Improvements in Loom Dobbies for the Weaving of Towels and other Fancy Goods.
Year: 1898

page_text: Date of Application, 22nd Oct., 1898
Complete Specification Left, 22nd July, 1899-Accepted, 22nd Nov., 1899
PROVISIONAL SPECIFICATION.
Improvements in Loom Dobbies for the Weaving of Towels and
other Fancy Goods.
We, HERBERT Jonsson, of the Firm of John Johnson and Sons, of Bank Mill,
Lissadel Street, Pendleton, in the County of Lancaster, Manufacturer, and ROBERT
JOHN PRESTWICH, of the same address, Manager, do hereby declare the nature of
this invention to be as follows:-
"
"
In the ordinary loom dobbies constructed for the weaving of only one
tie up,"
or weave, throughout the fabric, a positive, or toothed drive, is sometimes applied
to advance the lag barrel by one lag each time the dobby lifts, in which case
the lags are operated in the reverse direction whenever the loom is turned
back to enable the weaver to find the correct shed," which can always be
done as readily as if the sheds "
were controlled by means of a tappet; but
in most cases, when the loom is "turned back," the lags are moved forward,
owing to the fact that the lag barrel is operated by means of a pushing lever and
ratchet wheel, which is the general method adopted even for dobbies constructed
for the weaving of only one weave, or "tie up," throughout the fabric; as well
as for dobbies that are arranged for the weaving of a fabric which is composed
of two different and distinct weaves, or ties up," whether it is woven by means
of a separate lag barrel being employed for each of the weaves; or by means
of a single lag barrel which is advanced by two lags at each lift of the dobby,
in which case one weave or tie up" can be produced by the first, third, fifth,
seventh etcetera, lags, leaving the second, fourth, sixth, eighth, etcetera, or
alternate lags for the production of the other weave, or
tie up."
"
Our invention relates to loom dobbies and is applicable to either those of the
positive" or to those of the "non-positive" types, which preferably contain only
one lag barrel, but which may also contain more than one lag barrel, or card
cylinder.
The first part of our improvements consists in dispensing with the use of a
pushing lever and ratchet wheel for operating the lag barrel and in substituting
in their stead a specially arranged "positive," or toothed drive, which-in addition
to always correctly advancing the card cylinders, or lag barrels, when the loom is
turned forward, and always correctly reversing the card cylinders, or lag barrels,
whenever the loom is turned back" to enable the weaver to find the correct
shed after either the breakage, or failure, of the weft supply-will enable
the operator, at any time, or at all times, to weave a fabric that is composed
either of one weave; or of two, three, or more, different and distinct weaves,
ties up," which can be changed, or varied, at any time but only according
to the will of the operator.
or
Our further improvements consist in the arrangement of our invention so that,
without the use of a measuring motion, and without having to stop the loom,
the changes of weave can be made automatically, according to any preconcerted
arrangement of the various weaves, provided only that it is never required to.

page_text: weave fewer than two picks, or shots, of any of the weaves selected; and more-
over, if the loom should be reversed for any purpose after it has made any such
automatic change the new weave will be automatically changed back to the
previous weave. If required to do so, in the weaving of fancy cross bordered
towels, handkerchiefs, dusters, et cetera, the dobby can be worked in conjunction
and in perfect unison with any positively driven checking motion, without fear of
their getting out of time with each other; and in such cases, if desired, the
dobby can be arranged to control the changes of the checking motion, or vice
versa; or a controlling motion can be applied that will control every change to be
made by either the dobby, or the checking motion.
