IMPROVEMENTS IN " DOBBIES OR " JACQUARDS EMPLOYED IN LOOMS FOR WEAVING AND IN APPARATUS CONNECTED THEREWITH
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by John Garstang, Alice Harling, and
Alice Harling at the Office of the Commissioners of Patents on the 12th June
1883.
JOHN GARSTANG of Burnley in the county of Lancaster, Overlooker and ALICE
HARLING of 72 Manchester Road Burnley and ALICE HARLING of Highfield
Terrace Burnley aforesaid, Machine Makers "IMPROVEMENTS IN " DOBBIES OR
"
JACQUARDS EMPLOYED IN LOOMS FOR WEAVING AND IN APPARATUS CONNECTED
THEREWITH,"
"
The object of the first part of our invention is to simplify the construction of
dobbies" and make them more certain of action, whereby friction and wear and
tear of the parts is reduced.
For this purpose we employ a series of horizontal levers connected in the centres
thereof to the ordinary jack levers by means of vertical links.
These links are not rivetted to either of the levers but fit onto button headed
studs formed on the side of each lever; double sized eyelets being formed in each
end of the links so that they can easily be put on and removed when necessary.
On each end of the horizontal levers is placed a vertical hook (having double
sized eyelets for fitting onto button headed studs formed on the said horizontal
levers) raised and lowered by the usual lifting knives when not pulled off by the
peg-lag apparatus
The upper ends of these vertical hooks are connected together by a steel spring
so that when any of the said hooks are pushed off one lifting knife the corre-
sponding hook on the opposite side is pushed onto the other lifting knife the said
spring always insuring when one hook is pushed off, that the opposite one shall be
pushed on if required
In order that the exact level and position of each of the horizontal levers may
be determined each time they are lifted, the undersides thereof are hollowed out
for fitting onto a stationary bar at each side of the dobby. By these combined
means the healds which are attached to the jack levers, are lifted with great
regularity the various motions being simple and positive.
The second part of our invention has reference to apparatus to be employed for
pulling the healds down so as to close the warp, after having been opened by the
mechanism described in the first part of this specification

page_text: The apparatus we employ for this purpose consists of a series of segmented levers,
hinged to a rail fixed underneath the loom.
The bottom shaft of each heald is connected to one of the segments by a cord or
strap, and a spiral spring is also connected to the segment for pulling the healds
down after being lifted by the apparatus previously mentioned.
The spiral spring is attached to the segment in such a position as regards its
working centre, that the pressure is less when the spring has been opened and the
healds raised for opening the warp, whereby tension and friction upon the healds
and warp is diminished, consequently there is less wear and tear and fewer
breakages, and the power required to operate the healds is reduced.
The third part of our invention consists in stopping the progress of the dobby or
jacquard as soon as the weft breaks, and this is accomplished by means of an
arrangement of levers and bell cranks, caused to act upon catches of the dobby or
jacquard.