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Патент USA US3064827

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Nov. 20, 1962
R. w. ANTHONY ETAL
3,064,809
GEAR SORTING MACHINE
Filed June 27, 1960
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CLASSIFIC
STORAGE
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GEAR GAGE
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GAGE
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BY
W
IN VEN TORS
RUSSEL W. ANTHONY
JOEL M.BECKMAN JR.
ATTORQEYS
iiniteét grates
l
3364,3459
N
Egg»
Patented Nov. 20, 1962
an
the characteristic of the master gear of both the char
acteristic of the checking gear and work gear and sub
GEAR SOR'HNG MACHENE
tracting the stored signal from each of the last mentioned
Russel
Anthony, Detroit, and Joel M. Beckman, 3L,
Pontiac, Mich” assignors to National Breach & Ma
signals to produce signals representative of the departure
of the characteristic of the work gears from the character
istic of the master gear.
More speci?cally it is an object to provide means for
Fiied June 27, 196i}, Ser. No. 33,887
determining the departure of a characteristic of work gears
22 Claims. ((31. 20§—88)
from the same characteristic of a master gear compris
The invention relates to gear gauging and refers more 10 ing means for comparing the characteristic of the master
gear with the characteristic of a checking gear and de
speci?cally to a method or" and means for accurately deter
veloping an electric signal representative of the ditlerence
mining the departure of the characteristics of work gears
chine Qompany, Detroit, Mich, a corporation of
Michigan
from desired characteristics by comparing the work gears
in characteristics thereof, means for storing and repeti
and combining the results of the comparisons.
veloping electric signals representative of the sum of the
tively reproducing the developed signal, means for com
with a checking gear the characteristics of which have
previously been compared with the desired characteristics 15 paring the checking gear with each Work gear and de
departure from the characteristic of the master gear of
In the past it has been the practice to determine de
both the characteristic of the checking gear and work
parture of work gear characteristics, such as eccentricity
gear, and means for reproducing said stored signal and
or run-out and helix angle, from desired characteristics
electrically subtracting the reproduced signal from each
thereof by the use of a gear gauge for comparing the work
of the last mentioned signals to provide signals representa
gear with a master gear having the desired characteristics.
tive of the departure of the characteristic of the work gears
Due to the low tolerances in the characteristics of work
from the characteristic of the master gear.
gears that are presently demanded in industry the master
Another object is to provide apparatus as set forth
gears used for such comparisons are expensive to produce
and have a relatively short life since a small amount of 25 above wherein the departure of a plurality of separate
characteristics of work gears from the same character
wear signi?cantly effects their characteristics. In addition
istics of a master gear may be determined by comparing
gauge errors due to friction, inertia and other such causes
the characteristics of the master gear with the separate
inherent in the gear gauges used to compare the master
characteristics of a plurality of checking gears, com
gear with the work gears becomes a signi?cant factor
in the checking of gears for the extremely low tolerances 30 paring the work gears with each of the plurality of check
required.
It is therefore one of the objects of the present in
ing gears and combining the results of the comparisons
of the same checking gear to determine the departure of
vention to provide a method for determining the departure
the separate characteristics of the work gears from the
of characteristics of work gears from desired character
istics thereof without comparing a master gear with each
individual work gear.
same characteristics of the master gear.
Another object is to provide a method of and means
Another object is to provide means for determining
the departure of characteristics of work gears from de
sired characteristics thereof without comparing a master
gear with each individual work gear.
Another object is to provide a method of determining
the departure of a characteristic of work gears from the
same characteristic of a master gear comprising com
paring the master gear with a checking gear, comparing
the checking gear with the work gears and combining the
result of the comparison of the master and checking gear
with the result of each of the comparisons of the check
ing gear with a work gear.
for determining the departure of work gear characteristics
from the characteristics of a master gear as set forth above
which is simple, economical and e?icient.
Other objects and features of the invention will become
apparent as the description proceeds, especially when
taken in conjunction with the ‘accompanying drawings,
illustrating a preferred embodiment of the invention,
wherein:
FIGURE 1 is a block diagram of apparatus for check
ing gear characteristics in accordance with the method of
the invention.
FIGURES 2 and 3 are diagrammatic representations
of one type of gear gauge that may be used with the ap
paratus illustrated in FiGURE 1.