In a convenient arrangement for carrying out the first part of our invention,
on either the crank shaft, or the second motion shaft, of the loom, we secure
a wheel, which by means of a chain and pinion secured by set screws, or by
any other positive, or toothed gear-drives, at half the speed of the loom crank,
a cross shaft which is at right angles to the lag barrel shaft and at either end
of the same. On this cross shaft we mount a disc, wheel, cone, &c. on which is
secured one nog, tooth, or projection, or on which are secured two, three, or more
nogs, teeth, or projections in such a position that at every revolution of the cross
shaft they gear into and thereby advance, or reverse, a similar number of con-
secutive teeth in the lag barret pinion which is securely mounted on the lag
barrel shaft. On either side of the dobby we bolt a small bracket, in such a
position that the extreme end of a small flat steel spring secured to this bracket,
will bear on the uppermost of the flat surfaces on a spring wheel, which is
equally divided into as many of these flat surfaces as there are teeth in the lag
barrel pinion, and lag spaces on the circle of the lag barrel; this wheel we
securely mount on the lag barrel shaft, in such a position that the pressure of the
spring, bearing on one of the flat surfaces of the spring wheel, will hold the lag
barrel stationary in such a position that the working lag will be always directly
under the dobby needles, or needle levers, at all times when the nogs on the cross
shaft disc are out of contact with the teeth in the lag barrel pinion. As the lag
barrel pinion contains as many teeth as there are lag spaces on the circle of the
lag barrel, and as every nog on the cross shaft disc gears into a tooth in the lag
barrel pinion and thereby moves it to the extent of one tooth, or lag, the number
of lags to be advanced at each lift of the dobby, or in other words, the number
of different weaves to be woven in the fabric, will determine not only the number
of nogs which the cross shaft disc must contain, but also their correct, or most
suitable, position on the disc, so that they will operate the lag barrel in the time
allowed for doing so, and in order to effect this their pitch must be equal to the
pitch of the teeth in the lag barrel pinion, the required speed, and also the
diameter, of which will determine the exact distance between the centre of the cross
shaft and the centres of the nogs, because their period of contact with the lag
barrel pinion must only be between the time when the top knife of the dobby,
with all the required hooks securely attached, has commenced its forward
movement, and the time when the bottom knife has returned to the position in
which it receives the lower hooks.
As at each lift of the dobby, the lag barrel has to be advanced by as many lags
as there are different varieties of weaves, it will be obvious that the greater
the number of weaves, the greater will be the surface speed of the lag barrel,
therefore, whenever it is desired to produce more than three different and distinct
varieties of weave, it is advisable either to employ additional positively driven
lag barrels which can be supported by means of a circle, quadrant, or oscillating
lever, but in the latter case the number of lag barrels is of necessity limited, owing
to the fact that they must each have different points of contact with the dobby
needles, or needle levers-or else to adopt the alternative of discarding the lag
barrel in favour of a positively driven jacquard cylinder with a different line of
holes for each variety of weave to be produced, in which case either the needle
carrier, or the cylinder must be movable.

page_text: In a convenient arrangement for carrying out our further improvements-by
means of which we are able to dispense with the use of a measuring motion-and
can automatically change, or vary, the different weaves whilst the loom is in
motion, we control the number of nogs, teeth, or projections that shall actually
come in contact with the lag barrel pinion at any time, and at all times, which
number of course depends on the number of lags to be advanced at each lift
of the dobby. This we do either by varying the leneth of each of the nogs on
the previously referred to disc, wheel, cone, &c. which, instead of being mounted
on the cross shaft in a fixed and permanent position, contains a rectangular key
bed on its bearing surface that loosely fits over a rectangular feather on the cross
shaft, along which we can slide the disc into such positions that only the
required number of the longer nogs will come in contact with the teeth of the
lag barrel pinion, the correct positions of the nogs being assured by means
of the feather and key bed, which effectually prevent any lateral movement of the
disc on the cross shaft. Or else-instead of sliding the disc bodily along the cross
shaft--we make use of a disc which is composed of two, or more, parts or sections,
to each of which sections we secure one nog, tooth, or projection. The first of
these sections is permanently keyed on to the cross shaft in such a position that at
every revolution of the cross shaft, and at about mid-time during the time allowed
for such contact, its nog will always gear into a tooth in the lag barrel pinion, and
will thereby move the lag barrel to the extent of one tooth or lag, in the required
direction. The second of these sections is also mounted on the cross shaft along
which it can slide away from its working position, which is against the first
section on the bearing surface of this second section of the disc there is a
rectangular key bed that, (loosely,) fits over a rectangular feather on the cross
shaft, in order to prevent any lateral movement of this second section of the
disc, and also to hold it in such a position that, when its nog is
required to operate, it will do so before the nog which is secured on the
first section. The third of these sections, instead of being mounted on the cross
shaft, is mounted on the bush of the second section along which it can slide away
from its working position, which is against the working position of the second
section; on the hearing surface of this third section of the disc there is also a
rectangular key bed that, loosely, fits over a rectangular feather on the bush of
the second section, in order to prevent any lateral movement of this third section
of the disc, and also to hold it in such a position that, when its nog is required
to operate, it will do so after the nog which is secured on the first section. The
fourth of these sections-if a fourth section is required-is mounted on the bush
of the third section, in precisely the same manner as the third section is mounted
on the bush of the second section.
