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Патент USA US3078916

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Feb. 26, 1963
F. J. FUCHS, JR.. ETAL
'
MACHINE FOR FLANGING TUBULAR MEMBERS
Filed May 2'7, 1960
3,078,905
6 Sheets-Sheet 1
JNVENTORS
FJ. FUCHS JR
H R. T/LLMAN
4 Feb. 26, 1963
F. J. FUCHS, JR.. ETAL
MACHINE FOR FLANGING TUBULAR MEMBERS
3,078,906
Feb. 25, 1963
3,078,906
F. J. FUCHS, JR., ETAL
MACHINE FOR FLANGING TUBULAR MEMBERS
Filed May 27, 1960
m
6 Sheets-Sheet 3
62
34
Feb. 26, 1963
3,078,906
F. J. FUCHS, JR., ETAL
MACHINE FOR FLANGING TUBULAR MEMBERS
Filed May 27, 1960
6 Sheets-Sheet 4
INVENTORS
BY
F J. FUCHS JR.
H R. TlLLMAN
ATTORNEY
Feb. 26, 1963
F. J. FUCHS, JR.. ETAL
'
3,078,906
MACHINE FOR FLANGING TUBULAR MEMBERS
Filed May 27, 1960
e Sheets-‘Sheet 5
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INVENTORS
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H R. T/LLMAN
Feb. 26, 1963
3,078,906
F. J. FUCHS, JR.. ETAL'
MACHINE FOR FLANGING TUBULAR MEMBERS
Filed May 27, 1960
6 Sheets-Sheet 6
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INVENTORS
FJ FUCHS JR.
BY
H R. T/LLMA/V
léz’weeu.
ATTORNEY
3,978,905
United States Patent
Patented Feb. 26, 1963
2
1
assembly, a punch indexing assembly, ram assembly and
34978906
a control system. A work piece is held in a work position
MACHINE FOR FLANGENG TUBULAR MEMBERS
‘between stationary and movable clamp elements of the
Francis J. Fuchs, in, and Henry R. Tillman, Winston
Salem, N.€., assignors to Western Electric (Jompany,
gripping assembly. Cam surfaces on a pair of cam bars
engage cam followers on a die plate having dies mounted
therein. The cam bars carry the die plate and dies to
position a ?rst of the dies over one end of the work piece
so that the positioned die can receive a punch to upset
the end of the workpiece. A punch on a rotary punch
gicoggporated, New York, N.‘iZ., a corporation of New
or
Filed May 27, 1960, Ser. No. 32,353
14 Claims. (Cl. 153—30.5)
The invention relates to a machine for ?anging tubular
members and more particularly to an indexable ?anging
holder is inserted within and withdrawn from the posi
tioned die by the ram assembly. Withdrawal of the
machine for successively and progressively upsetting an
punch actuates a switch in a control system to begin rota
the use of wave guide sections manufactured within
subsequent punch is rotated into alignment with the
work piece and die, and the machine is then ready to
tion of the rotary punch holder which in turn closes an
end of a wave guide.
other switch to begin operation of the die indexing assem
The successful use of wave guides for transmission of 15
bly. A second die is positioned over the Work piece, a
microwave energy is dependent to a great extent upon
tolerances which closely approximate the theoretically
ideal Wave guide.
begin another punching operation.
Other objects and advantages of the invention will
The utilization of wave guides in a ‘system necessitates 20
become apparent by reference to the following detailed
the connection of a great number of Wave guide sections
description when considered in conjunction with the
for construction of transmission towers or lines, the re
accompanying drawings wherein:
‘
placement of defective sections, and the insertion of
auxiliary equipment for transmission control at various
FIG. 1 is a perspective view of a ?anging machine em
locations. Additionally, as the wave guide lines may be 25 bodying the principles of the present invention, wherein
a portion is cutout to disclose various working components
?lled with a gas such as nitrogen to protect the interior
therein;
from corrosion, or to minimize breakdowns at high volt
FIG. 2 is a partially cut-away side view showing an
ages, it is necessary to have a sealed joint, and for elec
indexable punch, ram head, and ram toggle assembly
trical reasons, the joint must mate nearly perfectly around
together with appropriate connections to the chassis of
the inner perimeter of the tubing to prevent electrical
distortion.
‘it has been the practice in the past to utilize tubular
Wave guide members to which a ?ange was brazed, but this
the machine;
'
FIG. 3 is a fragmentary view, partially in section, of
the machine shown in FIG. 1 disclosing the clamp toggle
and jaws, a clamp stop cylinder assembly and a work
resulted in an annealing and loss of strength plus a cer
piece positioned within the die plate between the clamp
tain amount of distortion due to warpage from the brazing 35
jaws;
heat. Also, it was found that since the cross-section of
FIG. 4 is a sectional view taken along line 4-4- of FIG.
a Wave guide is a critical dimension, the excess material
3 disclosing the face of the die plate together with a pair
deposits and warpage resulting from brazing required
of cam bars and die indexing cylinders;
time-consuming ?ling and sizing before the wave guide
FIG. 5 is a front view of one of the cam bars showing
sections could be successfully assembled. Also, in in 40 various
cam surfaces which engage a die plate cam fol:
stances where threads were provided to join sections, it
lower to index a die plate plus a guide channel for a
was found that the threads weakened the tube, and further
that it is very expensive to form threads of the required
clamp jaw;
precision.
closing four punch positions and a punch holder indexing
FIG. 6 shows a front view of the punch holder dis
The present invention overcomes the difficulties of wave 45
gear;
guide manufacture by utilizing a cold ?anging process to
FIG. 7 is a fragmentary view showing the face of the
form a ?ange on a wave guide section.
die
plate together with one of the cam bars;
'It is the object of the present invention to provide an
FIG. 8 is a sectional view taken along line 8--8 of
improved and new apparatus for placing a ?ange on a
FIG. 4 showing the die plate, gripping jaws and posi
50
tubular member.
tioned
workpiece;
Another object of the invention is to provide an auto
FIG. 9 is a schematic of a hydraulic system in con
matic, hydraulically-operated apparatus for successively
junction with electrical control elements for operating the
and progressively upsetting an end of a tubular member
?anging machine;
to produce a stronger, more uniform ?ange on the tubular
FIG. 10 is an electrical circuit utilized to control the
55
member.
operation of the ?anging machine shown in the other
It is a further object of the invention to provide an
views; and
automatic ?anging apparatus which utilizes an indexable
FIG. 11 is a mechanical schematic diagram illustrat
punch head which facilitates the use of a plurality of
punches for progressively upsetting the end of a tubular
work piece in distinct stages to produce a stronger more
uniform flange on the member.
