Improvements in Shedding Mechanism of Looms for Weaving.
Year: 1897

page_text: Date of Application, 24th Nov., 1897
4000 Lonnnend
1nt Ont
1900
PROVISIONAL SPECIFICATION.
Improvements in Shedding Mechanism of Looms for Weaving.
We, CHARLES HUDSON, of 3. Craven Street, Coventry, in the County of
Warwick, Weaving Overlooker, and FRANK LEEMING, of 15, Farcliffe Terrace,
Bradford, in the County of York, Machine Maker, do hereby declare the nature
of this invention to be as follows:-
-
It relates to improvements in shedding mechanism of looms for weaving, the
object being to convert an ordinary baulk dobby into a close shed dobby.
To effect this I couple to each of the ordinary baulk dobby shedding levers
a vertical rod, which at its upper end is coupled to a horizontal bar. The outer
end of this horizontal bar is coupled to a vertical shedding lever pivotted at its
upper end and to which the healls are coupled, instead of to the ordinary baulk
dobby shedding levers before mentioned.
The opposite end of this horizontal bar is fitted with a stud and bowl which
rests in a curved slot formed in a plate which is oscillated as hereafter explained.
The radius of the curved slot is taken from the point of connection of the bar
to the vertical shedding lever. The curved slots are formed in the bars of a
grid, which said grid is coupled to the three leg of the dobby and is oscillated
at each motion of the same. The point of oscillation of the grid is at the centre
of the curved slot, or at a point intersected by a horizontal line taken from the
centre of the vertical shedding lever.
At each motion of the three leg. the grid is oscillated on its centre. The effect
of this is that the shedding levers are operated to bring all the threads of the
warp to the centre, and back again into their former positions, unless otherwise
determined by the pattern mechanism.
The pattern mechanism indicates the draw catches in the usual way, and the
bars between the said grid and the vertical shedding levers are thus operated,
whereby the threads pass from the top to the bottom of the shed, and vice versa.
Dated this 23rd day of November 1897.
Improvements in Shedding Mechanism of Looms for Weaving.
We, CHARLES HUDSON, of 33, Craven Street, Coventry, in the County of
Warwick, Weaving Overlooker. and FRANK LEEMING, of 15, Farcliffe Terrace,
Bradford, in the County of York, Machine Maker, do hereby declare the nature
Price 8d11

page_text: 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 improvements in shedding mechanism of looms for
weaving, the object being to convert an ordinary baulk dobby into a close shed
dobby.
To effect this we couple to each of the ordinary baulk dobby shedding levers
a vertical rod which at its upper end is coupled to a horizontal bar. The outer
end of this horizontal bar is coupled to a vertical shedding lever pivoted at its
upper end, to which the healds are coupled instead of to the ordinary baulk
dobby shedding levers before mentioned.
The opposite end of this horizontal bar is fitted with a stud and bowl which
rests in a curved slot formed in a plate which is oscillated as hereinafter explained.
The radius of the curved slot is taken from the point of connection of the bar
to the vertical shedding lever. The curved slots are formed in the bars of a
grid, which said grid is coupled to the three leg of the dobby and is oscillated
at each motion of the same. The point of oscillation of the grid is at the centre
of the curved slot or at a point intersected by a horizontal line taken from the
point of connection of the horizontal bar with the vertical shedding lever.
At each motion of the three leg the grid is oscillated on its centre. The effect
of this is that the shedding levers are operated whereby the threads of the warp
pass from the top to the bottom of the shed and rice versa, unless otherwise
determined by the pattern mechanism. The pattern mechanism indicates the
draw catches in the usual way, and the bars between the said grid and the
vertical shedding levers are thus operated, whereby the threads of the warp pass
to the centre and back again into their former positions.
Such being the nature and object of our said invention, the following is a com-
plete description of same, reference being had to the annexed drawings, in
which:.
Fig. is a side elevation of our improved shedding mechanism shewn in con-
nection with so much of an ordinary baulk dobby as is required to explain its
action.
Fig. 2 is front view of the oscillating grid.
ว
Fig. 3 shows the application of a connecting rod and eccentric for trans-
mitting motion from the crank shaft to the grid.
According to this invention we couple to each one of the ordinary baulk dobby
shedding levers 1 a vertical rod or bar 2 which at its upper end is coupled at X
to a horizontal bar 3. The outer end of this horizontal bar 3 is coupled to a
vertical shedding lever 4 pivoted at or near its upper end to a cross rod or
shaft 5 of the dobby. Instead of coupling the healds to the ordinary baulk
dobby shedding levers 1 as heretofore, the healds
cords 6 to the lower end of the lever 4, such cords or wires 6 passing over guide
are coupled by wires or
pullies 7.
The inner end of each horizontal bar on which is cast a stud carrying a
bowl or runner 8 which works in a curved slot 9 formed in a plate or grid 10
which is oscillated as hereinafter explained. The radius of the curved slot 9
is taken from the point of connection of the bar 3 to the vertical shedding lever 4.
... about the point 11. The curved slots 9 are formed in the bars of a grid 10
(see detail, Fig. 2) which grid 10 is coupled to the three leg or rocking lever 12
of the dobby by connecting rod 18, and is oscillated at each motion of the same.
The point of oscillation of the grid 10 is at the centre 14 of the curved slot 9 or
at a point intersected by a horizontal line taken from the point of connection
of the vertical shedding lever 4 and bar 3. ie., at the points 11 and 14, the
grid 10 being formed with bearings or collars 133 by which it is supported and
on which it rocks.
At each motion of the three leg 12, the grid 10 is oscillated on its centre 14
and the effect of this is that if the pattern mechanism allows the baulk dobby