:
It is obvious that there are alternative methods whereby practically identical
results could be obtained; for instance, our method could be almost entirely
reversed by utilizing a variable, or sectional, pinion on the lag barrel shaft and
mounting a permanently fixed driver on the cross shaft.
Thus it will be seen that when, and as, required we can always vary the number
of nogs &c. that shall come in contact with the lag barrel pinion-and conse-
quently the number of lags that will be advanced on the lag barrel at each. and
every, lift of the dobby--which we do either by sliding the disc, or by sliding a
part, or parts, of the disc, in order to effect, regulate, and thoroughly control
very such movement of the disc, or every such movement of one, or more, of its
parts, we place on the disc, or on each of its movable parts, either a grooved collar,
or other projection which is either clipped, or pushed, by levers, or by needles,
that are operated, whenever a change is required, either by pegged lags, or by
perforated cards, placed on a small auxiliary lag barrel, or card cylinder, that is
driven by a positive, or toothed, gear off the previously referred to cross shaft.
Description of the lag barrel, and method of pegging the lags for the production
of the various numbers of different and distinct varieties of weave:-
The lag barrel may carry any workable number of lags, and it may also be

page_text: 66
of any workable size, but preferably it should be so spaced that in its entire circle
it will contain twelve lag spaces at equal distances apart. There are several
reasons for selecting a twelve lagged barrel, one reason being that in consequence
of the lag barrel having to revolve at a greater speed, the lags are liable to jump
on to other than their own spaces when twelve, or more than twelve, lags are
placed on a barrel which contains fewer than twelve lag spaces; another reason
being that twelve is the least common multiple of one, two, three, four, conse-
quently twelve is the minimum number of lags that can be used to produce,
when and as required, a fabric containing either one weave, or two, three, or
four, different and distinct varieties of weave, in addition to weaves, which only
contain two picks to the complete weft pattern, such as a "matting" or "plain,"
which can be produced by keeping the lag barrel stationary, and allowing any
one of the twelve lags that may happen to be suitably pegged, to remain in
operation. In pegging the ties up "of the various weaves, so that only the
minimum number of lags shall be used, we must remember that the lag barrel will
be advanced by as many lags as there are different varieties of weaves to be woven,
which will enable us to ascertain the exact order in which the lags will operate
the dobby, so that we can peg them accordingly. Thus if we have only to produce
one weave of cloth, with one set of pegged lags, the lag barrel will only be
advanced by one lag at each lift of the dobby, so that every lag will operate the
dobby in direct rotation, and we must therefore peg on every consecutive lag
in the usual way. If we have to produce two different weaves of cloth, with one
set of pegged lags, the lag barrel will be advanced by two lags, at each lift of
the dobby, so that every second, or alternate, lag will operate the dobby in
direct rotation and we must therefore peg, on every second, or alternate, lag in
direct rotation, the consecutive lags required for each one of the different weaves:
so that the first weave must be pegged on the first third, fifth, seventh &c. lags,
and the second weave must be pegged on the second, fourth, sixth, eighth, &c.
lags therefore, if the change from one weave on to the other weave has to be
made by hand when the loom is stopped, such change can always be effected by
moving the lag barrel one lag, either backward, or forward, at the option of the
weaver; but if the change has to be made automatically, and without stopping
the loom, it should only be done by a forward movement of the lag barrel, there-
fore, instead of advancing the lag barrel by two lags, it must only be advanced
by one lag, at its movement, when the change of weave has to be effected. If we
have to produce three, different weaves of cloth, with one set of pegged lags,
the lag barrel will be advanced by three lags at each lift of the dobby, so that every
third lag will operate the dobby in direct rotation, and we must therefore peg, on
every third lag in direct rotation, the consecutive lags required for each one of
the different weaves; so that the first weave which we will presume to be "huck"
must be pegged on the first, fourth, seventh, tenth, &c. lags; and the second
weave, which we will presume to be a "twill" must be pegged on the second,
fifth, eighth, eleventh, &c. lags; whilst the third weave, which we will presume
to be a
matting" or "plain," must be pegged on the third, sixth, ninth, twelfth,
&c. lags; therefore if the change from any one of the three weaves on to any
other of the three weaves has to be made by hand when the loom is stopped, cach
one of such changes can always be effected in two different ways, at the option of
the weaver, namely by moving the lag barrel either one lag backward, or two
lags forward, or else vice versa, according to the change required; but if the
change has to be made automatically, and without stopping the loom, it should
only be done by a forward movement of the lag barrel, therefore, instead of
advancing the lag barrel by three lags, at its movement when the change has to
be effected, it must only be advanced by one lag, or by two lags, according to
the change of weave required.
