Improvements in Twist Lace Machines.
Year: 1892

page_text: Date of Application, 26th May, 1892
Complete Specification Left, 25th Feb., 1893-Accepted, 20th May, 1893
PROVISIONAL SPECIFICATION.
Improvements in Twist Lace Machines.
I, HENRY SMITH CROPPER, of Great Alfred Street, in the Town and County
of the Town of Nottingham, Engineer, do hereby declare the nature of this inven-
tion to be as follows:-
My invention consists of improvements applicable to such twist lace machines as
work without points, using (partly in substitution of points) a carriage of triangular
shape, the breast of which may be either straight, convex or concave, as may be
deemed most expedient.
My improved apparatus, which, for convenience, I call a nipping apparatus,
consists of two bars ranging from end to end of the machine, one of which is fixed,
the other having a vibratory motion imparted to it, which causes it to press against
the fixed shaft. One or both of these shafts may be covered with india rubber or
other suitable material to form a cushion.
1
The spool threads, or any other threads upon which it is deemed desirable for my
apparatus to act, whether such threads be carried on spools or on beams, are
passed between the two bars above described. It will thus be seen that at each,
motion of the vibratory bar, the threads operated upon will be held tight, or
comparatively tight according to requirements, whilst the carriages are taking up
the twist, or whilst certain threads are thrown across the breast of several carriages.
This prevents the carriages driving the threads before them and also prevents any.
sudden snatch being made at either spools or beams.
By means of my invention I am able to make a fabric with a firmer and better
face than is possible to make with triangular carriages without my nipping
apparatus.
I do not confine myself to the form of nipping apparatus herein described, but
use either this or other method of applying tension for the purpose mentioned to
certain threads in twist lace machines in which triangular carriages are employed.
Dated this 26th day of May 1892.
:
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HENRY S. CROPPER,
By Harris & Mills,
23, Southampton Buildings, London, W.C., Agents.
COMPLETE SPECIFICATION.
Improvements in Twist Lace Machines.
I, HENRY SMITH CROPPER of Great Alfred Street in the Town and County
of the Town of Nottingham Engineer do hereby declare the nature of the said
invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement:-
My invention consists of improvements applicable to such twist lace machines as
work without points, using (partly in substitution of such points) a carriage of
triangular shape the breast.of which may be either straight, convex or concave as
may be deemed most. expedient.
My improved apparatus which for convenience I call a nipping apparatus
consists of two bars ranging from end to end of the machine, one of which is fixed,
the other having a vibratory motion imparted to it which causes it to press against
the fixed bar. One or both of these bars may be covered with india rubber or
other suitable material to form a cushion. The spool threads, or any other threads
upon which it is deemed desirable for my apparatus to act, whether such threads
Price 8d i

page_text: be carried on spools or on beams, are passed between the two bars above described.
It will thus be seen that at each motion of the vibratory bar the threads operated
upon will be held tight or comparatively tight according to requirements whilst
the carriages are taking up the twist, or whilst certain threads are thrown across
the breast of several carriages. This prevents the carriages driving the threads
before them and also prevents any sudden snatch being made at either spools or
beanis.
My said invention is illustrated in the accompanying drawing which is a cross
sectional elevation of so much of a lace machine of the character above referred to
as will enable me to describe the application of my invention thereto.
a represents one of the carriages which are of triangular shape and work without
points, b. b, are the combs in which the carriages work, c, c, are the catch bars for
moving the carriages to and fro in their combs and which may be actuated in any
suitable or well known manner, d d are guide bars through which the, spool
threads e, or other threads not being bobbin threads, pass; f, f, are selectors
mounted on a bar, and operated in the usual manner, y is a sley through which
the threads e are passed, and h, is the facing bar. The above parts separately
considered form no part of my present invention I therefore make no claim thereto.
The threads e, pass up between two bars i, j; the bar is rigidly fixed to the
standards of the machine and is covered with india rubber or other suitable material
to form a cushion whilst the nipping bar i, is mounted in bearings fixed on the
standards of the machine and has a vibratory motion imparted thereto by means of
a cam k, acting upon a roller, at the end of an arm j', fixed to such nipping bar j.
The cam k is timed to work the nipping bar so as to nip and hold the threads e
against the bar, i, when the carriages are in the centre of their motion and to
gradually release the threads e, as the carriages reach the extremity of their motion.
The nipping bar has its face preferably hollowed to fit the convex surface of the
j
bar, and thereby secure an efficient grip of the threads e.
By means of my invention I am able to make a fabric with a firmer and better
face than it is possible to make with a lace machine working with triangular
carriages and no point bars and without my thread nipping apparatus applied
thereto.
I would here remark that I do not confine myself to the form of thread nipping
apparatus herein described but I may use this or other method of applying tension
to, and taking it off from the threads e, at the required times for the purpose
mentioned in twist lace machines in which triangular carriages are employed.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
The combination with twist lace machines, working without points and using
triangular carriages, of nipping or tension apparatus acting at the times required
to apply tension to and to remove it from the spool or other threads not being
bobbin threads substantially as herein shown and described and for the purpose
stated.
Dated this 25th day of February 1893.
Dated this 25th day of February 1893.
H. S. CROPPER,
By Harris & Mills,
23, Southampton Buildings, London, W.C., Agents.