close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3096816

код для вставки
July 9, 1963
c. H. ROOT
3,096,806
COMBINED STRETCH AND WIPE FORMING MACHINE WITH
AUTOMATIC TRAVERSE CONTROL OF THE WIPE SHOE
Filed Aug. 17, 1960
2 Sheets-Sheet 1
i“,
‘IN VEN TOR.
6612i” JV- awz,
BY
‘'
W
A“,
4 Arrows/5W
July 9, 1963
c. H. ROOT
3,096,806
COMBINED STRETCH AND WIPE FORMING MACHINE WITH
AUTOMATIC TRAVERSE CONTROL OF THE WIPE SHOE
Filed Aug. 17, 1960
2 Sheets-Sheet 2
251/. f?
I OLA "
694
|
1
162a
ll
‘Ll /
H2
IR
686
619C
m. a
two. 5/
F].
(WW/7
30
DlREc'noN 0F
TABLE ROTATION
30
INVENTOR.
United States Patent 0 " [C6
1
,
3,095,806
Patented July 9, 1963
2
sion applied by the stretch forming assemblage. Like
3,096,806
wise, the predetermined instantaneous line of contact of
COMBINED STRETCH AND WIPE FORMING MA
CHINE WITH AUTOMATIC TRAVERSE CON
TROL OF THE‘ WIPE SHOE
the wipe forming shoe and stock hereinafter designates
Clinton H. Root, Maple Heights, Ohio, assignor to The
(iyril Bath Company, Solon, Ohio, a corporation of
maximum limits thereof, either forwardly or rearwardly
Ohio‘
Filed Aug. 17, 1960, Ser. No. 50,280
9 Claims. (Cl. 153—40)
This invention relates to a combined stretch forming
and wipe forming machine employing a traversing wipe
shoe- in‘ which the traversed positions of the wipe shoe
a line of contact superposed on such normal instantane
ous line of tangency, or within predetermined controlled
therefrom in the direction of travel of the stock.
A principal object of the invention is to provide a con
trol for controlling the power drive of the traversing
10 shoe so as to maintain the shoe at the perdeterrnin'ed in
stantaneous point of contact of the stock on the die.
A more speci?c object is to accomplish this result by a
very simple and effective control having few moving
parts whichare generally simple, relatively inexpensive,
are automatically controlled in relation to the wrapping
15 and readily available.
of the stock onto the side face of the die.
Another object is to provide a wipe shoe and sensing
More speci?cally, the invention relates to a wipe shoe
combination for sensing the relative approach and re
and control. combination by which the wipe shoe is auto
cession of either the face of the stock, or the side face of
matically maintained in the most effective wiping position
the die, relative to the shoe in the direction of the line of
in relation to that normal instantaneous line of' tangency
application of the wiping pressure at locations which are
of the stockcand die which would result from the applied
spaced endwise of the stock from the portion of the shoe
stretch forming tension in the absence of any wiping
which is in pressure wiping contact with the stock.
operation.
Other objects and advantages will become apparent
The presentrinvention is an improvement on the com
from the following ‘description wherein reference is made
bined wipe and stretch forming machine disclosed in the
Dolney land Hein patent, No. 2,810,421, issued October 25 to the drawings, in which:
FIG. 1 is a diagrammatic top plan view of the com
22, 1957, the improvement residing principally in the
bined wipe and stretch forming machine embodying the
control for controlling the traversing of the wipe shoe
principles of the present invention;
and the manner of incorporation of some of the control
FIG. 2 is a wiring diagram showing the control for
components in the wipe shoe.
In the combined wipe and stretch forming of stock 30 the traversing of the wipe shoe;
FIG. 3 is an enlarged fragmentary side elevation of a
onto aside face die, it has been found desirable to main;
part of the machine illustrated in‘ FIG. 1 and showing
tain the common. line of contact between the wipe form~
the wipe forming shoe, its support, and the sensing de
ing face of the shoe, the stock, and the side face of the
vices used in connection therewith;
die near to the normal instantaneous line of tan-gency of
FIG. 4 is a top plan View of the structure illustrated
the stock and die at all times. This normal instantane 35
in FIG. 3;
ous line of tangency is‘ that resulting from the tensioning
FIG. 5 is a view similar to FIG. 3, partly in vertical
of. the stock by the. stretch forming assemblage in the
section, illustrating the shoe with a modified form of
absence of any wiping operation.