With particular reference to the ?gures, a speci?c em
departure of a characteristic of work gears from the 50
bodiment of the present invention will now be disclosed.
same characteristic of a master gear comprising means for
The gear gauging apparatus 10 illustrated in FIGURE
comparing the master gear with a checking gear, means
1 comprises means 12 for developing and storing for re
for comparing the checking gear with the work gears and
pctitive reproduction signals representative of the departure
means for combining the result of the comparison of the
master and checking gear with the result of each of the 55 of selected characteristics of a checking gear 14 from the
characteristics of a master gear 16. Apparatus 10 further
comparisons of the checking gear with a work gear.
includes a plurality of separate channels 18 and 20 for
Another object is to provide means for determining
developing signals representative of the departure of a
the departure of a chmacteristic of work gears from the
selected characteristic of work gears from the character
same characteristic of a master gear as set forth above
wherein the results of the comparisons are combined in 60 istic of a checking gear previously compared with the
Another object is to provide means for determining the
such a manner as to cancel repetitive errors such as those
due to friction, inertia and other similar phenomenon
in the gauges used for the comparisons.
More speci?cally it is an object to provide a method
of determining the departure of a characteristic of work 65
gears from the same characteristic of a master gear com
same characteristic of a master gear by means 12, for
arnplifyin<I the developed signal, and subtracting the signal
thus obtained from the reproduced stored signal developed
by the comparison of the checking gear with the master
gear, to provide signals representative of the difference in
the selected characteristic of the work gears and the same
characteristic of the master gear.
.
prising comparing the characteristic of the master gear
In addition as indicated in FIGURE 1 separate means
with the characteristic of a checking gear and produc
22 are provided in each channel 18 and 20 to receive the
ing a signal representative of the departure of the char
acteristics thereof, storing the signal thus produced, com 70 signals representative of the difference in the characteristic
of the master gear and work gears compared in the re
paring the checking gear with each work gear and produc
spective channel, to detect undesirable departures in the
ing signals representative of the sum of the departure from
3,064,809
3
4
characteristic of the master gear and work gears, and feed
delayed control signals to a gear classi?cation unit 24
operable to sort the work gears in accordance with the
departure of the characteristics of the work gears from
the characteristics of the master gear.
More speci?cally the means 12 for comparing check
ing gears with a master gear comprises a gear gauge 26,
shown diagrammatically in FIGURES 2 and 3, and a
recording, storage and reproduction unit 28. The gear
gauge 26 illustrated in FIGURES 2 and 3 is operable to 10
in the electrical arts they will not be considered in detail.
The channels 18 and 20 are similar. Channel 18 in
cludes a gear gauge 52 for measuring the run-out of work
gears with respect to a checking gear 14 which has been
compared to master gear 16 with respect to the run-out
thereof. Gear gauge 52 may therefore be similar to the
gauge 26 illustrated in FIGURES 2 and 3 with the ex? .
ception that the pivot mounting 46 for the master gear
16 and the transformer 50 are not necessary since only
the run-out of the work gears is to be compared with the
develop an electric signal representative of the eccentricity
run-out of a checking gear by means of gauge 52.
or run-out of a work gear with respect to a master gear
In the comparison a checking gear previously com
and an electric signal representative of the departure of
pared to the master gear for run-out is rotatably mounted
the helix angle of the teeth of the work gear from the
on the arm 38 in the position shown for master gear 16
desired helix angle of the teeth of the master gear.
15 while the work gears to be compared against the check
The gear gauge 26 comprises means 30 for rotatably
ing gear are mounted in the position of the checking gear
mounting a checking gear 14. A bell crank lever 32 is
14 as shown in FIGURES 2 and 3. The signals devel
pivotally secured to a ?xed support 34 by pivot means 36.
oped by the transformer of gear gauge 52 will then be
Bell crank lever 32 includes the arm 38 for pivotally and
representative of the sum of the run-out of the checking
rotatably supporting the master gear 16 in mesh with the 20 gear and the work gears with respect to the master gear.
checking gear 14 and the arm 40 for supporting for move
The electric signals produced by the transformer of
ment therewith the core ‘42 of a linear differential trans
gear gauge 52 are ampli?ed in ampli?er 54 and passed
former generally indicated 44- vfor movement therewith.
to the difference unit 56. The difference unit 56 is pro
As indicated best in FIGURE 3 the master gear 16 is
vided to subtract the reproduced signal obtained on com
mounted on arm 38 by pivot means 46 for angular move 25 parison of the checking gear used in gear gauge 52 with
ment about an axis perpendicular to its axis of rotation.
the master gear for run-out which signal has been pre
The core 48 of a second linear differential transformer
50 is secured to and extends perpendicularly from the
‘master gear 16. Core ‘48 is spaced radially outwardly
viously stored for repetitive reproduction in the storage
unit 28. It will be understood that the output of the
difference unit will therefore be electric signals repre
from the axis of rotation of master gear 16 as best shown 30 sentative of the run-out of the work gears with respect to
in FIGURE 3 and will be caused to move axially with
the master gear.
master gear 16 on pivoting of the master gear 16 about
Thus it will be evident that the apparatus thus far
pivot means 46.
described
provides means for comparing a characteristic
The gear gauge 26 is thus operable to produce an elec
of a work gear with a characteristic of a master gear
tric signal proportional to the run-out of a checking gear 35
without the necessity of comparing each different work
14 with respect to the master gear 16 on rotation of the
piece with the master gear. The useful life of a master
checking gear 14 with the master gear 16 in mesh there
gear is thus greatly increased. Also, a single master gear
may be used to provide stored repetitively reproducible
crank lever 32 to pivot about pivot mounting 36 in ac 40 signals to be used with a plurality of checking gears which
checking gears have larger tolerances than those required
cordance with the run-out of the checking gear. Arm
with. During rotation of the checking gear the master
gear 16 is caused to rotate and will cause arm 38 of bell
of a master gear for direct comparison with work gears
and are less expensive to produce than the master gears.