For example: If the dobby be weaving say "huck" on the first, fourth,
seventh, tenth. &. lags, an advance of one lag would bring the second, fifth,
eighth, cleventh, &c. lags into operation, in which case the dobby would weave

page_text: say
twill," whereas an advance of two lags would have brought the third, sixth,
ninth, twelfth, &c. lags into operation, in which case the dobby would weave say
"matting."
"
Dated this 514 love of stab 1000
H. B. BARLOW & GILLETT,
Agents for Applicants,
Improvements in Loom Dobbies for the Weaving of Towels and
other Fancy Goods.
We, HERBERT JOHNSON, of the Firm of John Johnson and Sons, of Bank Mill,
Lissadel Street, Pendleton, in the County of Lancaster, Manufacturer, and ROBERT
JOHN PRESTWICH, of the same address, Manager, 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:—
"
In the ordinary loom dobbies constructed for the weaving of only one
tie up,"
or weave, throughout the fabric, a positive, or toothed drive, is sometimes applied
to advance the lag barrel by one lag each time the dobby lifts, in which case
the lags are operated in the reverse direction whenever the loom is turned
back to enable the weaver to find the correct "shed," which can always be
done as readily as if the "sheds" were controlled by means of a tappet; but
in most cases, when the loom is "turned back," the lags are moved forward.
owing to the fact that the lag barrel is operated by means of a pushing lever and
ratchet wheel, which is general method adopted even for dobbies constructed
for the weaving of only one weave, or tie up, throughout the fabric; as well
as for dobbies that are arranged for the weaving of a fabric which is composed
of two different and distinct weaves, or ties up, whether it is woven by means
of a separate lag barrel being employed for each of the weaves: or by means
of a single lag barrel which is advanced by two lags at each lift of the dobby,
in which case one weave or tie up can be produced by the first, third, fifth,
seventh, etcetera, lags, leaving the second, fourth, sixth, eighth, etcetera, or
alternate lags for the production of the other weave, or "tie up."
وو
Our invention relates to loom dobbies and is applicable to either those of the
positive or to those of the "non-positive" types, which preferably contain only
one lag barrel, but which may also contain more than one lag barrel, or card
cylinder.
The first part of our improvements consists in dispensing with the use of a
pushing lever and ratchet wheel for operating the lag barrel and in substituting
in their stead a specially arranged positive, or toothed, drive, which, in addition
to always correctly advancing the card cylinders, or lag barrels, when the loom is
turned forward, and always correctly reversing the card cylinders, or lag barrels
whenever the loom is "turned back" to enable the weaver to find the correct
"shed
after either the breakage or failure of the weft supply-will enable
the operator, at any time, or at all times, to weave a fabric that is composed
either of one weave; or of two, three, or more, different and distinct weaves,
ties up," which can be changed or varied at any time and in any order but
only according to the will of the operator.
or
Our further improvements consist in the arrangement of our invention so that,
without the use of a measuring motion, and without having to stop the loom,
the changes of weave can be made automatically, according to any preconcerted
arrangement of the various weaves, provided only that it is never required to

page_text: weave fewer than two picks, or shots, of any of the weaves selected; and more-
over, if the loom should be reversed for any purpose after it has made any such
automatic change the new weave will be automatically changed back to the
previous weave. If required to do so, in the weaving of fancy cross bordered
towels, handkerchiefs, dusters, etcetera, the dobby can be worked in conjunction,
and in perfect unison with any positively driven checking motion, or change box
motion without fear of their getting out of time with each other and in such
cases, if desired, the dobby can be arranged to control the changes of the checking
motion or vice versa; or a controlling motion can be applied that will control
every change to be made by either the dobby, or the checking motion.
