Improvements in Power Presses.
Year: 1890

page_text: Date of Application, 24th Dec., 1890
Complete Specification Left, 24th Sept., 1891-Accepted, 21st N v., 1851
PROVISIONAL SPECIFICATION.
Improvements in Power Presses.
We JOSEPH SAMUEL TAYLOR and STEPHEN WILLIAM CHALLEN both of
Derwent Foundry Constitution Hill Birmingham in the County of Warwick
Engineers do hereby declare the nature of this invention to be as follows:-
Our invention has reference to certain improvements which we introduce into the
arrangement and construction of power presses used for drawing, punching stamping
or forming articles of metal and for other like purposes, whereby a more intense
thrust or pressure upon the forming or drawing tool or tools is obtained and a more
rigid machine than is at present possible with the existing systems of construction
in ordinary use..
Another part of our invention has reference to the system of adjustment which
we introduce, whereby a perfectly ready means of regulating the position of the
forming tool is possible and easily obtainable.
In carrying our invention into effect we construct the framework of our machine
or press in any usual or ordinary manner, and we mount a crank shaft above the
tool holder and blank holder which crank shaft we construct in a peculiar manner
for the purpose of obtaining greater rigidity of working. We construct the shaft
with a central journal or bearing space arranged between the two crank pins which
revolve within the standards or frames of the machine.
This central journal we form upon the metal of the crank shaft in such a
manner that while being concentric with the outer journals it is of sufficient
diameter to enclose an area of contact with the crank journal equal to the area of
the journal itself when so desired. Thus the large bearing surface serves as a crank
in the centre of the pair of crank pins and the ordinary bearings of the crank
shaft within the standards of the machine support the shaft also on the outsides.
For convenience of manufacture and to cause a distribution of the power upon
the crank shaft we sometimes divide the crank shaft in two portions making the
central large bearing serve as the coupling plate for each length of shaft. When
so dividing the crank shaft we cause each central bearing disc to come into the
same central bearing and to be in true alignment; by means of a central plug or
pin which we place within each portion of the shaft, or we form a projection on
one disc which we cause to enter into a corresponding recess within the other disc.
The bearing for receiving the large central journal disc or discs we carry upon
the underside of the head of our press and we provide a strap or cap when so
required to pass beneath it, although we do not employ a lower cap or cover when
applying our central bearing to presses having an upward thrust only.
We mount upon each crank shaft a spur wheel into which a pinion gears, the
pinions being carried upon the same motion shaft thus receiving their motion from
the same source.
Upon the crank shaft we form a pair of cams for operating the sliding
blank holders which we arrange below. The upward movement of the blank
holder we provide for in the larger presses by means of balance weights and
connecting levers, and by suitably arranged springs in the smaller presses so that
the crank and cam shaft causes only the downward motion of the blank holder
while its upward or return stroke is effected by means of the suspended dead
balance weights and their connections in the larger presses or springs in the
smaller presses. The stroke of the blank holder we arrange to suit any particular
requirement of the machine by giving the fixed cams the desired excentricity;
the stroke of the punch holder being continued after the blank holder has arrived
at the end of its stroke due to the greater throw which we give to the crank

page_text: shaft. We connect the crank shaft direct to the punch holder cross head by
means of suitable connecting rods working upon a common cross shaft carried
within the upper bosses of the tool holder crosshead this shaft being guided
within the frames or standards of the machine by guide or slide blocks arranged
upon each end of the shaft.
We give vertical adjustment to the tool holder by forming a screw upon its
upper stem or stalk, which stem we cause to enter a correspondingly screwed
nut having a flange to permit of its attacliment to the lower portion of the cross-
head by means of an ordinary cover or washer plate. The nut we form in a
peculiar manner with a number of teeth or serrations upon its outer periphery,
and we cause a worm or a small pinion wheel to work into these teeth for the purpose
of giving motion to the nut and thereby raising or lowering the punch holder.
Instead of a worm wheel or a pinion wheel we sometimes employ a ratchet and
pawl to give motion to the punch holder. In each case we arrange a spindle
upon the crosshead for receiving a spanner or lever to operate the ratchet or the
wheel.
