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Патент USA US2412648

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Dec. 17, 1946.
G, H, RENDEL
2,412,648
AUTOMATIC POSITIONING AND WELDING
Filed July 1 ,I 1944
5 Sheets-Sheet l
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Dec. 17, 1946.
2,412,648
G_ H_ RENDEL
AUTOMATIC POSITIONING AND WELDING
Filed July 71, 1944
5 Sheets-Sheet 2
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Dec.‘ 17, 1946.
G. _H. RENDEL
2,412,648
AUTOMATIC POSITIONING AND WELDING
'
Filedv July 1, 1944
5 Sheets-Sheet 3
£25555.A.’ 85/1/0442,
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Dec. 17, 1946.
G, H_ RENDEL
2,412,648
AUTOMATIC POSITIONING AND WELDING
Filed July 1 , 1944
5 sheets-Sheet 4
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' G. H. RENDEL
AUTOMATIC POSITIONING AND WELDING
Filed July 1, 1944
5 Sheets-Sheet 5
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Patented Dec. 17, 1946
2,412,648
UNITED STATES PATENT OFFICE
2,412,643
AUTOMATIC POSITIONING AND WELDING
George H. Rendel, Mount Lebanon, Pa., assignor
to Carnegie-Illinois Steel Corporation, a corpo
ration of New Jersey
1
Application July 1, 1944, Serial N0. 543,135
20 Claims. (Cl. 219—4)
This invention relates to automatic position
ing and welding apparatus for welding strips
end to end in a continuous strip processing line.
In continuous strip processing lines such as elec
trotinning lines, it is necessary to weld or other
wise fasten the trailing end of one coil of strip
to the leading end of a succeeding coil of strip.
Such tinning lines may be divided into three
zones: zone 1 which includes the entering or
feeding equipment; zone 2 which includes the
various baths, plating and processing units; and
zone 3 where the coated strip is sheared, in
spected, classi?ed and piled. It is of utmost
importance that the equipment of zone 2 be oper
ated in such a manner as to maintain continuous
movement of the strip in order to secure uniform
pickling and plating.
Slack in the strip must be maintained in zone
1 in order to insure continuous operation through
zone 2 when starting a new coil. The over-all
time required to position new coils and weld the
strips end to end is governed to a great extent
by the skill of the operator in manipulating the
ends of the strips and the various electrical con
trols. This manual manipulation and welding
usually takes from 26 to 32 seconds, which means
that a large amount'of slack must be provided
in the strip and/or the speed of the ‘line must
2
after referring to the following speci?cation and
attached drawings, in which:
Figures 1 and 1A combined show an electrotin
ning line with which my invention is associated;
Figure 2 is a view showing the welding and
clamping apparatus;
Figure 3 is a, view taken on the line III——III of
Figure 2;
Figure 4 is an elevation showing the apparatus
for indicating the position of the strip;
Figure 5 is an end View of Figure 4; and
Figure 6 shows a schematic wiring diagram
for automatically positioning and welding the
strips end to end.
Referring more particularly to the drawings,
reference numeral 2 indicates a coil holder for
supporting a coil of strip S which is being con
tinuously electrotinned or otherwise processed.
The strip S passes from the coil holder 2 to a
shear 4 which is provided with pinch rolls 6
and a movable lower shear blade 8 which coop
erates with an intermediate shear blade to to
trim the leading and trailing edges of coils of
strip being unwound from the coil holder 2.
From here the strip passes through the welder i 2
to pinch rolls I 4, which feed the strip to the
looper pit i 6. A second coil holder I8 is mounted
adjacent the coil holder 2 and supports a coil
of strip S—| which is to be attached to the trail
be reduced greatly, otherwise the slack in the
strip will be exhausted before the strips are weld 30 ing edge of strip S. While the strip S is passing
ed end to end. The storage of such quantities
through the line, the strip S-i is mounted in
of strip presents problems in design and opera
coil holder 18 and passed through pinch rolls 2%
tion which are diiiicult to overcome without
and
its leading edge is trimmed between the up
greatly increasing the initial cost of installation.