A convenient arrangement for carrying out the first part of our invention is
shown on Sheet 1 of the accompanying drawings in which Figure 1 is a side
clevation, Figure 2 a plan and Figure 3 a sectional view of a loom dobby fitted
with our improved positive drive for operating the lag barrel and Figure 4 is a
detail view of the spring wheel.
In these views,-1 denotes a cross shaft which is set at right angles to the
end of the lag barrel 2 and is driven by means of a chain 3 and chain wheels 4
(only one of which is shown) from the crank shaft and at one half its speed. On
the cross shaft 1 we secure a bevel wheel 5 which drives by a bevel pinion 6 on
the boss of which are formed or secured three (in this instance) nogs or teeth 7
..which gear into and at every revolution of the cross shaft 1 advance a similar
number of consecutive teeth in the lag barrel pinion 8 which is fitted to slide on
the squared end of the barrel shaft 9.
To the side of the dobby we bolt a small bracket 10 in such a position that
the curved end of a flat steel spring 11 secured to this bracket will bear on the
uppermost of the correspondingly shaped surfaces on a spring wheel 12 (see
Fig. 4) which is equally divided into as many of these surfaces as there are
teeth in the lag barrel pinion 8 and lag spaces on the circumference of the
lag barrel 2. We securely mount the wheel 12 in such a position that the pressure
of the spring 11 will hold the lag barrel 2 stationary in its true position so that
the working lag will always be under the dobby needles or needle levers at all
times when the nogs 7 are out of gear with the teeth on the lag barrel pinion S.
As the lag barrel pinion 8 has as many teeth as there are lag spaces on the
circumference of the lag barrel 2, and as every nog 7 that gears into a tooth
in the lag barrel pinion thereby moves it to the extent of one tooth, or lag, the
number of lags to be advanced at each lift of the dobby will determine the
number of nogs 7 that must gear into teeth in the lag barrel pinion 8 and
the number of different weaves to be woven in the fabric will determine not
only the number of nogs 7 but also their correct or most suitable position rela-
tively to the lag barrel pinion so that they will operate the lag barrel 2 in the time
allowed for so doing; and in order to effect this their pitch must be equal to the
pitch of the teeth in the lag barrel pinion S, the required speed, and also the
diameter of which will determine the exact distance between the centre of
the cross shaft 1 and the centres of the nogs 7 because their period of contact
with the lag barrel pinion 8 must only be between the time when the top
knife of the dobby with all the required hooks securely attached has commenced
its forward movement, and the time when the bottom knife has returned to the
position in which it receives the lower hooks, or vice versa.
As at each lift of the dobby, except when a change of weave is being effected,
the lag barrel has to be advanced by as many lags as there are different varieties
of weaves, it will be obvious that the greater the number of weaves the greater
will be the surface speed of the lag barrel.
«
'
The arrangement illustrated by Sheet 1 of the drawings is adapted for plain
looms and is designed for the weaving of three different and distinct varieties
ties up," which can be changed, or varied at any time by the
operator, who effects all such changes by hand whilst the loom is running;
unless, if just when a change is required, it is found necessary to stop the loom
of weave, or

page_text: for other purposes such as to replenish the weft supply, or to change the counts,
or colour of the weft, etcetera, when all such changes of weave should be made
by the mechanism devised for changing the weave whilst the loom is stopped. In
producing three different weaves of cloth with one set of pegged lags, we utilise
the first, fourth, seventh, tenth, etcetera lags, for the first weave; the second
fifth, eighth, eleventh, etcetera lags, for the second weave; and the third, sixth,
ninth, twelfth, etcetera lags, for the third weave; consequently we peg on every
third lag in direct rotation the consecutive lags required for each one of the
different weaves, and continue weaving any one of these weaves
we allow three nogs 7 to come in contact with pinion 8 and
thereby advance lag barrel 2 by three lags at each lift of the dobby.
to
To effect
a change of weave, we change the series of lags that operate the dobby by allowing
during the one lift of the dobby when the change of weave is effected) only
two nogs, or only one nog 7 to come in contact with pinion 8 and thus only
advance lag barrel 2 by two lags, or by one lag, according to the change of
weave required. To this end we subdivide, by imaginary lines, the face of the nog
wheel 7 into three equal parts, each of which equal parts is at least as wide as
the face of the teeth of pinion 8; one of the nogs 7, preferably the centre
one, is a broad tooth which extends over all three of these equal parts, the second
nog is a narrower tooth which extends over the two equal parts nearest to the
dobby, whilst the third nog is a still narrower tooth which only extends over
that equal part of the nog wheel 7 which is nearest to the dobby, and which
is the working position at all times, except whilst a change of weave is being
made, which is effected by sliding pinion 8 along the squared end of the lag
barrel shaft 9 so that only two nogs, or one nog, of nog wheel 7, according to the
change required, comes into contact with pinion S.
