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Патент USA US2409889

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Oct., 22, 1946.
2,409,888
J. OGDEN
TIMING :DEVICE
Filed sept. 21, 1940
/52
:inventor
l
jack ¿gade/¿If
_ 'Gttornegs/
'2,409,888
Patented Oct. 22, 1946
lUNITED STATES PATENT OFFICE
2,409,888
TIMING DEVICE
Jack Ogden, Huntington Woods, Mich., assignor
to General Motors Corporation, Detroit, Mich.,
a corporation of Delaware
Application September 21, 1940, Serial No. 357,794
11 Claims. (Cl. 21S-4,)
1
2
This invention relates to timing devices and
more specifically to electrical circuits for measur
It is a further object of my invention to provide
such a timing device that can be easily applied
ing minute time intervals. The need for measur
ing devices which will measure very small incre
to an existing circuit and which will not interfere
ments of time has increased decidedly and at the
present time devices of this nature are much in
It is a still further object of my invention to
provide such a timing device as will be easily
demand.
portable and maintain its adjustments.
While the uses for such a device
with the normal operation thereof.
With these and further objects in view which
throughout industry are varied, one might be
will be apparent upon the disclosure which is to
mentioned as an example here in timingr the
various steps of welding machine cycles. The 10 follow, my invention will be best understood by
reference to the following speciilcation and
art of welding has moved rapidly and in order
claims and the illustration in the acompanying
to provide the results desired, welding times
drawing, in which;
must be measured very accurately and then the
The ñgure shows a schematic wiring diagram
control adjusted to keep them within very nar
of the time measuring system of my invention.
row limits. While, of course, the most important
There is shown in the upper left-hand portion
time is the welding time, nevertheless the other
of the figure an incoming line 2, 4 which is
time periods which go to complete the total weld
labeled in the present instance “440 volts” which
ing cycle are also important and with the present
is that usually supplied to supply lines for weld
speed of welding become very minute. Since
many materials are welded and in quantity the 20 ers, but which may of course be any other voltage
required. In this line is a single or double-pole,
welding machines receive considerable use and
single-throw switch 6 which connects the line to
it is necessary therefore to check these periodi
the primary 8 of the welding transformer I0
cally to make sure they stay within the certain
across whose secondary I2 are applied the two
predetermined time limits in order to provide
electrodes I4 and I6 for welding. These are held
the welds which they were designed to produce.
in any conventional support I8 and may be moved
Therefore, the present invention shall be de
relative to each other for clamping the work
scribed as applied to a welding circuit, but it is
therebetween. Connected across one side of the
to be understood that this is merely illustrative
l switch S is a resistor 28, the purpose of which
as to one of its uses and that it may be used
equally as well to measure the time of any other 30 will later be described. Connected to the sta
tionary terminal of the opposite side of the
means where minute times are important. In
switch 6 is a line 22 in which is provided in series
welding, therefore, there are four main portions
a switch 24 and a fuse 26. There are then con
to a complete welding cycle: ñrst, the “olf” time
nected between this line 22 and aline 28 connect
during which the circuit is inoperative; second,
' ed to the movame switch ieg of the switch s two
the “delay” time during which the material is
resistances 3() and 32 in parallel. A movable
placed between the electrodes, but before the
switch point 34- which may be moved over the
operating current has been turned on; third, the
resistance 30 is connected by a line 36 to a line 38
“weld” time during which welding current is ap
which is connected to one side of a snap-over
plied; and, fourth, the “hold” time during which
the welding current is orf but the material is still 40 switch 40. The line 38 is also connected to a
movable point 42 which slides upon the resistor
held between the electrodes for a short period to
32 to cut in or out varying portions thereof.
allow it to cool. These four steps comprise the
The movable member 40 cooperates with a sta
complete welding cycle and of course are re
tionary point 43 which is connected by line 44 to
peated as often as necessary to provide additional
welds to the material. It has been found that 45 two spaced stationary switch points 46 and 48
which cooperate with a rotating switch arm 50.
the time periods for each of these portions of
Also cooperating with the same switch arm 50 are
the machine cycle is Very important and in order
two ‘other stationary switch members 52 and 54,
to obtain commercially satisfactory welds it is
all four of said stationary points lying in a circle
necessary to have each fall within the predeter
mined limits and of course it is well-known that 50 around the axis about which the switch arm 50
rotates. Connected t0 the switch arm 50 is a
these times now comprise cycles or perhaps even
line 56 which is connected to a relay coilv 58, the
fractions of cycles of supply current fluctuation.
opposite side of which is connected directly to the
It is therefore an object of my invention to pro
vide timing means capable of measuring very
line 28 which as before mentioned is connected to
small time periods.
