Improvements in Lace Machines.
Year: 1889

page_text: Date of Application, 21st Dec., 1889
Complete Specification Left, 23rd May, 1890-Accepted, 28th June, 1890
PROVISIONAL SPECIFICATION.
Improvements in Lace Machines.
We, WILLIAM WALLIS and GEORGE LONGDEN, both of the firm of Wallis and
Longden of Austins Factory, Long Eaton in the County of Derby, Lace Machine
and Jacquard Builders, do hereby declare the nature of this invention to be as:
follows:-
This invention relates to improvements in the motion of the carriages in lace
machines and to those parts which impart motion to the said carriages.
In a lace machine in which the catch bars are carried by landing bars, which are
operated by levers, secured on a single rocking shaft which is rocked by the action of
cranks on the main driving shaft, connected to main levers secured on the rocking
shaft by means of connecting rods we preferably form the end of the main levers of
the rocking shaft to receive blocks or slides which slide freely in the direction of the
length of the levers.
The blocks or slides are formed with joints to receive the ends of the connecting
rods and the working length of the levers is thus increased or diminished as the blocks
slide on the levers and the centre of the joint pin of the connecting rod recedes from
or approaches the centre of the rocking shaft.
The movement of the blocks or slides on the levers inay be regulated by a link of
suitable length with one of its ends pivoted on the connecting rod joint pin or at any
other convenient part of the blocks or slides and its other end working on a fixed
centre placed outside the curve described by the lever, so that the end which moves
with the sliding block and lever will describe a curve in the opposite direction to
that of the lever and the block or slide to which the connecting rod is attached will
approach nearer the centre of the rocking shaft at the centre of its motion and will
recede from the centre of the rocking shaft at the two extremities of its motion thus
shortening the working length of the lever in the centre of its motion and increasing
it at the extremities.
By this arrangement the motion of the carriages is further accelerated in the
centre of their motion and the said carriages have a corresponding decrease as they
approach the centre of the frame and at the extreme of their front and back motion,
a little more time is thus gained for the carriages to change from one catch bar to the
other and for the threads to take up a fresh position so that the cams on the Jacquard
not required so sharp and consequently the Jacquard has a smoother
are
motion.
In a lace machine in which each catch bar is operated by a separate rocking shaft
connected by links and levers to compound levers (which in some cases take the form
of discs) actuated by a crank through a connecting rod the connecting rod may be
pivoted to a block or slide sliding on the compound lever or disc and governed by a
link in the same manner as herein before described or by other suitable mechanical
arrangement.
Dated this 21st day of December 1889.
W. P. THOMPSON & BOULT,
Agents for the Applicants.

page_text: COMPLETE SPECIFICATION.
Improvements in Lace Machines.
We, WILLIAM WALLIS and GEORGE LONGDEN, both of the firm of Wallis &
Longden, of Austins Factory, Long Eaton, in the County of Derby, Lace Machine
and Jacquard Builders, 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 improvements in the motion of the carriages in lace
machines, and to those parts which impart motion to the said carriages.
It will be best understood by reference to the accompanying drawings in which
Fig. 1 is a vertical cross section of a Levers lace machine, parts only of which are
shown, Fig. 2 is a front elevation and Fig. 3 a cross section of a main lever showing
connections.
In carrying out this invention in a lace machine such as shown in which the catch
bars A are carried by landing bars B which are operated by levers C secured on a
rocking shaft D which is rocked by the action of cranks E on the main driving shaft
connected to main levers F secured on the rocking shaft D by means of connecting
rods G, we preferably form the main levers F to receive sliding blocks H which are
free to slide in the direction of the length of the levers.
The sliding blocks H are preferably formed cylindrical and each slides in a
corresponding shaped recess in the lever F with longitudinal openings on each side,
the connecting rods G are preferably formed with forked ends fitting on each side of
the sliding blocks H and are each pivoted on a pin I passing through the block, the
working length of the levers F is thus increased or diminished as the blocks H slide
in the levers and the centre of the pin I recedes from or approaches the centre of the
rocking shaft D.
The movement of each sliding block H in its lever F is regulated by one or
preferably two links J of any suitable length one end of each being preferably
pivoted on the pin I and their other ends are pivoted on and work about a fixed pin K
secured to and adjustable on the bracket L attached to the framing, the pin I to which
the connecting rod G is pivoted will thus work in a curved path in the opposite
direction to that described by the lever F and will thus approach nearer the centre of
the rocking shaft D in the centre of its motion and recede at the two extremities
thus shortening the working length of the lever F in the centre of its motion and
increasing it at the extremities.
By this arrangement the motion of the carriages M is further accelerated in the
centre of their front and back motion and the said carriages have a corresponding
decrease when in the centre of the frame and at the extreme of their front and back
motion, a little more time is thus gained for the carriages to change from one catch
bar to the other, and for the threads to take up à fresh position, so that the cams on
the Jacquard are not required so sharp and consequently have a smoother motion.
In a lace machine in which each catch bar is operated by a separate rocking shaft
connected by links to compound levers (which in some cases take the form of discs)
actuated by cranks through connecting rods, each connecting rod may be pivoted to
a block or slide sliding on the compound lever or disc and governed by a link or
links working about a fixed centre in the same manner as hereinbefore described.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. In a lace machine the method of imparting a variable speed to the carriages by
means of one or more arms such as F the point of connection of which with the
connecting rod G varies according to the position of the said arm substantially as
described.

page_text: 2. In a lace machine the employment of a lever such as F having a varying
working length substantially as and for the purpose herein described.
3. In a lace machine the combination with a lever such as F and sliding block
such as H to which the connecting rod G is connected of one or more links such as J
working about a fixed centre substantially as and for the purpose described and
illustrated in the accompanying drawings.
1000
WILLIAM WALLIS.
GEORGE LONGDEN.
W. P. Thompson & Boult,
Agents for the Applicants.