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Патент USA US3029687

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April 17, 1962
3,029,676
J. RABINOW
PUNCH PRESS HAVING MAGNETIC REACTIVE FORCES
Filed May 12, 1960
Fla. /
m).
F7612
50
INVENTOR
Jacob Rab/now
ATTORNEY
3,d29,67ii
Patented Apr. .17, 1962
2
-
3,029,676
PUNCH PRE§S HAVING MAGNETIC
REACTIVE FORCE§
Jacob Rahinow, Taltoma Park, Md, assignor to Rahinow
Engineering Co., Inc., Rockville, Md.
Filed May 12, 1960, Ser. No. 28,721
7 Claims. (Cl. 83-382)
when viewed from the side, and it has a deep throat 24
to receive comparatively large area work pieces W.
Electromagnets 26 and 28 are secured to the frame
members 16 and 18, and they are spaced from each other
5 to form a ?ux gap 3%.
Tool holder 32 is conventional,
and it is secured to the piston of a tool holder actuation
cylinder 34 located between the two poles of electromag
net 26. Cylinder 34 is secured to the bearing plate 22.
This invention relates to presses and more particularly '
Plate 36 is adjustably attached to bearing plate 22 and
to presses for large area Work pieces.
10 the means for achieving this may vary. I have illus
Deep throat presses, for instance punch presses, must
trated two screws 38 and 49 in tapped openings in hear
be made structurally heavy in order to withstand reactive
ing plate 22 and swivally connected to plate 36, however
press loading. Such presses in current industrial and
it will become at once evident that the screws may be
commercial use have exceedingly heavy frames. As a
substituted by a single positioning hydraulic cylinder or
result, they are expensive and comparatively difficult to
a plurality of hydraulic cylinders, pneumatic cylinders,
move.
An object of my invention is to make it possible to
construct a comparatively lightweight punch press with
a deep unobstructed throat. This is accomplished by the
etc. where high speed operation is desirable.
The lower electromagnct 28 has two pole pieces direct
ly opposing the pole pieces of electromagnet 26, and a
?ux return plate 42 whose function is similar to plate
inclusion‘ of means, preferably located in the region of 20 36. The die or die holder 44 is disposed between the
the tool holder of the punch press, for magnetically trans
pole pieces of the lower electromagnet 28, and like tool
mitting reactive press forces between the upper and lower
part of the throat. The effect is an electromagnetic clamp
which prevents spreading of the throat.
holder 32, is conventional.
as the frame of the press. Essentially the only function
source of electrical potential and connected by wiring to
the coils of the electromagnet 26 and 28 respectively.
FIGURE 2 shows a conventional source 46 of ?uid
under pressure, for example air or liquid, and a control
Although the design of different manufacturers’ makes 25 valve 48 connected to source 46 by way of conduits 50.
of presses varies somewhat, the frames of all presses, to
Valve 48 is a three-way valve, however the actual hy
my knowledge, are made su?‘iciently strong to withstand
draulic circuit is not considered to be critical. Conduits
press reactive forces within a given parameter. My in
52 and 54 extend from valve 48 to cylinder 34 in order
vention deviates from accepted design practices by. using
to raise and lower the tool holder 32 in response to
a lightweight frame in place of the usual heavy casting, 30 operation of valve 43. Switch 56 is connected to a
of the top part of the frame of my press is to support
and align the tool holder, and to serve as a portion of the
There are means interlocking valve 48 and and switch
means for establishing a favorable flux path between the
56 for simultaneous'operation, and these means may be
base of the frame and the upper part of the frame. These 35 represented by a single lever 58 mounted on a pivot and
means ‘may take the form of an electromagnet and a
pivotally connected to the valve and switch actuators. In
highly permeable metal member.
the forms of my invention using one or more cylinders
Although the principles of the invention are very Well
instead of screws 33 and 4%}, the additional cylinder or
compatible with a number of different types of presses
cylinders control valve assembly may also be interlocked
such as for metal bending, metal punching presses and 40 with lever 58 or may be separately controlled, as desired.
others, the subsequent description deals only with punch
Also, the force between magnets 26 and 28 may be used
presses since such presses represent one preferred area
to punch work piece W, in which case the cylinder 34
of use of the invention. It is to be clearly understood
and its control 48 may be omitted in favor of a tool holder
that the illustrated form of the invention is given by
secured to plate 22 or the upper magnet.
way of example only.
45
Optimum ?ux path properties are established by the
Other objectives, features and advantages of this in
width of the gap between pole pieces of the electro
vention will become evident in following the description
magnets 26 and 28, the permeability of the metal thereof
of the illustrated form of the invention.
including plates 36 and 42, and the operating current
FIGURE 1 is a diagrammatic side elevationalview of
energizing the coils. High magnetic attraction across
50 the throat of press 10 is obtainable by using upper and
a press constructed in accordance with the invention.