55 incoming line 2 below the switch 8.' Connected
2,409,888
between lines 56 and 28 is a resistor 60 and tapped
to this resistor and variable over the surface
thereof is a switch point 62 which is connected to
a small neon lamp 64, the opposite side of which
is connected to the line 28.
Cooperating with the switch arm 50 and me
chanically connected thereto to move in syn
chronism therewith is a second switch arm 66
which rotates about and engages a series of sta~
tionary switch points 68, 10, 12 and 14, switch
point 68 being connected to stationary switch
point 54 by line 619 and switch point 10 being
connected to switch point 52 by line 1|. There
is also a third rotating switch arm 16 which en~
4
The tube |42 supplies direct current across a pair
of condensers |46 and |48 and a resistor |50
through lines |52 and |54. Line |54 continues
and is connected to a relay coil |56, the opposite
side of which is connected by line |58 to a varia
ble resistol` |60, the adjustable tap |62 of which
is connected by line |64 to line |66, this line be~
ing connected to a stationary switch point |68.
Between lines |54 and lines |66 there is provided
a ñxed condenser |18. The adjustable tap |12
on resistor |50 is connected by line |14 to a mov
able switch point |16 actuated by relay coil 58
and cooperating with the stationary switch point
|66 just described. Thus the tube |42 supplies
gages stationary switch points 18, 80, 82 and 84 15 power to charge the condenser |10 and energize
substantially in circular position thereabout.
the relay coil |56.
These three rotating switch arms 50, 66 and 16 are
The tube |44 on the other hand supplies power
mechanically connected together so that when
across a pair of condenser-s |18 and |88 which
one is moved they al1 assume the same relative
are in parallel across a variable resistor |62
position. This is shown by the dotted line con 20 through lines |84 and |86. The resistor |82
nections.
has two adjustable taps |88 and |90, the iirst
The rotating switch arm 66 is connected by line
of these being connected through line |92 to a
86 to one side 88 of a compound relay, the center
cathode |64 oi a “magic eye” or 5h15 tube of the
tap of which is connected by line 90 to line 26
cathode ray type. Line |82 is also connected >to
and the opposite side 89 of which is connected by
one side oi a resisto-r |96 and one side oi' a con»
line 92 to the rotating arm 16. These two relay
denser |88, the opposite side of the resistor being
coils 88 and 89 actuate the snap switch member
connected by line 260 to a stationary contact
40 which maintains the position into which it
262. The opposite side of the condenser is con~
was last moved so that it is necessary to energize
nec‘ted through line 204 to line 206, the latter
coil 88 to open switch 40 and coil 89 to close the
being connected to a movable switch element 266
same.
and to the grid or control element 2|0 oi' the
Connected to one side of the transformer sec
6h15 tube. The stationary switch member co
ondary I2 is a line 94 which is connected to a re
operating with the movable switch element 208
sistance 86, the opposite side of the resistance be
is connected by line 2|2 to a movable switch
ing connected by line 88 to a second resistance
member .2|4 actuated by the relay coil 58. Lino
|00 which is in turn connected by line |02 to one
264 continues and is connected to a movable
of the welding electrodes I6. The opposite weld
ing electrode, namely I4, is connected by line |04
switch point 2|6 also actuated by the relay coil
These three movable contacts |16, 2|fli, and
to the common line 98. Both resistors 86 and |00
2M are all supported on a common bracket and
are variable and have adjustable taps |66 and 40 are moved simultaneously by the actuation oi
|00 respectively which may be moved to vary the
the relay coil 56. It should also be noted that
amount of current flowing in their respective eir
switches |68-|16 and 2|6-2i6 are closed upon
cuits. Tap |06 is connected by line ||0 to the
energization of the relay coil 58 while switch
primary ||2 of a transformer ||4 and |08 is con
202-2I4 is opened upon such energization. Any
nected by line | I6 to one side of the primary ||8 45 suitable spring bias means (not shown) may be
of a second transformer |20, the opposite sides of
provided to return the movable switch arm upon
both primary ||2 and ||8 being connected to
deenergization of the coil 53 to its deenergized
gether by a line |22 which is also connected to
position to open switches |68---|16 and 2|6-2I8
line |04.
and close switch 25M-2M. The movable Contact
One terminal of the secondary |24 is connected 50 2|6 .cooperates with a stationary Contact 2i
by line |26 to stationary contact 10 engageable
which is connected by line 220 with a resistor
with the rotating switch member 66.