It is another object of the invention to provide appara
tus utilizing an indexable die plate which successively posi
tions dies to facilitate the progressive upsetting of the end
ing the physical relationship between various micro
switches, cam surfaces, and principal machine elements.
Referring now to ‘FIG. 1, the ?anging machine com
prises a box-like chassis 21 for containing the various
elements of the machine. Pedestal-like projections 22 of
the chassis are adapted to mount the machine on a suit
able foundation. A yoke 23 is securely attached to the
of a tubular work piece to place a ?ange thereon.
It is a further object of this invention to provide an
chassis and acts as a mount upon which additional ele
electrically controlled, hydraulically operated, automatic
ments ‘are mounted.
?anging machine utilizing indexable punches and dies
A work clamp including clamp jaws designated by the
numbers 24 and 25, see FIGS. 1 and 3, is adapted to
distinct stages.
70 grip a work piece such as a tubular member 32 and
restrain the member against horizontal and vertical move
A machine embodying certain aspects of this invention
ment during a subsequent ?anging operation. The sta
may include a workpiece gripping assembly, a die indexing
for progressively placing a ?ange on ‘a tubular member in
apropos
‘
-
4
a
tionary jaw 24 of the work clamp is secured to the yoke
23. The movable jaw 25 of the clamp is attached to a
the work piece is ‘forced against the stationary jaw 24,
thus securing the workpiece 32 against movement.
clamp toggle 26 and is guided in vertical straight channels
or guideway 49 formed in cam bars 27, see FIG. 5. The
In a preferred embodiment of the machine, the clamp
ing operation takes place in two distinct steps. First,
clamp toggle 26 is operated by a hydraulic cylinder and
piston '28 which is pivotally secured to the machine chas
there is a clamping motion which secures the work piece
between ‘the clamp‘jaws 24 and 25 under a slight amount
of pressure and, secondly, there is ‘the phase duringwhich
the workpiece 32 is clamped, with a greater pressure.
sis by trunnion's 29. A clamp toggle stop in the form
ofa second hydraulic cylinder and piston ‘31 is secured
to the ‘housing 30 of the clamp cylinder 28 and is posi
tioned to oppose the‘ clamping motion of clamp piston
2821. As the clamp toggle cylinder and piston 2.8fbe‘gins
to move the clamp toggle 26 in the clamping stoke, the
movable clamp ‘element 25 is forced upwardly in a verti
cal'plane to engage the tubular workpiece 32 and force
the ‘work piece against the ‘stationary clamp jaw 24.
This two-phase clamping is desirable in a case where the
10 ?nal clamping pressure necessary to secure the work
piece for a particular type of punching operation is so
great that it may crush the sides of a tubular work piece.
In order to prevent collapse of the walls of a‘tubular
work piece, insertion of amandrel ‘into the workpiece
to support the walls is necessary. Insertion of the man
drel is ef?ciently accomplished if thework pieceis ?rst
‘In order to ‘selectively align dies 53 and 54 with work
piece 32, cam ‘surfaces on two cam bars 27 are forced
secured against movement‘byaslight ‘clamping pressure.
into engagement with a die plate .35 by indexing pistons
and cylinders 33. In a ?rst of two work positions, "as
disclosed in ‘FIGS; 1 and 4; pistons 33a ‘force cam bars‘ 20
27 upwardly to hold the die plate 35 in an uppermost
position and to align die 54 with work piece 32. After
preliminary upsetting of workpiece 32 has been com
pleted, utilizing die 54, die 53 is moved into alignment
with the work piece. "Pistons 33a are operated to pull
thefclamp toggle "stop cylinder and piston 31_is‘ provided
to oppose the operating motion of ‘the‘clarnp piston 284.
During the time ‘thatgfluid is ‘being forced into clamp cylin
ders 2810 operate, the clamp toggle 26 in th'eclamping
phase, ?uid is also being forced ‘ipto stop cylinder 3.1‘. The
cam bars '27 downwardly in‘ the vertical plane. Cam
surfaces 62 of ‘cam bars 27 engage'cam followers 34- on
the die plate 35 to facilitate downward movement of die
force. exerted by the clamp piston 28:; overcomes‘the
opposing‘ forcefof, the stop cylinder ‘and piston 31 until
plate 35, consequently, die ‘53 is moved into alignment
was work piece 32.
30
e
‘ L .hydranlic cylinderiioiis pivotally attached to the ‘ma
After workpiece 32 ‘is gripped by clamp 25, with die
pl‘ate'i35poisitioned to align die 54 with the work piece,
the hydraulic piston 36a operates the ram toggle and the
tram.v head 39 toforce a‘ punch 43 ‘into working engage
ment with the work piece 32. After the punching opera
tion is ‘completed, the piston 36a is: reversed and ‘the ram
head‘39 is returned to ‘an unoperatiye‘position illustrated
in
‘1.7 Reversal of the ramhead 39 results in closure
of switch L812 ‘which initiates indexing of aro'tja'rypun'ch
2821', ‘the “stop cylinder and piston 31 will be momentarily
effective to stopgfurhther motion of the clamp ‘ jaw 25 by
35
32., After the tn’ornen‘t'ary‘fSwp and in response to closure
' ofy'switch L510, solenoid S63, "see FIG. 9,. is energized
and a presshreredu'ccr 95 and stop ‘cylinder 31 are‘ simul
40 taneously 'iswit‘ched out ‘of ‘the hydraulic‘circnit. , Closure
of LSIQ alsolcompletes a circuit‘for ‘solenoid ‘S_‘7B‘_whic_h
functions to ‘shift valve S7 ‘to connect a pressure respon
45
initiates the operation ofthe die plate indexing ‘assembly
_ _
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50
clamping assembly of the ‘?angin‘g machine is
best illustrated in FIG. 3. Stationary clamp jaw 24 is
attached to ?xed‘ yoke 23. of the machine and is provided
with‘a gripping surface that is ‘shaped and suitably grooved
to accept and secure the work piece 32 against movement. 55
Guide pins 44 are rigidly attachedto the stationary clamp
jaw‘ and are adapted to ride within guide apertures 45
alignment with, the work piece 32 through “the "cooperation
of die plate 35, cam ‘bars 27 and indexing cylinders and
}
mfI‘he indexingcylinders33 are rigidly fastened ‘to the
chassis 21 and the. pistons 33a ‘are connected to “two cam
60
bars 27 as disclosedcin FIGS. 1 and 4. These ?gures show
the cam lbars 27and the die plate ‘35 in the ?rst indexed
position sonthat die 54} is ‘in position over ‘a work piece
32. The cam bars 27 are guided to move in the vertical
nected ‘to the machine chassis by a pivot ‘shaft 47. A
plane by_dove tail ‘grooves formed in the chassis which
link'48 of the clamp toggle 26 is pivotally connected to
the ‘movable clamp jaw 25. When ‘?uid is forced into
MTheE‘machine performsseveral hanging and punching
operations on the work piece
in ‘order to accomplish
these operations'the die plate 35 containing two‘ cli?‘erent
dies 53 -and.54,, see, FIG. 7,“ is indexed to ‘one of ‘two
positions. The dies 53 and 54am selectively carried into
pistons 33.
