheel and the spindle
of the waip beam to let off the warp threads, and also of an arm connected to or
forming part of the spindle of the whip roll and extending outwardly therefrom
and from which is suspended a weight to counteract the tension of the warp
threads during then passage from the warp beam over the whip roll to the
web beam and also in providing the spindle of the wap beam with a fuction
clutch which will arrest the rapid revolution of the warp beam whilst the teeth
of the dog are disengaged from the teeth of the ratchet wheel the whole
device being hereinafter more fully set forth and more particularly pointed out
in the claims
The drawings represent a perspective view of a portion of a carpet loom exhibiting
parts involved in this invention
A represents the reed of the loom supported and carried by the lathe of which
the sword B is pivoted at to the lower portion of the frame C Connected to
each side of the rear of the frame Care brackets C¹, and Journaled in the
brackets C is the spindle D' of the whip roll D Connected to the spindle D' of
the whip toll D are two lugs d in which is mounted the tension rod E rigidly
connected to the spindle D', and located one at either end of the whip roll Dare
two outwardly extending arms D11 A weight D³ is suspended fiom each of the
arms D by means of a rod D* A dog F provided with two teeth f is pivoted
at 1 to the bracl et " which is rigidly connected to the frame C Connected to
the frame below the dog F is one end of a spiral spring J whilst the opposite end
of the spiral spring J is connected to an adjustable hook extending through the
outer end of the dog F The normal tendency of the spiral spring J is to draw
downward the said outer end of the said dog to bring the teeth of the dog F into
engagement with the teeth of the ratchet wheel G The ratchet wheel G is rigidly
mounted on the end of the spindle H of the warp beam I Connected to the dog H
at or about the middle thereof is one end of a chain K, whilst the other end
of the said chain extends partially around spindle D' of the whip roll and is
securely fastened thereto During the operation of the machine the tension of the
J

page_text: warp threads draws the whip roll in the direction indicated by arrow, and causes a
partial revolution of the spindle D' of the whip roll D The partial revolution
of the spindle D' causes the chain K to be partially wound on the said spindle so
that the dog F will be lifted to disengage the teeth f from the teeth of the ratchet
wheel G and allow of the unwinding revolution of the ratchet wheel G and
spindle H Rigidly mounted on the spindle H is a friction collar L made of wood
iron, or other material (but made preferably of wood) Surrounding the collar L
is a divided strap M, the sections of which are connected together by means of
bolts and nuts m― -m¹ respectively, the lower section of the divided strap M being
secured to the frame of the loom By means of the bolts and nuts m-m' the
diameter of the strap can be intensed or diminished to respectively diminish or
increase the friction on the collar L Rigidly mounted on the spindle D' of the
whip roll D is a sector N and pivoted to the frame C is one end o of a brake
shoe O The biake shoe O extends around the sec toi N and the opposite end of
the brake shoe O is connected to the lathe sword B by a pitman P The brake
shoe O holds the sector N during one portion of the movement of the lathe sword B
Wound on the waip beam I ne the warp threads a which pass from the warp beam I
under the tension rod E over the whip roll D and through the reed, A to the cloth
beam Q Having now described the principal parts involved in this invention we
shall now proceed to describe the operation and the advantages arising from the use
of the improvements
The ratchet wheel G it will be remembered is rigidly mounted on the spindle H
of the warp beam I and that the unwinding revolution of the warp beam I and
spindle His prevented until the teeth of the dog are disengaged from the teeth
of the ratchet whel G When the whip roll D has been moved in the direction
indicated by the arrow the spindle D' of the whip roll D is partially turned to
partially wind the chain K on the said spindle D¹ and lift the dog F sufficiently
to disengage its teeth f from the teeth of the ratchet wheel G When the teeth f
of the dog have been disengaged from the teeth of the ratchet wheel G, then the
The tension
ratchet wheel G, the spindle H, and the warp beam I are free to turn
of the warp threads a as the carpet is wound on a forwardly cloth beam Q is
sufficient to move the whip roll D into the inclined position This position of the
whip roll D may if deed be reached every third stroke of the lithe, and it is
when the whip roll D is in its forwardly inclined position that the dog F is lifted
to disengage the teeth f from the teeth of the ratchet wheel G The whip roll D
during its return from its forwardly inclined position to its upright position draw
on the warp threads a and causes the unwinding revolution of the warp beam I, the
spindle H, and the ratchet wheel G When the whip toll D has returned to the
upright position the dog is drawn back into its normal position and its teeth
engage with the teeth of the ratchet wheel G The normal tendency of the spring J
is to draw downwards the outer end of the dog F, so that a quick return of the
teeth into engagement with the teeth of the ratchet wheel may be effected
regulate the tension of the spring J on the dog I the adjustable hook is connecte
to the dog F, and by lengthening or shortening the hook the tension of the spring J
can be respectively dimini hed or increased as required It is by means of the
weight D that the quick return of the whip roll D from its forwardly inclined
position to the upright position is effected, and the weight D³ counteracts to a large
extent the tension of the warp threads a on the whip roll D and also holds the whip
roll D at all times firmly against the warp threads so that the sud warp thread
10
will be kept perfectly taut from the top of the whip roll D to the reeds A
prevent the possibility of more than the required quantity of warp thread unwinding
from the warp beam I during the disengagement of the teeth on the dog F from
the teeth of the ratchet wheel G, we provide a friction collar L and friction
strap M
The friction collar L and friction strap M prevent the free revolution of
the spindle H, and yet allow the spindle H to be turned to unwind sufficient warp
threads to allow the whip roll D to return to its normal position In order to
further facilitate the making of a carpet of uniform weight throughout we provide
To

