Improvements in Metal-slotting Machines.
Year: 1897

page_text: Date of Application, 7th Apr., 1897
Complete Specification Left, 7th Jan., 1898-Accepted, 26th Mar., 1898
Improvements in Metal-slotting Machines.
I, WILLIAM THOMAS SMITH, Managing Director of the Firm of William T. Smith
and Company, Limited, of Marsden Road Works, Bolton, in the County of
Lancaster, Engineers and Machine Makers, do hereby declare the nature of this in-
vention to be as follows:-
That is to say In the usual kind of machines employed in the cutting of metal
and known as slotting machines the return or ineffective stroke of the cutting tool
occupies or entails an expenditure of as much time as does the outward or effective
stroke, hence considerable time is wasted and expenses are thereby incurred.
To produce mechanism that will perform the return or ineffective stroke of the
cutter at a greatly increased speed as compared with that of the other stroke, and
by the employment of parts that are of comparatively little cost and yet that will
allow the adjustment or regulation of the stroke of said cutter to be readily
effected, is the object of this invention.
This object I attain by mounting the tool-holder upon the sliding-ram and
arranging this latter to be coupled to an operating-lever by suitably formed link
or rod connections constructed so that the said tool-holder may be adjusted thereon
to perform its functions nearer to or further from its operating-lever as occasion
may necessitate. The adjusting of the tool-holder is effected by screw and other
devices arranged so that such adjustments may be easily carried out.
The lever, which transmits motion to the tool-holder is pivotally mounted on a
sliding block supported by a link or arm arranged to swivel on its bearings carried
by the machines framework, while at its inner end, or at that end not secured
to the tool-holder, is mounted a cam wheel arranged to rotate on its axial-pin or
shaft carried by said lever.
This cam wheel is arranged to mesh with a pinion mounted on the machine's
motor shaft to which motion is transmitted by any well known arrangement of
cone pulley and belt drive mechanism and to this pinion is secured a flange or
drum to receive a flange or drum formed on or secured to the cam wheel above
described, this latter drum resting upon and being in rolling-contact with the drum.
on said pinion, by which means the teeth formed on said pinion and cam wheel
are prevented from being forced too deeply into gear.
The sliding block above described for adjusting the length of stroke of the cutting
tool is moved along its slot in the lever by a screw working within it, a counter
screw working in connection with said screw forming an index from which can
be seen the exact length of stroke.
100K
WILLIAM T. SMITH,
Per Samuel Hey,
Agent.

page_text: Improvements in Metal-slotting Machines.
I, WILLIAM THOMAS SMITH, Managing Director of the Firm of William T. Smith
and Company Limited, of Marsden Road Works, Bolton, in the County of
Lancaster, Engineers and Machine Makers, do hereby declare the nature of this in-
vention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
That is to say: In the usual kind of machines employed for the cutting of metal
and known as slotting machines the return or ineffective stroke of the cutting tool
occupies or entails an expenditure of as much time as does the outward or effective
stroke, hence considerable time is wasted and expenses are thereby incurred.
To produce mechanism that will perform the return or ineffective stroke of the
cutter at a greatly increased speed as compared with that of the other stroke, and
by the employment of parts that are of comparatively little cost and yet that will
allow the adjustment or regulation of the stroke of said cutter to be readily
effected, is the object of this inventiou, and this object I attain by the mechanism
hereinafter described and as illustrated by the accompanying sheets of drawings
in which:-
.
Fig. 1 is a side elevation of the upper part of a slotting machine. The parts
omitted from this view being those of ordinary construction or formation.
Fig. 2 is a sectional plan of parts shown by Fig. 1.
Fig. 3 is a similar view to Fig. 2 but illustrates a modification hereinafter
described.
Fig. 4 is a diagram illustrating the relative positions of the several parts during
certain of their movements.
ram
B indicates the machine's framework, C the cutting tool and D the tool holder.
The holder is secured to the ram a which is arranged to slide upon the face b
of the framework B in the usual manner. However to transmit motion to this
a, it is secured by the link or connecting part c, the adjusting
screw d and the coupling pin e to the operating lever f, the said adjusting screw d
being used for the purpose of raising or lowering the ram a relatively with the
coupling pin e in order that the tool C may be adjusted to perform its functions
nearer or further from its operating lever f as occasion may necessitate. The raising
of the part c by the screw d is performed through or by a winch handle 9, shown
by Fig. 2 in broken lines, operating a worm which imparts motion to the worm
wheel through which an internal screw or thread is formed for the reception of
the screw d, by which means, and since said wheel k is held rigidly except for its
rotary motions, the said screw d is raised and lowered as the handle 7 is rotated
in one direction or the other as will be understood.
The lever is pivotally connected by the sliding block m and pin n to the
link P
which swivels on the pin g secured to the framework B, while at its inner
end is mounted the cam-wheel so that it may rotate upon the pin s carried by
said lever f.
This wheel r is arranged to mesh with a pinion t mounted upon the shaft u
carried by the framework B, and which shaft has a driving cone v
at its outer end for receiving the driving belt, while at the other
end of the shaft u is the hand wheel w for effecting any slight movements
manually as may from time to time be required.
The pinion is of ordinary formation but it has a flange or disc t¹ formed on or
fixed to it, and preferably of a size corresponding with that of the pitch circle
of its teeth in order that a flange or disc ¹ formed on the cam-wheel r (which

