Improvements in Means for Traversing the Roving or Thread Guides in Mules and Twiners Used for Spinning and Doubling Cotton.
Year: 1889

page_text: Date of Application, 1st Oct., 1889-Accepted, 9th Nov., 1889
COMPLETE SPECIFICATION.
Improvements in Means for Traversing the Roving or Thread
Guides in Mules and Twiners Used for Spinning and Doubling
Cotton.
I JOHN HOPWOOD of 115 York Street Heywood in the County of Lancaster Mule
Overlooker 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 :-
My invention relates to that part of a mule or twiner known as the "traverse-
motion, the object of which is to prevent the threads from indenting or grooving
the leather covering of the drawing or delivery rollers which would inevitably occur
if the threads were allowed always to pass through precisely the same spot.
For this purpose in the ordinary traverse motion" a guide rail (provided with
guide plates or wires through which the threads pass) is caused to traverse constantly
to and fro at the back of the rollers, in a direction parallel to the axes of the same,
so as to cause the position of the threads to be moved to and fro laterally instead of
always remaining at one place.
The
traverse motion is communicated to the guide rail by means of a lever
actuated by a cam cast with a worm wheel to which motion is communicated by
means of a worm on the end of the roller shaft.
This cam has two indentations and two rises or elevations and the short arm of the
lever (which has a rounded surface is held in contact therewith by means of a coiled
spring, and although the action of this "traverse-motion" produces more or less of
the desired effect, yet it is found in practise that in consequence of the form of the
working surface of the cain and that of the short arm of the lever working in contact
therewith there is still a certain amount of "dwell" at each end of the traverse which
has the effect of grooving or indenting the leather, and the object of my invention is
to remedy this defect in a more perfect manner than hitherto.
The nature of my said invention and the manner in which the same is to be por-
formed or carried into practical effect will be readily understood on reference to the
sheet of drawings hereunto annexed and the following explanation thereof.
Fig. 1. on the drawing is a side elevation of my improved traverse cam
and lever.
Fig. 2 is an elevation of the cam turned one quarter round and
Fig. 3 is a face view of the same.
Fig. 4. is a diagram showing the development of the circumference of the ordinary
traverse cam, and
Fig. 5 is a similar diagram of my improved cam.
It will be seen on referring to Fig. 4. that the ordinary cam has only one rise and
one fall in the circumference namely a fall from a to band a rise from 6 to a.
The angles at a, and therefore are very obtuse and the short arm c of the lever
(shown in section) being of a rounded form there is a certain amount of "dwell" at
each change of direction which causes an indentation or grooving of the leather.
According to my invention (see Fig. 5) I make two rises in the circumference
vist. from d to e and from to g, and two falls, vizt. from e, to fand from g, to d
whereby I obtain four changes of direction to each revolution (instead of two only)
and a much more acute angle and consequently less "dwell" at each change. In
addition to which I make the section of the short arm of the traverse lever of an
angular form as shown at Fig. 5 which assists in making the change of direction
instantaneous.
And in order further to prevent the grooving of the leather I make the points e
and g at different heights above the base line, and the same with indentations d

page_text: and which are not on the same level. I therefore not only have four changes at
each revolution but these changes are also made at four different places and hence the
liability to groove the leather is reduced to a minimum.
In Figs. 1. 2. and 3 i is the cam, & the worm wheel and the traverse lever.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
--
The peculiar construction of the traverse cam and traverse lever as hereinbefore
particularly set forth and represented on the drawings annexed.
Dated this 30th day of September 1889.
GEORGE DAVIES,
4, St. Ann's Square, Manchester, Agent for the Applicant.