Improvements in and connected with Loom Dobbies and Jack Levers.
Year: 1897

page_text: Improvements in and connected with Loom Dobbies and Jack Levers.
I, ROBERT HENRY PLACE, of Sandy Gate, Burnley, in the County of Lancaster,
Loom Dobby Maker, do hereby declare the nature of this invention to be as
follows:-
This invention relates to a new means or method of hinging or connecting baulks
and links to jack levers and also the knives of dobbies in looms for weaving.
According to my invention I form the central part of the jack lever with a semi-
circular V groove and a corresponding wedge shaped projection is made on the
baulk for entering into and fitting the V groove in the jack. A semicircular
V groove is also formed in the jack lever for receiving one end of the link which is
also wedge shaped and made to fit. By making the parts with V grooves lubri-
cant can be supplied to them to enable the joints to work freely.
The grooves also prevent lateral or sideway movement of the parts, conse-
quently they work perfectly parallel and there are no projecting parts to catch
against the adjoining baulks and jack levers which is a fault with those at present
in use.
My invention also relates to the draw bars or knives employed to operate the
catches of dobbies according to which the knives are connected to cast iron bushes
or bearings, the stud for carrying same being secured by a lock nut.
By this means I secure a cast bearing to the knife end instead of wrought iron
to cast iron as hitherto, by which means the parts are more durable.
TASKER & CROSSLEY,
Halifax, Patent Agents.
Improvements in and connected with Loom Dobbies and Jack Levers.
I, ROBERT HENRY PLACE, of Sandy Gate, Burnley, in the County of Lancaster,
Loom Dobby Maker, 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 the means or method of hinging or connecting baulks
and links to jack levers, and also the knives of dobbies in looms for weaving.
According to my invention I form the central part a of the jack lever (see accom-
panying drawings Fig. 1) with a semicircular V groove see Fig. 2 and a cor-
responding wedge shaped projection is made on the baulk B for entering into and
017

page_text: fitting the V groove in the jack lever. A semicircular V groove is also formed
in the jack lever A, for receiving one end of the link C which is also wedge shaped
and made to fit. By making the parts with V grooves, lubricant can be supplied
to them to enable the joints to work freely the said lubricant entering into the
wells or cavities c of which several forms are shewn in Fig. 2. The V grooves also
prevent lateral or sidewise movement of the parts, consequently they work per-
fectly parallel and there are no projecting parts to catch against the adjoining
baulks and jack levers which is a fault with those at present in use especially with
those working upon studs, because by constant use the studs become reduced in
diameter, whilst the opening in which the studs partially rotate become larger,
consequently the levers get a lateral or sidewise movement, that is, they get out of
a true line and when this happens the adjoining levers are damaged or broken in
their next upward or downward motion. By lubricating the joints the dobby will
take less power to drive and therefore be a saving to the manufacturer.
The second part of my invention relates to the draw bars or knives employed
to operate the catches of dobbies and this is fully illustrated in Fig. 1 of the
accompanying drawings.
According to my invention the knives D are connected to a cast iron bush E
into which is screwed the ordinary stud F and additionally made secure by lock
nut G. By this means I secure a cast iron bearing to the knife end, instead of
wrought iron, by means of which the parts are more durable.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:.
Firstly. In dobbies employed in looms, the formation of V joints in the baulk
and links of levers employed therein, in combination with a well or cavity c for
containing lubricant whereby the parts are freely lubricated.
Secondly. Connecting the knife D to a cast iron bush E (in contradistinction
to wrought iron) in dobbies of looms.
Dated this 29th day of November 1897.
TASKER & CROSSLEY,
Halifax, Patent Agents.