formed in the die plate 35, see FIG. 8. These guide pins
44_insure that the die plate 35 is correctly positioned
with respect to the work piece 32. Theclarnp piston
and cylinder 28 is attached to and operates the clamp
toggle 26. A link 46 of the toggle 26 is pivotally con
33. The clamp piston 28a and toggle 26 will then force
be carried out on thefwork piece
Following ‘is a'more detailed description of the various
units of: the vhanging machine.
sive sequence valve 99in thephyd'raulic system. The
sequence ‘valve 99 controlscthe application of highpres
sure "to the clamp cylinder 28 and the index cylinders
jaw 25. into ?nal clamping,v engagement with‘ thlelwork
pieces: which time the punching operation is ready to
and‘ ‘die '53 is aligned with work piece 32 in preparation
~for subsequent punching operations.
clamp ‘piston 28a. Duringfthe momentary stop, a
mandrel :52, see FIG._42,’is inserted into‘the work piece
holder '41 to bring a subsequent punch into alignment
with-the workpiece 32. Indexing of punch holder ‘41
a'predete’rniinedclamping pressure is exerted on the work
piece.‘ , When this predetermined, clamping pressure‘ has
beenbuilt upto oppose the action of the clamp piston
chine chassis 21 by trunnions' 37‘. ' Cylinder and piston
36 operate a ram toggle 38 which through the agency 10f
42 moves a ram head 39 and a punch holder 41.
After the mandrel has been inserted to support theiwalls
of the-work piece, the ?nal clamping pressure ‘necessary
to secure the work piece. for ‘thepunchihg operation can
be applied with no resulting ‘damage to the ‘walls. of'th‘e
workpiece.
order tonacrcomplish‘ the‘above‘ objective,
65
clamp cylinder 28 during the operating phase of the
machine, the piston 28a will force the toggle links 46 and
48 to‘ the right of the position shown in FIG. 3. Inasmuch
as pivot shaft 47 is ?xed, the toggle links 46 and 47 will
move towardg'a- straight line position to force clamp jaw
25 in ‘the vertical direction. Clamp 'jaw 25 isguided in
the vertical direction ‘by channels49, see FIG. 5, formed
in cambars 27_.v Upward vertical movement of clamp
jaw. 25. forces the, gripping surface 51 of the clamp jaw
25 into engagement with the ‘work piece '32 whereafter 75
receive .cdovfe tails 55 Hfo‘rrned‘on the cam ‘bars 27.
_ __'I‘he die plate 35 is mounted between the ‘parallel cam
bars 27 and" cam ‘followers 34 on the edge of the die
plate 35 ?t within camchannels 57 formed in the cam
bars 27. The rear, surface 56 of the die plate 35 rests
against the front surfaces of yoke 23 and clamp jaws 24
and 25Mof_the machine. 1 'Ihefcarn followers 34 and the
cam channels 57 of cam bars 27 cooperatively secure‘ the
die plate 35cagainst horizontal movement while the die
plate vV35 islin anoperation position against the yoke 23
and the clamp jaws 24 and 25. The die plate 35 ‘is $8
5
6
cured against vertical movement in the ?rst indexed position by guide pins 44 and an upper die plate stop 58. The
guide pins 44 which are rigidly attached to the stationary
clamp jaw 24 fit within the guide pin apertures 45 of the
die plate 35 to prevent the die plate from moving verti
cally downward while die 54 is aligned with the work
piece. The upper die plate stop 58 limits the vertical
movement of the die plate in the upward direction.
can bars 27 were forced vertically downward from a
?rst indexed position, as disclosed in FIG. 1,, the index
ing of the die plate 35 can take place in reverse. Re
verse operation of the cam bars 27 results in movement
of the die plate 35 exactly in reverse of that above-de—
scribed and therefore, will not be described in detail.
The ram head 39 is attached to toggle link 42, as il
lustrated in FIG. 2. This ram head carries the punch
holder 41 on which four punches are mounted 90° apart.
Refer now to FIG. 1 generally and particularly to
FIG. 5, after a first punching operation has been com 10 Only one of these four punches is in operation at any
one time. When a given punch is to be used, it is in
pleted by the machine with the die plate 35 and cam
dexed to the uppermost of four possible head indexing
bars 27 in the ?rst indexed position (as shown), the in
positions such as illustrated by punch 43, of FIG. 2.
dexing pistons 33a ‘are actuated to pull the cam bars 27
The punches are indexed to work position by a ?uid m0
vertically downward. Prior to any downward vertical
movement of the cam bars, the cam followers 34 which 15 tor 73, which mechanically drives spur gear 71, see FIG.
6. Gear 71 meshes with ring gear 72 on the periphery
are part of the die plate 35, see FIG. 7, are engaged
of the punch holder and drives the punch holder 41 in
with surfaces 59 and 61 of cam channel 57. In this
the counter-clockwise direction. The indexing of the
position, the cam followers 34 are restrained by surfaces
punch holder takes place in response to the hydraulical—
59 and 61 of the cam channel 57 from horizontal move
ly operated ?uid motor 73 under the control of an elec
ment to the left in FIGS. 3 and 5, and since the rear
trical control circuit illustrated by FIG. 10.
surface 56 of the die plate 35 is resting against the yoke
Cam 77 having peripheral cam surfaces 74, 75, and face
23, the die plate 35 is locked in the horizontal plane.
cams 76 is adapted to operate suitable microswitches LS7,
As indexing cylinders 33 ‘begin to draw the cam ‘bars
LS6, and LS8, respectively, as illustrated in FIG. 11.