page_text: shedding levers 1 to remain stationary at their highest or lowest position, then
the oscillation of the grid 10 will move the horizontal bar 3 backwards and
forwards from A to B or from C to D); or B to A or from 1 to C, and thus give
a full or through traverse to the vertical lever 4 to which the heald shafts are
attached. The warp threads will therefore change from the top to the bottom
of the shed or vice versa. If the pattern mechanism causes the baulk shedding
levers 1 to be moved (by the action of the usual knives, catches, and baulk 17)
at the same time as the oscillation of the grid 10 from the three leg 12 takes
place, then the effect is to raise or lower the horizontal bars 3 in the curved
slots 9 of the grid 10, whilst they are being moved backwards and forwards
by the oscillation of the said grid. The bowl S uravelling from A to C or C to A,
or from B to D or 1 to B, thus giving half of the full or through traverse of the
vertical lever 4 to which the heald shafts are attached. The warp thread will
therefore be brought either from the top or bottom of the shed to the centre and
back again to their former positions.
If the connecting rod 18 be detached from the three leg 12 and fixed to the
dobby side so that the grid is held rigid at the end of its stroke either to one
side or the other, then the action of the baulk shedding levers 1 upon the hori-
zontal bars 3 forces them up or down the curved slots of the grid and gives an
open shed movement to the vertical shedding levers 4. The warp threads then
remain stationary at the top or bottom of the shed unless required to change
their positions according to the pattern in the usual manner of an open shed
dobby.
Instead of the grid 10 being oscillated by means of connecting rod 18 from
the three leg 12, it may be oscillated independently from a tappet or eccentric 19
on the crank shaft 20 of the loom without any connection to the three leg (see
Fig. 3).
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 :-
(1) The general construction, arrangement and combination of parts con-
stituting the improved shedding mechanism as and for the purpose herein
described and substantially as illustrated by Fig. 1 of the accompanying
drawings.
(2) The baulk lever 1, vertical bar 2, horizontal bar 3. shedding lever 4, and
slotted grid 10, all in combination, as and for the purpose herein described and
substantially as illustrated by Fig. 1 of the accompanying drawings.
(3) In combination with a baulk dobby a grid and a shedding lever,
the latter being connected by compound rods or bars to the slotted grid and
to the baulk lever for the purpose herein described.
Dated this 22nd day of August 1898.