,
In the use of circular dies concentric with the turn 40 the sensing device;
FIG. 6 is a top plan view of the structure illustrated
table; this normal line of tangency remains in ?xed posi
tion relative to the line of thrust of the wipe forming shoe
while‘ the shoe is held ?xedly in non-traversing position.
in FIG. 5;
FIG. 7 is a fragmentary top plan view of the shoe
illustrating another modi?cation of the sensing device
However, in cases wherein the radius of the curvilinear .
used in connection with the present invention; and
ontlineof the die varies, orv the axis of a circular die is
FIG. 8 is a diagrammatic top plan view of the die and
offset from the table axis, the normal instantaneous point 45
shoe
showing the cooperation of the sensing devices and
of tangency shiftsor mignates endwise of the stock from
stock in different positions of the shoe along the stock
such-line of thrust as the table is rotated. Sometimes the
and relative to the die face.
migration is quite rapid and extensive. This is true par
Referring ?rst to FIG. '1, the machine shown by way
ticularly when the stock passes from a relatively sharply
curved. portion of the die face onto a face portion that 50 of illustration is that disclosed in the Dolney and Hein
patent, No. 2,810,431, issued October 22, 1957, the op
is relatively flat or only slightly curved.
eration thereof, aside from the control of the traversing
Since the position of the normal instantaneous line of
of the shoe and the shoe and its sensing devices, being
tangency migrates rapidly in such cases, it is necessary
apparent from the patent.
totraverse the wipe shoe generally lengthwise of the side
Brie?y, the machine comprises a frame 1 on‘ which is
face of the die, in a direction generally toward the stretch 55
rotatably mounted a turntable 2 which may be driven
by means of a ring gear 3‘ and pinion gear 4. The pin-ion
gear is driven by ‘a hydraulic motor 5 to which ?uid pres
sure is supplied by a pump 6 driven by an electric motor
taot of the wipe shoe with the stock and die ‘lead or lag 60 7. The conventional controls can be used for controlling
the speed and direction of rotation of the table.
the normal instantaneous point of tangency to a limited?
Mounted on the frame 1 in spaced relation to the table
extent, so as to slightly understress or overstress the
is a support 8 which is rotatable or oscillatable about
stock, or to cause other specialized effects. This lead or
an upright pedestal 9 and which, in turn, supports a
forming. assembly so as to maintain the line of contact of
the shoe with‘ the stock at or close to the normal instan
taneous line of tangen'cy.
It is‘ desired‘ in some operations that the line of con
lag’ generally is not great, and can be deliberately intro
65 stretch forming piston and cylinder assemblage 10 com—
duced and controlled, as desired.
prising a piston 11 and a cylinder 12. The assemblage
Hereinafter, the normal instantaneous line of tan
is reversible and operating pressure ?uid is supplied there
gency designates that line‘ of- tan-gency of the stock ‘and
to through a suitable reversing valve 13 to which pres
die‘ that occurs- at a given instant inv the absence of the
sure ?uid is supplied by a pump 14 driven by a motor 15.
application. of the wipe forming shoe to the stock and
Mounted on the support 8 for movement endwise there
while the stock is being‘ applied to the 'die face solely 70 of is a suitable slide 16 which is connected to the rod 17
of- the piston. The slide 16 carries a stretch forming grip
by rotation. of the table and. under stretch forming ten-l
3,096,806
3
head 18 which is connected to one end of the stock mem
ber 19 which is to be formed about the side face of
the die.
A side face ‘die 25 is mounted on the table 2 for rota
tion therewith ‘and has a curvilinear side'face. A clamp
26 is secured on the die or table for rotation in ?xed
position relative to the die and is in clamping engagement
with the opposite end of the stock member 19 and con
4
portion 60 thereon, is exposed in position to engage the
side face of the die. ‘Carried by the block 62 are two
sensing devices which, in the form illustrated in FIGS. 1
through 3, are metallic electrical contact pins 63 ‘and 64.