Tapped
from this line is a further line |28 which is con
222, the opposite side of which
connected by
line 224 to a variable resistance 225 which is con~
nected to the stationary contact 18 engageable
nected to the line |86. The remaining elements
by the rotating switch arm 16. One side of the 55 228 and 230 of the 6E5 tube are connected across
secondary |30 of the transformer |20 is connected
a resistor 232 and thence by common line 234 to
by line |32 to stationary contact 80 engageable by
the adjustable tap |80 on resistor |62.
rotating switch member 16 and a tap line |34
From the foregoing' it will be evident that there
connects line |32 with the stationary contact 68
is provided a circuit -io-r the welding machine
engageable by the rotatable switch member 66. 60 proper, a control circuit tapped from the weld
As in the primary circuits, the two secondaries
supply circuit which is settable in a series ci
|24 and |30 are connected together by line |35
positions, and a third circuit supplied by power
and are connected to line 28 «by line |30.
at a lower potential for operating the indicating
It is, of course, obvious that switch 40 is oper
means which in this instance is a cathode ray
ated by relay coils 88 and 89 and that the re 65 tube which has a portion thereon the shade of
mainder of the Switches in the circuit vdescribed
which may be changed by a control electrode in
so far are all manually operated switches.
There is also provided a lower voltage supply
line |40 of a voltage, for example 110 volts, to
the nature of a shadow to set or indicate the
time interval. When the welding control switch
6 is closed power is supplied to the transformer
supply power for the indicating apparatus, the 70 l0 and when the welding electrodes | 6 and ifl
apparatus described up to this point being what
are placed in juxtaposition to the material cur~
might be called control apparatus. This incom
rent is allowed to flow therethrough to perlorm
ing 110 volt line is connected to two rectifier tubos
a weld. The three switch arms 50, 66 and 16 as
|42, |44 which supply the necessary direct cur
before mentioned all move in unison and are
rent from the usual alternating current supply.
placed upon the corresponding stationary switch
2,409,888
5
6
points for measuring different time intervals.
For example, when they are all in their upright
position orin contact with switch points 48, 68
and 18, respectively, the circuit Yis in condition
opening of switch |68, |16 will open the circuit
to the relay coil |56. However, this will not im
Let us assume ñrst that it is desired to measure
the off time or that time during which no ma
server may follow fluctuations on the shadow in
mediately dropits contact 208 inasmuch as the
condenser |10 is still directly across the relay
to measure the hold time. When they are moved
terminals. This charge will slowly leak off and
down to the next counterclockwise position and
in a short time the switch 208 will drop, com
contact switch points 46, 10 and 80, respectively,
pleting the short-circuit around the condenser
they are in kcondition to measure the delay time.
|88 and discharging the same, returning the
When they are moved one further notch downn
apparatus to its initial condition. This delay is
ward the circuit is in condition to measure vthe lO provided to allow a time to elapse between the
weld time and when they are in their lowermost
charge and discharge of the condenser |98 so
position they measure the off time.
that the retina of the eye of the operator or ob
the cathode ray tube. It will thus be evident
terial is between the electrodes, the same having
that as the variable resistor 226 is altered so
been moved apart and the switch 6 is open. The
that the shadow will disappear the reading oncurrent on the incoming line 2-4 will of course
this dial in seconds will give the duration of the
be available and it is assumed in this instance
portion of the cycle ibeing measured.
that the switch 24 is closed. Some current will
While in this instance switch 40 was not uti
of course flow through the primary 8 of the weld 20 lized in the energizing circuit for the relay 58,
ing transformer I0 through the resistances 20
it does play an important part in some of the
and 30 and this will of course develop some poten
other portions of the cycle to be measured, name
tial across the secondary l2 which will be avail
ly, in the delay and hold periods, and is utilized
able across lines |04`and |02.y Thus there will be
to open once each cycle to maintain the relay
an energizing circuit for relay 58 provided as 25 coil 58 deenergized during the period not in
follows: secondary l2, line |04, line |22, primary
tended to be measured. Both the hold and delay
times are measured by voltage developed across
H8, line H6, contact |08, resistor |00, line |02,
to electrode |6 to the opposite side of the sec
resistances 30 and 32 and therefore if it is desired
ondary |2. This will cause energization of the
to measure hold time then it will be necessary to
transformer secondary |30 which will provide an
deenergize the control circuit through the delay
energization for the relay coil 58 as follows:
time portion of the cycle or otherwise the two
secondary |30, line |32, line |34, line 60, contact
would be superposed and could not be differen
point 54, switch arm 50, line 56, relay coil 58,
tiated. It is therefore so designed that this
line 28, line |38 back to secondary |30.
