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Патент USA US2127820

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Aug. 23; 1938.
' Filed Aug. 'r, 1956
. v
2 Sheets-‘Sheet 1
v afar/7e: [1T ‘(wok/beget
Aug. 23,1938, ‘
Filed Aug. '1, 1936’
, 2 Sheets-Sheet 2 '
4@ i)‘ I. a
I pt’.
‘Patented Aug.‘ 23,
' ‘2,127,820
.. 2,121,820
'amnxmo AND FORMING raass
James H. Kindelberger,v Inglewood, Calli'., al
signor to North American ‘Aviation Corpora
tion, Inglewood, Call!” a, corporation of Dela
,7 Application August 7. 1936, Serial No. 94,799
(Cl. 164-28)
" This invention relates to a blanking and form
grooved to accommodate the antifrictionl rollers
ing press especially adapted to the blanking and/ [3“, A table I‘ is provided with grooved ways I!
or the forming of irregular shapes made from _ and it for engagingv rollers ll andlthereby vpro
sheet metal.
viding an antifri'ction reciprocatory mounting for
It is one of the principal objects of this inven
tion to devise a_ blanking ‘and a forming press
of relatively simple and rugged construction
the table.
A power cylinder 11 is provided for _ 5-. I
driving the table back and forth. The cylinder
atone end maybe directly bolted to the frame
which will operate rapidly and easily to blank out _‘ while at its opposite end may be provided with a
and/or form irregular shapes from sheet alumi
head is having a common form of stuffing box
10 num; alloys thereof, or other materials, and in I9 through which the piston rod 20 operates.
‘which the male portion of. the blanking and/or
It will be understood that the piston rod carries
forming die is opposed by a resilient member pref ' upon its inner end'a piston forming a fluid seal
erably of rubber.
with the cylindervbore in the usual manner. The
A further object is to arrange the machine - outer end of piston rod 20 is connected to the
15 so that the blanking and/or forming \operation' table as by .means of a wristpin 2 l' which extends 15
, will be progressively performed.
through the enlarged end of. the rod and the
, Other objects and advantages of the invention
will become apparent as the nature of the same‘.
is more fully understood from the, following de
20 scription'and accompanying'drawings wherein is
set forth what is now considered to be a preferred
embodiment“ It should be understood, however,
that this particular embodiment of the invention
bifurcated bracket 22 preferably formed integral
with-the table.
The, table is reclprocated 1by the cylinder by v
supplying thereto hydraulic ‘pressure through onev 20
or the other of pipes 23 and 24.
The valve
mechanism, for controllingthe supply of pressure
?uid to one or the other of said pipes while open
is chosen principally for the purpose of exempli- \ ing the opposite pipe to atmospheric pressure has
; 25 ?cation and that variations therefrom in details not been shown as there are a great many con- 25
of construction or arrangement of "parts may trol valvesron the ‘market suitable for this pur
accordingly be effected and yet remain within the
spirit and scope of the invention as-the same is
set forth in the appended claims.
Inthe drawings: ‘1
ing surface, that is a surface to which any one or
more of a number of‘ blanking dies 25 may be 30‘ '
securely mounted as by means of cap screws 26..
Figure 1 illustrates a side elevational view par
‘ tialiy in section to more clearly show some of the
operating details of the machine.
Figure 2rillustrates a plan view of atypical
35 blanking die.
‘Figure 3 illustrates a sectional view taken‘ sub
stantially in the plane ‘of line/ 3-3‘ of Fig. 1. ,
_ Figured illustrates a fragments! sectional view
The top surface of table It comprises a work-\
A plan view' of one blanking die is shown in Fig
ure 2, wherein the contour of the die is clearly
shown. It will be'understood thatdies of other
. " contours may be readlliy substituted for the par- 35
'ticular die shown.
Opposed to theltab'le is a pressure‘ roller 21’
carrying a resilient member28. The resilient
‘ taken substantially in the plane of line 4-4 of
memberma'ybe mounted upon the roller in the
Figure 5 illustrates a fragmental view partially
therearound, as shown in Figures 1, 3 and 5. In
these last~figures the resilient member is in the
140 Fig. 1.
in section of'the resilient member as it’would
appear during a blanking operation.
form of an endless belt plying between the ‘roller
and an adjustable idler pulley 29. The roller is
resilient member.)
