An Improvement in Dobbies for Weaving Gauze or Leno Fabrics.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
An Improvement in Dobbies for Weaving Gauze or Leno Fabrics.
We, RICHARD LONGDEN HATTERSLEY, of North Brook Works, Keighley, in the
County of York, Machine Maker, and SIMEON JACKSON, of the same address,
Manager, do hereby declare the nature of this invention to be as follows:-
Our improvement relates to the shedding or dobby mechanism for the manu-
facture of gauze or leno fabrics, and consists of a simple arrangement attached
to an open shed dobby, by which the said dobby imparts all the necessary
movements to the healds without making use of the additional motion, that has
hitherto been necessary.
It is understood that in this class of fabrics the warp threads, or a portion of
such threads, do not lie parallel to each other in the cloth, but are, in the process
of weaving, either twisted together or otherwise crossed over from one side to the
other, and that when the crossing takes place, the crossed, commonly called
standard, ends should be about their central position, that is, should be raised to
the centre for the crossing ends to cross them. In order to attain this object, we
make use of the following arrangement:-
On the rocking shaft of the dobby, we mount rigidly a tappet, which operates
and works in connection with, by means of lever and rod, or other suitable
mechanism, a bell crank lever of the dobby. The before-mentioned tappet is
designed in such a manner that, when the rocking shaft is at either one or the
other of its extremities, it is in its lowest position, and when midway between,
in its highest position, and thus the necessary motion is imparted to the bell crank
lever to which is connected the heald carrying the crossed ends. In case two or
more healds are employed for the crossed ends, a corresponding number of bell
crank levers may be operated in the manner before described.
RICHD. L. HATTERSLEY,
SIMEON JACKSON,
Applicants.
An Improvement in Dobbies for Weaving Gauze or Leno Fabrics.
We, RICHARD LONGDEN HATTERSLEY, of North Brook Works, Keighley, in the
County of York, Machine Maker, and SIMEON JACKSON, 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:-
Our improvement relates to the shedding or dobby mechanism for the manu-
facture of gauze or leno fabrics, and consists of a simple arrangement attached

page_text: to an open shed dobby, by which the said dobby imparts all the necessary
movements to the healds without making use of the additional motion that has
hitherto been necessary.
It is understood that in this class of fabrics the warp threads, or a portion of
such threads, do not lie parallel to each other in the cloth, but are, in the process
of weaving, either twisted together or otherwise crossed over from one side to the
other, and that when the crossing takes place, the crossed, commonly called
standard, ends should be about their central position, that is, should be raised to
the centre for the crossing ends to cross them. In order to attain this object, we
make use of the following arrangement:-
On the rocking-shaft of the dobby, we mount rigidly a tappet, which operates
and works in connection with, by means of lever and rod, or other suitable
mechanism, a bell crank lever of the dobby. The before-mentioned tappet is
designed in such a manner that, when the rocking-shaft is at either one or the
other of its extremities, it is in its lowest position, and when midway between,
in its highest position, and thus the necessary motion is imparted to the bell crank
lever to which is connected the heald carrying the crossed ends. In case two or
more healds are employed for the crossed ends, a corresponding number of bell
crank levers may be operated in the manner before-described.
In order to explain more clearly our invention, we append hereto a sheet of
drawings marked with figures of reference, in which like figures denote like
parts.
Fig. I shows an elevation of the dobby with our improvement attached, and
Fig. II an end view of same.
Motion is imparted to the dobby in the ordinary manner by the lever 1, which
is rigidly mounted on the shaft 2, and on the latter we mount the tappet; 3;
this tappet operates, by means of the anti-friction pulley 4, the lever 5; the
latter is fulcrumed on the stud 6, and is connected by the rod 7 with one of the
series of bell crank or heald levers 8. The before-mentioned lever 8 is also
indicated upon and operated same as the rest of the series in the well known
manner.
It will be seen from Fig. 1 that when the shaft 2 is at either one or the other
extremity of its motion, the tappet 3 does not operate on the lever 5, but that it
operates the same when the said shaft is about the centre of its motion, thus it
is clear that when the heald lever 8 is at its lowest position, that is, when it is not
raised by the ordinary motion of the dobby, it is, at each movement of the dobby
operated upon by the tappet 3 and brought to a central position. Further as the
beald carrying the crossed warp threads is connected to this lever 8, these threads
are accordingly raised to the centre to allow the crossing ends to cross them.
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:-
The manner of operating one heald lever, or more, by means of connection
between the shaft and the heald lever in the manner described and for the
purpose specified.
Dated this 8th day of January 1898
RICHD. L. HATTERSLEY,
SIMEON JACKSON,
Applicants.