switch is set in its closed position in the portion
As will be evident from the diagram, when re 35 of the cycle immediately preceding that being
lay 58 is energized and attracts its armature,
measured for the hold or delay measurements.
contacts |68, |16 and 2|8, 2| 6 close and contacts
In other words, if we are measuring delay time
202, 2|4 open. The closure of contacts ISB-_|16
then the coil 88 is energized in the off portion
causes the energization of relay coil |56 through
of the cycle to properly position the switch con
the following circuit: From the output of tube 40 tact 40 so that when the portion of the cycle being
|42, line |54, relay coil |56, line |58, resistor |60,
measured arrives it will be in its proper position.
line |64, line |66, contacts |68--|16, line` |14,
With this explanation let us new proceed to
adjustable point |12, resistance |50 to line |52.
trace the circuits utilized when measuring delay
At the same time this applies the output voltage
time and we move our gang switch 50, 66, 16 to
of tube |42 to the condenser |10. When relay 45 a position in which the` arms are slanting up~
coil |56 is thus energized it attracts its armature
wardly to the left and are on stationary con
and opens the switch 288. With the opening of
tacts 46, 10 and 80. It is to be remembered that
this switch and switch 202, 2|4, the short circuit
during the measurements of any of these por
applied to the condenser |88 is entirely removed
tions the total cycle is being repeated at all times
and closure of switch 2|6, 2|8 applies to this con 50 and we only isolate a portion thereof for meas
denser through a circuit to be described the out
urement with the gang switch in the position just
put of tube |44. This is applied through the fol
mentioned. The relay 58 will now be energized
lowing circuit: line |86, variable resistor 226, line
by the voltage drop across resistances 30 and 32
224, resistor 222, line 220, switch 2|6, 2|8 to con
and in order to avail ourselves of this Voltage it
denser |08. The amount of energy applied to 55 will be necessary to close switch 40. This is done
the condenser |98 is regulated by the setting of
by energizing the closing coil or coil 88 of the re~
the resistor 226, the dial of which is calibrated
lay which operates this switch. This is energized
in cycles. This Voltage is applied to the control
through the following circuit: the voltage across
element or grid 2|0 of the 6E5 tube and causes
the secondary of the welding transformer Il!
the shadow portion to become smaller and if re
again as in the previously described case ener
sistor 226 is properly set will disappear entirely,
gizes the transformer |20 so that its secondary
the setting of this dial indicating the length of
has current flowing therein and supplies the en.
time of the operation. The necessary operating
ergizing force for the relay coil 88 through the
voltages for the remaining elements of the tube
following circuit: Isecondary |30, line |32, contact
are provided by lines |92 and 234 through resist 85 80, switch arm 16, line 92, coil 89, return line 60,
ance |82 by obvious circuits.
line 28, line |38 back to secondary i3d It should
As the particular period, in this case olf time,
be remembered that this occurs in the time pe
is ñnished, the voltage between the two points
riod immediately preceding the delay time or in
first mentioned in the secondary circuit of the
the off time period during which there is no work
welding transformer will decrease due to the plac 70 between the electrodes and therefore the volt
ing of work between the electrodes causing relay
age of the secondary will be applied as before to
58 to be deenergized to open switch |68, |16 and
the transformer |20. This closes the switch 40
switch 216, 2| 8 and closing switch 202, 2|4.. The
so that it is fully closed when we arrive at the
delay portion of said cycle.
opening of switch 2|6, 2|8 will remove the sup
ply of energy from the condenser |08 and the 75 The relay coil 58 is then energized through the
2,409, ses
7
8
following circuit, it being understood of course
that voltage is developed across the resistors 30
and 32 and is conducted therefrom to line 38,
secondary of transformer I I2; secondary |24, line
|36, line |38, line 28, line 90, relay coil 89; line 92,
rotating switch point I6, contact 18, line |28, and
switch 40, contact 43, line 44, switch point 4S,
arm 50, line 56, relay coil 58, line 28, back to
back to the secondary |24. This causes the clo
sure of switch 4D in the time interval just pre
ceding the hold time so that during the time for
resistors 3U and 32. This again causes exactly
the same result in energizing the relay coil |55
and applying voltage to the condenser |38 to re~
duce the shadow area of the cathode ray tube
and again, by setting the variable resistance 225
so that the shadow entirely disappears, we may
read the correct time for this portion of the cycle.