In addition it will be noted that since similar errors
desired electric signal representative of the run-out char
acteristic of the checking gear with respect to the master 45 which are inherent in both the gauges 26 and the gauge
52 are subtracted from each other that these inherent
gear.
errors will be removed from the ?nal di?ference signal
An electric signal proportional to the difference in helix
to produce a truer representation of the variance of the
angle of the teeth of a checking gear 14 and the master
characteristic of the work gear from the desired charac
gear 16 is developed by the transformer 50 on rotation
of the master gear 16 in mesh with the checknig gear '14 50 teristic of the master gear than was previously obtained.
Further the checking gears may be checked with the
since the master gear 16 is pivotally mounted on arm 32
master gear to provide a new signal for storing repre
by pivot means '46 so that the plane of the master gear
sentative of the departure of the characteristic of the
will move angularly with respect to the ?xed plane of
checking gear and master gear as often as desirable
rotation of the checking gear on variation of the helix
angle of the meshed teeth of the checking gear and master 55 whereby errors due to wear of the checking gear may
be greatly reduced.
gear. Angular movement of the plane of the master
As previously indicated the channel 20 is entirely simi~
gear about pivot point ‘46 causes core 48 to move longi
lar to the channel 18 with the exception of the fact that
tudinally whereby a signal proportional to the difference
the gear gauge 58 of the channel 20 is constructed to
in the helix angle of the meshed teeth of the two gears is
developed by transformer 50.
60 develop an electric signal proportional to the sum of the
variation of the helix angle of the teeth of the work gears
While a particular gear gauge 26 has been disclosed
with respect to the helix angle of the teeth of a checking
it will be understood that the gear gauge 26 as illustrated
gear which has been checked against the master gear.
in FIGURES 2 and 3 may be any other gear gauge ca
40 of bell crank lever 32 is thus caused to move whereby
the core of the transformer 44 is moved to produce the
pable of developing an electric signal proportional to the
difference in characteristics of a master gear and a gear
compared therewith.
The signal developed by gear gauge 58 is ampli?ed in
' ampli?er 60 and fed to difference unit 62.
The signal from the storage unit 28 proportional to the
sum of the variation of the helix angle of the teeth of the
corded in the storage unit 28 for subsequent repetitive
master gear and the helix angle of the teeth of the check
ing gear used in gauge 58 which has previously been stored
reproduction. The storage unit 28 may, for example, be
an endless tape having a plurality of information chan 70 in storage unit 28 is subtracted from the signal from am
pli?er 60 in difference unit 62 to produce a signal repre
nels and including read-in and read-out heads for storing
sentative of the variation in helix angle of the teeth of
and reproducing a plurality of times information received
the work gears and the teeth of the master gear.
in the form of a variable electric signal. The exact de
The signals from the difference units 56 and 62 are
tails of the storage unit 28 are not essential to the present
invention and therefore since such units are well known 75 fed to error detectors 64 and 66 respectively wherein
The signals developed by the gear gauge 26 are re
3,064,809
5
6
they are compared with reference voltages to determine
whether the di?ercnce indicated between the character
istics of the work gears and the characteristics of the
master gear is su?icient to warrant rejection of the work
any person skilled in the art to practice the invention, the
scope of which is indicated by the appended claims.
gears.
teristic of a work gear from a characteristic of a master
gear, comprising gauge means for comparing a charac
The signals from the error detectors are then
What we claim as our invention is:
1. Apparatus for determining the departure of a charac
passed to a classi?cation unit 24 through which the gears
teristic of a checking gear with the characteristic of the
after being checked by gear gauges 52 and 53 are passed.
master gear, gauge means for comparing the characteristic
The signals from the error detector 64 and 66 are delayed
of the work gear with the characteristic of the checking
by time delays 68 and 79 of the means 22 before arriving
at classi?cation unit 2.4, so that when the gears pass through 10 gear compared with the characteristic of the master gear
and comparing means operably associated with both said
the classi?cation unit 24 the gears are sorted according
gauge means for combining the results of the comparisons
to the variation of their characteristics from the charac
to produce a result representative of the departure of the
teristics of the master gear.
characteristic of the work gear from the characteristic of
The error detectors 64 and 56 and the classi?cation
the master gear.