27 vertically downward, guide pins 44 restrain the die
plate 35 from moving downward so that the cam bars 25 Cam surface 74 strikes switch LS7 at the end of a com
plete operating cycle of the machine in order to initiate
27 move vertically downward relative to the die plate 35.
stoppage of the machine. Face cams 76 disengage switch
The cam ‘bars 27 move downward with respect to the
LS8 so that the indexing of the punch holder can be
die plate 35 until cam followers 34 engage surfaces 62
stopped at the proper succeeding work position. While the
of the cam channel 57. Continued downward movement
of the cam bars 27 results in the cam followers 34 fol 30 punch holder 41 is in the position illustrated in FIGS. 6
and 11, the cam surface 75 is not engaging switch LS6 and
lowing surfaces 62 thus imparting horizontal movement
switch LS6 is open, see FIG. 10. Since LS6 is open, sole
to the left to the die plate 35 in FIG. 3. When the cam
noid 81A is energized through switch LS4 and normally
followers 34 reach point 63 in the cam channel 57, the
die plate 35 has been moved horizontally away from the
closed contact A4 and, therefore, ?uid is forced into cylin
clamp jaw 24 a sufficient distance so that the guide pins
' der 33 to maintain die plate 35 in the uppermost position,
44 have been disengaged from the guide pin apertures
illustrated in FIG. 1. When the punch holder 41 rotates
to the second work position, switch LS6 is operated by
45. The guide pins 44 now no longer restrain the die
plate 35 from downward vertical movement.
At the same time that the cam followers 34 are
earn surface 75 of the cam 77 on the punch holder 41 and
the die plate 35 in response to the closure of switch LS6 is
cammed to position 63 in the cam channel 57, the cam 40 indexed to the second work position. Springs '78, see FIG.
6, act as inertia take-up devices. Each spring 78 is con
bars have moved relative to the die plate 35 far enough
tained within a recess 111 formed in the rear surface of
so that spring loaded detents 64 on either side of the
punch holder 41. Each lug 109, which is a part of a rim
die plate, see FIG. 7, engage detent channels 65 formed
112 of cam 77 engages and compresses each spring 78.
in the cam bars 27. The channels 65 are formed with
As the holder is being rotated by ?uid motor 73, the
bevelled sides.
dynamic inertia of the rotating holder 41 prevents stop
With the detents 64 engaged to carry the die plate with
page at an exact predetermined position and results in
the cam bars 27, with the cam followers 34 in position
63, and with the guide pins 44 disengaged from the die
plate 35, continued downward movement of he cam bars
overriding the work position. When the ?uid motor 73
stops rotation of the holder 41, the springs 78 are com
27 will carry the die plate vertically downward until 50 pressed by lugs 169 to absorb overtravel of the hydraulic
further downward movement of the die plate 35 is ar
motor 73. The cams 76 are actually depressions formed
rested by lower die plate stop 66. Stoppage of the die
plate by the lower stop 66 again results in relative ver
in the face of the holder 41. A spring urged detent 75a
strain the die plate 35 from vertical upward movement
‘and also accurately position the die 53 in alignment with
'work piece 32. Continued downward movement of the
pressure is applied by the clamp jaw 25.
engages the face of the holder 41 so that when the motor
73 stops, the detent 75a moves within a cam depression
tical movement of the die plate 35 with respect to the
76 to hold the punch holder in a predetermined work
cam bars 27. The spring loaded detents 64 are cammed
position.
out of detent channels 65 and the cam followers 34 are
In one embodiment of the machine, the ‘four punches
forced to engage surfaces 67 of the cam channel 57. As
are hollow and each contain a mandrel 52. Since a great
the cam followers 34 travel along ‘surfaces 67, the die
deal of pressure is applied to the walls of a tubular work
plate is forced to move horizontally to the right as viewed
in FTGS. 3 and 5 into contact with the clamp jaws 24 60 piece 32 by clamp jaw 25, there is a possibility that the
sidewalls of the work piece may collapse. To prevent
and 25. The disengaged guide pins 44 reengage a sec
collapse of the sidewalls, the mandrel 52 is inserted into
ond set of guide apertures 68 in die plate 35. These
the tubular work piece prior to the time the ?nal clamping
guide apertures 68 cooperate with guide pins 44 to re
ment, tthe indexing pistons 33a discontinue movement.
The head 39 and punch holder 41 are pivotally attached
to toggle link 42 by a pin 79. As the piston 36a moves
the link 42 downwardly, the ram head 39 is moved in the
horizontal direction out of engagement with the work
piece 32 and die 54. The head is restrained in the hori
zontal plane by suitable guideways 81 which are mounted
The die plate 35 and die 53 are now in the second in
on the machine chassis 21.
cam ‘bars continues until the cam followers 34 are locked
Ibehind surface 69 of the cam channel 57. After the
die plate 35 is locked to secure it from horizontal move
dexed position and ready for the subsequent punching
and Hanging operations to ibegin. It should be under
Link 82 of the ram toggle is connected to the machine
chassis 21 by block 83 which is bolted to the chassis 21.
The bolts are not shown. Between the chassis wall 84
stood that although the operation of the cam bars 27,
die plate 35 ‘and index cylinders 33 was described as the 75 and the block 83 is a pressure responsive device 85
3,678,906
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t
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7
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8
utilized to, operate ‘certain controls in the machine. , The
system, the ‘switch PS3 will operate and the machine will
pressure responsivedevice 85 is a ‘hollow metal body in
be turned 'o?’.
.
‘
Next the manual push-button switch PB4 is ‘closed.
the form ‘of a parallelepiped which actuates pressurerre
Since switch LS2 is normally closed at the beginning of
the cycle due to engagement with a cam surface on toggle
link 195 when the clamp 25 completely released the work
piece at the end of a previous cycle, closure of switch
P34 completes an electrical eireuit through a solenoid
sponsive switches PS1, PS2, and PS3, see FIG. 11, and is
?lled with oil or some other suitable ?uid medium under
a predetermined pressure. The ?uid in the pressure re
sponsiv'e device 85 communicates with and operates
Bourdon tubes 121, 122, and 123 to operate pressure re~
spo'usive switches PS1, ‘PS2, and .PS3 respectively. A
niajor wall ofv the pressure device 85 which rgsts against
SSA. Energized solenoid SSA operates hydraulic valve
S5 to allow oil to how into pressure line 93 which is
block ‘83 is as large as and matches the surface v113 of
block :83 so_tha_t as block 83 is forced to the left in FIG. 2,
necessary to operate the machine. Solenoid SSA rei'nains
energized throughout the operating cycle of the ‘machine.
