IMPROVEMENTS IN LOOM DOBBIES
Year: 1885

page_text: از
I WILLIAM WILLIAMSON of The Windsor Mills Lissade! Street, Pendleton near
Manchester in the County of Lancaster Manager do hereby declare the nature of
the said Invention for "IMPROVEMENTS IN LOOM DOBBIES" to be as follows:-
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My said Invention relates to the "dobbies which are used in conjunction with
looms for weaving textile fabrics, and consists in improvements whereby the
construction of such dobbies is simplified, their working rendered more certain and
efficient and their cost reduced. In a certain well known type of dobby now in
common use, the hooks which actuate the jack levers are arranged horizontally and
are caused to engage with or remain clear of the sliding knives by means of
needles and other intermediate tackle which are operated from a pegged barrel or
chain of cards. The object of my invention is to dispense with the said inter-
mediate arrangements and to raise and lower the sliding hooks by bringing them
into direct contact with the pegs on the barrel or barrels without the interposition
of either needles or springs. In my improved dobby the knives are reciprocated
as usual by a bell crank lever or other means. And the hooks are arranged above
the knives. The peg barrels are situated immediately beneath the knives and at
such a level that when either of the barrels in revolving brings a peg beneath any
of the hooks the said hook is lifted by the peg so as to clear the reciprocating
knife. When the peg passes round with the barrel the hook again drops so as to
engage with the knife. The inner ends of the hooks are jointed to a lever pivoted
at or about their centres to arms on the jack levers so that as the upper or lower
ends of the book levers are advanced by the pull of the knives or retracted by
the pull of the heald springs acting through the jack levers, the healds are
correspondingly raised and lowered.
Dated this 19th day of September 1885.

page_text: I WILLIAM WILLIAMSON of Windsor Mills, Lissadale Street, Pendleton near
Manchester in the County of Lancaster Manager do hereby declare the nature of
the said Invention for "IMPROVEMENTS IN LOOM DOBBIES" and in what manner
the same is to be performed to be particularly described and ascertained in and by
the following statement and accompanying drawings :—
My said Invention relates to the dobbies which are used in conjunction with
looms for weaving textile fabrics and consists in improvements whereby the
construction of such dobbies is simplified, their working rendered more certain and
efficient and their cost reduced. In a certain well known type of Dobby now in
common use, the hooks which actuate the jack levers are arranged horizontally
and are caused to engage with or remain clear of the sliding knives by means of
needles and other intermediate tackle which are operated from a pegged barrel or
chain of cards. The object of my invention is to dispense with the said inter-
mediate arrangements and to raise and lower the sliding hooks by bringing them
into direct contact with the pegs on the barrel or barrels without the interposition
of either needles or springs.
My Invention will be most clearly understood when described with reference to
the accompanying drawings in which Fig. 1 represents a Side Elevation, Fig. 2
a Longitudinal Sectional Elevation and Fig. 3 a Plan View of a dobby constructed
in accordance with my Invention. In the said Figs. a. a. are two pattern chain
barrels, b. b. are the knives, c. c¹ are the hooks or griffs and d. d. are the jacks or
levers from which the healds are suspended as is usual. The two chain barrels
receive motion from a vertical shaft d³ which connected by bevel gearing e. with
a shaft f. which is mounted in a bracket which is attached to the framing of the
dobby. Upon the outer end of this shaft is secured a chain wheel g. which is
connected by means of a pitch chain with a chain wheel which is fixed upon the
tappet shaft or the crank shaft of the loom as preferred the said wheel being made
of a size suitable to the shaft upon which it is fixed. Upon the shaft d' are fixed
two bevel wheels h. h. each of which is formed with two teeth only as indicated to
a larger scale in Fig. 4 which is a plan view of this part of the gearing. The
wheel imparts an intermittent motion to a wheel . which is fixed upon the
chain barrel shaft. In the example the wheel i. is formed with say eight recesses
with which the teeth upon the wheel h. alternately engage so that the wheel i. is
caused to make one-eighth of a revolution twice during one revolution of the
wheel hand to remain at rest for short intervals of time between such movements
as in the cases of similar parts already in use in loom apparatus. It will be seen
that the wheels h. h are fixed in such positions upon their shaft as to act alternately
whereby the two chain barrels are caused to move alternately. The pattern
chains k. k. which are carried by the chain barrels are in the example of an
ordinary description and consist of bars furnished with projecting pegs and linked
together the pegs being disposed according to the pattern which the loom is
required to produce as is well understood. At each movement of either chain
barrel a fresh bar in the chain is brought below the row of griffs c. and wherever
a peg is thereby brought below any one of the said griffs such griff is raised as
indicated in the lower part of Fig. 2 the griffs not meeting with pegs remaining
down as indicated in the upper part of the same Fig. The two knives b. b. slide
in slots in the framing and are connected with the arms of two levers L. l. which