These contact pins are spaced at opposite ends, in the
direction lengthwise of the stock, of the portion 60. The
forward faces of the pins 63 ‘and 64 may be ?ush with
the forward face of the block 62, or may extend a slight
nects it for rotation with the die. Thus, by driving the
distance forwardly therefrom. Generally, when the shoe
table in the direction indicated by the arrow in FIG. 1, 10 is applied to the stock to press the stock against the die,
with tone end of the stock member 19 clamped at 26 and
the face portion 60 of the shoe is tangent to the die face
the other end clamped by the gripping head 18, the stock
and the stock curves away from the contact portion 60
member 19 is stretch formed about the side face of the
die 25 progressively as the table rotates.
of the shoe both forwardly and rearwardly in the direc
tion \of wiping along the stock. The pins 63 and 64
For combined wipe and stretch forming, a traversing
wipe forming mechanism is provided. This mechanism
comprises a wipe shoe 30 mounted on a pedestal 31 of a
slide 32 which is slidable in suitable guideways 33 toward
and away from the side face of the die. The guides are
mounted on a traversing carriage 34.
Also mounted on the carriage 34 is a reversible wipe
are inactive to perform any function when not engaged
with the stock 19.
In the form illustrated, they are connected to, and form
part of, suitable control means. The control means com
prises a pair of relays, indicated at 68 and 69, respec
tive-ly, as shown in FIG. 1. As illustrated in FIG. 2, the
relay 68 ‘has a pair of normally open contacts 68:: and
forming piston and cylinder assemblage 35, including a
68b and a normally closed contact 630. The relay 69
cylinder 36 and a piston 37 having ‘a rod 38. The rod 38
has a pair of normally open contacts 69a and 69b and
is connected to the pedestal 31 for applying the wipe form
normally closed contact 69c. In order to energize and
ing pressure to the shoe. Pressure ?uid is supplied to the 25 deener-gize the relays 68 and 69, one terminal of each
assemblage 35 through ‘a suitable reversing valve 39 to
of the relays is connected to one line 70 of a 12-volt cir
which ?uid pressure is supplied, in turn, rby a pump 40
cuit energized by a transformer 71. The other line 72 of
driven by a motor 41.
the lZ-Volt circuit is connected to ground. The other
The traversing carriage 34, in turn, is mounted on a
terminal of the relay 68 is connected to the contact 63.
guideway 45 extending generally endwise of the length 30 The terminal relay 69 is connected to the contact 64.
of stock. In the form illustrated, the guideway 45 is
Usually, the side face die is metal and, of course, the
lineal.
stock to ‘be formed is metal. Consequently, the die or
In order to traverse the carriage 34, power means in
the stock also is connected to ground. This may be done
the form of ?uid pressure operated reversible piston and
by connecting the die to ground, or by connecting some
cylinder assemblage 46 are provided. This assemblage 35 part of the piston and cylinder assemblage 10, or the grip
includes a cylinder 47 and a piston 48 having a rod 49
head 18, or the stock 19 itself, to ground.
which is connected to the carriage 34. Pressure ?uid for
Generally, the contacts 63 and 64 are arranged to en
operating the ‘assemblage 46 is supplied through a suit
gage and disengage the stock itself, but, if desired, they
able reversing valve 56 which is operated, in turn, by
may be arranged to engage and disengage a portion of
solenoids 51 and 52. The pressure ?uid is supplied to the 40 the side face, for example at one edge of the stock, as
valve 50 by a pump 53 driven by ‘a suitable motor 54.
the shape of the die face to a large extent dictates and
By selective operation of the solenoids 51 and 52, the
controls the position of the tensioned stock. However, the
valve 50 can be operated to cause the traversing carriage,
best result is obtained by engaging the stock itself with
‘and thereby the shoe 30, to move forwardly and rear
the contacts, as the engaged location on the stock at the
wardly alongside the side face of the die. When the
forward end of the shoe in the direction lengthwise 0f
table is rotating as illustrated in FIG. 1, the forward 45 the side face sometimes is not in contact with the face
direction is opposite to the direction of rotation of the
of the die.
table and the reverse ‘or rear direction is the same as the
' With the wipe shoe in the position illustrated in FIG.
rotation of the table.