In the next portion of the cycle immediately fol
holding relay coil 58 will be energized through
the following circuit: beginning again at the volt
age developed across resistors 3i] and 32, line 3B,
switch 48, contact 43, line 44, contact 48, switch
arm 5U, line 58, relay 58, line 28, and baci: to the
resistors.
Again We have the actuation of the
indicating means as before described. It is neces
lowing or the Weld portion, it is necessary to
sary in this instance as in measuring the delay
time previously described to cause switch 4|) to
mentioned the hold time will not also be meas
open during the oiî portion so that the delay time
ured. When the Iweld is being made there is a
also will not be indicated.
substantially heavy current flowing in the sec
It is thus obvious that by merely clamping to
ondary of the welding circuit, very little poten
the existing welding circuit the necessary connec
tial drop across the weld electrodes and therefore 20 tions which in this instance are only five wires,
only a slight current for the transformer |20, but
namely, 22 and 28 connected adjacent the manual
there will be a substantial potential drop through.
or automatically thrown weld switch, and lines
the lead from the secondary I2 to the electrode
|24 and i532 connected in the secondary circuit,
I4 and the primary of transformer ||4 will be
we are able to ascertain the accurate times of
energized through the following circuit: line 54,
the diiîerent portions oi the welding cycle. It is
only necessary to supplement this by connecting
resistor 98, tap |516, line III), primary H2, line
|22, line |04 to the lead adjacent the electrode
across the opposite side of the switch such as 6
I4. This drop in the lead will be applied to the
a resistor 2U to provide a continuous circuit to
primary and energize the secondary which Will
the Welding transformer when the switch 6 is
cause actuation of the opening coil 83 of the
open as it will be obvious that some current is
switch 4|! through the following circuit: second
necessary for the operation of the device at these
other times. rlï‘he various resistances provided
ary |24, line |25, contact lll, arm 55, line 86,
are as it will be seen mostly adjustable but these
coil 88, line 90, line 28, line |38, line |35 back
are merely for the purpose of initial setting to
to the secondary |24. This of course will cause
provide the proper current to any of the trans
the switch 40 to open during the weld time and
formers or other portions of the apparatus, de
therefore as the cycle proceeds to the hold time
pending upon the variations in the voltage of the
this will not now be measured. However, as the
cycle proceeds to off time the coil 89 will be again
circuit to which the test equipment is attached.
energized and the system put in condition for
`For example, tap |72 on resistor |55 is varied
relay 58 to operate during the delay portion which 40 until the proper voltage is applied to the relay
|56 and to the condenser Il!) thereacross. This
it has been assumed was being measured.
also applies to the variations in the taps |88 and
If we now desire to ascertain the weld time,
|90 of the resistor |82 which supplies power to
we move our gang switch to the third position in
cause switch 4|) to open so that as previously
which the movable switch arms extend down
wardly and to the left as in the figure and con
the 6h15 or cathode ray tube ior indicating pur
poses. The resistances 38 and 32 also have taps
so that the voltage applied by them for operating
the relay coil 58 may be varied to fall within the
tact stationary points 52, 'I2 and 82. In this po
sition a's before it is iirst necessary to set switch
proper range. This range may be found by uti
40 in the proper position and in this particular
lizing the neon tube 64 which is supplied across
instance it is desired to have this switch open
and it is so set and does not operate at all dur~ 50 the circuit to the relay coil 5B and the amount
ing this measuring operation. This will be evi
of resistance is increased until the neon voltage
dent from an inspection of the drawing as there
indicator flashes to indicate that su'liicient power
is being applied for actuation of the relay coil
is no circuit available through either coil B8 or
89. The power obtained in this particular test
when the necessity occurs. It will thus be evident
for operating the relay 58 is provided from the 55 that I have provided a test device which is porta
transformer secondary |24, the secondary being
ble, easily applied to existing apparatus, easily
operated and will continue to operate over a sub
stantial length of time with little repair.
