Improvements in Self-acting Lathes for Turning Hubs of Velocipede Wheels and other Articles.
Year: 1889

page_text: Date of Application, 29th Mar., 1889
Complete Specification Left, 28th Dec., 1889-Accepted, 22nd Mar., 1890
PROVISIONAL SPECIFICATION.
Improvements in Self-acting Lathes for Turning Hubs of Velocipede
Wheels and other Articles.
I, WILLIAM HILLMAN of the Premier Works, Coventry, in the County of Warwick,
Managing Director of Hillman, Herbort and Cooper Limited, do hereby declare the
nature of this invention to be as follows:-
The invention has for its object improvements in self-acting lathes, whereby the
hubs of velocipede wheels and other articles, may be accurately turned to given
designs and sizes automatically.
For this purpose I employ a lathe which has a back or driving shaft, a cam shaft,
a bed, a fixed head stock, a back centre, and a double tool slide, that is to say, a main
slide capable of being traversed along the bed, and a tool slide capable of traversing
in guides on the main slide in a direction at right angles to the bed.
The headstock spindle is rotated by a chain passing around a chain wheel on the
driving shaft and around a chain wheel on the said spindle.
The driving shaft gives motion to the cam shaft by chain and chain. wheels and
suitable gearing.
The cam shaft carries a grooved or barrel cam, which, by acting on a roller carried
by the main slide, gives the necessary longitudinal traversing motions thereto; an
edge cam acts upon a roller, carried by the tool slide, to give the necessary transverse
motions thereto, and the tool slide is kept up to its cam preferably by a weighted lever
acting thereon.
A notched disc is fixed on the cam shaft, and a nib, from a disengaging or stop
lever, is pressed against the side of said disc, so that when the notch comes opposite
the nib, the latter slips into the notch and the lever is caused to throw the driving
pulley out of gear with the driving shaft. The lathe spindle is formed hollow, and
has its front end split into jaws, which are capable of being forced together by a
nozzle screwing on to a screw thread formed on the lathe spindle. Into the back
end of the hollow spindle is passed an adjusting screw and into the front end is passed
a hollow spindle, into which the adjusting screw is screwed; the driving plate is
screwed on to the front end of the hollow spindle, and the latter is made with a conical
recess to receive the centre on which the carrier is mounted. The hub or other
article to be turned is thus capable of being adjusted in position for the cutter to
commence its work, when, by the action of the two slide cams, the cutter is made to
move to and from the hub or other article, and to traverse the required distance
along the same, until rather more than the half of the length thereof is turned;
the said article is then reversed in position in the carrier and the operation again
repeated.
.:
The carrier is formed with two recesses, the one to receive the rough flange of the
unturned hub or other article, the other recess to receive the turned flange or finished
part.
If desired the cams can be so formed as to complete the turning of the article
operated upon without reversing the latter.
Doted this anth da of Man 1980
• WILLIAM HILLMAN.
By Harris & Mills,
23, Southampton Buildings, Agents.

page_text: Figure 4. is a cross section on the line 1. 1. of Figure 1. representing my improved
self acting lathe.
Figure 5. is a longitudinal vertical section of the headstock drawn to an enlarged
scale.
Figure 6. is a longitudinal section of. the driving plate and carrier showing the
work in position.
Figure 7. is a front elevation and,
Figure 8. is a top or plan view of the carrier separately.
Figure 9. is a section through the driving pulley a showing parts connected
therewith and
Figure 10. a section of parts drawn on the line 1. 1 of Figure 9.
In all the Figures like parts are indicated by similar letters of reference.
In carrying my invention into effect I employ a lathe which has a back or driving
shaft A, a cam shaft B, a bed C, a fixed headstock D, a back centre E, and a double
tool slide F, that is to say a main slide capable of being traversed along the bed (
and a tool slide f* capable of traversing in guides on the main slide f in a
direction at right angles to the bed C.
The headstock spindle d is rotated by a chain passing around a chain wheel a' on
the driving shaft A and around a chain wheel d' on the said spindle d. The back or
driving shaft A is driven by a strap or band, from any suitable motive power, passing
around the pulley a mounted on such driving shaft A and capable of being firmly
connected therewith or disconnected therefrom as will be hereafter described.
The driving shaft A gives motion to the cam shaft B by means of a chain passing
around the chain wheels a, b and suitable gearing b¹, g as shown in the drawing, or
other suitable arrangement of driving gear may be employed.
The gear wheels are mounted on a stud g¹ carried by an lever. g³ the short
vertical arm of which is mounted on a stud g fixed to the bracket a³ thereby affording
facility for instantaneously stopping the motions of the machine by turning the
lever on its axis and thereby removing the gear wheels g out of gear with the
gearing b¹.
The cam shaft B carries a grooved or barrel cam 6 which by acting on a roller f
carried by the main slide gives the necessary longitudinal traversing motions
thereto but if desired a face cam may be employed in lieu of the grooved or barrel
cam 62 in which case a spring would be employed to keep the roller f against its
Cam. An edge cam 3 acts upon a roller 3 carried by the tool slide to give the
necessary transverse motions thereto and the tool slide f* is kept up to its cam 6³
preferably by a weighted lever facting thereon.
*
The roller is of such length as to permit of the required longitudinal traverse
of the main slide fand yet remain in contact with its cam 6³.

