Improvements in Looms for Weaving Cross Bordered Fabrics.
Year: 1897

page_text: • Improvements in Looms for Weaving Cross Bordered Fabrics.
I, JAMES ANDERTON, of Grimshaw Street and Broomfield Mills, Preston, in the
County of Lancaster, Cotton Manufacturer, do hereby declare the nature of this
invention to be as follows:-
This invention of improvements connected with looms for weaving cross
bordered fabrics has for its object firstly to save wear and tear on the particular
jack or jacks which set the lattice of the dobby apparatus in motion when the
cross border is to be put in. In existing arrangements the said jacks are kept
moving up and down at every pick throughout the weaving of the cross border
whereas by my invention they are held up motionless during the said operation.
A second object of my invention is to do away with the use of string or cord for
suspending the catches or pawls which actuate the catch or ratchet wheels of the
dobby apparatus. As is well known string or cord used for this purpose is apt
to stretch in a dry atmosphere and to contract in a damp one thus sometimes
causing the catches to drop in gear with their catch wheels and so put the lattice
accidentally in motion when not required.
In carrying out my invention I employ an ordinary form of measuring motion
that is to say a train of toothed gearing with a notch or index plate and lever
mechanism whereby the particular hook and its jack for setting the lattice in
motion is brought over the knife or lifter of the dobby through the medium of a
connecting chain in the usual way. I connect the said jack for setting the lattice
in motion to one end of a horizontally disposed centrally fulcrummed swing lever
from whose other end rises a vertical connecting rod jointed at its upper end to a
horizontally disposed forked swing lever from the two prongs or arms of which are
suspended in the case of double lift dobbies--the two catches or pawls for actuat-
ing the two catch or ratchet wheels. Thus when the horizontal swing lever is
raised by the jack at one end its other end is correspondingly depressed or lowered
thus bringing down the forked lever and allowing the catches or pawls to engage
with their respective catch wheels and vice versa. In conjunction with the jack
for starting the lattice I arrange an L or bell. crank lever one of whose arms is
disposed horizontally and answers as a counterbalance weight whilst the other or
vertically disposed arm is so arranged or formed that when the adjoining or lattice
starting jack is lifted the upper end of the vertical arm slips or falls forward under
the said jack and retains it in its lifted or raised position until released by the
movement of another jack employed for bringing the lattice to a stand when it has
gone as ordinarily arranged once round and so put in the cross border. This
last named jack is so arranged that its upward movement raises the horizontal or
weighted arm of the bell crank lever thus causing the vertical arm to be
simultaneously removed from under the suspended or held up lattice starting jack
which thereupon drops down to its former normal position. A third jack is
employed to lift the lever of the measuring motion into its original position in the
naval wav

