An Improvement in Shut Shed Dobby Mechanism of Looms for Weaving.
Year: 1895

page_text: Date of Application, 24th Aug., 1895
Complete Specification Left, 16th May, 1896-Accepted, 11th July, 1896
PROVISIONAL SPECIFICATION.
An Improvement in Shut Shed Dobby Mechanism of Looms for
Weaving.
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:-
This invention relates to shut shed dobby mechanism of looms for weaving, aud
consists of an improvement in the mechanism described by us in the third part of
our Specification of Letters Patent, No. 1557, A.D., 1894.
In the specification above referred to, there is employed a roller, having a
to-and-fro motion, which operates on inclined arms of the bell crank levers of the
dobby, whereby the said levers, and parts connected therewith, are, after each
operation of the draw knives, brought into a normal position: that is, the same
position as they occupied before the operation of the knives. By such means the
catches are prepared ready for the operation of the pattern lags. The bell crank
levers are formed with inclined arms, forming an <, within which the said roller
works. When the roller is moving backwards, to bring the bell crank levers into
a normal position, it is in contact with a certain number of the upper, and a certain
number of the lower of the inclined arms; consequently, instead of revolving, it
remains stationary. This creates increased friction to such an extent that the
roller quickly wears away..
In order to overcome this defect, we have devised means whereby we employ two
rollers, one for the upper line, and one for the lower line of inclined arms. To
effect our purpose we employ, in place of the reciprocating roller, a shaft mounted
between the inclined arms of the bell crank levers, on which shaft we fix two bell
crank levers, one at each end, carrying between their extremities two rollers, one
for the upper row of inclined arms, and one for the lower row. The shaft carrying
the roller levers is coupled, by a rod and lever, to some convenient reciprocating
part of the dobby mechanism, so that the rollers are raised and lowered at times
corresponding to the operations of the dobby knives that is, when the knives are
drawn for operating the bell crank levers, the rollers are moved out of contact with
the inclined arms, but, immediately the knives recede, the rollers are operated to
place the bell crank levers in their normal position.
The inclined arms being thus operated by separate rollers, each of such rollers
is caused to rotate by the friction against its line of inclined arms, and consequently
both the friction and wear are reduced.
Dated this 21st day of August 1895.
J. SIDNEY CRITCHLEY,
27 Kirkgate, Bradford, Agent for the Applicants.

page_text: COMPLETE SPECIFICATION.
An Improvement in Shut Shed Dobby Mechanism of Looms for
Weaving.
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 ascertained in and by the following
statement :-
This invention relates to shut shed dobby mechanism of looms for weaving, and
consists of an improvement in the mechanism described by us in the third part of
our Specification of Letters Patent No. 1557, A.D. 1894.
In the specification above referred to, there is employed a roller having a
to-and-fro motion, which operates on inclined arms of the bell crank levers of the
dobby, whereby the said levers and parts connected there with are, after each
operation of the draw knives, brought into a normal position; that is, the same
position they occupied before the operation of the knives. By such means the
catches are prepared ready for the operation of the pattern lags. The bell crank
levers are formed with inclined arms, forming a <within which the said roller
works. When the roller is moving backwards, to bring the bell crank levers into
a normal position, it is in contact with a certain number of the upper, and a certain
number of the lower of the inclined arms; consequently, instead of revolving, it
remains stationary. This creates increased friction to such an extent that the roller
quickly wears away.
In order to overcome this defect, we have devised means whereby we employ
two rollers, one for the upper line, and one for the lower line of inclined arms.
To effect our purpose we employ, in place of the reciprocating roller, a shaft
mounted between the inclined arms of the bell crank levers; on which shaft we fix
two bell crank levers, one at each end, carrying between their extremities, two
rollers, one for the upper row of inclined arms, and one for the lower row. The
shaft carrying the roller levers is coupled by a rod and lever to some convenient
reciprocating part of the dobby mechanism, so that the rollers are raised and
lowered at times corresponding to the operations of the dobby knives; that is,
when the knives are drawn for operating the bell crank levers, the rollers are
moved out of contact with the inclined arms, but immediately the knives recede,
the rollers are operated to place the bell crank levers in their normal position.
The inclined arms being thus operated by separate rollers, each of such rollers
is caused to rotate, by the friction against its line of inclined arms, and consequently
both the friction and wear are reduced.
In order to more fully explain our invention, we append hereto a sheet of
drawings marked with figures and letters of reference :--
Figure 1 of such drawings shows a sectional view of such parts of the loom dobby
mechanism as are necessary to explain our invention, and Figure 2 is a plan view
of same. 28 denotes the draw knives coupled to the double armed pivoted lever 29,
which is oscillated by a wheel driven from one of the looms' main motor shafts in
the usual manner. 26 are the draw catches, coupled to the bell crauk levers 27,
which are pivotted on a pin 32, and elongated to form a double incline 33, as
described in the specification above referred to.
A, denotes the shaft carrying two bell crank levers B. B, between which are
mounted rollers C. C, the former operating on the upper row of inclined arms, and
the latter on the lower row of arnis of the levers 27. The shaft A is coupled to
the pivotted lever 29 by means of a red D and lever E, whereby the rollers C
and C', are operated in conjunction with the knives 28; that is, when the knives
are drawn for operating the bell crank levers 27, the rollers are raised out of

page_text: contact with the inclined arms, as shown in Figure 1. When however the knives
move in the opposite direction, the rollers are operated to place the bell crank levers
in a normal position.
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 :-
In shut shed dobby mechanism of looms for weaving the employment of a shaft A,
carrying levers B. B, between which are mounted rollers C. and C, and arranged
to operate on extended portions of bell crank levers 27, for the purpose of bringing
the said levers (27) and other parts connected therewith into a normal position.
after each operation of the knives 28, substantially as shown and described.
Dated this 11th day of May 1896.
J. SIDNEY CRITCHLEY,
9 Charles Street, Bradford, Agent for the Applicants.