By this our improved system of placing teeth upon the outer surface of the nut
we are enabled to obtain a very minute adjustment of the punch holder in a very
convenient position for manipulation of the same.
We do not limit the application of a central bearing, divided shaft or adjustable
punch holder to any particular form of press or machine but employ the same
systems of construction or their mechanical equivalents modified to suit any peculiar
or special requirement.
Similarly we do not limit the application of our invention to any peculiar kind
of friction clutch or gearing for automatically arresting the motion of the press
punch holder at the termination of the upward stroke although we prefer to employ
the system of clutch engaging and disengaging motion as set forth in the Speci-
fication of Patent No. 18550 of 1888 granted to us whereby the motion of the
punch holder is automatically arrested. We combine the steam engine and drawing
press as one compact machine instead of employing separate engine. and parts
working by gearing or other methods on to a separate press; the out end bearings
for our main shaft we also construct so that they may be self contained in one
framework.
Dated this 23rd day of December 1890.
MARKS & CLERK,
13, Temple Street, Birmingham; Agents for Applicants.
COMPLETE SPECIFICATION.
Improvements in Power Presses.
We, JOSEPH SAMUEL TAYLOR, and STEPHEN WILLIAM CHALLEN, both of
Derwent Foundry, Constitution Hill, in the City of Birmingham, Engineers, 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:-
Our invention has reference to certain improvements which we introduce into
the arrangement and construction of power presses used for drawing, punching,
stamping or forming articles of metal and for other like purposes, whereby a more
intense thrust or pressure upon the forming or drawing tool or tools is obtained, and
a more rigid machine produced than is at present possible with the existing systems
of construction in ordinary use. Another part of our invention has reference to
the system of adjustment which we introduce, whereby a perfectly ready means of
regulating the position of the forming tool is possible and easily obtainable.
In carrying our invention into effect when constructing a press of the type
illustrated at Sheet 1 of the accompanying drawings on which Figure 1 is an
elevation, Figure 2 a plan and Figure 3 an end elevation of our general arrangement-

page_text: We construct the framework A, B, C, D, of our machine or press in any usual
or ordinary manner, and we mount a crank shaft E, E, above the tool holder F
and blank holder G, which crank shaft we construct in a peculiar manner for the
purpose of obtaining greater rigidity of working. We construct the shaft E, E',
as shown in detail in Figures 4, 5, and 6 with a central journal or bearing space e, e¹,
arranged between the two crank pins e, et which revolve within the standards or
frames A, A of the machine. This central journal e, e¹ we form upon the metal of
the crank shaft in such a manner that while being concentric with the outer
journals it is of sufficient diameter to enclose an area of contact with the crank
journal equal to the area of the journal itself when so desired. Thus the large
bearing surface e, e¹ serves as a crank disc in the centre of the pair of crank
pins e, e, and the ordinary journals or bearings for the crank shaft within the
standards B, B of the machine support the shaft also on the outsides. For con-
venience of manufacture and to cause a distribution of the power upon the crank
shaft, we sometimes divide the crank shaft in two portions as E, E', making the
central large bearing e, el serve as the coupling plate for each length of shaft.
When so dividing the crank shaft we cause each central bearing disc to come into
the same central bearing and to be in true alignment, by means of a central plug
or pin e which we place within each portion of the shaft, or we form a projection
upon one disc e which we cause to enter into a corresponding recess within the
other disc e¹.
The bearing for receiving the large central journal disc or discs we carry upon
the underside of the head H of our press, and we provide a strap or cap when so
required to pass beneath it, although we do not of necessity employ a lower
cap. or cover when applying our central bearing to presses having an upward
thrust only.