page_text: as herein before described the sector N and brake shoe which are operated
immediately upon the forward movement of the lathe sword and reed so that the
whip roll is held stationary during the period that the weft threads are being forced
home into the main body of the web
Having now particularly described and ascertained the nature of our said inven-
tion we hereby declare that what we claim is
1 The improvement in carpet looms herein before described and illustrated in the
accompanying drawings
2 In a loom, means for effecting a tension on the warp threads consisting of the
warp beam, a whip roll, a ratchet wheel mounted on the spindle of the warp beam,
a dog pivotally connected to the fiame of the loom normally engaging with the ratchet
wheel, and the chain connecting the dog with the spindle of the whip roll for lifting
the dog from engagement with the ratchet wheel during the partial revolution of the
said spindle, substantially as specified
2 In loom, a means for effecting a tension on the warp threads, consisting of
the combination of the warp beam a intchet wheel mounted on the spindle of the
warp beim, a spring operated dog pivotally connected to the frame of the loom and
normally engaging with the teeth of the ratchet wheel, the whip roll, a chain between
the spindle of the whip roll and the dog to intermittently lift the dog out of
engagement with the ratchet wheel, substantially as specified
3 In a loom, a means for effecting a tension on the warp thread, consisting of
the combination of the warp beam journaled to the loom frame, a ratchet wheel
mounted on the spindle of the warp beam, a dog pivotally mounted to normally
engage with the ratchet wheel, a spring to hold the dog in engagement therewith,
the whip roll, a chain having one end connected to the spindle of the whip roll, and
the other to the spring actuated dog to intermittently lift the dog from engagement
with the ratchet wheel, a sector on the spindle of the whip roll, a brake of the sector,
the lathe word and a pitman, connection between the bike and the lathe sword,
substantially as specified
4 In a loom, means for effecting a tension in the warp threads, consisting of
the combination of the warp beam, the spindle of the waip beam, a sping operated
dog pivotally connected to the frame of the loom normally engaging with the teeth
of the ratchet wheel, the whip roll, a connection between the whip roll and spring
operated dog to intermittently lift the dog out of engagement with the ratchet
wheel during the operation of the loom, a tension rod connected to the whip roll,
and means for automatically returning the whip oll to its normal position during
the disengagement of the dog from the ratchet wheel, a brake for the spindle of the
warp beam to prevent its rapid revolution during the disengagement of the said dog
from the said ratchet wheel, substantially as specified
5 In a loom, the combination with the whip roll and warp beam of a ratchet
wheel secured on the end of the spindle of the warp beam, a pivoted spring operated
dog engaging the ratchet wheel, a chain to connect the dog to the spindle of the
wbip roll, and a friction brake acting on the warp beam spindle, substantially as
specified
6 In a loom, the combination with the whip roll having an arm, and the warp
beam, a spring operated dog, a chain connection between the dog and the spindle of
the whip ioll, a friction biake acting on the warp beam spindle, and a weight attached
to the aim of the whip roll, substantially as specified
7 In a loom, the combination with the whip roll, the tension od E rigidly
connected to the spindle of the whip roll, and the warp beam I, of the ratchet
wheel G, mounted on the spindle of the warp beam, a spring operated dog F,
provided with teeth to engage the ratchet wheel, and pivotally mounted on its
support, chain K connected to the dog and passing partially around the spindle
of the whip roll, the friction collar L hxed on the spindle of the warp beam,
the divided friction strap M on the friction collar, clamping means to adjustably
hold the friction strap on the collar, arm D connected to the spindle of

page_text: the whip roll, and a weight D³ suspended from the arm D", substantially as
specified
8 In a loom, the combination with the whip roll and warp beam of the ratchet
wheel G mounted on the spindle of the waip beam, the dog F hinged to the frame
of the machine and provided with teeth to engage the teeth of the ratchet wheel,
a chain K connecting the spindle of the whip roll and the dog F, an arm D" on
the whip roll and having a weight D1" connected therewith, the adjusting hook ง
in the free end of the dog, the spring I connected at its upper end to the hook and
at its lower end to the fiame of the loom, the sector N secured on the end of the
whip roll, a brake shoe bearing on the sector, the lathe sword B, and the pitman P
between the lathe sword and the brake shoe, whereby the brake is drawn into
engagement with the periphery of the sector in the forward movement of the lath
sword, substantially as specified
Dated thu 2nd day of May AD 1895