Year: 1896

page_text: I, HERMANN STAUBLI, of Horgen, bei Zurich, Switzerland, Manufacturer of
loom-utensils, do hereby declare the nature of this invention to be as follows:-
This invention relates to an improved dobby for looms for weaving wherein the
lattice barrel, dependent from the loom, can be positively moved forwards and
backwards in such a manner that the pegged lattices are always moved
automatically forwards or backwards in accordance with the loom.
The advantage derived in this invention over the dobbies hitherto in use
wherein the lattice barrel, y means of pawl and ratchet actuated from the loom is
positively moved forwards but not backwards, is that the lattice barrel moves
forwards and backwards with the loom, which entirely obviates looking for the
weft, which is a source of great trouble and loss of time to the weaver.
In this improved dobby the lattice barrel receives a partial turn every pick
whether the loom works forwards or backwards, whilst hitherto it rotated only
during the forward movement of the loom; as hereinbefore described when
working backwards it was necessary to turn the lattice barrel back to allow of
setting the lattice.
Annexed drawing shows the improved dobby constructed in accordance with
one form of my invention.
Fig. 1 being a front view of the same, Fig. 2 a plan of the lattice barrel,
weighted levers and lattice barrel motions, Fig. 3 a side view of the latter. Fig. 4
of the wheel, tooth pawl and retaining device of the barrel motion alone. Fig. 5
shows the lattice barrel with two adjacent weighted levers g', g, one of which g¹
is in its highest position and the other g in its lowest position. Fig. 6 shows the
lattice barrel as having received a partial turn, being raised and g' lowered.
This improved dobby is constructed after the type known as "universal
dobbies," i.e., is such as can be used for upshedding as well as up and down shedding
and which has a double lift. 2.
In this improved dobby, balks bare, employed as usually to actuate the lifting
levers a from which the shafts are suspended and the said balks being each
furnished with a pair of catches c, c, are adapted to be engaged by two recipro-
cating knives d, d', as soon as the respective catch has been brought into the
position for catching as usual by means of the lattice barrel G and the weighted
levers gl, gwhich latter act upon the needles. The knives are actuated by means
of hooked rods e from a T lever f in such a manner that they move in opposite
directions which produces a double lift, so that when the one knife moves back
for closing the shed formed thereby, the other knife will be moving forwards to
form the next shed as is well known.

page_text: Thus in my invention the dobby is so arranged that the lattice barrel G is
positively moved by the loom each pick of a revolution during the forward as
well as the backward movement of the loom. For this purpose a spur wheel h
having 16 teeth is fixed upon the axis of the lattice barrel G and each time moved
one tooth by means of wheels hereinafter more fully described and actuated by
chain gearing from the loom. Such movement takes place as soon as one of the
knives d, d, gets behind the catches, the moment when the crank of the dobby,
which is fixed unon the lower loom shaft, passes one of its dead points. The
contact surface 1-2 of the weighted levers g, are so profiled that the lever can
only descend after every two movements, i.e. turn of the lattice barrel,
so that the weighted lever will be retained in its upper position two successive
sixteenths of a turn. This will be clearly seen from. Fig. 5, the full lines showing
the position of the peg after the first sixteenth of a turn (lifting the weight)
whilst the dotted lines show its upper position after the second sixteenth of a turn
where it is retained. As will be readily seen from Figs. 5 & 6, the contact surfaces
of each 'two weighted levers g', gare displaced in relation to each other, the
contact surface of the lever g₁ which acts upon the catches c being further away
from the shaft g than that of the lever g which acts upon the catch o¹ and such
displacement being exactly equal to the distance travelled by the peg during one
sixteenth of a turn, i.e. one movement of the lattice barrel. The disengagement
and engagement of the catches will thus in this invention not take place
simultaneously as in other dobbies where the contact surface be in a straight line,
the upper catch being already engaged whilst the lower one is still disengaged, i.e.
remains in its upper position and the respective knife is still moving forward and
rice versa, Figs. 5 & 6. By the working of the upper catches and the respective knife
with the lower catch and the respective knife, an alternate movement, i.e. an
engagement and disengagement is obtained whereby the power required by the
dobby is divided and not concentrated at one point of the working of the dobby
as is the case when the upper and lower catches engage and disengage
simultaneously.