forces transmitted through block 83 compress the periphery
Manual closure ofa switch PB4 completes an electrical
circuit throughsolenoid S2A. Solenoid S2A operates hy
draulic valve S2 _to place pressure on line 94. When line
S‘?tiis pressurized, oil is forced through a pressure 'rc
of minor walls of device 85 between block '83 and chassis
Wall 84. Since the minor Walls which form the periphery
of the pressure device 85 are compressed by the forces
ducer 85 into clamp toggle cylinder 28. Piston ‘28a begins
toforce clamp‘ toggle 26 in the operating phase so that
clamp jaw 25 armed in the upward direction to engage
the work piece 32, which is inserted between the station
ary clamp jaw 24 and the movable clamp jaw 25.“ Since
exerted when rain assembly 38 operates, the major walls
of thevpr‘essuremdevice 85_will bemoved together relative
to each otherbetweenchassis wall 84 and block surface
113, thus compressing the ?uid within the pressure device
85. A change of ‘the predetermined pressure within the
device 85 is sensed by‘the pressure sensitive
pressure ‘reducer 25 is in the hydraulic system, the hy
draulic pressure which builds up‘in clamp toggle cylinder
switches PS1, PS2, andPS3. _ The forces exerted on ‘the
periphery of the pressure device 85 when ram assembly 38
2-8 ‘is limited to a predetermined value such 'as 200 psi.
operates are not large enough to exceed the elastic limit 25 At the sametime that hydraulic pressure is building
of?'the materialin‘ the ,minor walls, but adequate coin~
upin clamp toggle cylinder 23, hydraulic pressure is also
bilding up in clamp toggle stop‘cylinder 31. Fluid under
pressure in line 94 is ,forced‘ through line 106,,to vyalve
S6 and into the stop cylinder 31 through line 104. When
pression takes place to effectuate an appreciable change in
?uidpres'sure.
,
,7
.
., ‘_One embodiment of the present machine contemplates
the, use of ‘two different punching pressures for the ?rst
punching operation and a second toggle pressure for the
30
subsequent punching operations. To accomplish these
di?verentlpunching pressure requirements, a low pressure
responsive switchJPS'I is placed in the pressure device 85,
‘seeFIGS, land 11. On ‘the ?rst punching‘operatio‘n the
pressure exertedv on ‘the ram head 39 by toggle 738 will be
35 and since the stop cylinder 31 is at hne pressure, the force
of the clamp cylinder will be overcome by the opposing
force of the piston of stop cylinder 31 and further clamp
sensedby pressure sensitive ‘switch PS1_when the prede
terrniried pressure of, the vpressure device 85 has been
ing force will be momentarily stopped.
changed by a given value. Switch PS1 will, by ‘controlling
‘toggle 38 exerts a great deal more pressure ‘on ‘the ram
,
i
i
actuates hydraulic valve S1 to alow oil to ?ow in line
45 96 to the ?ow divider 97 and into indexing cylinders ‘33.
Indexing pistons 3311 move the die plate 35 in the upward
direction to place die plate 35 in the ?rst operating posi
tion as disclosed in FIG. 1. In this position, die 54 is in
position to cooperate with the ?rst of four punches on the
punch holder 4-1. As the indexing pistons 33a move the
die plate into the ?rst operating position, a cam surface
on die plate 35 shown in FIG. 11, strikes and closes switch
LS4. Closure of switch LS4 completes a circuit through
solenoid 81A and maintains the indexed die plate 35 in
i
_ Also,r_included in the ‘pressure device 85 is a third pres
‘sure ‘sensitive switch PS3. This switch is operated to stop
the‘rnachine _in_ the event that the preload pressure in the
device‘ 85‘ falls‘below a predetermined value.
I
:A, complete description ‘of the operation of the machine
will now be given to include the electrical ‘circuit ‘of ‘FIG. ‘
It), the mechanical, schematic of FIG. 11 and'lthe hy
draulic “schematic ‘of FIG. 9.
Refer ?rst to the electrical circuit,
10.. Power
‘source 36 provides power to‘operate the hydraulic pump
motor 87 ‘,to apply pressure ‘to the ?uid in the hydraulic
system of FIG. 9, and also, it provides the power for the
electrical control ‘system which is illustrated by the cir
euitry of FIG. ‘10, and which is fed by transformer ‘88.
,
relay CR1 which closes contacts CR2, CR3, CR4, CR5,
CR6, and CR7. Closure of switch PB7 also completesan
electrical circuit through solenoid S1A. Solenoid Sl-A
fore pressure switch PS2 closes and ‘reverses the ram
,
_
40 sure of switch P137 completes an electrical circuit through
head 39 and, consequently, on the'pressure device 85 be
head39_.,ri
,
Nextmanual push-button switch PB7 _is closed, Clo
the. hydraulic circuit, limit the toggle pressure for the ?rst
punching operation. Since higher punching pressures are
desired ‘for the subsequent punching operations, a second
pressure sensitive'switch PS2 is placed in the pressure
device 85. After the ?rst punching operation, switch PS2
rakes 'oyer control 'of thehy'draulic system and the ram
the clamp cylinder has moved the clamp toggle links 46
and 4-8 far enough so that work piece 32 is securely
clamped, the links 46 and 48 will come to rest against the
piston or” stop cylinder 31. ,Since the clamp cylinder 28
is being actuated under a reducedpressure of 200 12.51.,
60
the upward or ?rst operating position. Switch LS1 lo
cated adjacent to toggle link 105 and operated by ‘a cam
surface on the link 105, see FIG. 11, is closed by the
initial forward movement of the ‘clamp toggle 26. Switch
LS1 augments the operation of switch ?B7 and locks the
control circuit into an automatic cycle by maintaining
relay CR1 closed after switch PB7 is released.
As the above switches are being closed, the effect of
the clamping cylinder 28 has been completely overcome
N First the power‘source 86 energizes the hydraulic pump
by the piston of clamp stop cylinder 31. At the com~
motor 87. At this ‘time the power unit 91 (see FIG. 9) 65 pletion of the initial clamping motion, a switch ‘LS3 is
‘of’ the‘ hydraulic system builds up fluid pressure in the
closed by the forward motion of the clamp toggle, see
hydraulic system in preparation for operation. Next,
switch 92 is manually closed to setthe, ‘electric control
circuit ‘for automatic operation, the cold ?anging machine
can also be readily adapted to operate with a manual
push-button type electrical control circuit. Pressure oper
ated safety switch PS3, is normally closed and remains so
throughout the machine. Operation . unless. the. PIE-load
11. Since ‘switch LS9 isinormally closed at ‘the
‘beginningiof the operation, closure of switch LS3 will
‘complete an electrical circuit through time delay ‘relay
'C which immediately closes contact C1 and "completes a
circuit ‘through solenoid 8313., The energized ‘solenoid
SSB’operates hydraulic valve S3 ‘which allows oilto ?ow
into line ‘98 and into the ‘ram cylinder ‘36. This'oil flow
In the event the pressure fails to build up in the hydraulic ‘ ' to cylinder ‘35 results in‘operation of'the ram toggle 38
:pressureyin device 845 fallsbelow apredeterrnined‘level.