:1, neither of the contacts 63 or 64 engages the stock.
The structure thus far described is of the general type
Therefore, the two relays are unenergized. However,
shown in the above Dolney and Hein patent. However, 50 should an elongated portion of the side face of the die
‘as mentioned hereinbefore, it is desirable that the contact
having much less curvature, as indicated at X in FIG. I,
surface portion of the wipe shoe 30' be maintained nor
approach the predetermined instantaneous line of con
mally at the predetermined instantaneous line of contact
tact of the wipe forming shoe with the stock, the stock
of the stock member and the side face of the die during
would be moved toward the shoe in the direction of ap
rotation of the table.
55 plied wiping pressure and eventually engage the contact
In order to maintain the shoe in the proper position
63. Upon ‘the making of contact between the contact
‘along the die face so that this line of contact does not
63 and the stock, the relay 68 is energized by the electrical
exceed a predetermined maxi-mum distance in ‘advance
or to the rear of the normal instantaneous line of tan
signal resulting from closing the circuit. This energiza
tion operates the relay 63 so as to cause it to operate the
gency, the wipe shoe is provided with vsuitable sensing de 60
valve '50 so that the valve, in turn, causes the traversing
vices to which a control of the valve 50 of the assem
assemblage 56 to move the carrier 34, and thereby the
blage 46 is responsive. As best illustrated in FIG. 4, the
shoe
30, in the forward direction, this being the direction
‘wipe shoe has a contact portion, indicated at 6%), which
opposite to the direction of rotation of the table. The
generally is near the center of the shoe in a ‘direction end
wise of the stock and side face of the die. The forward 65 shoe continues traversing forwardly until it reaches a loca
tion at which the contact 63 breaks contact with the
vface of the shoe generally is lineal in ‘a direction endwise
of the stock. As a result, when the central or contact
stock, at which location the wiping surface of the shoe
portion 60 is in the position in which it normally engages
the stock and presses it against the die, the face portions
portion X is of great enough extent and sufficiently ?at,
is at the instantaneous line of contact.
If the ?attened
of the shoe near its ends are spaced from the face of the 70 the contact 64 also will be brought into contact with the
stock 19.
stock. Thus both the relays 69 and 68 will be energized
The vshoe preferably is in the form of a rigid metal
concurrently. As will later be explained, the circuit is
frame 61 in which is carried, in ?xed position, a suitable
such that, when both relays 68 and 69 are energized, the
wiping block 62 of nylon or other suitable material. The
valve 50 will be operated to ‘cause the assemblage 46 to
block 62 is arranged so that its forward face, with the 75 continue moving the table 34 in the forward direction.
3,096,806
5
Again, this forward direction of movement continues
until the contact 63 leaves the stock, in which case only
the contact 64 remains in contact. When the contact 63
6
cuit and hence the shoe continues to- move forwardly un
til the contact is broken between the contact ‘63?; to stop
the forward traversing movement. The contact’ 64i-‘is
piston and cylinder assemblage 46 to reverse traversing
still in contact with the stock. Hence, only therrelayi69
is energized. In this condition, normally closed- contact
680 remains closed and the normally open contact-69b
is closed, thus energizing the solenoid-'52. As a‘result",
direction of the carriage 34- and shoe 30; This reversal
continues until either the contact 64 leaves the stock and
table, and thereby the shoe 30, to be traversed‘ in the
leaves the stock, the relay '68 is deenergized but the relay
69 remains energized. Energization of the relay 69‘ alone,
however, causes the valve 50 to be set to operate the
the solenoid 52 operates the valve 50 so as to‘ cause the
breaks con-tact therewith, or until the contact 63 again 10 reverse direction or inthe direction of table travel. Such
reverse traverse continues while only the contact 64* is
engages the stock. In the former case, the reverse traverse
still in contact, but it eventually causes‘ contact 63 ‘to re=
of. the shoe temporarily ceases. In the latter case, it
turn into contact. If both contacts 63 and 64' are out of
ceases in the reverse direction and immediately begins in
the forward direction.
contact, the shoe stops.
