Improved Stop-mechanism for Stamping Presses and other Machines.
Year: 1893

page_text: Date of Application, 8th Aug., 1893
Complete Specification Left, 8th May, 1894-Accepted, 16th June, 1894
Improved Stop-mechanism for Stamping Presses and other
Machines.
I, CLAUD THORNTON CAYLEY, of Acre Street, New Road Wandsworth Road,
in the County of Surrey, Engineer, do hereby declare the nature of this invention
to be as follows:-
This invention is chiefly designed to prevent accidents with stamping presses
and other machines which are driven intermittently through the medium of a
clutch on a continuously rotating shaft.
A stamping press usually has a vertical spindle or mandrel on the lower end of
which the stamp or die is carried, the said spindle or mandrel being so arranged
that by means of a treadle the clutch is operated to put the main or crank shaft at
the press into gear with a shaft carrying a fly wheel and thereby bring the stamp.
or die forcibly down upon the article to be stamped. It sometimes happens that
the operator forgets to remove his foot from the treadle after the descent of the
stamp and the press continues to operate so that the operator in an unguarded
moment may expose himself to serious injury.
My present invention affords the means for preventing such accidents. It
consists of mechanism which is constructed and combined with the stamping press
or other apparatus or machine as follows, that is to say :-On the main or crank
shaft of the press or machine I key or otherwise firmly fix a disc provided with a
pin or stud projecting from its face; and in front of this disc I arrange a lever so
that its free extremity lies in the path of the revolution of the said pin or stud.
The said lever is pivotted to a vertical spindle which slides in bearings supported
on the frame of the press and which is connected with any suitable means for
moving the clutch mechanism to put the shaft of the machine into or out of gear
with the fly wheel shaft. The said spindle also extends into contact with the end
of a lower spindle or rod which is connected with the treadle so that when the
operator depresses the treadle the said spindle will be pulled down, against the
resistance of a spring..
The aforesaid lever which is pivotted to the upper vertical spindle extends down
beyond its pivot or fulcrum and its lower end is furnished with a hook or projection
which engages with a collar on the upper end of the lower spindle or rod under
which collar it is held by a spring at the back of the lever.
It is obvious that while the hooked end of the lever is thus in engagement with
the treadle rod or spindle the treadle, when depressed, will draw the lever down
with it. Therefore when it is desired to start the press the operator applies his
foot to the treadle thereby drawing down the said spindle and lever in which
movement the said lever actuates the clutch-mechanism to put the main shaft into
gear with the fly wheel shaft and thus start the press into operation. But this
operation cannot continue for more than one revolution of the shaft for when that
is accomplished the pin or stud on the disc comes in contact with the extremity of
the lever and operates the same to release it from the aforesaid lower or treadle
spindle and when thus released the lever and with it the upper vertical spindle are
raised by the action of the spring and thereby the clutch mechanism is moved to
disengage the main shaft from the fly wheel shaft and thus stop the press.

page_text: Therefore if the operator should forget to remove his foot from the treadle no
accident or inconvenience will result from his forgetfulness.
Dated this 8th day of August 1893.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.
Improved Stop-mechanism for Stamping Presses and other
Machines.
I, CLAUD THORNTON CAYLEY, of Acre Street, New Road, Wandsworth Road,
in the County of Surrey, 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 :-
My invention relates to stop-mechanism for stamping presses and other machines
and is chiefly designed to prevent accidents with machines which are driven
intermittently through the medium of a clutch on a continuously rotating shaft.
In such machines the clutch is usually controlled by a lever worked by the foot
of the workman through a treadle and connecting rod.
The chief feature of my invention relates to the provision of means whereby the
connection between the clutch lever and the connecting rod is automatically broken
and the clutch thereby released as soon as the shaft of the machine has made one
revolution or in the case of stamping presses, as soon as one impression has been
made. Moreover the clutch cannot be put in gear again until the workman has
taken his foot off the treadle or otherwise released the connecting rod.
In order that my invention may be more clearly understood I will now proceed
to describe the same with reference to the accompanying drawing in which
Figure 1 is an end view, and
Figure 2 is a front view of one form of my improved stop-mechanism.
Like letters denote the same parts in both the figures.
A is the continuously rotating shaft which may be any suitable shaft of the
machine. B is a lever which when pulled puts the clutch into gear, C is the lower
part of the connecting rod which is attached to the treadle by means of the hook C¹,
and D is the upper part of the connecting rod pivotally connected to the lever B
by the bolt B¹.
The rod C slides in an adjustable guide E and the rod D in guides E¹, E' secured
to or forming part of a fixed plate E³. The lower part D' of the rod D beds in
an axial hole in the end of the rod C so that the two rods are always in the
same line. F is a disc keyed or otherwise firmly fixed to the shaft A¹ and provided
with a pin or stud F1 projecting from its face. G is a lever pivoted at G' to a
collar D secured to the upper rod D and arranged so that its free extremity lies
in the path of revolution of the pin or stud F¹. The tail G2 of said lever extends
down below the pivot G' and is furnished with a hook or projection G³ which
engages with a collar C³ secured to the upper end of the rod C. A spring H fixed
to the frame presses the hook G³ under or towards the collar C³. A spiral spring
I placed between the guide E and a collar C secured to the rod C tends to force
the rod C upwards and a second spring J placed between the guide El and the
collar D on the rod D tends to force the rod D upwards. The collar C is
adjustably secured to the rod C by means of a set screw C.
The action of my improved mechanism is very simple and is as follows. As long
as the hook G³ is in engagement with the collar C the two rods C and D are
firmly connected together as shewn in Figure 1 and if the rod C be pulled down
by means of the treadle or otherwise, the lever B will be operated through the
medium of the rod D and will actuate the clutch so as to put the stamping press or

page_text: other machine in gear with the shaft A. The press or machine cannot however
remain in operation for more than one revolution of the shaft A since when that is
accomplished the pin or stud F on the disc F comes into contact with the end of
the lever G and operates the same so as to withdraw the hook G³ from engagement
with the collar C. The rod C is thereby disconnected from the rod D and the
spring J acts to force said rod D upward and so raise the clutch lever B and
release the clutch. Hence after every revolution of the shaft the clutch is
released and the machine put out of gear whether the treadle and rod C be depressed
or not.
If when the lever G has been operated and the rods C and D are disconnected
the rod C be allowed to rise under the influence of the spring I the collar C
striking the bottom of the hook G³ which is rounded as shewn presses the said hook
aside against the spring H and re-enters into engagement therewith. The two
rods C and D are thereby connected together again in readiness to operate the
clutch gear.
By my invention I render it impossible for the clutch to be in gear and the
machine to operate for more than one revolution of the shaft since the clutch is
automatically put out of gear at the end of that time even if the workman forgets
to take his foot off the treadle or otherwise attempt to maintain the clutch in gear.
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. For stamping presses and other machines, a connection between the starting
treadle and the driving clutch so constructed and combined with a rotating part of
the machine that the same is broken as soon as one complete operation of the
machine has been accomplisbed, for the
purpose specified.
2. For stamping presses and other machines a stop-mechanism having two rods
for connecting the treadle with the clutch lever and a lever pivoted to one of the
rods and adapted to be operated by a rotating part of the machine, and when so
operated to disconnect one of the said rods from the other of the same and thereby
release the clutch, for the purpose specified.
3. An improved stop-mechanism constructed substantially as described with
reference to the accompanying drawing, and operating as specified.
Dated this 8th day of May 1894.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.