page_text: For the purpose of enabling the machine to stop automatically when the cutter has
completed its work on the article in the lathe the following arrangement is employed.
A notched disc b' is fixed on the cam shaft B and a nib h¹ from a disengaging or stop
lever his normally pressed against the outer side of said disc b' by a spring h³ acting
on one end of the lever thus when the notch 6 in said disc 64 comes opposite the
nib A, the latter by the action of the spring on the lever is caused to slip into
the said notch and the said lever h is caused to throw the driving pulley a out of
gear with the driving shaft. The preferred arrangement for throwing the driving
pulley into and out of gear with the driving shaft is as follows :-
The back end of the lever takes into the groove a* in the sleeve of a sliding
cam a which when in one position presses outwards the outer ends of levers as which
at their inner ends a are pin jointed to lugs formed on guides a fixed to or forming
parts of the driver a fixed on the driving shaft A; within the guides a are mounted
two sliding segmental friction clutches a which are capable of being pressed
outwards by the levers a' against the inner surface of the driving pulley a in which
position they would connect said pulley a firmly with the driving shaft A and
thereby cause rotary motion to be communicated to the latter. When the sliding
cam a is forced in the contrary direction by the lever h so as to carry it away
from the outer ends of the levers a (as shown in the drawing) the segmental
friction clutches a will no longer be forced against the interior of the rim of the
driving wheel a and the latter will therefore immediately stop. And in order that
the driving pulley a may be disconnected from its shaft at any moment I mount
the nib in a guide hole in the lever h and I connect it to one end of a
short lever h³ mounted on an axis of motion * carried by a projection from the
lever the other end of which short lever h³ is acted upon by a spring to cause
the nibh normally to project below the lever h. By these means if the operator
should at any time desire to throw the driving pulley a out of action when the
nib is resting against the outer side of the notched disc 6' he has only to depress
the forward end of the short lever h³ and thereby raise the nib above the
periphery of the notched disc b when the lever his at liberty to turn on its axis so
as to carry the sliding cam a³ away from the levers a³.
I would here remark that the above described driving pulley clutch mechanism
separately considered forms no part of my present invention and that other suitable
arrangements may be employed in lieu thereof.
The lathe spindle d is formed hollow, and has its front end coned and split into
jaws which are capable of being forced together by an internally coned and
screwed nozzled screwing on to a screw-thread formed on the lathe spindle d just
behind the conical split end thereof. Into the back end of the hollow spindle dis
passed an adjusting screw d³ and into the front end is passed a hollow spindle d*
into which the adjusting screw d³ is screwed; the driving plate (see Figure 6.)
is screwed on to the front end of the hollow spindle and the latter is made
with a conical recess de in its front end to receive the centre d' on which the hub i
or other article to be turned is mounted. The carrier d is formed with two
recesses of different diameters the one to receive the rough flange of the unturned
hub or other article, the other to receive the turned flange or finished part.
The carrier is made in two parts adjustably connected together by a screw d
on each side thereof and it is provided with a fork on one side thereof to fit over
the driving pin do of the driving plate d³.
The hub or other article to be turned is thus capable of being longitudinally
adjusted in position for the cutter to commence its work, and the carrier d³ is
capable of adjustment to minute differences of size in the rough or partially finished
article. The following construction of parts may however be adopted in lieu of that
above described for securing the longitudinal adjustment of the work in relation to
the cutter. The lathe spindle or mandril d may be made solid and have its front end
coned out in a similar manner to that of an ordinary lathe whilst the adjustment of
the article in position for the cutter may be effected by causing the entire headstock D
to be slidden along the bed C of the machine by means of a short screw mounted in

page_text: a lug on, the end of the bed C and screwed into the end of the beadstock D I have
not, thought it necessary to represent the above modification in the drawings as such
will be clearly, understood from the above description. By the action of the two
slide cams 62, 63, the cutter jis made to move to and from the hub or other article
to be turned and to traverse the required distance along the same until rather more
than the half of the length thereof is turned, the said article is then reversed in
position, end for end in the carrier d³ and on the centre d' and the operation repeated:
If desired the,cams 636 can be so formed as to complete the turning of the hub
or other article operated upon without reversing the latter in position in its carrier
but the arrangement represented in the drawings is preferred. Previous to placing a
velocipede hub in the lathe, it is bored and the bearing chases fitted and finished.
"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
1. In self acting lathes for the purpose described the peculiar arrangement and
combination of parts substantially as herein shown and described.
2. In self acting lathes for the purpose described, the combination with suitable
driving gear of an adjustable bollow spindle fitted with centre, carrier and driver, a
compound tool slide, cams for giving a traversing and transverse motion to the com-
pound tool-slide, and a notched disc and stop lever acting automatically to stop the
motions of the lathe when the work on the hub or on one half thereof has been
completed all substantially as herein shown and described.
Datad this 28th dov of Desemba 1000
WILLIAM HILLMAN.
By Harris & Mills,
23, Southampton Buildings, London, Agents.