If bot-h are brought into con
Different degrees of sensitivity and different maximum 15 tact, the shoe immediately starts again and traverses in
the forward direction. If only contact 64 is' in contact;
limits can be established by preselecting the position of
the shoe traverses rearwardly.
the contacts 63 and 64 with respect to each other and the
Thus, the shoe hunts and ?nds itself in the proper pre
distance of each forwardly and rearwardly, lengthwise of
determined instantaneous contact position atv all times.
the side face, from the contact portion 60. It is to be
The sensing devices thus provided, and‘ the control
understood that the contacts do not have to be equidistant 20
means associated therewith, are relatively simple and com
from this portion.
pact and noteasily damaged. However, other controls
Referring next to FIG. 2, the wiring diagram is shown
may be used. For instance, as illustrated in FIGS. 5
indicating the coaction of the contacts of the relays with
and 6, a shoe Si) is illustrated which is the same as the
the solenoids 51 and 52 for operating the valve 50‘ to pro
vide the traverse operations described. The solenoid 51 25 shoe 3t} heretofore described, except for the sensing de
vices themselves. In this form, the shoe includes a suitable
is operative when energized to cause traversing of the
nylon or insulating block '81 in which are mounted pressure
shoe in the forward direction, which is opposite to the
transmitting pins 82. Mounted on' the shoe are two
direction of rotation of the table. The solenoid 52 is
micro-switches
83 and‘ 84 which are of the self~restorilng
operative when energized to cause traversing of the wipe
shoe in a reverse direction, which is in the direction of 30 type. Thrust transmitted‘ by the pins 82 need bev very
slight to operate the switches, and hence the pins may
rotation of the table. For this purpose, the solenoid 51
be mounted for sliding movement in the block' 81’, or
has one terminal connected to line L1 to a suitable 110‘
may be bonded thereto and moved due to elastic de
volt source. The opposite terminal of the solenoid '51 is
formation of the block. These pins operate the micro
connected to the line L2 of the opposite side of the 110
volt source. The normally open contact 68b and the 35 switches to make contact when pressure is applied‘ to
them, so that the micro-switches operate essentially in
normally closed contact 69c are connected in the series
the same manner as the contacts 63 and‘ 64 and' are
between the solenoid 51 and the line L2. The solenoid
similarly connected in the circuit. Obviously, the circuit
52 has one terminal connected to the line L1 and the op
may
be a two-wire circuit rather‘ than a. grounded circuit,
posite terminal connected to line L2 with the normally 40
if desired.
closed con-tact 68c and the normally open contact 6%
Again, as illustrated in FIG. 7, instead of micro
interposed, in series with each other, between the latter
switches,
the sensing means may be switches in the form
terminal and the line L2. A bypass circuit is arranged in
of strain ‘gauges. As illustrated in FIG. 7, the'shoe 90
bypassing relation to the contacts 68b and 690. This by
includes a block 911 to which are a?ixed' strain gauges 92
pass circuit is connected at one end to the latter terminal
45 and 93. These gauges, as is disclosed in the U.S. Patent
of the solenoid v51 at- a location between the latter ter
No. 2,849,048, issued August 26, 195-8, respond to‘ ‘the
minal and the contacts 68b and 690. The other terminal
elastic deformation of the block'90 at their locations and
of the bypass circuit is connected to the line L2. Inter
produce an electrical signal in response to that deforma
posed in the bypass circuit in series with each other are
tion. These signals are used in the same manner as the
the normally open contact 68a and the normally open 50 signals from the contacts 63 and 64, or switches *83 and
contact 69a.