As shown in Figs. 5 & 6 the knives during
point owing to the same moving the distance
necessary to ensure a correct engagement and
(Fig. 6.)
their travel have a certain dead
or a further on than would be
moving of the respective catch
Referring to the special construction of the device for the positive movement
of the lattice barrel (one sixteenth of a turn each pick) the wheel h which has
sixteen teeth, is moved by a suitable medium, actuated from the loom by bevel
wheels i, ', rotated by a chain and the chain wheel k¹, in such a manner that
same will turn and move the wheel h one tooth each pick. In the present instance
the said medium is a tooth pawl mounted upon the boss of the wheel i¹ which
after and before each movement takes up the position shown in Fig. 4, the position
of the wheel being always such that a fine drawn through the centres of the pawl
shaft and the lattice barrel or waeel shaft will pass through the middle of a tooth
of the wheel h. After each turn the wheel is momentarily locked in position in
the present instance by means of a roller m carried by a lever n placed under the
influence of a spring o secured to the frame of the dobby, which roller engages
between the teeth of the wheel h, Fig. 4. When the said wheel moves it raises
the roller m out of gear and the tension of the spring o will then cause the same
to fall into the next tooth space.
P
The shaft carrying the wheels i&is mounted in a bracket g secured to the
foot r of the dobby. This bracket is rendered adjustable in three directions in
such manner that the respective wheels and lattice barrel motion may be brought
in proper gear. The chain wheel may be also adjusted on the shaft right
and left so as to provide room for the chain k.
It will be evident that as already explained and will be easily seen from the
arrangement of the various parts, the lattice barrel may be moved in accordance
with the direction in which the loom moves, i.e. forwards as well as backwards,

page_text: the profile of the contact surfaces of the weighted levers and the described con-
struction of the lattice barrel motion being such, that when moving backwards
all parts of the latter will work exactly as correctly as when moving forwards.
In looms which are driven from the left, the chain will be crossed and in looms
5 driven from the right it will be employed open, so that pegged pattern can be used
in left as well as right hand looms without having to alter same.
Dated this 1st. day of September. 1896.
F. BOSSHARDT & CO.
Agents to Applicant.
Improvements in Dobbies for Looms for Weaving.
I, HERMANN STAUBLI, of Horgen, bei Zurich, Switzerland, Manufacturer of
loom-utensils, 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 an improved dobby for looms for weaving wherein the
lattice barrel, dependent from the loom, can be positively moved forwards and
backwards in such a manner that the pegged lattices are always moved
automatically forwards or backwards in accordance with the loom.
The advantage derived in this invention over the dobbies hitherto in use
wherein the lattice barrel, by means of pawl and ratchet actuated from the loom is
positively moved forwards but not backwards, is that the lattice barrel moves
forward and backwards with the loom, which entirely obviates looking for the
weft, which is a source of great trouble and loss of time to the weaver.
In this improved dobby the lattice barrel receives a partial turn every pick
whether the loom works forwards or backwards, whilst hitherto it rotated only
during the forward movement of the loom ; as hereinbefore described when
working backwards it was necessary to turn the lattice barrel back to allow of
setting the lattice.
Fig. 1 of the drawings filed with the Provisional Specification being a front.
view of the same, Fig. 2 a plan of the lattice barrel, weighted or tappet levers and
lattice barrel motions, Fig. 3 a side view of the lattice. Fig. 4 of the wheel,
tooth pawl and retaining device of the barrel motion alone. Fig. 5 shows the
lattice barrel with two adjacent weighted or tappet levers g¹, 92, one of which g¹ is
in its highest position and the other 2 in its lowest position. Fig. 6 shows the
lattice barrel as having received a partial turn, g² being raised and g¹ lowered.