page_text: By means of the above described arrangement of apparatus only one side of the
lattice of a double lift dobby requires pegging for cross bordering purposes.
Dated this 7th day of January 1897.
'
Improvements in Looms for Weaving Cross Bordered Fabrics.
I, JAMES ANDERTON, of Grimshaw Street and Broomfield Mills, Preston, in the
County of Lancaster, Cotton 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:
This invention of improvements in looms for weaving cross bordered
fabrics has for its object firstly to save wear and tear on the particular
jack or jacks which set the lattice of the dobby apparatus in motion when the
cross border is to be put in. In existing arrangements the said jacks are kept
moving up and down at every pick throughout the weaving of the cross border
whereas by my invention they are held up motionless during the said operation.
A second object of my invention is to do away with the use of string or cord for
suspending the catches or pawls which actuate the catch or ratchet wheels of the
dobby apparatus. As is well known string or cord used for this purpose is apt
to stretch in a dry atmosphere and to contract in a damp one thus sometimes
causing the catches to drop in gear with their catch wheels and so put the lattice
accidentally in motion when not required.
In carrying out my invention I employ an ordinary form of measuring motion
that is to say a train of toothed gearing with a notch or index plate and lever
mechanism whereby the particular hook and its jack for setting the lattice in
motion is brought over the knife or lifter of the dobby through the medium of a
connecting chain in the usual way. I connect the said jack for setting the lattice
in motion to one end of a horizontally disposed centrally fulcrummed swing lever
from whose other end rises a vertical connecting rod jointed at its upper end to a
horizontally disposed forked swing lever from the two prongs or arms of which are
suspended in the case of double lift dobbies-the two catches or pawls for actuat-
ing the two catch or ratchet wheels. Thus when the horizontal swing lever is
raised by the jack at one end its other end is correspondingly depressed or lowered
thus bringing down the forked lever and allowing the catches or pawls to engage
with their respective catch wheels and vice versa. In conjunction with the jack
for starting the lattice I arrange an L or bell crank lever one of whose arms is
disposed horizontally and answers as a counter balance weight whilst the other or
vertically disposed arm is so arranged or formed that when the adjoining or lattice
starting jack is lifted the upper end of the vertical arm slips or falls forward under
the said jack and retains it in its lifted or raised position until released by the
movement of another jack employed for bringing the lattice to a stand when it has
gone as ordinarily arranged once round and so put in the cross border. This
last named jack is so arranged that its upward movement raises the horizontal or
weighted arm of the bell crank lever thus causing the vertical arm to be
simultaneously removed from under the suspended or held up lattice starting jack
which thereupon drops down to its former normal position. A third jack is

page_text: employed to lift the lever of the measuring motion into its original position in the
usual way.
By means of the above described arrangement of apparatus only one side of the
lattice of a double lift dobby requires pegging for cross bordering purposes.
In the accompanying drawings,
Fig. 1 is a side view and
Fig. 2 an end view of so much of a loom and dobby apparatus as is necessary to
illustrate the nature of my improvements.
Fig. 3 is a detail plan view of the forked swing lever for raising and lowering
the pawls or catches hereinbefore referred to.
a is the notch or index plate of an ordinary arrangement of measuring motion of
which is the change wheel, c a chain wheel driven from another chain wheel d
on the emery roller shaft e. f is a hook lever fastened to the ordinary pivoted lever
9 to whose outer or free end is connected a wire rod h connected at its upper end
to the two chains i and j the chain i being connected to an ordinary form of wire
book k the latter being pulled over as required on the ordinary lifter or knife and
lifting or raising the jack / when the lattice has to be set in motion. The chain j
is connected at its upper end to the jack / so that the catch f may be lifted out of
the notch in the index wheel a when the jack is lifted on to the catch r.
m is the
centrally fulcrummed swing lever to one end of which is attached by a chain n
the jack the other end of the lever m carrying the vertical rod o jointed at its
upper end to the forked swing lever p pivoted at p. 99 are the ordinary catch
wheels and q q¹ the ordinary pawls or catches. 12 represents a chain attached to
the pivoted lever p at its upper end and at its lower end to the pawls or catches q¹ q¹
(shewn at Fig. 3). r is the bell crank lever having the upper extremity of its
vertically disposed arm notched at rl so that when it falls forward under the jack Z
the said jack is held or retained in its raised position until released by the movement
of a second jack 11 arranged to bring the lattice to a standstill when the cross
border has been put in. The cross piece 2 consists of an angle bracket fastened to
the jack and serves to prevent the said jack 1 from dropping too far and too
quickly and so to obviate breakage or damage. The second jack is connected to
the bell crank lever by a chain s. is a weighted handle whereby the catches q¹ q¹
may be raised out of gear or disengaged from their catch wheels in order to allow
of the lattices being turned back when the weft breaks.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:―
The arrangement of parts in conjunction with dobby mechanism constituting the
improved apparatus to be employed in putting in cross borders in looms for weaving
substantially as herein described and shewn in the drawings for the purpose or
purposes set forth.