84, heretofore described, but, if course, an ampli?er is
The operations above described are obtained with the
required in the circuit to amplify the signal current sup
circuit described. For example, when the contacts 63
plied by the patches before delivering it to the relays‘.
and 64 are out of contact with the stock, no power is
The contacts illustrated in FIGS. 1 through'3 are pre
supplied to either relay, due to the normally open con 55 ferred so that the shoe can operate on only a light feather
tacts 69b, 68b and 68a and 69a. When contact 63 makes
touch.
contact with the stock energizing the relay 68, the nor
The shoe can be of the sliding or rolling type and, if
mally closed contact 680 opens so that no power can
of the rolling type, the sensing means, are. positioned on
reach the solenoid 52. Likewise, the normally open con
the shoe forwardly or rearwardly of the roll..
tacts 68a and 68b close, and the solenoid 51 is energized 60
Referring to FIG. 8, a die D, having a side face with
through the normally ‘closed contact 69c and the now
shanp and ?at curves, is illustrated and the shoe 30 is
closed contact 68b. Further, a standby circuit is par
shown in different wiping positions. therealong. I'n p07
tially established through the now closed normally open
sition A, neither contact 63 or 64’ is engaging the stock,
contact ‘63a. With the solenoid 51 thus energized, the
so the shoe remains in a ?xed traversed position. As
shoe traverses forwardly opposite to the direction of 65 the die swings to the right so that the shoe is at position
rotation of the table until the contact 63 again breaks
B, contact 63 makes contact. Immediately, the shoe
contact. During this traverse, the contact 64 engages the
traverses to the left, contact 63 remaining in contact.
stock and thereby energizes the relay 69 so that both relays
When it reaches position C, both contacts .63 and 64 are
are in energized condition concurrently. This closes con
in contact and left or forward travel continues.v When
tactwb, but, on the other hand, opens contact 68c so that 70 it. reaches position D, contact 63 has broken contact but
the relay 52 is not energized. Further, while it closes
contact 64 remains in contact. The shoe has over-run
contact 68b, it opens contact 690, so that the solenoid 51
slightly. Thereupon, due to contact l64, the shoe traverses
cannot be energized through its normal circuit. However,
to the right until contact 63 is again in contact, whene
upon the shoe starts forward again. Thus, the shoe hunts
it closes contacts 68a and ‘69a in the bypass circuit so
that the solenoid 51 is energized through the bypass cir 75 and maintains its proper position. There is inherently
3,096,806
8
a slight time delay in operation of the assemblage 46, so
3. A machine according to claim 1 wherein the devices
that the hunting is not a rapid to and fro weaving but
almost a constant forward movement with occasional
slight hesitation or reverse movement.
are electric switches.
4. A machine according to claim 1 ‘wherein the devices
are adapted to be operated by contact with the surface of
It is apparent, therefore, ‘from the foregoing descrip
the stock member.
tion, that during the combined wipe and stretch forming
5. A machine according to claim 1 wherein the devices
operation, the traversing wipe shoe is controlled auto
are switch devices having electrical contacts with por
matically so as to maintain its preselected point of con
tions disposed for direct electrical contact with, and dis—
tact with the stock at all times within the limits selected
engagement from, the stock member, circuit means con
relative to the normal instantaneous line of tangency of 10 nect the contacts electrically with the control means, and
the stock and the die which would result were the wipe
the stock member is a conductor portion of the circuit
shoe not in contact. Thus, the Wiping is effected at the
preferred location.
6. A machine according to claim 1 wherein the de
Furthermore, the traversing can be so controlled that
vices are strain gauges on the shoe at spaced locations
a slight overstressin'g or understressing can be obtained, 15 endwise thereof and are rendered operative by elastic
if required, by causing the sensing means to apply the
deformation of the shoe at said locations, respectively.
shoe in a leading or lagging relation to the normal in
7. In a stretch forming machine, a power driven ro
stantaneous line of tangency.
