Improved Means for Letting Back the Warp in Looms, and for Making Transverse Ridges or Tucks in the Fabrics Woven thereon.
Year: 1896

page_text: Date of Application, 7th Aug., 1896
Complete Specification Left, 12th Dec., 1896-Accepted, 17th July, 1897
PROVISIONAL SPECIFICATION.
Improved Means for Letting Back the Warp in Looms, and for Making
Transverse Ridges or Tucks in the Fabrics Woven thereon.
I WILLIAM BALDWIN of Tardeo, Bombay, India, Weaving Master, do hereby
declare the nature of this invention to be as follows:-
My said invention has for its object a device which when actuated by the weft fork
lever of a weaving loom lets back the warp to such a predetermined extent that the
weaving may be resumed without the formation of a ridge or thin place in the
cloth as is apt to occur when the warp is let back to an irregular or improper ex-
tent. When the said device is used in combination with a dobby shaft machine
Jacquard machine or the like appliance it may be used to produce transverse
ridges or tucks in the cloth at any desired distance apart.
In the said device I use a ratchet or toothed wheel mounted on a shaft driven by
a pinion in gear with the taking up mechanism of a loom and hereinafter termed
the driving shaft.
The rotation of the said ratchet wheel is controlled by three pawls one of which
hereinafter referred to as the driving pawl engages oppositely to the two others
which are hereinafter referred to as the fixed and the swinging control pawls.
The driving pawl falls into gear by gravity aided in some cases by a spring or
balance weight. The control pawls are kept up to their work by balance weights
or springs.
The driving pawl is mounted on a rocking lever and drives the ratchet wheel
forwards as the weaving proceeds. The control pawls rising over the teeth of the
ratchet wheel in its forward course offer no obstacle to the rotation thereof.
The bearing which carries the driving shaft is attached to a bracket secured ta
the frame of the loom. An arm or extension from the said bearing carries the
fixed control pawl and is also provided with a sector slot for limiting the action of
the other or swinging control pawl. The latter is mounted in a loose arm which
is free to rotate about the driving shaft or its bearing carries a stud or pin taking
into the said sector slot the length of which determines the travel of the loom arm
and consequently of the swinging control pawl carried thereby. The travel may be
varied by liners or stops in the sector slot and thus the backward rotation of the
ratchet wheel may be controlled. A lever operated by the dobby or corresponding
device has a pin which takes under the driving pawl and is further connected by
a wire cr chain to the fixed control pawl. On the latter lever rising the driving
and the fixed control pawls are withdrawn from gear and the ratchet wheel is then
free te turn backwards under the tension of the warp. Such backward rotation
is however arrested by the swinging control pawl on the stud which governs it
reaching the end of the sector slot. On the breaking of the weft or when changing
the shuttle the release of the ratchet wheel is effected by means of the weft fork
lever.
When used in combination with a dobby or the like device the ratchet wheel
may be released at intervals by means of a suitable card or the like automatic
device and thus a ridge or tuck may be produced on say one side of the cloth. In

