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Патент USA US3040695

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June 26, 1962
Filed Nov. 17, 1958
2 Sheets-Sheet 1
June 26, 1962
Filed Nov. 17, 1958
2 Sheets-Sheet 2
% @WM
United States Patent 0 ” ice
Patented June 26, 1962
3,043} 685
‘slots 12. The upper end of the arm is pivotally con
nected to the free end of a lever 16 which is pivoted at
its other end about a stationary axis ‘17. About the
Harry Heywood Ridley, Aldridge, near Walsall, England,
assignor, by mesne assignments, to Sahlin Export and
Trading Company, a corporation of Michigan
Filed Nov. 17, 1958, Ser. No. 774,185‘
11 Claims. (Cl. 113-50)
middle of its length the lever has an integral depending
lug '18 to which is pivotally connected by a pin 19 the free
end of the piston-rod of a substantially vertical air cyl
inder 20 mounted to rock about a ?xed pivot Z1 at its
upper end;
To provide the necessary rigidity the upper part of
This invention relates to work-handling means for 10 the arm 14 is conveniently bifurcated, as shown in FIG
URE 2, with parallel limbs'?tting between the plates 11,
power presses and like machines and more particularly
and’ the rollers 15' are carried on the ends of a spindle
to means for unloading workpieces from such machines.
mounted in a tube 22' extending between and welded to
According to my invention, work-handling means for
the limbs of the fork. The lever 16 is, also bifurcated
power presses or like machines comprises a rigid sub
stantially vertical arm carrying work-gripping means at 15 and is pivoted on a transverse pin mounted in-bosses 23
welded to the inner faces of the plates 11.
its lower end mounted to swing about a point inter~
The arm 14 is telescopic, the lower part being adapted
mediate its ends on a pivot guided for movement along
to telescope into the upper part so that the effective length
a ?xed path, a lever mounted for angular movement
of the arm can be varied to suit different presses.
about a ?xed point and connected at one end to the
upper end of the arm, and ?uid pressure means for 20 A lug 25" pivotally mounted on the lower end of the
arm'1‘4 has secured in it a substantially. horizontal bar 26.
moving the lever angularly to cause the arm to move
A sleeve 27 ?xed on the bar carries a double-acting air
vertically and to swing about its pivot.
cylinder 28 of which the piston-rod is'adapted to advance
The gripping means is operated in synchronism with
and close a gripper assembly 29 when the cylinder is
the movement of the arm, the arrangement for unload
ing or removing pressings from a power press being such 25 energised. The form of the gripper jaws will depend on
the work to be handled.
that the gripping means is advanced to grip a pressing,
Air under pressure is delivered through flexible hoses
the arm is raised through a small distance to lift the
to the air cylinders Ztland 28 under the control of a valve
pressing, and the arm is then swung out to carry the press
or valves by which the operation of the work-handling
ing to a point where it is discharged by release of the
gripping means, the arm then returning to its initial 30 means is synchronised with that of the press.
In the normal position of the arm 14- as shown in the
drawings, the rollers 115 lie at the lower ends of the slots
The work-handling means may be set in motion auto
11 and the lever 16 is inclined downwardly at a small
matically by the closing of a switch actuated either
angle to the horizontal from its pivot to the connection
directly or through any convenient intermediate mech
anism by a cam on the crankshaft of the press or by a 35 to the arm.’
In the operation of unloading or removing pressings
striker or the like on the ram or slide, the switch being
from the press, the air cylinder 28 'is energised to advance
closed after the crankshaft has passed bottom dead
the gripper assembly and close it on to: a ?nished pressing
as’ soon as the tools have completed their operation and
A second switch is closed by a moving part of the
work-handling means as the arm approaches the upper 40 the moving tool has moved upwardly far enough to per
mit ‘the entry of the gripper. Then after a predetermined
end of its movement to release the gripping means and
allow the arm to return.
A control actuated by a part
of the gripping means may be provided to stop the press
if the gripping means is not fully retracted when an
time delay the air cylinder 20 is energised and swings the
lever‘16 upwardly about its pivot 17, and the angular
and upward movement imparted to the arm in combina
appropriate point in the cycle of operations is reached. 45 tion with the curvature of the lower end of the slots 11
Preferably the arm of the work-handling means is
produces a movement of the arm such that its lower end
carrying the gripping means is ?rst raised substantially ver
telescopic to allow its length to be adjusted to suit dif
tically through a small distance and then is swung out~
ferent presses, and it carries at its lower end gripping
‘wardly away from the press to carry the pressing out
means movable in a substantially horizontal direction and
incorporating ?xed and movable jaws between which the 50 wardly away from the tools to a point where it is released.
The path of the gripping device is shown by the lines
work is held.
