Improvements in Bobbins and Carriages for Lace Machines.
Year: 1894

page_text: PROVISIONAL SPECIFICATION.
Improvements in Bobbins and Carriages for Lace Machines.
I EDWIN WHITWORTH of Bunbury Street Nottingham, Consulting Engineer
do hereby declare the nature of this invention to be as follows:-
The object of this invention is to improve the construction of bobbins and
It consists in a means of
carriages and to make them more economical in use.
regulating the pressure of the spring on the bobbin instead of resetting the spring
which is the ordinary practice; this is an uncertain operation and takes more time
than ought to be required for such a purpose. In this invention I provide a means
of altering the pressure of the spring by definite mechanical arrangements enabling
the desired pressure to be attained by positive means either with the bobbin in the
carriage or out of it. As a result of my experiments I find that it is essential in
regulating or applying a means of regulation to this spring that the spring should
not be deprived of its freedom of movement as at present used and that any means
of regulating the spring applied at the upper end or along its upper extremity
though capable of effecting a regulation of pressure, is still objectionable in that
it deprives the spring of some of its freedom of movement.
Instead of using a spring brazed or soldered into the carriage I propose to make
the spring attachable to the carriage by a pin screw, or rivet, and at a point below
its present point of flexure, and so arrange the recess holding the spring that
it carries a means of altering the position of the spring in relation to the bobbin.
This enables the pressure of the spring on the bobbin to be easily and quickly
regulated.
Instead of attaching this spring by its lower extremity it can be secured at
a point above it, so long as the flexure of the spring as a whole is as free as at
present.
I also find that a small attachment to the spring in the form of a lever made so
as to move with some freedom on the spring and carrying a means of varying
the pressure of the lever upon the spring without pressing on the carriage, allows
the spring to be regulated without interfering with its usual freedom, or a moving
piece from the carriage pressing upon the spring as close as possible to its point of
support, or an attachment sliding on the spring may engage with a recess in the
carriage near the root of the spring and by its being more or less rigidly held, may
increase or decrease the pressure exerted by the spring on the bobbin; it will be
obvious that I do not confine myself to this precise arrangement above described
but I purpose to use any convenient mechanical arrangement by which the pressure
of the spring may be regulated without interfering prejudicially with its freedom
of movement.
Dated this 17th day of November 1894.

page_text: I EDWIN WHITWORTH of Bunbury Street Nottingham Consulting Engineer
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:-
The object of this invention is to improve the construction of bobbins and
carriages and to make them more economical in use. It consists in a means of
regulating the pressure of the spring on the bobbin instead of resetting the spring
which is the ordinary practice; this is an uncertain operation and takes more time
than ought to be required for such a purpose. In this invention I provide a means
of altering the pressure of the spring by definite mechanical arrangements enabling
the desired pressure to be attained by positive means. In order that my invention
may be fully understood I have annexed the following drawings and description.
Fig. 1 shews the spring A placed in a suitably shaped recess D in the carriage B
and attached to it by a pin C so that it can move within this recess on this pin C.
The recess D also carries a sliding adjusting piece E to fix the spring A in the
desired position, the adjusting piece E is carried by a pin F moving in the slot G
which is so shaped with relation to the spring A that the adjusting piece E being
slided in the recess D and guided by the slot G causes the spring A to be moved
nearer to or further from the bobbin H and so varies the pressure of the spring
on it.
Fig. 2 is an enlarged view of the recess D shewing the sliding adjusting piece E
in two positions; to retain the sliding adjusting piece E in the desired position in
this recess I roughen or serrate the bottom of this recess and construct the adjusting
piece E in such a way that it has a slight spring imparted to it by having its edge
turned down, this enters into the serrations and retains it in the desired position
until it is required to be again moved, which is easily effected by pressing against
it and causing the slight spring to ride over the serrations.
Fig. 3 shews the spring A pivotted at the point I and its tail extension J is
provided with a pin K which can enter the holes L and the tail extension J is made
to spring so that the tail piece J and its pin K may be lifted up and moved from
one hole to another in the series L, this forms an adjustment of the spring A. and
varies its pressure on the bobbin H.
Fig. 4 is a section of the same enlarged.
Fig. 5 shews a small attachment to the spring A in the form of a lever M made
so as to slide on the spring A. and carrying a small wedge shaped piece N which
slides between the spring A and the lever attachment M this wedge shaped piece
being moved along the attachment M causes an alteration in the curvature of the
spring A and thus varies its pressure on the bobbin H; this method applies more
particurlarly to the alteration of the springs attached in the ordinary manner to the
carriage as shewn in Figs. 5. 6. & 7.
Fig. 6 shews a small sliding attachment dovetailed in the carriage B and
capable of sliding in it, the lower end of this sliding piece O presses on the spring A
and can be made to adjust the pressure of this spring on the bobbin H, the
direction of this dovetailed slot in relation to the spring is made so that the
resolution of the force of the spring A tends to bind or lock the slide O in
the position in which it has been set.
Fig. 7 shews an attachment P sliding on the spring A. and its lower extremity
engages with a recess Q in the carriage B near the root of the spring A this end
of the moving attachment P engages more or less (as it is moved) with the
recess Q and increases or decreases the pressure of the spring on the bobbin H.

page_text: Having now particularly described and ascertained the nature of my invention
I declare that I do not confine myself to the precise form or arrangement above
described for performing the same, but what I claim is
Altering the pressure of the spring on the bobbin without it being necessary to
take out the bobbin from the carriage as at present.
Dated this 30th day of July 1895.
EDWIN WHITWORTH.