IMPROVEMENTS IN DOBBIES USED IN LOOMS
Year: 1884

page_text: دو
I, JAMES GRECSON of the firm of Gregson and Monk of Vulcan Iron Works,
Preston in the county of Lancaster, Machinist and Loom Maker, do hereby declare
the nature of my invention for "IMPROVEMENTS IN DOBBIES USED IN LOOMS"
and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement:-
This Invention of Improvements in dobbies used in Looms relates to that part
of the Loom known as the Dobby and the improvements are designed to simplify
its construction which will cause it to work better, more steadily and accurately,
and will therefore require less power in driving; and will weave both light and
heavy goods.
Now according to my invention I make a Dobby which can be made to work
as a single or double lift dobby. I first dispence with the lifting levers, knives and
streamers which pass through the yarn to the treadles, also the treadles, and the top
shaft and swing pullies for connecting the knives, also lifting wires, which are
liable to bend and wear off at the book; and I substitute in the place of these
underneath the dobby what I term a cradle which oscillates and by this means
I have flat metal lifting hooks which works direct upon the Jack and lifts the
healds. I also do away with all spur or bevel wheels which are generally used
for the movements of either fixed or sliding card barrels, in my improvements the
card barrel is fixed or stationery, and wherever there is a peg on the pattern card
or lattice, it puts the flat lifting books direct on to the Jack. I also substitute a
dead weight which works on the top of the knotched wheel, in place of the present
arrangement of flat springs which are used for locking the knotched wheel of the
card barrel, or spiral springs and cast brackets which are also used for the same
purpose; and by this means there is nothing that can get out of order, and keeps
the card barrel safely locked.
.
I also dispence with the teeth in the Jack levers which are liable to break, and
substitute in their place a joint as shown on the drawing, the Jacks can be made to
slide upon a shaft, or with open slot which will enable them to be hooked on or
taken off the shaft more readily, I also employ a new arrangement of levers &c
for working the machine and turning the card barrel. This dobby can also be
made to answer from a straight lift to an inclined lift dobby by a slight alteration
in the cradle or flat hooks.

page_text: In the
In order that my Invention may be fully understood and readily carried into
operation, we will proceed to describe the accompanying Drawings.
different views similar parts are marked with corresponding letters of reference.
Fig 1 is a front view of the dobby fit up complete as a double lift dobby and is
worked by an eccentric on the tappet shaft either inside or outside the loom;
when the dobby is wanted to work as a single lift dobby, this is readily done by
disconnecting the flat hook C. Figs 1. & 3. from either side and then work.the
dobby by an eccentric from the crank shaft fixed either inside or outside the
loom. A. Figs 1. 4. & 5. shows the Jacks with the joint which dispences with
the teeth. Fig. 5 shows open slot Jacks at B which will enable the Jacks to be
hooked on the shaft marked S. or taken off more readily, and the parts on the Jack
marked J are the parts acted upon by K of the flat hook C Fig 3, which by the
oscillation of the cradle D pulls down the flat hook C on to the point J on the
joint of the Jacks marked A and therefore lifts up the end of the Jacks marked L
which opens the sheds of the warp. D. Figs 1 & 8 is the cradle or rocking beam
which is oscillated by the lever I working on the end of the centre shaft N. 1.
which is worked by the lever M. connected by a rod to an eccentric on the tappet
or crank shaft. N are two small shafts which goes through the cradle or rocking
shaft that the flat hook C works upon, and by the cradle oscillating brings down
the flat hook C on one side and lifts up the flat hook C on the other side and vice
versa; as the flat hooks are being brought down by the oscillation of the cradle,
the head of the flat hooks marked P is acted upon by the wood pegs in the lattice
card marked R which throws the hook K Fig. 3. on to the point J figs 4. & 5.
which presses joint A down and raises the ends of the Jacks which opens the
shed as above described; the balance weight at the end of the flat hook C and
marked C 1. takes the flat book back in its proper position when worked from the
cradle underneath the dobby. The cradle can also be fixed and worked on the top
of the dobby above the pattern card if required as shown by the dotted lines Fig. 2;
and to alter the dobby from a straight lift to an inclined lift, the same can be done
by two methods, one way is by having different lengths of the flat hooks C, which
will cause a variation in the lift of the Jacks, the other way is by raising up the
front end of the centre shaft N. 1. a little out of its horizontal position which will
cause a gradual variation in the length of all the flat hooks C, coming in contact
with the joint of the jacks marked A. Letter E figs 1 & 6. are the dead weights
which sits upon the top of the knotched wheels W and which are kept in their
vertical positions by sliding up and down the arms marked T. which carries the
shaft marked V. and letter E 1. shows the back of the dead weight with the slides
on each side which clips the arms T which carries the shafts V, Fig. 7. which are
the shafts which carries the knotched wheel W for working and locking the card
barrel. Wheels marked Z Fig 1. are hand wheels for the means of turning the card
barrel backwards and forwards when desired.
Fig. 2. shows the back of the dobby. I is a straight lever which fastens on the
centre shaft N. 1. of the cradle or rocking beam. G are two L levers which
oscillates on to the ends of the shafts marked V and are connected to the lever I
by two connecting rods marked H. F. are two catches working on the end of the
lever marked G which come in contact with the ratchet wheels marked X which
works on the end of the shaft marked V. which turns the card barrel, and by each
oscillation of the beam I, the catch F moves the ratchet wheel X one tooth, which
turns the card barrel with the pattern or lattice card containing the lattice pegs in
time to come in contact with the flat hook C at P for pressing and which throws K
upon Jas previously described, and by simply lifting the catch F out of gear, the
pattern cards can be turned backwards or forwards for re-setting or adjusting the
fattices to suit the pattern in case of lost or broken picks or when floats or bad
places have been made in the cloth, and the lattices require re-adjusting.
M is a lever with a curved slot at one end wliich works upon a stud or slide
upon lever I which gives the movement to the dobby, and on the other end
0

page_text: a swivel which couples the connecting rod that works to the eccentric on the crank
or tappet shafts.
In conclusion I may observe that I do not confine myself to the precise
details I have had occasion to describe or. refere to, as many variations may
be made therefrom without deviating from the principles or main features of my
Invention.
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
1. The construction of the Dobby which can be used as a double or single
lift dobby.
2. The use or employment of a cradle or rocking beam fixed underneath or on
the top side of the Dobby above the lattice cards, which oscillates and by that
means lifts or presses flat hooks up and down betwixt the Jacks.
3. The construction of Jacks without teeth and Jacks with slots to hook upon
the shafts.
4. The dead lock weight which dispenses with all flat or spiral springs used for
locking.
5. The size of the levers M. I. H & G for working the cradle and card barrel
notion.
6. F. the catch used for working or stopping the card barrel.
7. The means employed for making the dobby straight or inclined lift.
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