31, 32 in FIGURE 3, the line 31 showing its path when
A practical form of work-handling means in accord
the telescopic arm is at its shortest length and the hori
ance with my invention for unloading work-pieces from a
zontal movement of the gripper device is at its minimum.
power press is illustrated by way of example in the
The line 32 shows the path when these are at their
accompanying drawings in which:
maximum. In each case the pick-up point is indicated at
FIGURE 1 is a side elevation of the complete work
33 and it will be seen that there is a short substantially
vertical movement of the arm to‘ lift the pressing clear of
the bottom tools before the arm begins to swing out.
FIGURE 3 is a diagram showing the path of the arm,
The dotted lines in FIGURE ‘1 show the limiting upper
FIGURE 4 is a diagram of the electrical control system. 60
positions of the lever 16 and the arm 14. These parts
1In FIGURE 1, 10 is a rigid bracket which is adapted to
handling means, .
FIGURE 2 is a front elevation,
be bolted or otherwise secured to the frame of a press to
carry the Work-handling means. The form of this bracket
will depend on the design of the press.
may be retained in that position by a bar inserted under
the lever intoa hole 34 in the plates 11 in order to hold
the arm and the gripper device out of the way for tool
Two spaced vertical plates 11 depending from the 65 setting or like operations.
The bar 26 carrying the gripper assembly will normally
bracket form a rigid frame for the work-handling means
and aligned slots 12 are formed in the plates. These
slots are vertical throughout the major part of their
length but a short part at the lower end is curved
slightly as shown at 13.
The work-handling arm 14, at a point a short distance
below its upper end, carries rollers ‘15 working in the
be substantially horizontal when the arm is in its rest
position, but the angular relationship between the bar
and the arm can be adjusted to suit particular circum
stances. For this purpose a screw-threaded rod 35 pivot
ally connected to a laterally extending arm on the lug
25 is taken through a hole in a bracket 36 ?xed on the
A 3
arm and the angular position of the lug is adjusted by
of said arm, and ?uid-pressure means operably con
nected to said lever for moving the lever angularly to
means of nuts 37 screwed on to the rod on opposite sides’
of the bracket.
cause the arm to move bodily in a vertical direction and
to swing about the axis of its pivot member.
The point in the outward movement of the arm at, which
the pressing is releasedis conveniently controlled by a
a 3‘. Work-handling means as'in claim 2 wherein said
switch 40 which is vertically adjustable on a rod 41
path de?ning means is a slot, said pivot member for the
arm being slidably guided in said slot in the frame, the
slot being vertical except for a short curved portion at
its lower endrin which the pivot lies in the normal rest
mounted in lugs on one of the plates 11, the switch being‘
tripped by the lever 16 or by the arm 14.
A convenient layout for the automatic control of the
work-handling deviceincorporating the switch 40 is shown 10
in FIGURE 4.
position of the arm.
4. Work-handling means as in claim 2 wherein said
When the crankshaft of the press haspassed bottom
dead-centre and there is su?icient room for the gripper
device to enter between the tools, a cam 45 on the crank
shaft closes a switch 46 to energise one solenoid of a
double solenoid-operated air valve 47. This admits air
to the cylinder 28 which advances and closes the gripper
device to grip the pressing. At the same time air is ad
pivot member comprises a pin ?xed transversely in the
' arm a short distance from its upper end, rollers on said
pin, and said path de?ning means comprises aligned slots
in spaced members of the frame in which said rollers
are mounted.
5. Work-handling means as in claim 2 wherein said
actuating lever is normally substantially horizontal and
mitted through a controllable restrictor valve to a pilot
the connection between the lever and the upper end of
operated master valve which, after a predetermined and 20 the arm being a pivotal one, said ?uid pressure means
adjustable time delay, admits air to the cylinder 20 which
comprising a piston and cylinder assembly, the piston
raises the arm with the gripping device and pressing and
rod of which is pivotally connected to the actuating arm
swings it outwardly. As the arm approaches the end
' at an intermediate point in its length.
of its movement the switch 48} is closed and energises the
6. Work-handling means as in claim 2 wherein the
other solenoid of the valve 47 to reverse the valve. The
energisation of the cylinder 28 is reversed so that the
pressing is released and the gripper device is retracted,
and the cylinder 20 is connected to exhaust so that the
arm returns under gravity to its rest position. A manually
dispositions of the arm, the actuating lever, and the path
in which the pivot member of the arm is guided, are such
that on energisation of the ?uid pressure means the arm
is ?rst raised bodily through a small distance to lift a
work-piece held in the gripping means clear of the tools
operated switch 48 is provided to allow the work-handling 30 of a press to which the work handling means is ?tted
device to be operated independently of'the press.
and then-the arm is rocked angularly to carry the work
FIGURE 4 also shows a safety switching arrangement
piece outwardly away from the‘ tools to a point where
incorporated in the press control circuit.
i it is released.