9
10
which in turn forces the ram head 39‘ to travel toward
the clamped work piece 32. Mandrel 52 is inserted with
in the work piece 32 during the initial movement of ram
head 39 while the workpiece 32 is being secured by a
slight clamping pressure. After a time delay as deter
work piece 32. is not entirely released by the clamp as
sembly until after all the punching operations have been
completed, but merely relaxes the gripping pressure while
the mandrel 52 is withdrawn from the work piece 32..
After each succeeding punching operation, the ?uid pres
mined by relay C, contact Cl. is opened and solenoid
53B is deenergized but since valve S3 is not spring biased
to return the valve to a previous position, the hydraulic
valve S3 remains in the operated position, such that ?uid
sure in cylinder 23 is reduced so that the work piece 32
will not be damaged by excessive clamping pressure.
When switch LSltl is opened due to withdrawal of ram
head 39, solenoid 86B is deenergized and valve S6 is re
continues to enter ram cylinder 36 through line 98.
10 turned to the position illustrated in FIG. 9 wherein ?uid
?ows from line 1% into stop cylinder 31 and the pres
As the ram head 39 moves forward, a lobe cam, shown
only in FIG. 11, on chassis 21 actuates and closes switch
LSlltP. Closure of switch LSltl completes an electrical
sure reducer 35 is operated to reduce the line pressure to
cylinder 28. The piston 28a then reduces the gripping
pressure on the work piece 32 until the advancing ram
circuit through solenoids 86B and S7B simultaneously.
Energized solenoid S’7B places a 1500 p.s.i. sequence valve 15 head 39 again inserts the mandrel within the tubular
workpiece 32.
99 into the pressure line 98 of the ram hydraulic circuit.
Continued reversing motion of the ram assembly will
Sequence valve 99 impedes the ?ow of ?uid to cylinder
result in closure of switch L812, see FIG. 11. Switch
36 until a predetermined pressure, such as 1500 p.s.i. is
L812 completes the electrical circuit through time delay
attained in the pressure line 93, thus advance of ram head
20 relay D and also through solenoid S43. Since contact
39 is momentarily interrupted.
B1 is closed at this time and contact D1 will not be
Energized solenoid Sd-B operates hydraulic valve S6
opened for a predetermined time, solenoid Sd-B operates
to switch the pressure reducer 95 and the clamp toggle
valve S4, which actuates ?uid motor 73 to begin indexing
stop cylinder 31 out of the hydraulic circuit. When valve
the punch holder 41. Fluid motor 73 which drives gear
S6 is operated, ?uid drains out of cylinder 31, through line
1%, and into drain 107 through valve S5. Actuated valve 25 72 through pinion '71 rotates the punch holder 41 in the
counter-clockwise direction. After the time delay deter
S5 places line pressure on reducer 95 through line 166
mined by relay D, contact D1 is opened to deenergize
to force reducer 95' out of operation. Now while the
solenoid S415, but a machined surface between face cams
mandrel S2 is supporting the walls of the work piece 32
76 on the rotating punch holder 4-1 operates arm 192 and
and the pressure sequence valve 99 is maintaining the
ram 39 motionless, the pressure in line 94 of the clamp 30 closed switch LS8 which maintains the electrical circuit
through Sit-B so that hydraulic valve S4- remains operative
cylinder 28 builds up to overcome the deactivated clamp
and the hydraulic motor 73 continues to rotate the punch
stop cylinder 31 and to force clamp jaw 25 to secure
holder at until the arm 19?, engages face cam '76, see
work piece 32 in the ?nal clamping phase in preparation
PEG. 11, and opens switch LS8. When switch LS8 is
for the punching operation.
35 opened solenoid S43 releases hydraulic valve S4 and the
After pressure in the ram hydraulic circuit operates
hydraulic motor '73 discontinues further rotation of the
the pressure sequence valve 99, oil under full line pres
punch holder 41. Spring 78 of FIG. 6 is an inertia device
sure is forced through line 93 and into ram cylinder 36
adapted to correct any tendency the punch holder 41 may
to advance the ram head 39 and force the punch 43 into
engagement with the exposed end of work piece 32 to 40 have to override the indexed position. After the punch
holder 41 has come to rest, the second punch is in posi
upset the end thereof.
tion for the next punching operation.
As the indexing head rotates to the second punch posi
tion, the disengaged switch LS6 is closed by surface 77.
Closure of switch LS6 completes the electrical circuit
through
contact CR7 and relay A which closes contacts
45
the force of the ram toggle 38 against the machine chas
A1 and A3 and opens contacts A2 and A4 associated
sis at surface 84 will compress the Walls of pressure sensi
with switch LS4 and solenoid SlA. Solenoid 81B is
tive device 85. The changed ?uid pressure in the pres
energized ‘and operates hydraulic valve S1 to reverse the
sure sensitive device 85 will operate pressure sensitive
?uid ?ow to indexing cylinders 33. Fluid now ?ows out
switch PS1.
of cylinders 33, through line 96, and into an exhaust line
Closure of pressure sensitive switch PS1 completes the
1% through valve 51.
electrical circuit through time delay relay E and results
The indexing pistons 33a move downward drawing cam
in closure of contact E1. Closure of contact E1 results
bars 27 downward, as previously described. As the cam
in energization of solenoid 53A. Energized solenoid
bars travel downward, the cam followers 34 will follow
SSA operates hydraulic valve S3 and reverses the ?uid
cam channels 57 to ?rst force the die plate 35 horizon
55
?ow to the ram cylinder 3.6. Fluid will now ?ow out
tally outward from the stationary jaw 24 to disengage
through line 33 and ?uid will be forced into line Mill to
guide pins 44. The die plate 35 will then be carried
reverse the ram cylinder 35. Reversal of the ram cylin
downward by the descending cam bars 27 until the fur
der 3% thus results in releasing ram toggle 33 which in
ther downward movement of the die plate 35 is arrested
turn begins to back the ram head 39 and punch 43 away
60 by die plate stop 66 at which time the die plate 35 will
from the die plate 35 and the work piece 32.