We mount upon each crank shaft E, E¹ a spur wheel K, K' into, which a
pinion L, L gears, the two pinions being each carried upon the same motion
shaft M, thus receiving their motion from the same source. Upon the crank shaft
we form a pair of cams e² for operating the sliding blank holder G which we
arrange below. The upward movement of the blank holder we provide for in the
larger presses by means of balance weights N, N' and connecting rods. and
levers n, and by suitably arranged springs in the smaller presses; so that the
crank and cam shaft with the connecting rods F2, F2 causes only the downward
motion of the blank holder and punch holder while the upward or return stroke
of the blank holder is effected by means of the suspended dead balance weights N, N¹
and their connections n', n³, and cross bar or cross bars n³, in the larger presses, or
springs in the smaller presses. The stroke of the blank holder G we arrange to
suit any particular requirement of the machine by giving the fixed cams the
desired eccentricity. The stroke of the punch holder being continued after.
the blank holder has arrived at the end of its stroke, due to the greater throw
which we give to the crank pins e³, e. We connect the crank shaft E, E' direct
to the punch holder crosshead F by means of suitable connecting rods F' working
upon a common cross shaft F³ carried within the upper bosses of the tool holder
crosshead F, this shaft and tool holder crosshead being guided within the frames
or standards A A of the machine by guide or slide blocks R arranged upon each
end of the shaft... We further guide the crosshead F₁ by means of a central stem F
working in a guide O connected to the crossbars n³.
Figures 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 & 17 are detail illustrations of our cross-
head and tool holder showing more clearly the manner in which we provide vertical
adjustment for the tool holder F by forming a screw upon its upper stem or
stalk, which stem" we cause to enter a correspondingly screwed nut f having a
flange to permit of its attachment to the lower portion of the crosshead by
means of an ordinary cover or washer plate f. The nut f' we form in a peculiar
manner with a number of teeth or serrations upon its outer periphery, and we
cause a worm or a small pinion wheel P to work into these teeth for the purpose
of giving motion to the nut and thereby raising or lowering the punch holder.
.

page_text: Instead of a worm wheel or a pinion wheel, we sometimes employ a ratchet and
pawl to give motion to the punch holder. In each case we arrange a spindle "
upon the crosshead for receiving a spanner or lever to operate the ratchet or the
wheel:
By this our improved system of placing teeth upon the outer surface of the nut,
we are enabled to obtain a very minute adjustment of the punch holder which is
arranged in a very convenient position for manipulation by the spindle.
We do not limit the application of a central bearing, divided shaft or adjustable
punch holder to any particular form of press or machine, but employ the same
systems of construction or their mechanical equivalents modified to suit any peculiar
or special requirement.
:
Similarly we do not limit the application of our invention to any peculiar kind
of friction clutch-gearing for automatically arresting the motion of the press punch
holder at the termination of the upward stroke, although we prefer to employ the
system of clutch engaging and disengaging motion as set forth in the Specification
of Patent No. 18550 of 1888 granted to us, whereby the motion of the punch holder
is automatically arrested.
We combine the steam engine and drawing press as one compact machine instead
of employing separate engine and parts working by gearing or other methods on
to a separate press; the out end bearings for our main shaft we also construct so
that they may be safely contained in. one framework.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is :-
(1) The combination and arrangement of a power driven press having an over-
head crank shaft driven by gearing and provided with an intermediate or central
bearing or thrust block, as and for the purposes herein described and as illustrated
in the accompanying drawings.
(2) The construction of a crank shaft having a central journal or bearing
surface provided thereon substantially as herein and for the purposes described
and as set forth in Figures 4, 5, and 6 of the accompanying drawings.
(3) The construction and arrangement of an adjustable tool holder as and for
the purposes herein described and substantially as illustrated in Figures 7, 8, 9, 10,
11, 12 and 13 of the accompanying drawings.
(4) In a power driven press, the application-of-a- divided-crank-shaft,-sub-
stantially as hereinbefore described and as illustrated in the accompanying
drawings.
(5) The combination and arrangement of a tool holder crosshead such as F¹
having a central stem F* with a central guide such as O carried upon the cross-
bars n attached to and travelling with the blank holder, in addition to the outer
guiding slides R, substantially as hereinbefore described and shown in Figures 7,
9, 16 and 17 of the accompanying drawings.
Dated this 23rd day of September 1891.
MARKS & CLERK,
13, Temple Street, Birmingham, Agents for the Applicants.