page_text: this mode of using my said invention two warps on separate beams are employed.
These warps are equally combined in the plain part of the cloth and are propor-
tioned as follows to form the tuck or ridge.
When the ridge has to be formed one half of the warp is lifted clear of the
shuttle and remains stationary while a sufficient amount of plain weaving for
example six picks are put in the other half to form the ridge.
The dobby (or equivalent apparatus) then releases the driving and the fixed
control pawls when the ratchet wheel is pulled round a distance corresponding to
six picks as determined by the pin and sector slot.
The idle warp is now brought into action and is joined into the cloth and the
reeds drawing the woven part along the warps just taken in produce a ridge or
tuck which may be repeated where desired.
Dated this 5th day of August 1896.
E. T. WHITELOW, A.M. Inst. C.E.,
70 Deansgate, Manchester, Agent for the Applicant.
Improved Means for Letting Back the Warp in Looms, and for Making
Transverse Ridges or Tucks in the Fabrics Woven thereon.
I WILLIAM BALDWIN of Tardeo, Bombay, India, Weaving Master,, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed to be particularly described and ascertained in and by the following state-
ment:-
My said invention has for its object a device which when actuated by the weft
fork fever of a weaving loom lets back the warp to such a predetermined extent
that the weaving may be resumed without the formation of a ridge or thin place
in the cloth as is apt to occur when the warp is let back to an irregular or im-
proper extent. When the said device is used in combination. with a dobby, shaft
machine Jacquard machine or the like appliance it may be used to produce trans-
verse ridges or tucks in the cloth at any desired distance apart.
In order that my said invention may be more clearly understood I will describe
the same with reference to the accompanying drawing..
Fig. 1 is a side elevation.
Fig. 2 is a cross section through a-y as seen in the direction of the arrow.
In the said device I use a ratchet or toothed wheel mounted on a shaft a
carrying also a pinion e in gear with the taking up mechanism of a loom.
The rotation of the said ratchet wheel is controlled by three pawls hij. One
of the said pawls hereinafter referred to as the driving pawl engages oppositely
to the two others hi which are hereinafter referred to as the fixed and the
swinging control pawls.
The driving pawl falls into gear by gravity which may be aided in some cases
by a spring or balance weight. The control pawls h and i are kept up to their
work by the balance weights .
The driving pawl mounted on the rocking lever drives the ratchet wheel b
in the direction of the arrow as the weaving proceeds. The control pawls h
and i rising over the teeth of the ratchet wheel bin its forward course offers no
bstacle to the rotation thereof.
The bearing which carries the shaft a is attached to a bracket e of such a
shape as admits of it being bolted to a convenient part of the frame f of the loom
on which the mechanism is to be used. An arm or extension 9 from the said bear-
ing d carries the fixed control pawl h and is also provided with a sector slot s for

page_text: Emiting the action of the other or swinging control awl i. The latter is mounted
in a loose arm f which is free to rotate about the driving shaft a or its bearing.
The arm carries a stud or pin t taking into the said sector slot s the length of
which determines the travel of the loose arm f and consequently of the swinging
control pawl i carried thereby. The travel may be varied by liners or stops in the
sector slots and thus the backward rotation of the ratchet wheel may be con-
trolled. The lever w operated by the dobby or corresponding device has a pin
which takes under the driving pawl j and is further connected by a wire or
chain m to the fixed control pawl h. On the said lever we rising the driving pawl j
and the fixed control pawl hare with-drawn from gear and the ratchet wheel is
then free to turn backwards under the tension of the warp. Such backward rota-
tion is however arrested by the swinging control pawli on the stud which
governs it reaching the end of the sector slot s. On the breaking of the
weft or when changing the shuttle the release of the ratchet wheel 6 can be
effected in various ways for example the weft fork lever may be so connected to
the lever to as to move it in the direction of the arrow el when the ratchet wheel b
can run backwards a distance corresponding to the length of the slot-or all the
pawls may be disengaged by hand.
When used in combination with a dobby or the like device the ratchet may be
released at intervals by means of a suitable card or the like automatic device and
thus a ridge or tuck may be produced on any one side of the cloth. In this mode
of using my said invention two warps on separate beams are employed. The warps
are equally combined in the plain part of the cloth and are proportioned as follows
to form the tuck or ridge.
When the ridge has to be formed one half of the warp is lifted clear of the
shuttle and remains stationary while a sufficient amount of plain weaving for
example six picks are put in the other half to form the ridge.
The dobby (or equivalent apparatus) then releases the driving and the fixed
control pawls jih when the ratchet wheel b is pulled round a distance correspond-
ing to six picks as determined by the pin t and sector slots.
The idle warp is now brought into action and is joined into the cloth and the
reeds drawing the woven part along the warps just taken in produce a ridge or
tuck which may be repeated where desired.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I claim
is:-
1. The hereinbefore described combination of devices for letting back the warp
in looms to a predetermined extent substantially as and (for the purpose set forth
and shown.
2. In a loom the combination with a ratchet wheel in gear with the taking up
mechanisin of a loom of pawls hij for driving and controlling the rotation thereof
substantially as and for the purpose set forth and shown.
3. The use in a loom for weaving of the hereinbefore described device of a
ratchet wheel and control pawls in combination with a dobby (or equivalent
apparatus) for intermittently releasing the ratchet wheel for the purpose of pro-
ducing transverse effects in the fabric while being woven substantially as set forth
and shown.
2000
E. T. WHITELOW, A.M. Inst. C.E.
70 Deansgate, Manchester, Agent for the Applicant.