be cammed horizontally toward the clamp jaw 24 and
The reversing ram head 39 results in disengagement
guide pins 44 will move Within guide apertures 68. When
of switch LSltl. When this occurs, solenoid S7B is de
the die plate 35 is in this second die plate position, such
energized and pressure sequence valve 99 is taken out of
that die 53 is in alignment with work piece 32, the index
line 98. Thus, the pressure exerted by the ram head 39
pistons
33a will discontinue descent. The die plate 35
65
and punch 43 on the Work piece 32 is released. Dis
and die 53 will remain in this second die plate position
engagement of switch LSld also results in deenergiza
and in alignment with the work piece for the remainder
tion of solenoid S63 and, consequently, pressure reduc
of the punching operations.
ing valve 95 is placed back in the clamp cylinder hy
When switch LS6 is closed, and it remains closed for
draulic circuit. The pressure reducing valve 95 releases
the remainder of the punching operations, contact A2
the clamping pressure on the workpiece very rapidly so
associated with pressure switch PS1 and solenoid SSA is
that the work piece is secured by the clamp jaws at a re
opened and breaks the electrical circuit through solenoid
duced gripping pressure. The gripping pressure on the
SEA. Thus, solenoid SSA will not now a?ect the op
work piece is reduced before the mandrel 52 is extracted
eration of hydraulic valve S3.
from the Work piece 32 by the reversing ram 39. The
Also during the indexing of the punch holder 41,
Punching pressure is applied to the work piece 32. by
the ram toggle assembly 33 until a predetermined magni
tude of pressure is attained. When this given magnitude
of pressure is attained by the ram toggle assembly 38,
3,078,906
11
for advancing said mandrel and ~fabricating tool to in
sert said mandrel within said workpiece and ‘to upset the
workpiece within a ?rst ‘of said positioned dies, means
operated by advance of said fabricating tool for ‘deacti
vating said- opposing means after said mandrel 'has been
‘switch‘LS9 is opened; therefore, solenoid 53B is ‘also de
energized and ‘will not affect hydraulic valve S3. At
~the ‘end of the punch holder indexing when arm 102
enters a face cam 76 and opens switch LS8, switch
LS9 is again closed. Since switch LS3 remains closed
during ‘the entire operation of the machine, closure of
switch LS9 energizes solenoid $33 which operates hy
draulic valve S3 to allow ?uid ?ow in line 98 to begin
forcing the ram assembly 38 in the forward direction to
‘begin the second ‘punching operation.
The subsequent punching operations take place exact
‘19 as in the above-described operation except that on
inserted within the tubular workpiece, means responsive
to a predetermined pressure ‘exerted by said fabricating
tool on said workpiece for withdrawing said tool from
to
said ?rst die, ‘and means ‘operated by the withdrawal of
said fabricating tool from said ?rst die for operating
said selectively moving means to position the second die
in operative association with the workpiece.
‘the’second and subsequent punching operations, pressure
'5. In a fabricating machine, means for holding a
‘switch PS2 takes ‘control of the electrical circuit to re
verse ‘the ram 39 rather than pressure switch PS1.
workpiece, a carrier having a-pair‘of spaced dies mounted
therein, means for selectively moving said carrier ‘to se
qu‘e‘ntially position said ‘dies in operative association with
a workpiece insaid holder,-a ‘fabricating tool, means for
‘reciprocating said tool to advance said tool through‘and
At the end of the four punching operations, the punch
holder will again ‘be indexed so that the ?rst punch is in
‘position ‘to begin another complete '?anging'cycle. When
this punch holder indexing takes place,'cam surface 74 on
the punch holder ‘41, see HG. 11, strikes and closes
switch LS7, see FIG. 10. Closure of switch LS7 com
‘jiletés the ‘electrical ‘circuit through solenoid 828 which
in turn operates hydraulic valve S2. When valve S2‘is
from ‘a ?rst of said positioned dies to act on said work
20 piece, and means operated ‘by the withdrawal of said
‘fabricating tool from said ?rst ‘die for operating said
selectively moving means to ‘position the second of said
dies ‘in ‘operative association with the workpiece.
operated ‘by solenoid 8212-, it reverses the ?uid how to
6. In a ?anging machine, means {for holding a work
clamp cylinder 28 so ‘that ‘the clamp toggle 26 completely
piece, a plurality ‘of dies, die ‘plate means for supporting
the dies, a pair of cam vbars having camming surfaces
withdraws ‘clamp jaw "thus releasing the ?nished work
thereon, means for moving "said camming surfaces ‘into
"piece ‘so ‘that it can be removed from ‘the machine. At
engagement with said die plate means to selectively move
‘this ‘time‘the machine is ‘stopped and push-button switches
‘said the plate means to sequentially position said dies
‘P137 and P134 must again ‘be closed to start the ‘machine
30 ‘into engagement with said workpiece, a ‘punch holder
‘for another complete punching cycle.
‘
‘having a plurality of punches mounted thereon, means
It is who understood that ‘the above-described arrange
for indexing said punches to a predetermined work posi
'ment of apparatus and components and construction of
tion, means for reciprocating ‘such positioned punch to
elemental parts are simply illustrative 'of an application
advance said punch through and‘from a'?rst of said posi
‘of the principles ofthe invention, and many other modi
1?cations may be made'without departing from the inven ' 'tioned'dies to act on said held workpiece, and means
operated by the indexing of a subsequent punch for oper
1tion.
ating said‘moving ‘means to position the second of said
What is claimed is:
dies into engagement with the workpiece in said ‘holding
1. In a "fabricating machine, ‘a clamp, ‘means for 'actu
means.
‘ating‘s‘aid clamp to grip a'workpiece, means for opposing
7. In a fabricating machine, means for holdinga work‘
said actuating means, a fabricating'tool mounted for 40
:piece, a die plate having a pair of dies mounted therein,
movement toward a workpiece gripped by said clamp,
means for indexing said die plate to place a ?rst of said
vmeans for moving said fabricating tool, and means'oper
dies into engagement with said workpiece in said holder,
“ated ‘by Ethe movement of said fabricating tool for render
a‘vfabricating tool, means for moving said fabricating tool
‘ing 'said ‘opposing ‘means ineffective.
through said ?rst ‘die and into and ‘out of engagement
2. In a fabricating machine, a clamp, means foractu~
‘with the held workpiece, ‘means responsive to a predeter
lating's‘aid‘clamp to ‘grip a workpiece,'means for opposing
mined force exerted on .said workpiece by said tool for
said actuating means, an ‘index head having a plurality
interrupting further operation‘of said moving means, and
‘of fabricating tools ‘mounted ‘thereon, means for recipro
means actuated by the withdrawal of said tool from said
cating one of said fabricating tools to advance ‘and with
'die by said moving ‘means for indexing said die plate to
draw said fabricating ‘tool from engagement with said
.place a second of said dies into engagement with said
workpiece, means operated by the'advance of said ‘fabri
h'eld workpiece.