A switch 49 adapted to be closed by a cam 50 on the
> 7. Work-handling meansas in claim 2 wherein said
crankshaft of the press is' connected in parallel with a 35 work gripping means on the lower end of the arm com
pressure-operated switch 51 connected to and operated
prises a gripping device slidably mounted on the arm
by the air pressure in the end of the cylinder 28 to which
7 for movement thereon in a substantially horizontal di
air is admitted to retract the gripping means, so that if
rection and a double-acting ?uid pressure motor adapted
the supply of air under pressure to that end of the cy
when energised in one direction to advance the gripping
linder should fail, the switch 51 opens and the switch 49 40 device into engagement with and close it on to a work
opens and stops the press as soon as the cam 50 clears
piece and when energised in the other direction to re
the switch.
~ lease the work-piece and retract the gripping device.
‘ In an alternative arrangement a limit switch is mounted
8. Work-handling means for a power press operating
on the sleeve 27 and is adapted to be engaged by a striker
cyclically comprising a frame secured to the press, a sub
on the moving part of the gripper assembly so that the 45 stantially vertical arm, a horizontal pivot member carried
press is stopped if the gripper has not been fully retracted
by the arm and connected to the frame for substantially
when an appropriate point in the cycle is reached, whether
vertical movement relative thereto, work-gripping means
the failure is due to failure of the air supply or to any
on the lower end of said arm, an actuating ‘lever pivoted
at one end on a ?xed point on the frame and pivotally
a It will be appreciated that work-handling means forms 50' connected to the arm, ?uid pressure operating means op
a complete unit which can readily be ?tted to existing
I claim:
1. Work-handling means for power presses compris~
ing a frame, a substantially vertical arm, a horizontal
pivot member carried by the arm and connected to the
frame for substantially vertical movement relative there
to, work gripping means on the lower end of said farm,
an actuating lever pivoted at one end on a ?xed point
on the frame laterally spaced from the path of move
ment of the pivot member and pivotally connected at
the other end to the arm, and ?uid pressure means op
erably connected to said lever for moving the lever an
‘gularly in a vertical plane to swingrthe arm about the
axis of its pivot member and move it bodily in a vertical
2. Workdhandling means for powerpresses compris
ing a frame, a substantially vertical arm, a pivot mem
ber- carried by the arm, work-gripping means on the
lower end of the arm, means de?ning a ?xed vertical
path in the frame in which said pivot member is guided
for movement along said path, an actuating lever
mounted for angular movement in the frame about a
erably connected to said lever for moving the lever an
gularly in a vertical plane to swing the arm about its
pivot and move it bodily in a vertical direction, and a
control means for energizing said ?uid pressure means ac
55 tuated by a moving part of the press during each cycle
thereof to initiate an operative stroke of said arm in syn
chronism with the operation of the press.
9. Work-handling means as in claim 8 further compris
ing double acting ?uid pressure means connected for ac
60 tuating said work gripping means, a solenoid-operated
valve means operable to energize said double-acting ?uid
pressure means in one direction to grip a work piece and
subsequently, after a predetermined time interval, energize
65 the ?uid pressure means for moving the arm, said control
means including a ?rst switch actuated by a moving part
of the press for controlling said valve to cause the grip
ping of a work-piece and the movement of the arm on
an operative stroke of the press, and a second switch ac
70 tuated by the arm for reversing the valve to cause the
release of the work-piece and the retu-rnpof the arm.
10. Work-handling means as de?ned in claim 8 further
comprising press control means including means for-stop
ping the press upon failure of said double acting ?uid
?xed horizontal pivot laterally spaced 'from the path, a
pivotal connection between the lever and the upper end 75 pressure means, and means for rendering said last men~
1 cycle of press operation.
11. Work-handling means for a power press or the like
comprising an arm of substantial length having vwork grip
ping means at one end, a frame, mounting means for
pivotally mounting the arm on the frame for swinging
movement about a ?rst pivotal axis extending transversely
of the length of said arm, said mounting means permit
ting also movement of said ?rst pivotal axis along a pre~
determined path, a lever pivoted to said arm on a second 10
pivotal aXis' parallel to said ?rst pivotal axis but spaced
therefrom, means engaging said lever at point spaced
from said second pivotal axis for guiding the path of
movement of the lever, and ?uid pressure means con
nected to the lever to move it along its path of move
ment and thereby to move said arm.
References Cited in the ?le of this patent
=tioned means operative at a predetermined point in the i
Tompkins ____________ __ Aug. 8, 1905
Grant et al. __________ __ Aug. 31, 1926
Can?eld _____________ .. May 24, 1932
'Sahlin _______ _..- _____ _._. Mar. 10, 1942
Sahlin ____ __; __________ __ Sept. 9, 1952
Sahlin _______________ __ Sept. 18, 1956 ~
Sehn et a1 _____________ __ Feb. 12, 1957
Udal _________________ _._ Oct. 29, 1957
Loisell _______________ __ Jan. 13, 1959
“Sahlin Iron Hand Unloading Machines,” Sahlin En
gineering Co., PO. Box 289, Birmingham, Michigan, pp.
Sand 8.
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