To slide the pinion 8 along the squared end of the lag barrel shaft 9 we
employ a clutch lever 15 engaging the boss of the sliding pinion 8 and fixed on
a sliding shaft 16 on which is coiled a spring 17 confined between the dobby frame
side and a collar 18 fixed on the shaft 16.
An
arm 19 with al forked end engaging the sliding shaft 16 is
fixed on the sliding rod 20, (which has a movement equal to (wo of
the three equal subdivisions of the face of nog 7) and a second arm 21 with a
forked end engaging the sliding rod 20 is fixed on a second sliding rod 22 (which
has a movement equal to one of the three equal subdivisions of the face of nog 7).
By pressing in the knob at the end of the sliding rod 22, and holding it in that
position during one complete revolution of the cross shaft 1, the arm 21 moving
with the rod slides the rod 20, and its arm 19 bearing against the collar 18
moves the shaft 16 against the resistance of the spring 17 and thereby moves the
lag barrel pinion 8 a distance equal to one third of the face of nog wheel 7 and
consequently out of reach of the narrowest of the three nogs 7 but not out of
reach of the other two nogs, so that at the next revolution of the cross shaft 1
the pinion S is turned only two teeth and the lag barrel 2 only two spaces.
By pressing in the knob at the end of the sliding rod 20, and holding it in that
position during one complete revolution of the cross shaft 1, the arm 19 moving
with the rod and bearing against the collar 18 moves the shaft 16 against the
resistance of the spring 17 and thereby moves the lag barrel pinion 8 a distance
equal to two thirds of the face of nog wheel 7 and consequently out of reach
of the two shortest of the three nogs 7, but not out of reach of the longest nog,
so that at the next revolution of the cross shaft 1 the pinion 8 is turned only one
tooth and the lag barrel 2 only one space.
When the hand is taken off either knob 20 or 22, the spring 17 slides back the
shaft 16 and rods 20 and 22, consequently the pinion S is again brought within
reach of all three nogs 7, in which position it will remain and the lag barrel will
continue to be turned three spaces at a time until the next change of weave
is made.
If, when a change of weave has to be effected, it is necessary to stop the loom

page_text: for any purpose such as to replenish the weft supply, or to change the counts
or colour of the weft simultaneously with the change of the weave or " tie up" of
the fabric, instead of effecting the latter change when the loom is running by
pressing either knob 20 or 22 according to the change required, the operator will
stop the loom at any of the alternate picks when nog wheel 7 is out of contact
with pinion 8 and effect the change of weave by turning the handle of hand
shaft 13 once completely round, either backward or forward according to the
change of weave required. To this end a hand shaft 13, at the front of which
is a handle, is mounted preferably_parallel with lag barrel 2 and in such a
position that its centre is in the same horizontal plane as the centres of the lag
barrel shaft 9 and the nog wheel 7; on the far end of this shaft 13 a nog 14
identical with nogs 7 is secured in such a position that when the handle at the
opposite end of the shaft 13 is turned completely round the nog 14 will gear
into the lag barrel pinion 8 and so advance or move back the pinion 8 one tooth
and the lag barrel 2 one space, after which nog 14 is held out of contact with
pinion 8 by the weight of the handle on the opposite end of hand shaft 13.
On Sheet 2 of the accompanying drawings we illustrate a convenient arrange-
ment adapted for "check looms" whereon we carry out our further improvements
by means of which we are able to dispense with the use of a measuring motion
and can automatically change or vary the different weaves whilst the loom is in
motion.
Figure 5 is a side elevation, Figure 6 a plan and Figure 7 a sectional view of
a loom dobby with a positively driven lag barrel combined with a check motion
for automatically effecting the changes in the weave by adjusting the position
of the lag barrel pinion 8 and moving it during one complete revolution of the
cross shaft 1 from its normal or three tooth position to the two tooth or one tooth
position whereby the lag barrel is turned two spaces, or one space instead of
three spaces.