‘eating tool ‘for rendering said opposing means ineffective,
8. In a fabricating machine, ‘a clamp, means for actuat
and means operated by ‘the withdrawal of said fabricat
ing said clamp to vgrip a workpiece, means for opposing
‘ing tool for vindexing said ‘index ‘head.
an a fabricating machine, a clamp, means for actu 55 said actuating means, a carrier having a pair of dies
mounted ‘therein, means for aligning said carrier and a
ating said clamp to grip a workpiece, means for opposing
?rst of said dies with said workpiece, a fabricating tool,
‘said actuating means, -a carrier having a pair of dies
'means for moving said fabricating tool through said ?rst
‘mounted therein, means for moving said- carrier to align
die and into engagement with the gripped workpiece,
‘a ?rst of ‘said dies with said workpiece, a fabricating
m1 mounted for advancement to and withdrawal from 60 means operated by the advance ofsaid fabricating tool
by said moving means for rendering said opposing means
‘said workpiece ‘and said ?rst aligned die, means operated
.inoperative, ‘means responsive to a predetermined force
by ‘the advance of said fabricating tool for rendering
‘exerted on said workpiece by said fabricating tool for
‘said opposing means ineffective, and means actuated. by
interrupting further operation of said moving means, and
"the withdrawal of said fabricating tool for operating said
means actuated by withdrawal of said tool from said
moving means to move said carrier to align a second of
3said dies with said workpiece.
4. A ‘fabricating machine for upsetting the end of a
workpiece by said moving means for operating said align
ing means to move said die plate to align a second of
said dies with said workpiece.
tubular workpiece which comprises means for gripping
"said workpiece, means for opposing the gripping means
9. A ?a'nging machine for upsetting therend of a work
to li'mit‘the ‘gripping pressure exerted on said workpiece, 70 piece which comprises a clamp, means for actuating said
clamp to grip said workpiece, means for opposing said
‘a die platehaving a. pair of dies mounted therein, means
‘for selectively moving said die plate 'to sequentially po
actuating means, a die. plate having a pair of dies mounted
sition-said dies in operative association with ‘a work~
‘therein, means for aligning said die plate and a ?rst of
‘said dies with‘said workpiece, a. punch holder having a
piece insaid gripping‘ means, a fabricating tool, a'man
drel rcoaxially ‘mounted with'said fabricating‘tool, means
plurality of ‘punches mounted thereon, means for re—
3,078,906
13
ciprocating a ?rst of said punches to and from engage
ment with said ?rst aligned die and workpiece, means
operated by advancement of said ?rst punch to render
said opposing means ineffective, means responsive to a
predetermined force exerted on said workpiece by said
?rst punch for interrupting further operation of said re
ciprocating means, means actuated by the withdrawal of
said ?rst punch from said ?rst aligned die and workpiece
for indexing said punch holder, and means actuated by
said indexing means for operating said aligning means to
move said die plate to align a second of said dies with
said workpiece.
10. An indexing apparatus for moving a die int-o align
ment with a workpiece which comprises a die plate hav»
14
13. In an indexing apparatus for placing a die in work
ing engagement with a workpiece, a die plate having a
pair of dies mounted therein, cam followers secured to
two opposite surfaces of said die plate, a restraining
means for engaging said die plate to restrict vertical
downward movement while said die plate and a ?rst of
said dies are in engagement with said workpiece, a ?rst
limit means for limiting the vertically upward movement
of said die plate, a pair of cam bars having cam sur
faces thereon for engaging said cam followers to guide
said plate to and from engagement with said workpiece,
said cam bars having recesses formed therein, power
means for moving said cam bars in the vertical direction
whereby said cam surfaces engage said followers and
force the die plate out of engagement with said restrain
ing a die mounted therein, a restraining means for engag
ing means and ?rst limit means, detents on said die plate
ing said die plate, cam bars having cam surfaces thereon
adapted to engage said recesses in said cam bars to facili
for moving said die plate into and out of engagement
tate simultaneous unidirectional vertical movement of
with said restraining means, and means for moving said
said die plate and said cam bears, a second limit means
cam bars to cam said die plate out of engagement with
said restraining means and to carry said die into align 20 for stopping the vertical downward movement of said die
plate whereby said detents disengage said recesses and
ment with said workpiece w-hereafter said cam bar moves
continued vertical movement of said cam bars cams the
said die plate to reengage said restraining means to secure
die plate into engagement with said restraining means to
said die in alignment with said workpiece.
place a second of said dies into engagement with said
11. In an indexing apparatus, a die plate having a die
mounted therein, means for securing a workpiece, a re 25
workpieces.
straining means for engaging said die plate with the die
spaced from the workpiece, means for moving said die
plate out of engagement with said restraining means and
for aligning said die with said secured workpiece, and
means on said moving means for reengaging said die plate
with said restraining means to thereby secure said die in
14. In a fabricating machine for forming a workpiece,
means for clamping the workpiece, means for restraining
the clamping means to limit the clamping force applied
to the workpiece, a forming tool, means actuated by the
clamping means for advancing the tool into engagement
with the clamped workpiece, means actuated by the ad
vancing means moving the tool into engagement with the
alignment with said workpiece.
workpiece for interrupting the operation of the advanc
12. In an indexing apparatus for moving a plurality of
ing means, and means rendered effective upon said inter
dies into engagement with a workpiece which comprises
a die plate having a pair of dies mounted therein, cam 35 ruption for overriding the restraining means so that the
clamping means applies an unrestrained clamping force
followers secured to opposite surfaces of said die plate,
on the workpiece.
a restraining means for restricting movement of said die
plate to secure one of said dies in working engagement
References Cited in the ?le of this patent
with said workpiece, a pair of cam bars having cam sur
faces thereon for engaging said cam followers, means for 40
UNITED STATES PATENTS
moving said cam bars to force said die plate out of en
1,153,287
Candee _____________ __ Sept. 14, 1915
gagement with said restraining means and for carrying
said die plate to a second position whereat the inter
action of said restraining means and cam bars forces a
second of said dies into engagement with said workpiece. 45
2,176,188
2,622,652
2,766,825
Poole et a1. __________ __ Oct. 17, 1939
Conroy et a1. _________ __ Dec. 23, 1952
Prater et a1. __________ .._ Oct. 16, 1956
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