tioned which are connected to the welding trans
former secondary I 2 through the voltage drop
I claim:
l. In a system for measuring the times of the
in the lead between the secondary i2 and the 60
various portions of a complete welding cycle, a
electrode I4. The circuit to the relay coil 58 is
now traceable as follows: secondary |24, line |267
welding machine, a. transformer having a primary
and secondary connected thereto, a source of
contact lll, line `II, contact 52,- switch arm 5U,
power for the primary and switching means to
line 56, relay coil 58, line 28, line |38, back to
secondary |24. This again causes the indicating 65 control the primary, a pair of lines connected
means to proceed through its previously described
across the switching means, resistances connected
cycle.
across each line, two lines connected directly
It will be obvious that the saine general pro~
across the welding electrodes and one line concedure is followed for ascertaining the holding
nected to one side of the transformer secondary,
time, the gang switch in this instance being 70 a pair of transformers connected across the last
placed in its uppermost position contacting sta
three lines, a compound switch connected to the
tionary points 48, B8 and 'I8 and in this instance
output of the pair ci transformers and to the
again relay 58 is energized due to the closure of
resistors, relay means connected to and supplied
switch 4|) by the closing relay coil 89 which is
with power from either the transformer pair or
energized through the following circuit from the 75 the resistances and controlled by the switching
energized by the same circuits as before men
2,409,888
means, and indicating means controlled by the
relay means whereby as the compound switching
times in the complete cycle, indicating means,
means is moved to different positions different
time periods will be measured as evidenced by
of said indicating means, control means connected
to the machine for actuating the switching means
switching means for controlling the energization
different voltages appearing between the Various>
and a second control means superimposed upon
incoming lines and indicated on said indicating
the ñrst and energized at desired intervals to
cause deenergization of the main control means
during duplicate condition periods when measur
2. In a system for measuring the times of the
ing the time of one of these.
various portions of a complete welding cycle, a
6. In a system for measuring the various time
welding machine, a transformer having a pri 10
periods of a welding cycle in which the machine
mary'and secondary connected thereto, a source
is in the same condition during both the delay and
of power for the primary and switching means
hold portions of the cycle, a transformer, the sec
to control the primary, a pair of lines connected
ondary of which is connected to the welding elec
across the switching means, resistances con
nected across each line, two lines connected di 15 trodes, a Voltage supply connected to the primary,
indicating means, control means therefor, a cir
rectly across the‘welding electrodes and one line
cuit controlling the energization of the control
connected to one side of the transformer sec
means connected to the secondary and the weld
ondary, a pair of transformers connected across
ing electrodes and energized both by the Voltage
the last three lines, a compound switch connected
to the output of the pair of transformers and to 20 across the electrodes when they are open or by the
voltage drop through the lead to determine the
the resistors, relay means connected to and sup
energization of the main control means so that
plied with power from either the transformer pair
only the delay or the hold time is measured at a
or the resistances and controlled by the switching
given setting.
`
means, indicating means controlled by the relay
'7. In a timing device for measuring the various~
means whereby as the compound switching 25
portions of a complete machine cycle, a plurality
means is moved to diiferent positions different
of conductive lines connected to the device to be
time periods will be measured as evidenced by
means.
tested at Various positionsl whereby voltage differ
different voltages appearing between the various
ences will be developed between different conclueL
incoming lines, and indicated on said indicating
means, said indicating meanscomprising, a visual 30 tors at diiferent times during the complete ma
chine cycle, switching means connected to the
indicator, a separate source of power, means con
conductive lines, relay means connected to the
nected between the visual means and the source
switching means whereby the relay may be con
for varying the power to the indicator and
nected to different pairs of conductors and have
switching means actuated by said relay means,
the periodic voltage appearing between them en
the setting of the variable means for indicator
ergize the relay, a condenser, indicating means to
input being an index of the time being measured.
show the charge on said condenser, a separate
3. In a system for measuring the time interval
of a portion of a machine operation while said ma
source of power, variable resistance means con
nected between the condenser and the source to
a transformer connected thereto to provide power, 40 vary the rate of charge of the condenser` and a
switch operated by the relay connected in series
a source of power connected to the transformer
with the resistance and the condenser to vary the
and a switch in the supply to control welding
time the charging current is applied whereby both
operations, a plurality of lines connected in .the
the rate and time of charging the condenser may
secondary circuit of the transformer across dif
chine is operating normally, a welding machine,
ferent points where voltages will appear during 4 be varied and the integrated charge indicated.