To this end we employ a sliding peg wheel 23 fitted to slide on a feather key
in the cross shaft 1 and actuated at intervals by a series of connecting rods and
levers 24 from a lever 25 which is fulcrumed at 26 and is pivoted at 27 to the
middle check needle 28 whenever a change of weave has to be effected and conse-
quently when there are no holes opposite to it in two consecutive links of the
pattern chain forming part of the check motion 29. When the lever 25 is thus
actuated the connections slide the rotating peg wheel 23 into gear with a star
wheel 30 fixed on the axle of an auxiliary chain barrel 31 fitted with two pattern
chains 32 and thus the star wheel 30 and chain barrel 31 are turned one tooth and
one link respectively. The pattern chains 32 have links or risers of two sizes
or heights as may be clearly seen on reference to Fig. 7 and resting on these
chains 32 are two elbow levers 33, 34 the other ends of which are connected by
links 35, 36 to two studs 37, 38 fixed adjustably upon the sliding shaft 16.
Consequently when a riser link passes under either of the levers 33, 34 it is
raised and by its connection 35, or 36 moves the sliding shaft 16 against the
resistance of the spring 17 and thereby slides the lag barrel pinion 8 from the
three tooth into the two tooth or one tooth position as the case may be, in which
position it remains during one contact with the nog wheel 7 after which the
checking motion needle 28 is again depressed and consequently the star wheel 30
and the auxiliary chain barrel 1 are again turned one tooth and one link respec-
tively, which causes the riser link to pass away from under the elbow lever
when the spring 17 returns the lag barrel pinion 8 into its normal or three
tooth position.
It will thus be seen that when and as required we can always vary the number
of nogs that shall come in contact with and turn the lag barrel pinion 8 and
consequently the number of lags that will be advanced on the lag barrel 2 at each
and every lift of the dobby and this we effect by hand either when the loom is
stopped or in motion in the arrangements illustrated by Sheet 1 or automatically
in the arrangement illustrated by Sheet 2 of the accompanying drawings.

page_text: Description of the lag barrel, and method of pegging the lags for the production
of the various numbers of different and distinct varieties of weave:-
ور
"
The lag barrel 2 may carry any workable number of lags and it may also be
of any workable size, but preferably it should be so spaced that in its entire circle
it will contain twelve lag spaces at equal distances apart.
There are several
reasons for selecting a twelve lagged barrel, one reason being that in consequence
of the lag barrel having to revolve at a greater speed, the lags are liable to jump
on to other than their own spaces when twelve, or more than twelve lags are
placed on a barrel which contains fewer than twelve lag spaces: another reason
being that twelve is the least common multiple of one, two, three, four, conse-
quently twelve is the minimum number of lags that can be used to produce,
when and as required, a fabric containing either one weave, or two, three, or
four different and distinct varicties of weave, in addition to weaves which only
contain two picks to the complete weft pattern, such as a matting or "plain,"
which can be produced by keeping the lag barrel stationary, and allowing any
one of the twelve lags that may happen to be suitably pegged, to remain in
operation. In pegging the "ties up of the various weaves, so that only the
minimum number of lags shall be used, we must remember that the lag barrel will
be advanced by as many lags as there are different varieties of weaves to be woven,
which will enable us to ascertain the exact order in which the lags will operate
the dobby, so that we can peg them accordingly. Thus if we have only to produce
one weave of cloth, with one set of pegged lags, the lag barrel will only be
advanced by one lag at each lift of the dobby, so that every lag will operate the
dobby in direct rotation, and we must therefore peg on every consecutive lag
in the usual way. If we have to produce two different weaves of cloth, with one
set of pegged lags, the lag barrel will be advanced by two lage, at each lift of
the dobby so that every second, or alternative lag will operate the dobby in
direct rotation and we must therefore peg on every second, or alternate lag in
direct rotation, the consecutive lags required for each one of the different weaves;
so that the first weave must be pegged on the first, third, fifth, seventh &c. lags,
and the second weave must be pegged on the second, fourth, sixth, eighth &c.