_ journaled to the'free end of a cradle 30 (Figures 45 a
. Figure 7 illustrates one specific type of forming 1 and 3) as by means of shaft 3|. 'The cradle is
Figure 6 illustrates a modi?ed form of the
Fig. 8 illustrates a section taken‘ substantially
in the plane VIII--VIII of Fig. 7.
manner of a tire, as shown in Figure 6, or belted 40 K
pivotally mounted upon the machine framev by _ >
means of pivot shaft 32. That pertion ofyithe' ‘
‘ - cradle which supports the pressure roller is pref
In its preferred form, theinvention illustrated . erably bifurcated toprovide supporting bearings 5.0x‘
in Figures 1 to 5, inclusive; may include a frame ' 33 upon opposite ends of the pressure roller shaft
' iii of appropriate form to support theseveral ele- , 3|. The idler roller 29 is adjhstably mounted in
ments of the machine. As may be observed in the cradle, as is clearly shown in Figures 1 and 3
Figures 1, 3 and 4 the frame may be provided with - wherein the opposite sides of the bifurcated por- '
“a pair of spaced ways ii .and 12, preferably tipn of the'cradleareslotted asst 14 to receive 65 >
the square bearing blocks 35 and adjusting screws
88 screw-threaded through lugs 31, acting to
properly position the idler pulley with‘ relation to.
the pressure roller whereby the resilient member
2' may be tensioned to a desired degree. This
' feature also provides su?lcient slack in the resili
ent member to facilitate mounting of the roller,
pulley and resilient member in the cradle. It is
preferable to provide at least the pressure roller
In this vfigure it will be noted that the forward
end of the material has been sheared down over
the die. They table need “not be stopped while
bringing the resilient member into shearing re
lation with the die and as a result the die and
surface of the resilient member. will roll in pres
sure contact,‘ whereby the shearing action will
progressively travel from one end of the die to the
other. Upon completion of the blanking opera-v
i0 with side flanges 38 to limit the de?ection of the _ tion the blanked piece of metal, together with 10
resilient member during the blanking operation.
the portion trimmed therefrom, may be removed
Means are provided for controlling the posi
tion of the cradle and thereby the position of the
resilient member with relation to the top surface
of the blanking die to thereby control the shear
ing action of the resilient member against the
from the die and another piece of material placed
upon the die and during the return stroke of the
cutting edges of the die.
table the blanking operation repeated.
By providing rollers 5| adjacent each side of' 15
the pressure roller for holding the material upon
This means is prefer- , the dieiduring the initial engagement of the re
ably in the form of a hydraulic cylinder 40 which
at its upper end is pivotally connected to the
20 upper end of the frame as by means of pivot
shaft CI. The frame at this point is bifurcated to
silient member therewith, the cradle may be
provide a bearing at each side of the cylinder. , A
cylinder head 42, having the usual stumng box
48, is bolted to the lower end of the cylinder and
25 a piston rod 44 carrying a'plston within the
maintained in adjusted position and the table
reciprocated back and forth completing a blank 20
ing operation for each stroke thereof.
From the above description, it will be appreci
ated that the machine operates easily and quickly
to perform the blanking operation‘.
cylinder, not shown, extends through the stu?ing
The progressive blanking action is one of the 25
important features of the invention as it greatly
box and at its lower end is pivotally connected
to the free end of the cradle by the pivot pin
reduces the pressure or thrust necessary to com
plete a blanking operation. Heretofore it has
Pressure lines 46 and I‘! connect the opposite _ been the practice to use a relatively large power- -
30 ends of the cylinder to a hydraulic control valve,
not shown, whereby the position of the cradle
ful, and as a result, slow-acting hydraulic press 30
for this purpose. VWhen using the usual hydraulic
may be elevated or lowered to suit the desired
press a die is placed upon the press anvil, ma
operating condition.
terial to be blanked placed upon the die, a block
of rubber placed upon vthe material, whereupon
the rubber block is forced down upon the ma
In some cases it may be desirable to me
chanically drive the pressure roller during the
blanking operation.