per movable shear blade 22 and the intermediate
Reducing the speed to a great extent, decreases
shear blade Ill. The leading edge of the strip
both the quality and quantity of the coated strip
is then suspended against the top magnet 24 ad
and should be avoided. With the present inven
jacent the welder in readiness for quick handling
tion the time required for manipulation and
during positioning. When the strip S is entirely
‘ welding of the strips end to end has been re
unwound,
its trailing edge is cut off between the
duced so as not normally to exceed 15 seconds. 40
shear
blades
8 and Ill and the strip is moved into
It will be apparent that this reduction in the time
the desired position for welding by means of the
during which the strip in zone 1 is not being fed
pinch rolls 14. As best shown in Figure 2, the
to zone 2 requires less reduction in speed of the
welder i2 is provided with edge guides 26 for the
strip in zone 2 during welding of the strips end
strip being processed. Each of the guides is
to end.
45 mounted on wheels 28 and is moved on a track
It is an object of my invention to provide auto
30 by means of a cylinder 32 which is attached
matic means for performing a majority of the
to the guide by means of piston rod 34. The
operations in zone 1 so as to reduce the amount
weights 36, attached to the guide 25 by means
of the cable 38, draw the guide toward the edge
50 of the moving strip when air is exhausted from
Another object is to provide apparatus which
the cylinder 32. As the strip S passes through
will automatically position the end of a strip
the welder l2 it is stopped in the desired position
and indicate the position of the strip as it passes
by means of the pinch rolls l4. On the exit side
into welding position.
These and other objects will be more apparent 55 of the welder i2 is a stop bar 48, which is piv
otally mounted on the pins 4| which are attached
of time necessary for welding the strips end to
end.
2,412,643
i
3
to the ends of the idler roll (i2 and supported in
bearings 43. The stop bar 46 has a hollow por
tion lid to permit passage of the strip. The
stop bar 4% is attached to piston rod 46 and is
actuated by movement of the piston in cylinder
43. When the strip S has reached the desired
position, the stop bar iii} holds it in that position
as shown in Figure 3.
It will be seen that the
stop bar is provided with a surface 50 against
which the leading edge of the strip S-—I abuts.
When the strip S is positioned as shown, the
magnet 24 is deenergized and the strip S-I
placed with its leading edge against the surface
58 and the clamp 52 is lowered by opening valve
54 to admit fluid through pipe 56 to the top of
cylinders 58, the clamp 52 being attached to pis
ton rods til. After the strips S and S—I are
clamped between clamp 52 and the bottom elec
trode E2, the welding head 64 is lowered by ad
mitting air to the top 05 cylinder 66. The weld
ing head 64 carries circular electrodes 68 and a
contact wheel iii. The head traverse motor ‘12
moves the welding head 64 toward the strip un
til the wheel 'I'El contacts the strip. Meanwhile,
power is applied to the electrodes 68 and the for
ward movement of the welding head ‘carrying
the rotating electrodes continues until the two
strips are welded together. When the welding is
completed, all of the parts return to their nor
mal position.
‘
In order to accurately position the trailing
edge of the strip S there is mounted adjacent the
pinch rolls I4, a wheel ‘I4 which has a cable drum
'58 connected thereto for rotation therewith. A
cable ‘I8 is wound on the drum ‘It and has ias
tened to its lower end in any suitable manner a
weight 85. The wheel ‘Id is carried on an arm 82
which is pivotally mounted for movement with
4
mentarily energized closing contacts D—I and
scaling in the circuit to relay D through lines
H4, H6, H8, limit switch 98, line Ill], relay D,
lines I08, I06 and I64. Contact D-—3 is opened
and contacts D-—4 and De-S are closed, this clos
ing a separate power circuit (not shown) which
starts the pinch roll motor I26 and the sheared
end of the strip S is drawn forwardly through
the welder by means of the pinch rolls I4. The
closing of contact D—2 completes the circuit to
the strip positioning solenoid so through lines
Hi4, I06, I22, I24, H6 and H4. This swings the
wheel 14 into frictional contact with revolving
pinch roll I4 and as the wheel ‘I4 rotates, the
cable drum ‘I6 winds up cable ‘I8 to which is at
. tached the weight 89. The position of the moving
weight 80 indicates the position of the sheared
end of the strip S being drawn through the pinch
rolls I4. When the ascending weight strikes the
limit switch 96, it closes its normally open con
tacts, which completes the circuit to stop bar
relay J through lines H4, H2, I26, I23, closed
contact 1-1-2, lines I30 and I04. The closing
of contact J-—3 completes the circuit to solenoid
I32 through lines II4, I34, I36, I66 and I04. En
ergization of solenoid I32 operates valve 138,
which admits compressed air to stop bar cylinder
48 and exhausts air from guide cylinder 32.
When air is admitted to cylinder 48 the stop bar
40 descends toward the strip which is still moving.
When air is exhausted from cylinder 32, the
weight 36 draws the guides 26 toward the edge of
the moving strip. During this time interval, in
which the cylinders are in operation, weight 89
continues ascending until it ?nally strikes limit
switch 98 to open its normally closed contacts
and break the circuit to relay D whose associated
contact D—8 Will close and contacts D—4 and
D—E will open instantly to stop the pinch rolls
a shaft 84. An arm 86 is rigidly mounted on the
I4. The opening of contact D—I removes the
shaft 84 and is connected by means of a link 88 40 seal imposed on the circuit to relay D and the
to the solenoid 95. When the pinch rolls I4 are
started inorder to position the end of the strip
S, the wheel ‘i4 is swung into engagement with
the pinch rolls I4 by means of the solenoid 99,
this causing the weight 88 to move upwardly in
the guides 92. Supported on the guide bracket
94 are two limit switches 96 and 98 which are
adapted to be actuated by contact with the
beveled sides tilt of the weight 89. The position
of the weight 89 indicates the relative position
of the strip S.
The operation of the device is as follows:
When it is desired to weld the trailing end of
strip S to the leading edge of strip S-—I, the end
of the strip S-I is trimmed and held in position
by means of electromagnet 24 as previously de
scribed and in the position shown in Figure 1.
The entire line is then slowed down by means of
equipment which is not a part of this invention.
In most cases it is necessary to run at this reduced
speed in order to provide su?iicient time for posi
tioning and welding the strips together. The
pinch rolls i4 and uncoiler 2 are then stopped,
the accumulated strip in looper pit It being fed a
into zones 2 and 3 to keep the processing portion
opening of contact D—2 deenergizes solenoid 96,
causing the wheel ‘M to be retracted from contact
with the pinch roll I4. The weight 8!] immediate
ly descends to starting position. The devices and
circuits thus described are synchronized so as to
cause stop bar 4!] and guides 26 to arrive at their
respective locations with respect to the strip si
multaneously with the stopping of rolls Id. The
sheared end of strip S is now held ?rmly in posi
tion in the welder I2 by stop bar 48 which is lo
cated a sumcient distance from the end of the
strip to provide enough lap for proper welding.
Movement of the guide 2s is stopped since the
v guide has contacted the edge of the strip S. Both
guide and stop bar remain in their operative po
sition until completion of the welding operation,
since relay J is still energized. The closing of
contact J—Z seals the circuit to relay J around
the normally open contacts in switch 95, through
lines II4, I40, I26, I28, I36 and IM. The closing
of contact J—I sets up a circuit to clamp push
button I42, which is used to start the welding
operation described below.
The operator then steps on push button switch
I44, which deenergizes the magnet 24, by momen
of the line operating. The trailing end of strip
tarily breaking the circuit to normally energized
S is then out 01f between the shear blades 8 and
relay L. The operator now inserts the end of the
It. At this time the various parts of the machine
strip S—! into the welder against surface 50 of
and the electric circuit are in the positions shown
in Figure 1. The trailing edge of the strip S is 70 the stop bar 43 where it assumes a position in
lapped relationship to strip S with the edges of
then positioned as follows:
both strips evenly’ matched. The push‘ button
The push button I62 is depressed, this closing
switch I 42 is then closed to complete a circuit
the circuit to positioning relay D through lines
I84, I66, I118, relay D, line I Ill, push button switch - . to relay K through lines I04, I06, I46, closed con
I92, line H2 and line H4. The relay D is mo 75 tact J—i, lines I48, H2 and H4. The closing of
5
2,412,648
contact K-I seals the circuit to relay K through
lines H4, H5, I50, Hi8, closed contact J—I, lines
I46, IE6 and IE4. The closing of contact K—-2
6
the reverse direction, raising welding head I34.
Deenergization of relay K removes the seal
around push button I42, deenergizes, relay P and
clamp solenoid I52. Solenoid I52 operates valve
54 to admit air to cylinders 58, raising clamp 52.
head. The closing of contact K-3 completes the
Opening of contacts P—I and P-2 deenergizes
circuit to solenoid E52, through lines I M, H16,
relay T to stop forward travel of the welding head
I54, H8 and lid. Energization of solenoid I52
34. When clamp 52 is raised it actuates limit
operates an air valve 54‘ to admit air to clamp
cylinders 58 which lower clamp 52 against the 10 switch I56 to close contact I68, this completing
a circuit to relay E through lines I I4, I68, I96, I98
two strip ends positioned in the welder. As clamp
and H14. Closing of contacts E—I and E—2 per
52 descends, it strikes limit switch 25%, closing
mits operation of uncoilers 2 and I8 and pinch
contact I53 and opening contact 5%. Closing of
rolls I4. Closing of contact E—3 completes the
contact I58 completes the circuit to relay B
to relay F through lines H4, 200, 282 and
through lines H14, I52, its, normally closed con 15 circuit
I04. Closing of contact E--4 completes a circuit
tact H—I, lines let, IE3 and H4. The closing
to relay Q through lines I I4, 200, 204, limit switch
of contact B—I seals the circuit to relay J around
295,
lines 298, 2H), I82 and I04. When relay Q
contact H—2. The 016511110” of contact 13-2 closes
is energized, its contacts Q—I and Q-—2 complete
the circuit to relay A through lines I84, Illl, I12
the circuit to reversing relay B through lines I 04,
and H13, this closing contacts A—! and A—2,
I82, 2m, 2I2 and H4. Energization of relay R
which completes a circuit to relay C and solenoid
closes
the contacts R-I, R—2 and R-S to apply
I74, through lines I563, H6, I78 and IE4. Solenoid
power to the welding head traverse motor which
sets up a circuit between contact C—~2 and relay
P for forward travel of the motor driven welding
I14 operates an air valve I86 to admit air to a
cylinder 66, which lowers welding head St to
which is attached the circular electrodes 68 and
contact wheel in. The opening of contact I69
breaks the circuit to normally energized relay E,
which becomes deenergized with all of its con
tacts opening. The opening of contacts E—-I and
E-Z breaks the power circuit (not shown) to the u
pinch roll motor 1% and the uncoilers 2 and I8
rendering them inoperative during the welding
starts reverse travel of the welding head 64. This
is interrupted when the head strikes limit switch
2%, opening its contacts, thus deenergizing relay
Q, which in turn deenergizes relay R and stops
the traverse motor ‘I2.
As mentioned above, relay F is now energized
its contact F-Z will complete a circuit to
relay H through lines I04, I82, 2I4, 256, H8 and
III}. Opening of contact F—I is delayed long
Energization
enough to permit relays in the power circuit (not
shown) to function to restart equipment in zone
1. At this point, the entire line will now be op
erating at a reduced speed. To increase the op
of relay C, described above, opens normally closed
contact C-I, but the opening is delayed long
controls that are provided for this purpose, but
operation. The opening of contact E—3 deener
gizes normally energized relay F and the opening
of contact lit-4 prevents operation of the welding
head motor ‘I2 in reverse direction.
ing speed to normal, the operator operates
not a part of this invention.
(
enough to provide sufficient time for wheel ‘IE to
When it is desired to weld a strip to the end of
contact the strip after the welding head forward ell)
strip 8-1, a coil of strip is placed in the uncoiler
travel is started. The closing of contact C—2
2 and its leading edge is trimmed between shear
completes a circuit to relay P through lines I64,
blades 8 and Ill and the end held by magnet 2I8.
I82, 58d, closed contact K-Z, lines tut‘, H5 and
The operation described above is then repeated
H4.
with strip S—-l being the leading strip and the
The closing of contacts P-—I and P—2 com
strip supported on uncoiler 2 being the trailing
pletes the circuit to relay T through lines II 4,
strip,
I88, I96, 582 and IE4. This closes contacts T-—I,
While one embodiment of the invention has
T-2 and T-S to apply power to the head trav
been shown and described, it will be apparent
erse motor ‘i2, which drives the welding head 64
that other adaptations and modi?cations may be
toward the strip. When the head travels far
made
without departing from the scope of the
enough, wheel ‘in vcontacts the strip and completes
following claims.
the circuit to relay G through the primary wind
I claim:
ing of a 24. volt transformer 1592 to ground 5%.
1. Strip positioning apparatus for strip process
The closing of contact G—l> insures energization
ing lines comprising a rotatable roll for drawing
of relay 33 until contact I58 of limit switch £56
the strip through the line, means for rotating said
is opened when clamp 52 is raised. The closing
roll,
means for actuating said rotating means, a
of contact G-—2 closes an internal electrode ?ring
wheel adapted to be swung into contact with said
circuit (not shown) in the welder and power is
roll by said actuating means, a cable drum
applied to the electrodes E5. As the head 84
mounted for rotation with said wheel, a cable
continues its forward travel across the entire
"width of the clamped together strips, they are 60 wound on said drum, a weight on the lower end of
said cable, the position of said weight indicating
welded together by the rotating electrodes 68.
the relative position of said strip, and means ac
When welding has been completed and wheel
tuated by said weight for stopping the rotation of
‘It breaks contact with the strip, all the various
said roll when the strip has reached the desired
parts are returned to normal position as follows.
position.
Relay G is deenergized, this deenergizing relay B
2. Strip positioning apparatus for strip process
and breaking the power circuit to the electrodes
ing
lines comprising a rotatable roll for drawing
58. Deenergization of relay 3 deenergizes relays
the strip through the line, means for rotating said
A and J. The deenergization of relay J opens
roll, means for actuating said rotating means, a
the circuit to solenoid E32 and actuates valve I28
wheel adapted to be swung into contact with said
to admit air to cylinders 32 and 48 reversing their
roll by said actuating means, a cable drum
action and causing the guides 23 and stop bar 48
mounted for rotation with said wheel, a cable
to return to their normal positions. Deenergiza
wound on said drum, a weight on the lower end of
tion of relay A deenergizes solenoid H4 and tim~
said
cable, the position of said weight indicating
ing relay C. Solenoid I'I4 operates cylinder 55 in
the relative position of said strip, a movable stop
2,412,648
7
8
to the completion of the welding operation to open
the power circuit and raise the welding head,
‘bar for holding the strip in its desired position,
and means actuated by said weight for moving
said stop bar to its operative position and stopping
the rotation of said roll when the strip has reached
its desired position.
3. Strip positioning apparatus for strip process
ing lines comprising a rotatable roll for drawing
the strip through the line, means for rotating said
means to reverse the movement of the welding
head, and a limit switch actuated by the welding
head on reverse movement thereof to stop its
movement.
.
8. Apparatus for welding strips end to end in
continuous strip processing lines comprising a
clamp for holding the strips in position to be
roll, means for actuating said rotating means, a
wheel adapted to be swung into contact with said 10 welded, means for moving the clamp into opera
tive position, a movable welding head, an elec
roll by said actuating means, a cable drum
trode mounted on said welding head, means ac
mounted for rotation with said wheel, a cable
tuated by movement of said clamp into operative
wound on said drum, a weight on the lower end of
position to move the electrode into contact with
said cable, the position of said weight indicating
said strips and to supply power to the electrode,
the relative position of said strip, a movable stop
means to open the power circuit and to raise the
bar for holding the strip in its desired position,
clamp and welding head, automatic means for re
means actuated by said weight for moving said
versing the movement of the welding head upon
stop bar toward its operative position, and means
completion of the welding operation, and a limit
actuated by continued movement of said weight
switch actuated by the welding head on reverse
to stop the rotation of said roll and move said
movement thereof to stop its movement.
wheel out of contact therewith when the strip
9. Apparatus for welding strips end to end in
has reached its desired position.
continuous strip processing lines comprising a
4. Strip positioning apparatus for strip process
clamp for holding the strips in position to be
ing lines comprising a rotatable roll for drawing
welded, means for moving the clamp into opera
the strip through the line, means for rotating
tive position, a movable welding head, an elec
said roll, means for actuating said rotating means,
a wheel adapted to be swung into contact with
saidv roll by said actuating means, a cable drum
mounted for rotation with said wheel, a cable
wound onsaid drum, a weight on the lower end of 30
said cable, the position of said weight indicating
the relative position of said strip, a limit switch,
a movable stop bar for holding the strip in its de
sired position, said switch being actuated by said
weight to actuate said stop bar toward operative
position, a second limit switch actuated by said
weight on continued movement thereof to stop the
rotation of said roll and to move said wheel out
of contact therewith.
5. Strip positioning apparatus for strip process
ing lines comprising a rotatable roll for drawing
the strip through the line, means for rotating said
roll, means for actuating said rotating means, a
wheel adapted to be swung into contact with said
roll by said actuating means, a cable drum
mounted for rotation with said wheel, a cable
wound on said drum, a weight on the lower end of
said cable, the position of said weight indicating
the relative position O-f said strip, a limit switch,
a movable stop bar for holding the strip in its de- ,
sired position, movable edge guides for said strip,
said switch being actuated by said weight to move
said step bar and guides toward operative position,
trode mounted on said welding head, means ac
tuated by movement of said clamp into operative
position to move the electrode into contact with
said strips and to supply power to the electrode,
means to open the power circuit and to raise the
clamp and welding head, means actuated by up
ward movement of the clamp to reverse the move
ment of the welding head, and a limit switch ac
tuated by the welding head on reverse movement
thereof to stop its movement.
10. Apparatus for welding strips end to end in
continuous strip processing lines comprising a
clamp for holding the strips in position to be
welded, means for moving the clamp into opera
tive position, a movable Welding head, an elec
trode mounted on said welding head, means ac
tuated by movement of said clamp into operative
position to move the electrode into contact with
a said strips and to supply power to the electrode,
means responsive to the completion of the weld
ing operation to open the power circuit and to
raise the clamp and welding head, means actu
ated by upward movement of the clamp to reverse
the movement of the Welding head, and a limit
switch actuated by the welding head on reverse
movement thereof to stop its movement.
11. Apparatus for positioning and welding
6. Strip positioning apparatus for strip process
strips end to end in a continuous strip processing
line comprising a rotatable roll fOr drawing the
leading strip through the line, means for rotating
said roll, means for actuating said rotating means,
means operable by the actuating means to indi
cate the position of said strip, a movable stop bar
plying power to the electrode, means responsive
indicate the position of said strip, a movable stop
a second limit switch actuated by said weight on
continued movement thereof to stop the rotation
of said roll and to move said wheel out of contact
therewith when the strip has reached its desired
position.
for holding the strip in the welding position,
ing lines comprising a rotatable roll for drawing
means actuated by said indicating means for mov
the strip through the line, means for rotating said
ing said stop bar to its operative position and
roll, means for actuating said rotating means,
stopping the rotation of said roll when the strip
means operable by the actuating means to indi
has reached the welding position, manually oper
cate the position of said strip, a movable stop bar
able means for positioning the leading edge of the
for holding the strip in its desired position, and
trailing strip against the stop bar in welding po
means actuated by said indicating means for mov
sition, and means for welding the strips end to
ing said stop bar to its operative position and
end.
stopping the rotation of said roll when the strip
12. Apparatus for positioning and welding
has reached its desired position.
7. Apparatus for welding strips end to end in 70 strips end to end in a continuous strip processing
line comprising a rotatable roll for drawing the
continuous strip processing lines comprising a
leading strip through the line, means for rotating
movable welding head, an electrode mounted on
said roll, means for actuating said rotating
said welding head, means for moving the elec
means, means operable by the actuating means to
trode into contact with said strips and for sup
2,412,648
1.0
bar for holding the strip in the welding position,
means: actuated by said indicating means for
moving said stop bar to its operative position and
stopping the rotation of said roll when the strip
has reached the welding position, manually op
drum mounted for rotation with said wheel, a
cable wound on said drum, a weight on the lower
end of said cable, the position of said weight indi
cating the relative position of said strip, a mov
able stop bar for holding the strip in the welding
position, means actuated by said weight for mov
ing said stop bar to its operative position and
stopping the rotation of said roll when the strip
has reached the welding position, manually oper
erable means for positioning the leading edge of
the trailing strip against the stop bar in welding
position, a clamp for holding the strips in posi
tion to be welded, means‘ for moving the clamp
into operative position, a movable welding head,
. able means for positioning the leading edge of
an electrode mounted on said welding head,
means actuated by movement of said clamp into
operative position to move the electrode into con
tact with said strips and supply power to the
electrode, means to open the power circuit and an Ll '
the trailing strip against the stop bar in weld
ing position, and means for welding the strips
means for reversing the movement of the weld
ing head upon completion of the welding opera
tion, and a limit switch actuated by the welding
ing strip through the line, means for rotating
said roll, means for actuating said rotating
raise the clamp and welding head, automatic
head on reverse movement thereof to stop its '
movement.
13. Apparatus for positioning and welding
strips end to end in a continuous strip processing
line comprising a rotatable roll for drawing the
leading’ strip through the line, means for ro
tating said roll; means for actuating said rotating
means, a wheel adapted to be swung into contact
with said roll by said actuating means, a cable
drum mounted for‘ rotation with said wheel, a
cable wound on said drum, a weight On the lower 1
end of said cable, the position of said weight in~
dicating the relative position of said strip, means
actuated by said weight for stopping the rota
tion of said roll when the strip has reached the
welding position, manually operable means for I
positioning the leading edge of the trailing strip
on the trailing edge of the leadin<y strip in Weld
ing position, and means for welding the strips
end to end.
end to end.
16. Apparatus for positioning and welding strip
end to end in a continuous strip processing line
comprising a rotatable roll for drawing the lead
means, a wheel adapted to be swung into contact
with said roll by said actuating means, a cable
drum mounted for rotation with said wheel, a
cable wound on said drum, a weight on the lower
end of said cable, the position of said weight indi
cating the relative position of said strip, a mov
able stop bar for holding the strip in the welding
position, means actuated by said weight for mov
ing said stop bar to its operative position and
stopping the rotation of said roll when the strip
has reached the welding position, manually oper
able means for positioning the leading edge of
the trailing strip against the stop bar in welding
position, a clamp for holding the strips in posi
tion to be welded, means for moving the clamp
into operative position, a movable welding head,
an electrode mounted on said welding head,
means actuated by movement of said clamp into
operative position to move the electrode into con
tact with said strips and supply power to the
electrode, means to open the power circuit and
14. Apparatus for positioning and welding 4-; raise the clamp and welding head, automatic
strips end to end in a continuous strip processing
means for reversing the movement of the weld
line comprising a rotatable roll for drawing the
ing head upon completion of the welding opera
leading strip through the line, means for rotat
tion, and a limit switch actuated by the welding
ing said roll, means for actuating said rotating
head on reverse movement thereof to stop-its
means, a wheel adapted to be swung into contact 45 movement.
with said roll by said actuating means, a cable
17. Apparatus for positioning and welding
drum mounted for rotation with said wheel, a
strips end to end in a continuous strip processing
cable wound on said drum, a weight on the lower
line comprising a rotatable roll for drawing the
end of said cable, the position of said weight in~
leading strip through the line, means for rotating
dicating the relative position of said strip, means
said roll, means for actuating said rotating
actuated by said weight for stopping the rotation
means, means operable by the actuating means to
of said roll when the strip has reached the weld
indicate the position of said strip, a movable stop
ing position, manually operable means for posi
bar for holding the strip in the welding position,
tioning the leading edge of the trailing strip on
means actuated by said indicating means for
the trailing edge of the leading strip in welding . moving said stop bar to its operative position and
position, a clamp for holding the strips in position
stopping the rotation of said roll when the strip
to be welded, means for moving the clamp into
has reached the welding position, manually oper
operative position, a movable welding head, an
able means for positioning the leading edge of
electrode mounted on said welding head, means
the trailing strip against the stop bar in welding
actuated by movement of said clamp into opera iii) position, a movable welding head, an electrode
tive position to move the electrode into Contact
mounted on said welding head, means for moving
with said strips and supply power to the electrode,
the electrode into contact with said strips and
means to open the power circuit and raise the
for supplying power to the electrode, means re
clamp and welding head, automatic means for re
sponsive to the completion of the welding opera
versing the movement of the welding head upon
tion to open the power circuit, to return the stop
completion of the welding operation, and a limit
bar to its inoperative position and raise the weld
switch actuated by the welding head on reverse
ing head, means to reverse the movement of the
movement thereof to stop its movement.
welding
head, and a limit switch actuated by the
15. Apparatus for positioning and welding strip
end to end in a continuous strip processing line
comprising a rotatable roll for drawing the lead
ing strip through the line, means for rotating
said roll, means for actuating said rotating
means, a wheel adapted to be swung into contact
with said roll by said actuating means, a cable
welding head on reverse movement thereof to
stop its movement and to rotate said rotatable
roll.
18. Apparatus for positioning and welding
strips end to end in a continuous strip processing
line comprising a rotatable roll for drawing the
leading strip through the line, means for rotating
2,412,648
11
12
said roll, means for actuating said rotating
to its inoperative position and raise the welding
means, a wheel adapted to be swung into contact
with said roll by said actuating means, a cable
welding head, and a limit switch actuated by the
head, means to reverse the movement of the
drum mounted for rotation with said wheel,'a
welding head on reverse movement thereof to
cable wound on said drum, a weight on the lower
stop its movement and to rotate said rotatable
roll.
20. Apparatus for positioning and welding
strips end to end in a continuous strip processing
end of said cable, the position of said weight in
dicating the relative position of said strip, means
actuated by said weight for stopping the rotation
of said roll when the strip has reached the weld
line comprising a rotatable roll for drawing the
ing position, manually operable means for posi 10 strip through the line, means for rotating said
.roll, means for actuating said rotating means, a
tioning the leading edge of the trailing strip on
wheel adapted to be swung into contact with said
the trailing edge of the leading strip in welding
roll by said actuating means, a cable drum
position, a movable welding head, an electrode
mounted for rotation with said wheel, a cable
mounted on said welding head, means for moving
the electrode into contact with said strips and for 15 wound on said drum, a weight on the lower end
of said cable, the position of said weight indi
supplying power to the electrode, means respon
cating the relative position of said strip, a limit
sive to the completion of the Welding operation
switch, a movable stop bar for holding the strip
to open the power circuit and raise the welding
in the welding position, movable edge guides for
head, means to reverse the movement of the
welding head, and a limit switch actuated by the 20 said strip, said switch being actuated by said
weight to move said stop bar and guides toward
welding head on reverse movement thereof to
operative position, a second limit switch actuated
stop its movement and to rotate said rotatable
by said weight on continued movement thereof
roll.
,
to stop the rotation of said roll and to move said
19. Apparatus for positioning and welding strip
end to end in a continuous strip processing line 25 Wheel out of contact therewith when the strip
has reached the welding position, manually oper
comprising a rotatable roll for drawing the lead
able means for positioning the leading edge of
ing strip through the line, means for rotating
the trailing strip against the stop bar in welding
said roll, means for actuating said rotating
position, a clamp for holding the strips in posi
means, a wheel adapted to be swung into contact
with said roll by said actuating means, a cable 30 tion to be welded, means for moving the clamp
into operative position, a movable welding head,
drum mounted for rotation with said wheel, a
cable wound on said drum, a weight on the lower
an electrode mounted on said welding head,
means actuated by movement of said clamp into
end of said cable, the position of said weight indi
operative position to move the electrode into con
cating the relative position of said strip, a mov
able stop bar for holding the strip in the welding 35 tact with said strips and supply power to the
electrode, means responsive to ‘the completion of
position, means actuated by said Weight for mov
the welding operation to open the power circuit,
ing said stop bar to its operative position and
to return the guides and stop bar to their inop~
stopping the rotation of said roll when the strip
ative positions and to raise the clamp and weld
has reached the welding position, manually oper
ing head, means actuated by upward movement
able means for ‘positioning the leading edge ‘of
the trailing strip against the stop bar in welding
of the clamp to reverse the movement of the
welding head, and a limit switch actuated by the
position, a movable‘ welding head, an electrode
welding head on reverse movement thereof to
mounted on said welding head, means for moving
stop its movement and to rotate said rotatable
the electrode into contact with said strips and for
supplying power to the electrode, means respone ‘ roll.
sive to the completion of the welding operation
GEORGE H. RENDEL.
to open the power ‘circuit, to return the stop bar
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