8. In a timing device for measuring the various
different parts of the welding cycle, relays oper
portions of a complete machine cycle, a plurality
ated by these different voltages, switching means
of conductive lines connected to the device to be
between the lines and the relays to connectl the
tested at various positions whereby voltage differ
relays to different lines whereby they will be
ences will be developed between different conduc
energized during different portions of the full
tors at different times during the complete ma
cycle and indicating means controlled by said re
chine cycle, switching means connected to the
lays.
conductive lines, relay means connected to the
4. In a system for measuring the time interval of
portions of a machine operation while said ma
chine is operating normally, a machine, a trans
former connected thereto to supply power, a
source of power connected to the transformer, a
plurality of lines connected to the secondary cir
cuit of the transformer across different points to
switching means whereby the relay may be con
nected
to different pairs of conductors and have
55
the periodic voltage appearing between them
energize the relay, a condenser, indicating means
to show the charge on said condenser, a separate
source of power, variable resistance means con
nected between the condenser and the source to
which voltage is supplied the machine where volt
vary the rate of charge of the condenser and a
ages are developed during different parts of the
switch operated by the relay connected in series
machine cycle, relay coils connected to and oper
with the resistance and the condenser to vary the
ated by these voltages through the lines, switch
time the charging current is applied whereby both
ing means for connecting the relays to the diiîer
ent lines, additional lines connected to the pri 65 the rate and time of charging the condenser may
be varied and the integrated charge indicated, and
mary transformer circuit, resistances connected
automatic means to delay discharge of the con
thereacross to develop voltage, means to connect
denser.
the resistance means to the relays to operate the
9. In a timing device for selectively measuring
same, switching means in this last named circuit
operated by one of said relays and indicating 70 the duration of different portions of the operating
cycle of a repetitively operating electrical machine
means operated by another of said relays.
5. In a system for measuring various time in
tervals in a complete machine cycle, some of the
connected to a power circuit, a plurality of con
ductive lines connected to the machine and the
power circuit at a plurality of points so that volt
periods being duplicates as far as machine condi
tions are concerned but appearing at different 75 ages will be developed between different lines at
2,409,888
l1
172
different instants in operation, said voltages for
two diiîerent portions of the operating cycle being
developed across the same lines, but the voltages
for the next preceding portions in each being
developed across different lines, compound switch
relay means and interposed between the first relay
ing means connected to said lines, relay means
connected to the switching means and controlled
thereby and a second relay means also controlled
by the switching means actuated in the next pre
ceding portion of the operating cycle to that be
ing measured to provide selection of the desired
interval and not the other interval deíined by the
same voltage derivation.
10. In a timing device for selectively measuring
the duration of dilïerent 'portions of the operating
cycle of a repetitively operating electrical ma
chine connected to a power circuit, a plurality of
conductive lines connected to the machine and the
power circuit at a plurality of points so that volt
ages will be developed between different lines at
different instants in operation, said voltages for
two different portions of the operating cycle being
developed across the same lines, but the voltages
for the next preceding portions in each being de
veloped across different lines, switching means
means and the first-named switching means to
selectively control the operation of the first
named relay means to differentiate between inter
vals defined by like voltage differences.
1l. In a timing device for selectively measuring
the duration of different portions of the operat
ing cycle of a repetitively operating electrical ma
chine connected to a power circuit, a plurality of
conductive lines connected to the machine and the
power circuit at a plurality of points so that volt
ages will be developed between different lines at
different instants in operation, said voltages for
two different portions of the operating cycle being
developed across the same lines, but the voltages
for the next preceding portions in each being de~
veloped across diiîerent lines, switching means
having a plurality of movable arms and each a
plurality of contacts connected to said lines, relay
having a plurality of movable arms and each a
means connected to a portion of the switching
means and controlled thereby, a second relay
means connected to a separate portion of the
switching means and controlled thereby, and fur
ther switching means controlled by the second
relay means and interposed ybetween the first relay
means and the first-named switching means, said
plurality of contacts connected to said lines, relay
second relay being operated in that portion of the
means connected to a portion of the switching
cycle preceding the one being instantly measured
means and controlled thereby, a second relay
to condition the first relay means to differentiate
means connected to a separate portion of the 30 between intervals defined by like voltage.
switching means and controlled thereby, and fur
.LACK OGDEN.
ther vswitching means controlled by the second
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