page_text: cam-
in like manner corresponds with the pitch circle of the said
wheel) by which means these flanges or discs t¹ and 71 may be kept in constant
rolling contact with each other and their respective wheels prevented from being
forced too deeply into gear. The cam wheel and its flange rare of such an
irregular and eccentric shape as may be thought or found to be suitable for im-
parting irregular motion to the lever as it (said wheel r) is rotated, since as will
clearly be seen, when this wheel and its dise are rotated, as their pivotal pin s
approaches the pinion t their speed will be increased while as they continue their
motion to cause the cam discr¹ to roll on the disc and raise the pins (see Fig. 4)
and its lever f the speed of same will decrease, and such increased speed is
arranged to take place as the ram a is performing its upward movement while
during its descending stroke it is caused to travel at a slower rate.
Since the pin e which couples the lever f to the sliding ram a is caused to travel
in the same straight course through which said ram a moves, it is necessary that
the fulcrum n of the lever f should be free to move and accommodate itself to
such straight course of the pin e and this I attain by mounting the pin n on the
end of the link p. Yet, however, I obtain a further advantage by making use
of the link p and sliding block m, because by arranging the adjusting or regulating
screw to engage with this block I can easily change its position within the slot
of the lever causing this lever f to impart a less stroke to the ram a as the block m
is brought nearer to the pine or to increase the length of such stroke as this
block m is made to approach the pin s. Again as the movements of the block m
by the screw always agree with or are in exact proportions to the variations that
may be desired to be produced in the movements of the ram a, by having a counter
screw y sliding longitudinally and freely within said screw but so formed as
always to be operated therewith when the hand wheel 2 is used to rotate the screw x
in order to move the block m, said screw y by passing through the correspondingly
threaded holding piece y' may be used as a pointer or indicator to show by its
thread forcing it beyond or drawing it within the piece y exactly the length of
stroke the ram a is making, the further it extends beyond the piece y¹ the less will
such stroke be, while when it is at the extremity of its movement in the other
direction or within the piece y¹ the said stroke will be greatest, the spaces between
the two being shown by graduation marks made on a flattened part of said
screw y thus to act as the indicating means for any stroke desired.
The ram a, holder D and tool Care counterbalanced by weights being placed
upon the rod f' in the manner well known.
In Figures 1 and 2 the cams or discs r¹ and t¹ are shown as being on one side
of the wheels and t respectively, but I am perfectly aware that they may be made
on both sides of these wheels as shown by the sectional view Fig. 3.
Having now particularly described and ascertained the nature of my said in-
vention, and in what manner the same is to be performed, I declare that what I
claim is:-
1. In a slotting machine a ram made to slide upon the framework, a lever for
transmitting motion to said ram, a cam-wheel having a cam-disc or flange secured
to it, said wheel and disc being mounted on said lever, a pinion and disc or flange
secured to it and means for operating said pinion, in combination the same being
arranged substantially as specified.
2. In a slotting machine, the combination of a sliding ram, adjustable means
for securing said ram to its operating lever, said operating lever, a cam-wheel
carrying a cam disc mounted on said lever, a pinion for transmitting motion to said
cam-wheel and cam disc, and means for rotating said pinion substantially as
specified.
3. In a slotting machine the combination of a sliding ram, means for securing
ame to its operating lever, said operating lever, a link or lever arm upon which
he operating lever is pivotted and means for transmitting motion to said operating
ever substantially as herein specified.

page_text: 4. In a slotting machine the combination of a sliding ram, a lever for operating
said ram, means for securing said lever to said ram, a link for bearing the fulcrum
pin of said operating lever, means for transmitting motion to the operating lever,
à sliding block mounted upon the pin carrying the operating lever, a regulating
screw for moving and holding said sliding block to adjust same to obtain the
desired movements of the ram, and means for transmitting motion to said screw,
substantially as herein specified.
5. In a slotting machine, the combination of a sliding ram, a lever, having an
adjustable fulcrum pin for operating said ram, means for supporting said fulcrum
pin, mechanism for transmitting motion to said lever, and mechanism for indicating
the length of the stroke or space through which the ram is operating substantially
as herein specified.
W. T. SMITH,
Per Samuel Hey,
Agent.