This improved dobby is constructed after the type known as "universal
dobbies," i.e. such as can be used for upshedding and which has a double lift.
In this improved dobby, balks b are employed as usually to actuate the lifting
levers a from which the shafts are suspended and the said balks being each
furnished with a pair of catches c, c¹, are adapted to engage two recipro-
cating knives d, d, as soon, as the respective catch has been brought into the
position for catching as usual by means of the lattice barrel G and the weighted
or tappet levers g', which latter act upon the needles. The knives are actuated
by means of hooked rods e from a T lever f in such a manner that they move
in opposite directions which produces a double lift, so that when the one knife

page_text: moves back for closing the shed formed thereby, the other knife will be moving
forwards to form the next shed as is well known.
Thus in my invention the dobby is so arranged that the lattice barrel Gis
positively moved by the loom each pick of a revolution during the forward as
well as the backward movement of the loom. For this purpose a spur wheel h
having 16 teeth is fixed upon the axis of the lattice barrel G and each time moved
one tooth by means of wheels hereinafter more fully described and actuated by
chain gearing from the loom. Such movement takes place as soon as one of the
knives d, d, gets behind the catches, the moment when the crank of the dobby,
which is fixed upon the lower loom shaft, passes one of its dead points. The
contact or cam surfaces 1-2 of the weighted or tappet levers g', g, are se profiled
that the lever can only descend after every two movements, i.e. turn of
the lattice barrel, so that the weighted or tappet lever will be retained in its upper
position two successive sixteenths of a turn. This will be clearly seen from
Fig. 5, the full lines showing the position of the peg after the first sixteenth of a
turn (lifting the weight) whilst the dotted lines show its upper position after
the second sixteenth of a turn where it is retained. As will be readily seen from
Figs. 5 & 6, the contact or cam surfaces of each two weighted or tappet levers g', 9
are displaced in relation to each other, the contact or cam surface of the lever g'
which acts upon the catches c being further away from the shaft y than that of the
lever which acts upon the catch e and such displacement being exactly equal
to the distance travelled by the peg during one sixteenth of a turn, i.e. one move-
ment of the lattice barrel. The disengagement and engagement of the catches
will thus in this invention, not take place simultaneously as in other dobbies
where the contact surface be in a straight line, the upper catch being already
engaged whilst the lower one is still disengaged, i.e. remains in its upper position
and the respective knife is still moving forward and vice versa, Figs. 5 & 6. By
the working of the upper catches and the respective knife with the lower.catch
and the respective knife, an alternate movement, i.e. an engagement and dis
engagement is obtained whereby the power required by the dobby is divided
and not concentrated at one point of the working of the dobby as is the case when
the upper and lower catches engage and disengage simultaneously.
As shown in Figs. 5 & 6 the knives during their travel have a certain dead
point owing to the same moving the distance or further on than would be
necessary to ensure a correct engagement and moving of the respective catch
(cig. 6.)
Referrin the special construction of the device for the positive movement
of the lattice barrel (one sixteenth of a turn each pick) the wheel which has
sixteen teeth, is moved by a suitable medium, actuated from the loom by hevel
wheels i, ¹, rotated by a chain and the chain wheel ', in such a manner that
same will turn and move the wheel one tooth each pick. In the present instance
the said medium is a tooth pawl mounted upon the boss of the wheel which
after and before each movement takes up the position shown in Fig. 4, the position
of the wheel beint always such that a fine drawn through the centres of the pawl
shaft and the lattice barrel or wheel shaft will pass through the middle of a tooth
of the wheel h. After each turn the wheel is momentarily locked in position in
the present instance by means of a roller m carried by a lever n placed under the
influence of a spring o secured to the frame of the dobby, which roller engages
between the teeth of the wheel h, Fig. 4. When the said wheel moves it raises
the roller m out of gear and the tension of the spring o will then cause the same
and left so as to provide room for the chain.