lags; therefore if the change from one weave on to the other weave has to be
made by hand when the loom is stopped, such change can always be effected by
moving the lag barrel one lag, either backward, or forward, at the option of the
weaver; but if the change has to be made automatically, and without stopping
the loom, it should only be done by a forward movement of the lag barrel, there-
fore, instead of advancing the lag barrel by two lags, it must only be advanced
by one lag, at its movement, when the change of weave has to be effected. If we
have to produce three different weaves of cloth with one set of pegged lags,
the lag barrel will be advanced by three lags at each lift of the dobby, so that every
third lag will operate the dobby in direct rotation, and we must therefore peg on
every third lag in direct rotation, the consecutive lags required for each one of
the different weaves; so that the first weave which we will presume to be "huck"
must be pegged on the first, fourth, seventh, tenth, &c. lags; and the second
weave, which we will presume to be a "twill" must be pegged on the second,
fifth, eighth, eleventh, &c. lags; whilst the third weave, which we will presume
to be a matting" or plain," must be pegged on the third, sixth, ninth, twelfth
&c. lags; therefore if the change from any one of the three weaves on to any
other of the three weaves has to be made by hand when the loom is stopped, each
one of such changes can always be effected in two different ways, at the option of
the weaver, namely by moving the lag barrel either one lag backward, or two
lags forward, or else vice versa, according to the change required; but if the
change has to be made automatically, and without stopping the loom it should
only be done by a forward movement of the lag barrel, therefore, instead of
advancing the lag barrel by three lags, at its movement when the change has to
be effected, it must only be advanced by one lag, or by two lags, according to
the change of weave required.
"
"

page_text: For example:-If the dobby be weaving say "huck" on the first, fourth,
seventh, tenth, &c. lags, an advance of one lag would bring the second, fifth,
eighth, eleventh, &c. lags into operation, in which case the dobby would weave
say twill," whereas an advance of two lags would have brought the third, sixth,
ninth, twelfth, &c. lags into operation, in which case the dobby would weave say
matting."
66
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is:-
weaves or
"
1. Weaving with loom dobbies of either the "positive" or non-positive
types, a fabric that is composed of either two, three or more different and distinct
ties up
"which weaves can be changed or varied either automatically
or by hand, at any time and in any order according to the will of the operator,
who can make any such change without stopping the loom and without having to
make any re-arrangement of lags, cards, barrels or cylinders.
"
"
2. The application to loom dobbies of either the "positive" or non-positive
types when arranged to weave a fabric that is composed of more than one
distinct weave or tie-up of a positive or toothed drive for operating the
lag barrel or barrels, or the card cylinder or cylinders, whereby the use of pushing
or pulling levers and ratchet wheels for operating the lag barrels or card
cylinders may be entirely dispensed with, and whereby the operator will be
able at any time to weave a fabric that is composed either of one weave, or of two,
three or more different and distinct weaves or ties up" which can be changed
or varied at any time but only according to the will of the operator who can make
any such change by hand either when the loom is stopped or in motion; or the
changes can be made automatically by a suitable pattern motion substantially
as herein set forth.
32
3. Mechanism whereby the operator can change or vary the weave or " tie
up of the fabric by hand when the loom is stopped, which mechanism is arranged
to work in combination with any conveniently arranged positive or toothed gear
for operating the lag barrel or barrels or the card cylinder or cylinders sub-
stantially as herein described and as illustrated on Sheet 1 of the accompanying
drawings.
"
tie up
"
4. Mechanism whereby the operator can change or vary the weave or
of the fabric by hand when the loom is running, which mechanism is arranged
to work in combination with any conveniently arranged positive or toothed drive
for operating the lag barrel or barrels, or the card cylinder or cylinders sub-
stantially as herein described and as illustrated on Sheet 1 of the accompanying
drawings.
5. Mechanism whereby the weave or
tie up"
of the fabric can be changed or
varied, according to any preconcerted plan, automatically when the loom is
running, which mechanism is arranged to work in combination and in perfect
unison with any conveniently arranged positively driven checking motion, and
in combination, and in perfect unison with any conveniently arranged positive or
toothed drive for operating the lag barrel or barrels, or the card cylinder or
cylinders substantially as herein described and as illustrated in the accompanying
drawings.
6. The several combinations and arrangements of parts embodying our improve-
ments in loom dobbies for weaving fancy goods substantially as and for the
purposes herein described and as shown on the drawings.
Dated this 21st day of July 1899.
H. B. BARLOW & GILLETT,
Agents for Applicants,
17, St. Ann's Square, Manchester.