This feature may or may
terial by the ram of the press until sufficient
pressure has been exerted upon the rubber block
not be made use of and in some instances it may
be entirely eliminated. The means for driving. to suddenly bring about the complete shearing
the pressure roller herein shown includes provid
of the surplus material around the die. By this
40 ing table I! with a rack 46 and from this ele
method the material around the entire contour 40
ment driving the roller'through a train of gears. of the die is severed at the same instant, thus
The gear train may include a driving gear 41
requiring great pressure and as the material gives
journaled upon the cradle pivot shaft 32 which way more or less suddenly, causing the press to
not only meshes with the rack but also with an jump in a more or less destructive‘ manner.
45 idler gear 4' Journaled upon the cradle by means
Contrasting the hydraulic press method with
of shaft 49. The idler gear in turn meshes with that of this invention, it is found that a relatively 45
a driven gear I0 ?xedly mounted upon the pres
small "amount of pressure is necessary to cause
sure roller shaft II. As the pressure roller is
?xedly-mounted upon this same shaft the rotation the material 'to' shear at one point or location .
of the gears will cause a rotation of the roller. of the die, and thereafter even less pressure is 50V
It should be noted that the gearing is so arranged needed to carry on the shearing operation as it
progresses from one end of the die to the other.
and proportioned as to cause the roller and there
by the resilient member to rotate in the same There is no destructive ,‘Iarringv of the machine,’
direction and at substantially the same surface and a very much smaller and less heavily built
speed as the surface of the die to which ‘it isv machine, operating much more rapidly, will per
The rollers 5| may be mounted upon the cradle,‘
in the manner shown in Figure 1. These rollers
either direction will cause a corresponding rota
may or may not be used, this depending upon the
tion of ‘the resilient member carried by the roller
and that the surface speed of the resilient meni
ber will always correspond to the speed of the
,type of work and manner of operating the ma- 60
v chine.
The machine of this invention may be used as
a forming press, that is, instead of shearing the
surplus material from the blank'around the die,
The machine may be operated in the follow
ing manner: With the table retracted as shown. the die 0, (Figs. 7 and 8) may be of the forming 65
in Figure l. and a blanking die mounted‘ thereon, type, that is, the die may have depressions Si or
a sheet of aluminum or other material'may be other configurations into which the material un
placed upon the die. Next, by means of cylinder der treatment will be forced by the pressure roller
,40, the resilient member may be raised above the as the die with its material is moved thereunder.
material‘ and then the table advanced by means The machine is capable of many other uses as 70
of cylinder l'l until the forward edge of the die will be appreciated by those skilled in this art. _
form theblanking operation.
opposed during the movement of the die. 'As
the pressure roller is driven'directly from the
table, it follows that movement oi’ the table in
lies substantially under the pressure roller where
upon the cradle can be forced downwardly by
means of cylinder 40 until the resilient member
76 assumes a position similar to that of Figure 5.
Having fully described the invention, it is to be
understood that it is not limited to the details
herein set forth, but the invention is of the full
scope of the appended claims.
I claim:
i. In a progressive pressing device, a frame, a
die supporting table reciprocally mounted upon
said frame, means for reciprocating the table, a
cradle pivotally mounted at one end to said frame,
a pressure roller journaled in said cradle in spaced
relation to the cradle pivot, an idler roller jour
naled in the cradle, a resilient pressing member
belted around the pressure and idler rollers, a
10 driving rack carried by the table, gear means
journaled upon the ‘pivotal center of said cradle
mounting and engaging said rack, driving means
between said gear and pressure roller, and means
2. In a progressive pressing device, a, frame, a
die supporting table reciprocally mounted upon
said frame, means for reciprocating the table, a
cradle pivotaliy mounted at one end to said frame,
a pressure roller having a resilient tread journaled
in said cradle in spaced relation to the cradle
pivot, a driving rack carried by the table,‘ gear
means‘ journaled upon the pivotal center of said
cradle mounting and meshing with the rack,
driving means between said gear and pressure 10'
roller, and means for controlling the movement of
th; free end of the cradle toward or from the
ta le.
for controlling the movement of the free end of
15 the cradle toward or from the table.
JAMES H, mmannom. ' 15
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