FIGURE 2 is a diagrammatic front elevational view
lower electromagnets. In those instances where the
highest magnetic attraction is not necessary and where
of the press in FIGURE 1, the controls for the press
economy is important, two of the coils, for instance the
being only schematically represented.
In the accompanying drawing, I have shown press 10 55 coils of electromagnet 26, may be omitted so that the re
mounted on a suitable support such as table 12.
Press
10 is intended to replace heavy industrial presses or com
mercial presses which are ordinarily found in machine
shops, manufacturing plants, etc. However, the invention
may also be applied to hobbiests presses or may take the
form of an attachment for an ordinary, conventional
maining cores and plate 3d function as a flux return for
electromagnet 28.
my invention.
Other variations are contemplated by
For instance, the invention may be em
bodied as an attachment composed of one or more elec
tromagnets attached to an otherwise conventional press
across the throat thereof and this will have the effect of
increasing the useful force capacity of the conventional
press in order to increase the tolerable loading of the
press. Permanent magnets may, also, be employed with
frame of the press.
?ux shunting arrangements used to energize or reduce
Press frame 14 has a ?rst, upper frame member 16
the flux in the working gap as is done in magnetic
and a lower, second frame member 18 joined together 65 clutches. These are well known and need not be de
at their inner ends by frame member 20. The upper
scribed here.
frame member 16 is in the form of a simple truss with
Other modi?cations as fall within the scope of the
a bearing plate 22 at the outer end. Frame member 20
following claims, may be resorted to without departing
may be a post or simply a U-shaped member (FIGURE
from the protection afforded by the claims.
2) secured at its lower end to frame member 18 shown 70
I claim:
as a ?at bed plate. Frame 14 is essentially C-shaped
1. A press comprising a rigid frame having a rear
enaaeve
3
4
frame member, upper frame member stationarily ?xed to
reactive forces between said base and said mechanical
.
"
said rear frame member, and a lower frame member sta
tionarily ?xed to said rear frame member, said frame be
means.
‘
ing incapable of sufficiently and effectively resisting a
5. The press of claim 4 wherein said electromagnets
constitute a work piece clamp; and interlocked means for
given reactive press force applied in a direction tending
to spread said upper and lower members, said upper and
lower frame members de?ning a deep throat, tool actuat—
operating said device and energizing said electromagnets.
6. A deep throat, lightweight press comprising a tool
actuating device, a rigid frame having a back member,
an upper member and a lower member ?xedly secured
ing means reacting on said upper and lower frame mem
to said back member and supporting said device, said
bers to function on a work piece in said throat, and
magnetic means spaced from said rear frame member and 10 upper and lower members de?ning a throat and being
structurally incapable of preventing the throat from ex
operatively connected with said upper and lower frame
cessive spreading under a given maximum loading of said
members and providing a reaction for said force to pre
vent spreading of said throat when said tool actuating ' frame or otherwise structurally failing, and magnetic
means are operative on a work piece and generate a
force equal to said given reactive press force.
means spaced from said back member and operatively
15 connected with said upper and lower frame members but
eaving said throat completely open and transmitting
2. The press of claim 1 and control means interlocked
with said tool actuating means for energizing said mag
press forces between top and bottom of said throat to
prevent said spreading under the same given maximum
netic means.
loading of said frame.
7. An attachment fora press to increase the useful
working force parameter of the press and wherein the
press has a rigid frame provided with ?xedly connected
3. The press of claim 2 wherein said magnetic means
include an electromagnet, and means adjustabiy securing
said electromagnet to one of said frame members.
4. A punch press comprising a tool holder and operat
ing device; a ?rst electromagnet; a second electromagnet
frame members de?ning a throat, said attachment com
prising electromagnetic means connected with said frame
opposing said ?rst electromagnet; said electromagnets hav 25 members' de?ning said throat for establishing a closed loop
?ux path across said throat to resist spreading the frame
ing opposite poles facing each other and having a flux
gap therebetween, the space between opposing poles form
members under press loading by transferring press forces
between the frame members, and means to control the
ing a work piece receiving station; means to energize said
energization of said electromagnetic means.
electromagnets; a base against which said device reacts
and to which said second electromagnet is secured; and 30
References Cited in the ?le of this patent
rigid mechanical means against which said device reacts;
UNITED STATES PATENTS
said 'mechanical means being structurally incapable of
resisting normal reactive press forces generated by said
1,546,330
Ullrich ______ __, _____ __ July 14, 1925
holder and operating device without exceeding the elastic 35
limit of said mechanical means or otherwise excessively
spreading, to support said ?rst electromagnet in opposing
relation to said second electromagnet, whereby the mag
netic attraction between electromagnets transmits press
1,561,063
Dunlap __..__. _
1,699,247‘
Oliver ____ __________ __.'_ Jan. 15, 1929
_ _ _ _ _ __ Nov. 10, 1925
2,536,709
Ashton _,. ____ ___ _______ __ Jan. 2, 1951
2,585,893
Young ___, ___________ __ Feb. 12, 1952
2,914,981
Roeber _________ _.."____._ Dec. 1, 1959
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