tatable table, a side face die thereon and having a cur
Having thus described my invention, I claim:
vilinear side face, means for connecting one end of an
1. In a stretch forming machine, a power driven ro 20 elongated stock for rotation ‘with the die, power driven
tatable table, a side face die member thereon and having
stretch forming means adapted for connection to the
a curvilinear side face, means for connecting one end
other end of the stock for applying yieldable tension there
of an elongated stock member for rotation with the die,
to endwise thereof as the stock is wrapped on the die
power driven stretch forming means adapted for connec
by rotation of the table for stretch wrapping the stock
tion to the other end of the stock member for applying
onto the die face, a traversing Wipe shoe, power driven
yieldable tension thereto endwise thereof as the stock
wipe forming means for yieldably urging the shoe against
member is wrapped on the die member by rotation of the
the stock on said side face, traversing power means op
table for stretch wrapping the stock onto the die face, a
erable for traversing the shoe in opposite directions, se
traversing wipe shoe, power driven wipe forming means
lectively, endwise of said side face independently of ro
for yieldably urging the shoe against the stock member .30 tation of the table, said shoe having a normal contact
on said side face, traversing power means operable for
portion to be pressed against the stock and thereby press
traversing the shoe in opposite directions, selectively, end
the stock against the side face normally at that instanta
wise of said side face independently of rotation of the
neous line of tangency of the stock and side face of the
table, said shoe having a normal contact portion to be
die resulting from the stretch wrapping during rotation
pressed against the stock member and thereby press the
‘of the table, sensing means for sensing deviation of
means.
stock member against the side face normally at that in
said portions of the shoe from said instantaneous line
of tangency and including sensing devices spaced
apart from each other endwise of the wiping path
stantaneous line of tangency of the stock member and
side face of the die resulting from the stretch wrapping
during rotation of the ‘table, sensing means carried by
the shoe and including a pair of sensing devices on the
shoe and spaced from each other endwise of the wiping
path at opposite sides of said normal contact portion,
and operative, when both devices are spaced a predeter
‘
at opposite ends of said normal contact portion, said
devices being operatively connected to portions of the
stock at opposite sides of said instantaneous line of tan
gency, respectively, and each ‘device being rendered op
erative in response to positions of its associated stock
mined distance from the surface of one of the members,
portion in the direction of thrust of the wipe shoe for
to give a non-traverse signal, and ‘while one of the de :45 producing control signals, and operating means respon
a
vices nearest said other end of the stock and said surface
approach each other to a predetermined extent while the
other device remains a predetermined distance from said
surface to give a forward traverse signal, and when said
surface and both devices approach each other to a pre
determined extent to continue the ‘forward traverse signal,
and when said surface and said one of said devices re
cede from each other to a predetermined extent while
said other device remains in an approached position rela
tive to said surface, to give a reverse traverse signal, and 55
control means connected to the signal means for receiv
sive to the control signals to cause the traversing power
means to traverse the shoe in the direction for position
ing said normal contact portion at the instantaneous point
of tangency.
8. The structure according to claim 7 wherein the de
vices are electric switch means respectively and each de
vice is operable to close a circuit to the operating means
in response to predetermined positions of its associated
stock portion relative to the associated device in said
direction of thrust.
9. The structure according to claim 7 wherein the stock
forms a part of an electric control signal circuit, each
device has an electrical contact portion engageable with,
ing said signals and operatively connected to the travers
ing power means, and operative in the response to the
non-traverse signal, to cause the traversing power means
and disengageable from, its associated stock portion, de
to lock against traversing, and operative in response to 60 pending on said position of its stock portion in said di
the forward traverse signal to cause the traversing power
rection of thrust, and said control signals of each device
means to traverse the shoe toward said other end of
are due to the making and the breaking of the circuit,
the stock, and operative in response to the reverse traverse
respectively, by their associated electrical contact.
signal to cause the traversing power means to traverse
the shoe toward said one end of the stock.
65
References Cited in the ?le of this patent
2. A machine according to claim 1 wherein said normal
contact portion, in response to the signal means, seeks
a location adjacent the location of the instantaneous line
2,342,745
of tangency of which the stock member would have rela
tive to the die under the pull of the stretch ‘forming means 70 2,810,421
2,988,127
were the wipe shoe unapplied to the stock member at the
particular instant during stretch forming.
3,062,266
UNITED STATES PATENTS
Maize _______________ __ Feb. 29, 1944
Dolney et al ___________ __ Oct. 22, 1957
Gray a ______________ __ June 13, 1961
Abbott ______________ __ Nov. 6, 1962
Документ
Категория
Без категории
Просмотров
0
Размер файла
897 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа