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Патент USA US2412278

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Dec. 1% 1946.
Filed July 23-, 1943
3 Sheets-Sheet l
//V VEN 701E
197' TOE/V5)’
De; 10, 1946.
2,41 2,2 78
1 Filed July 23', 1943
v3 Sheets-Sheet 2
F. W
Patented Dec. 10, 1946
Frank Martindell, Western Springs, 111., assignor
to Western Electric Company, Incorporated,
New York, N. Y., a corporation of New York
Application July 23, 1943, Serial No. 495,909
7 Claims. (01. 219-4)
This invention relates to article feeding appa
in the direction of the arrows showing the details
of the adjusting mechanism for the pawls.
Referring to the drawings, wherein like refer
ratus and more particularly to an apparatus for
feeding‘ parts to a welding machine.
It is an object of the present invention to pro
vide a simple and highly accurate feeding mech
anism for feeding parts to a processing machine.
In accordance with one embodiment of the in
vention, an apparatus is provided for feeding con
tact springs between a pair of welding electrodes
throughout the several views, particular refer
ence first being had to Fig. 2, there is shown a
portion of a weldingv apparatus of the type shown
in detail in the co~pending application of Frank
Martindell, Serial No. 450,409, ?led July 10, 1942,
Where short lengths of contact material may be ll) now Patent No. 2,388,754, dated Nov. 13, 1945.
As described in detail in the aforementioned co
welded to the springs. The apparatus for mov
pending application, the contact welding appara
ing the parts to position to have the contacts
tus includes a main base plate 31 having a verti
welded on them comprises an indexable tab-1e un
cal shaft 52 extending through it for driving the
der constant torsion from a torque motor drive
contact strip feeding mechanism, designated gen
and released‘ to step a new contact spring to posi
erally by the numeral II, and the circular upper
tion between the welding electrodes each time a
welding electrode 2| through the operation of a
welding operation is completed. The table has a
cam shaft 46, which is adapted to be driven by
pair of micrometrically adjustable pawl mecha
the vertical shaft 52 and carries suitable cams 45,
nisms associated with it and normally urged to
engage teeth formed on the table to block motion 20 one of which drives a lever 40 which is adapted to
actuate an upper electrode supporting head 22.
of: thertable, but operable under solenoid control
Other cams on the shaft 45, through the instru
in timed relation to the operation of the welding
mentality of a link M4 and lever I43, recipro
machine whereby when one pawl is in engage
cate a cutter 28. The upper welding electrode 2|
mentwith a ratchet tooth on the table, the other
associated with a cylindrical lower welding
pawl isreleased therefrom. The micrometric ad
electrode 20 and for each cycle of operation of the
justment of the pawls permits a very ?ne adjust
welding apparatus, a contact will be welded onto
ment over a relatively wide range of the positions
a contact spring. In the apparatus disclosed in
to which the table will be indexed.
A clear understanding of the invention may be 30 the aforesaid co-pending application, means is
provided for rotating the circular upper welding
had by reference to the following detailed de
electrode 2| and the cylindrical lower welding
scription when considered in conjunction with
electrode 20 to present new areas of the electrodes
the accompanying drawings, wherein
in juxtaposed positions for each new welding op
Fig. 1 is a plan view of an indexable contact
eration. These mechanisms include a driving
spring~carrying table and its associated parts
disc 6'0‘ and a driving ?nger 61 adapted to actuate
which effect its indexing operation;
the lower electrode. The driving disc 66 is
Fig. 2 is a transverse. vertical sectional view
mounted upon a main drive shaft 55, which is
taken substantially along the line 2——2 of Fig. 1
connected by suitable gearing 53 to vertical shaft
inv the direction of the arrows showing some
52. The main drive shaft 55 is adapted to be
details of the welding mechanism so far as they 40 driven by a motor I2 secured to the underside of
pertain to the present invention and showing the
the base plate 3'! and connectible to the main
details of construction of the drive mechanism
drive shaft 55 through a solenoid actuated clutch
for the indexable table, together with a super
I 3 of any suitable type. The shaft 55 is sup
posed circuit schematic of the various control
ported in a bearing l4 ?xed to the underside of
connections for the apparatus;
45 the base plate 31. In a preferred form of the in
Fig, 3 is an enlarged detail plan section of a
vention, power for operating the solenoid actu
portion of the apparatus showing the solenoid
ated clutch is supplied from a current source 15,
actuated pawl and a small section of the ratchet
through a switch I 6, which is closed in a manner
portion of the indexable table;
to be described hereinafter, and through a man
- Fig. 4 is an irregular vertical sectional view
ually operable switch I l in series.
taken substantially along the line 4-4 of Fig. 3
Mounted on the bearing bracket i4 is a stud
in the direction of the arrows showing further
shaft 35 having freely rotatable thereon a driven
details of the pawl mechanism; and
gear I 8, which has suitably secured to it a switch
Fig. 5 is a transverse vertical sectional view
cam 19,,the gear l8 and switch cam l9 being ro
taken substantially'along'the line 5-5 of Fig. 4 65 tatable together and being held on the stud shaft
30 by a collar 23. The gear I8 is adapted to be
driven by a driving gear 24 mounted upon the
main drive shaft 55 and when the gear 24, which
part rotation to the table 44, the table will always
, tend to rotate in the direction shown by the arrow
75 in Fig. 1. Interposed between the lower sur
face of the table 44 and a shoulder ‘I6 (Fig. 4) on
is one-half the size of the gear I8, drives the gear
the bearing member 43 is a ratchet ring 'I‘I, which
I8 and switch cam I9, the switch cam will, at a
predetermined time in the cycle of rotation of the
is ?xed to the table 44 and the bearing member
43. A pair of pawls ‘I8 and 79 are normally
gear I8, alternately close the switches 25 and 26
for a purpose to be explained hereinafter. This
urged to engage the teeth of the ratchet ring and
arrangement of the gears 24 and I8 and the asso
thus block movement of the table 44. The pawls
ciated switch cam I9 is such that on alternate 10 l8 and ‘I9 and their associated actuating mecha
cycles of rotation of the shaft 55, the switch 25
nisms are of exactly the same construction and,
will be closed and on the intermediate cycles the
accordingly; only the pawl ‘I8 will be described in
switch 26 will be closed.
detail. This mechanism is shown most clearly
The main base plate 3'!‘ has mounted thereon a
in Figs. 3, 4 and 5, to which reference will now
bearing ring 38,'which encircles the lower weld
be had.
ing electrode 20 and is mounted eccentrically of
The pawl ‘I8, as seen most clearly in Fig. 3, is
said electrode 20. This bearing ring is shaped, as
provided with a tooth engaging portion 89 ex
shown most clearly in Fig. 4, to receive a series
tending from a relatively resilient portion SI,
of ball bearings 39 between a curved surface M
which is of substantially U-shaped con?guration,
on the ring 38 and a cooperating curved surface 20 permitting some ?exing thereof to take up the
42 formed onran upper annular bearing member
shock of a tooth on the ratchet ring ‘I'I engaging
the tooth engaging portion of the pawl. The re
43, which, in turn; supports an annular index
able table 44. The upper bearing member 43 has
I silient portion SI of the pawl is formed integrally
a ring gear 41 formed thereon and meshing with
with an arm 82, which is, in turn, oscillatable
an idler gear 48, which is freely rotatable on the 25 about a pivot pin 83. The pawl 78 has a pivot pin
upper end of a stud shaft 49 set into a bearing 50.
84 mounted in it on which there is pivotally
The bearing 59 ‘is mounted on a bracket 5|, on
mounted one end of an adjustable link 85, the
which there is also mounted a gear housing 54.
other end of which is pivotally attached by means
The gear housing 54 encloses a part of the gear
of a pin 86 to a cross-shaped core member, desig
48 and a driving gear 56 mounted on the end of 30 nated generally by the numeral 81. The core
the drive shaft 57 of an induction type torque
member 81 is provided with arms 88, 89, 90 and
motor 58. The motor 58 is connected in parallel
with the solenoid actuated clutch I3 so that
whenever power is supplied to the solenoid actu
SI, the arms 88' and B9 constituting guide por
tions positioned between guide plates 92 and 93
attached to the upper and lower surfaces of guide
ated clutch for connecting the motor I2 to the
blocks 94' and 95. The pin 86 is set into the arm
main drive shaft 55, power will also be supplied
99 and the arm 9| is normally positioned a short
to the motor, 58; tending to operate the motor 58.
distance Within a coil 95, which nests between the
An induction type torque motor is chosen for this
guide blocks 94 and 95 and rests upon support
operation since the motor will tend to run contin
blocks 91 and 98 (Fig. 4), which are, in turn,
uously, but will be stalled most of the time,’ and
mounted on the‘spacer block 99. Positioned di
thisv particular type of motor does not overheat
rectly beneath the spacer block 99 is a mounting
an appreciable amount and, therefore, will not be
plate I90, to the left end of which (Fig. 4) a post
IIlI is attached for threadedly receiving a cylin
damaged when used in this manner.
drical adjusting member I92. The cylindrical
The annular indexable table 4|] is surrounded
by a housingt?, which is broken away at the 45 adjusting member I02 has a central recess I03 in
point of entrance to the housing of the gear train
which a compression spring I94 is seated and the
including the gear 48. Approximately in align
adjusting member I02 may be locked in place by
ment with the stud shaft 49, there is a bracket 69
a lock nut I05 after being adjusted relative to the
?xed. to the upper surface of the housing 68 for
post IOI. The head I06 of an actuator screw III'I
supporting the switch I6. This switch is one of
?ts into the recess I 03 and is engaged by the
the type, known as “microswitches” having a
spring I94.’ The shank of the screw I0‘! is
roller ‘I0 which is normally held in its downward
threaded into the arm 9| of the core member 81
position to hold the elements of switch I6 open.
and thus the core member 81 will normally be
The bracket 69 is so shaped that the roller ‘I9 of
urged to the right (Fig. 3) under the force of the
switch IE will be in alignment with a series of 55 spring I94 and the amount of pressure exerted by;
holes ‘II formed in the indexable table 40 in po
the spring I I14 on the actuator screw I9‘! may be
adjusted by adjusting the position of the ad
sition to be covered by contact springs 12 properly
positioned on the table in position to have con
justing member I92 with respect to the post “II.
tacts welded on them. From the foregoing, it is
The pawl 18 and its interlinked actuating mecha
nism, together with the coil 96, comprise a uni
believed to be apparent that the roller ‘ID will
move into one of the holes ‘II if the hole is not
tary structure mounted on a unit'base I20, to
covered by a contact spring ‘I2 and, accordingly,
which the mounting plate I00 may be attached
will break the circuit to both the torque motor 58
in any suitable manner and which supports a
and the solenoid actuated clutch I5 in spite of the
way block I'2I having a dove-tail slot I22 formed
fact that the manually operable switch I‘! may be
in it for receiving a dove-tail slide I23.‘ The
closed at that time.
The upper surface of the
table is provided with a series of pins 13-43 for
engaging the side edges of the contact springs ‘I2
and is also provided with pins 74-14 adapted to
enter suitable apertures formed in the contact
springs, thus to position the contact springs in
proper position to have contacts welded on them.
Since the torque motor 58 will, whenever the
dove-tail slide I273 may be locked in the slot I 22
by means of a locking platerl24 inserted in the
dove-tail slot afterthe slide I23 has been posi
tioned therein. As is shown most‘clearly in Fig.’
5, the dove-tail slide I 23 has the pivot pin 83
mounted in it and thus the slide I23 supports the
pawl'lB. The‘position of the pawl ‘I8 with re
spect to'the unit base I20 may be adjusted by
switches I6 ‘and, I‘! are closed, supply power tend-V
shifting the slide I23 to the right or left (Fig. '5)
ing to drive the gear 56 and, consequently, to im 75 and, accordingly, the position of the annular'in
dexable table 524 may ibelcontrolled ‘with ‘a high
degree of accuracy due tol'the construction now
The slide I23 is provided. with a threaded aper
ture I25 adapted to receive a threadedlportionlz?
‘of an adjustment screw- I21. A second threaded
portion I23 ‘of the adjustment screw iI2‘I is
threaded intoia'threaded aperture I23 ‘formed in
‘an upwardly extending portion I36 of the way
block‘ I2I. ~The threaded portion i23 of the ad
ratchet :ring to rotate until the pawl ‘Ll engages
one of the teeth on the ratchet wheel; Ifa com
plete supply of contact springs ‘I2 has been prop
erly positioned on thetable 44,.the :circuit to the
clutch I3 will not be interrupted‘ at :theswitch
I3 and the clutch I3 will, therefore, remain 0p
erative and shaft 55 will continue to rotate. As
‘the shaft’ 55 continues to rotate, the welding por
tion of theapparatus will operate, as described
10 in detail in the hereinbefore identi?ed co-pend
ing application, and each'time the shaft 5.5 com
pletes one revolution, a contact will be sheared oii
and welded to a contact spring ‘I2. Duetoithe
gear ratio betweenthe gears IS and 24, the cam
when the adjustment screw I21 is‘rotated, the 15 switch It will operate one or the other of .the
switches ‘25 and 26 for each cycle of the shaft 55
screw will‘ move bodily with ‘respect to the way
these switches will be operatedalternately.
block IEI and will simultaneously move the slide
Therefore, as soon as the shaft 55 completes one
I23in a direction opposite to'the direction of bod
revolution, switch 25 will be opened to de-energize
ily movement of the screw I21. Thus exceeding
ly ?ne adjustments maybe made in the position 20 solenoid coil st and permit the pawl ‘I3 to engage
' 1e sloping surface of one of the teeth on the
of the dove-tail ‘slide’
and, accordingly, the
ratchet ring 'I‘é. Switch 28 will, at this time-be
position of the pawl ‘I8 with respect to the ratchet
closed to'supply current to the solenoid coil I32.
ring ‘I? may be adjusted. The unit base I20 for
.Solenoid coil I32, being energized, will remove the
the pawls ‘I3 and 73 may be ?xed to the main
pawl ‘I3 from engagement with the ratchet‘ring
base plate
in any suitable manner‘and the
justment screw I2‘I has a relatively coarse thread
c'ut'into it and the threaded portion I26 has a
relatively'?ne thread cut in it, both of the threads
having their leads in the same direction whereby,
housing 63 may be provided with suitable aper
tures I3I, through which the free end of the ad
‘II, permitting the ratchet-ring TI and ‘table 44
secured thereto to move until the pawl ‘I8 blocks
further movement thereof. It will be understood
justment screws I2‘! may extend.
that as soon as the switches I6 and I? are closed,
It will be understood that the pawl ‘I9 is pro
vided with a solenoid coil I32 of exactly the same 30 power will be supplied to the induction type
torque motor 53 simultaneously with the energi
construction as the solenoid coil 96 and that the
zation of the solenoid operated clutch I3 and that
the torque motor will continue to exert a driving
force through gears 56 and 48 to the ring gear
bearing I33 individual to it and is provided with 35 47 and thus all the time that the clutch I3 is en
ergized, the motor 38 will tend to drive the table
a knurled portion I34 adapted to be engaged by a
M. However, the table 44 will only move when
retainer spring I35, whereby when the adjustment
one of the pawls ‘I8 or ‘I9 is removed from block
screw is set to one of its adjusted positions, the
ing association with the ratchet ring ‘I‘I. Opera
spring I35 bearing against the knurled portion
I34 will prevent accidental rotation of the ad 40 tion of the motor 58 and clutch I3 will be inter
rupted any time a portion of the table 44, which
justment screw I‘Z‘I.
should have had a contact spring 12 positioned on
By means of the adjustment screws I2‘I, the
it arrives under the roller ‘I0 without a contact
position of the pawls ‘I3 and ‘I9 may be adjusted
spring in place on the table due to the roller 10
over a relatively wide range, whereby the index
entering one of the holes ‘II.
able table 44 vmay be stopped in approximately
What is claimed is:
any desired position so that contact springs ‘I2
1. A feeding apparatus for a processing ma
carried thereby may have contacts welded to them
chine haVing a driving motor and an indexable
in any desired location on the spring.
table comprising a torque motor drive for said
By reference to Fig. 2, it will be seen that the
table, escapement mechanism for rendering said
solenoid coils 9B and I32 will have current sup
torque motor drive ineffective, and means driven
plied to them from the source I5 under control
by the processing machine motor for controlling
of the switches 25 and 26, whereby the solenoid
said escapement mechanism, said escapement
coils 3B and I32 will be automatically energized
mechanism including a pair of alternately ener
due to the construction of the switch cam I9,
gizable solenoid operated pawls operable in timed
which controls the switches 25 and 23.
relation to the processing machine.
A complete understanding of the invention may
2. In a feeding mechanism for a processing
be had by reference to the following brief descrip
machine having a driving motor and including
tion of the mode of operation of the apparatus.
an indeXable table, a torque motor tending to
After a supply of contact springs ‘I2 have been
placed between the pins ‘I3 and with the pins ‘I4
drive said table, a ratchet on said table, solenoid
operated pawls normally urged to engage said
entering the apertures in the spring ‘I2, manually
operable switch I‘I may be closed and since the
ratchet, and means driven by the driving motor
bracket {'39 supporting the switch I6 is so posi
of the processing machine for alternately ener
tioned that the roller It! will be engaging an im
gizing the solenoids of the solenoid actuated pawls
perforate portion of the top of the table 44 when
to disengage the pawls from the ratchet.
the machine is at rest, power will be supplied
3. In a feeding mechanism for a processing ma
from the source I5 through switches I6 and I1 to
chine, the combination with means for driving
the solenoid actuated clutch I3 and will initiate a
the processing machine of an indexable table, a
cycle of operation of the shaft 55, it being as
torque motor tending to drive said table, a ratch
sumed that a suitable source of power has been 70 et on said table, solenoid operated pawls nor
connected to the motor I2 to energize it. Since
mally urged to engage said ratchet, means oper
the switch 25 is closed as shown in Fig. 2 at this
able by the driving means for the processing ma
time, solenoid coil 96 will be energized and pawl
chine for alternately energizing the solenoids of
‘I8 will be withdrawn from engagement with the
the solenoid actuated pawls to disengage the
two pawl actuating mechanisms and adjusting
mechanisms are identical in construction. Each
of the adjustment screws I21 extends through a
face of the ratchet ring 11, thus permitting the
pawls from the ratchet, and means for adjusting
the effectiveposition of said pawls with respect
of such pawls with respect to the ratchet for
to the ratchet.
adjusting the stopping positions of the index
A. In a feeding mechanism for a processing
machine, the combination of a motor drive for
the processing machine with an indexable table,
a torque motor tending to drive said table, a
ratchet on said table, solenoid operated pawls
normally urged to engage said ratchet, means
operable by the driving motor for the process
ing machine for alternately energizing the sole
noids of the solenoid actuated pawls to disengage
the pawls from the ratchet, and means for in
dividually adjusting the effective position of such
pawls with respect to the ratchet for adjusting
the stopping positions of the indexable table.
5. In a feeding mechanism for a processing
machine, the combination of a drive motor for
the processing machine with an indexable table,
a torque motor tending to drive said table, a
ratchet on said table, solenoid operated pawls
normally urged to engage said ratchet, means
operable by the driving motor for the process
able table, said last mentioned means including
an adjustment screw having threaded portions
of different pitch.
6. In a feeding mechanism, a base member,
a ratchet normally urged to rotate on the base,
a pawl support adjustable with respect to the
base, and means for adjusting the pawl support
including a bracket ?xed to the base and a
threaded member threadedly engaging the pawl
support and base, said threaded member having
portions threaded di?erently to separately en
gage the pawl support and base.
7. In a feeding mechanism, a base member,
a ratchet normally urged to rotate on the base,
a pawl support adjustable with respect to the
base, and means for adjusting the pawl support
including a bracket ?xed to the base and a
threaded member threadedly engaging the pawl
support and base, said threaded member having
relatively coarse and ?ne pitched threads formed
ing machine for alternately energizing the sole
on it and having its coarse and ?ne threads
noids of the solenoid actuated pawls to dis
threadedly engaging the base and pawl support,
engage the pawls from the ratchet, and means 25 respectively.
for individually adjusting the effective position
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