page_text: are fixed upon the ends of a rocking shaft m which is mounted in bearings in the
framing the arrangement being such as that when the said shaft is caused to rock
to and fro in its bearings the two knives are moved to and fro one knife moving
at all times in a direction contrary to that of the other knife. One of the levers l.
is formed with a third arm which projects at right angles or thereabouts from
the other arms and is connected by means of a link or rod n with a crank or
excentric upon the tappet shaft or it might be with a bottom lever receiving
motion from such shaft whereby the shaft m is caused to rock in its bearings and
the two knives are caused to move to and fro. The action of the parts is as
follows. During the working of the loom the knives are caused to slide to and
fro in their bearings each knife making a double movement say for example from
right to left and from left back again to right in the time required by the loom to
make two picks. In the same time each of the two chain barrels makes a step
movement. All the griffs which are raised by the pegs on the pattern chain clear
the knife as it moves in the direction indicated by the arrow. Any griff which
is not so raised engages with the knife which comes in contact with the hook at
the end of the griff and the latter is drawn by the knife in the indicated direction.
The top and bottom griffs c. c¹ are coupled together in pairs by means of a lever o.
the two griffs being hinged to the two ends of the said lever. The said lever is
mounted upon a hinge pin p. which is fixed in an arm & which projects from the
jack each jack being thus connected with a pair of levers. When both griffs are
disengaged from the two knives the connected jack drops until the ends of the
lever o. bear against two fixed bars r. r the suspended heald being then at the
bottom of the shed. In Fig. 2 the top griff c. is being drawn in the direction
indicated by the arrow and. the lower end of the lever o. bearing against the fixed
bar r uses this bar as a fulcrum and the connected jack is lifted for one pick of
the loom. For the next pick the bottom barrel would make a movement and the
jack would be lowered if the other griff c¹ in the pair were raised by a peg or
the jack would be lifted if the said griff were not so raised. I do not claim the
particular arrangement of gearing for actuating the pattern chain barrels nor the
exact details of the apparatus the most important feature in my invention being
the direct raising of the hooks or griffs c. c¹ by means of pegs or projecting links
upon pattern chains or in the cases of sufficiently simple patterns by means of pegs
or projections upon a peg or pattern barrel. The curved racks 8. a. sustain a
roller t. which is used to hold up the slack of the pattern chain in cases wherein
the said chain would be so long as to extend to the lower griffs if not kept out of
the way.
In case all the griffs are not required for simple patterns those not
required can be sustained out of action by means of a rod u as indicated by the
dotted lines in the upper part of Fig. 2.
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 combination of parts forming the complete dobby arranged and acting
substantially as and for the purpose set forth and indicated hereinbefore and in
and by the accompanying drawings.
2. In a loom dobby raising the hooks or griffs c. c' directly, by means of the
pattern chain and barrel at the times when the said hooks or griffs are to clear the
reciprocating knives substantially as described and illustrated.
n
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1000
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DUTTON & FULTON,
Agents.