The shaft carrying the wheels i&is mounted in a bracket q secured to the
foot of the dobby. This bracket is 'rendered adjustable in three directions in
such manner that the respective wheels and lattice barrel motion may be brought
into proper gear. The chain wheel may be also adjusted on the shaft right
and left so as to provide room for the chain.
It will be evident that as already explained and will be easily seen from the

page_text: arrangement of the various parts, the lattice barrel may be moved in accordance
with the direction in which the loom moves, i.e. forwards as well as backwards,
the profile of the contact or cam surfaces of the weighted levers and the described
construction of the lattice barrel motion being such, that when moving backwards
all parts of the latter will work exactly as correctly as when moving forwards.
In looms which are driven from the left, the chain will be crossed and in looms
driven from the right it will be employed open, so that pegged lattice can be used
in left as well as right hand looms without having to alter same.
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
1st. In a dobby with double lift wherein the lattice barrel is moved forwards
and backwards at each pick respectively in accordance with the movement of the
loom, the employment of tannet levers retained in their highest position during
each two successive partial turns at the lattice barrel, so that although the lattice
barrel turns at every pick the lattice changes only every two picks or partial turns
of the barrel, all substantially as set forth.
2nd. In a dobby constructed as specified in claim 1, the employment of tappet
levers in such a manner that the contact surfaces of each two adjacent levers
working in unison with each other, at a partial turn of the lattice barrel are
displaced in distance equal to the travel of the lattice peg so that the top and
bottom knife catches do not engage or disengage simultaneously but separately
in two successive turns of the lattice barrel, all substantially as set forth.
3rd. The combination with the lattice barrel provided with a sixteen tooth gear,
of a single tooth gear adapted to be driven from a moving element of a loom to
impart to said single tooth gear a complete revolution at each forward and
backward movement of the loom, substantially as and for the purpose set forth.
4th. The combination with the lattice barrel provided with a sixteen tooth
gear, of a single tooth gear adapted to be driven from a moving element of a loom
to impart to said single tooth gear a complete revolution at each forward and
backward movement of the loom, and a brake adapted to positively lock the
aforesaid sixteen tooth gear. against accidental rotation after each partial rotation
thereof, substantially as and for the purpose set forth.
5th. The combination with the lattice barrel provided with a sixteen tooth
gear, of a single tooth gear adapted to be driven from a moving element of a loom"
to impart to said single tooth gear a complete revolution at each forward and
backward movement of the loom, and a brake roller held yieldingly in engage-
ment with the teeth of the aforesaid sixteen tooth gear, substantially as and for
the purpose set forth.
6th. The combination with an upper and lower knife, mechanism adapted to
impart to said knives a reciprocal to and fro motion, jacks, and upper and lower
sets of catches connected with said jacks; of a single step by step revoluble lattice
barrel and lattice, tappet levers operate. by the lattice pegs and adapted to move
both upper and lower catches into and out of the plane of motion of the knives,
the tappet levers that actuate the upper catches having their contact or cam
surfaces acted upon by the lattice pegs, out of line with the like surfaces of the
levers that actuate the lower sets of catches, substantially as and for the purpose
set forth.
7th. The combination with an upper and lower knife, mechanism adapted to
impart to said knives a reciprocal to and fro motion, jacks and upper and lower
sets of catches connected with said jacks; of a single step by step revoluble
lattice barrel and lattice, táppet levers operated by the lattice pegs and adapted
to move both upper and lower catches into and out of the plane of motion of the
knives, said tappet levers having contact or cam surfaces acted upon by the lattice
pegs of such a configuration that the shed is formed in reverse order when the

page_text: lattice barrel is moved backwards, and mechanism adapted to be driven from a
moving element of a loom to impart a step by step rotation to said lattice barrel
in one or the other direction, substantially as and for the purpose set forth.
Dated this 28th day of May 1807
F. BOSSHARDT & CO.
4, Corporation Street, Manchester, Agents to Applicant.