unit 24 are well known in the art and since the details
2. Apparatus for determining the departure of a charac
thereof form no part of the present invention they will
teristic of work gears from the same characteristic of a
not be considered further in detail. For a detailed de
master gear, comprising gauge means for comparing a
scription of such apparatus reference is made to the com
characteristic of a checking gear with the characteristic
monly owned copending patent applications Serial Nos.
of the master gear, gauge means for comparing the charac
466,118, ?led November 1, 1954 (now Patent No. 2,983,
teristic of the'work gears with the characteristic of the
375) and 795,005, ?led February 25, 1959.
checking gear compared with the characteristic of the
In operation of the apparatus 19 a master gear 16 is
master gear and comparing means operably associated
?rst compared with a different checking gear id for each
with both said gauge means for combining the results of
gear characteristic which it is desired to check and the
the comparison of each work gear with the checking gear
electric signal proportional to the departure of the charac
with the result of the comparison of the checking gear
teristics of the master gear and the individual checking
with the master gear to produce results representative of
gears are placed in separate storage channels in storage
the departure of the characteristic of the work gears from
unit 28. The characteristics of the separate checking
the same characteristic of the master gear.
gears 14 which have been compared with the master gear
3. Apparatus for determining the departure or" a charac
16 are then compared with the characteristics of a plural 30
teristic of work gears from a desired characteristic of a
ity of work gears in the separate channels 18 and 2G
master gear, comprising gauge means for comparing a
to produce an electric signal representative of the sum of
characteristic of a checking gear With the desired charac
the di?erence between the compared characteristics or" the
teristic of the master gear and developing a signal repre
work gear and checking gears and the checking gears and
cc an sentative of the departure of the characteristic of the
master gear.
checking gear from the desired characteristic of the master
The stored signals are then reproduced and subtracted
gear, gauge means for comparing the characteristic of the
from the individual signals produced on comparison of
work gears with the characteristic of the checking gear
the checking gears with the work gears for the same
compared with the desired characteristic of the master
characteristics whereby individual signals are produced
representative of the departure of the characteristics of 40 gear and developing signals representative of the sum of
the departure of the characteristic of the checking gear
the work gears with respect to the same characteristics
and the characteristic of the work gears from the desired
of the master gear for each of the characteristics thereof
characteristic of the master gear for each work gear, and
checked by the di?erent checking gears. The signals thus
comparing means operably associated with both said gauge
produced are then used to sort the gears by means of the
it». in means for subtracting the ?rst mentioned signal from each
error detectors 64 and 66 and the classi?cation unit 24.
of the last mentioned signals to produce signals repre
‘It will be understood that while two characteristics of
sentative of the departure of the characteristic of the work
gears, mainly the run-out and helix angle, have been
gears from the desired characteristic of the master gear.
considered in the above disclosure that other channels
4. Apparatus for determining the departure of a char
similar to channels 13 and 29 may be used to check other
characteristics of work gears against a master gear.
Further it will be understood that when it is necessary
to synchronize the reproduction of the signals from the
storage unit with the signals produced by the gear gauges
in the di?'erence units for such characteristics as tooth
cteristic of work gears from a desired characteristic of a
master gear, comprising gauge means for comparing a
characteristic of a checking gear with the desired charac
teristic of the master gear, means operably associated with
said gauge means for developing an electric signal repre
sentative of the departure of the characteristic of the
checking gear from the desired characteristic of the master
gear, other gauge means for comparing the characteristic
at 72 in FIGURE 1.
of the work gears with the characteristic of the checking
Also while a particular embodiment of the invention
gear compared with the desired characteristic of the master
has been disclosed in which a master gear was com
pared against the checking cears to determine the de 60 gear, means operably associated with said other gauge
means for developing electric signals representative of
parture of the characteristics of the checking gears
the sum of the departure of the characteristic of the check
from the desired characteristics thereof other means for
ing gear and the characteristic of the work gears from the
developing reproducible signals representative of the de
desired characteristic of the master gear for each work
parture oi the characteristics of the checking gears with
respect to desired characteristics are possible. For ex 65 gear, and comparing means operably associated with both
said gauge means for electrically subtracting the ?rst
ample the departure of the characteristics of the check
mentioned signal from each of the last mentioned signals
ing gears from desired characteristics thereof may be de
to produce an electric signal representative of the de
termined by measurement with hand tools and later trans
parture of the characteristic of the work gears from the
lated into an electrical signal by well known means for
storage. It is the intent to include all such modi?cations 70 desired characteristic of the master gear.
5. Apparatus for determining the departure of a char
of the disclosed subject matter as may suggest them
acteristic of work gears from a desired characteristic of
selves to those in the art within the scope of the invention.
spacing that such synchronization may be provided either
mechanically or electrically as indicated diagrammaticaily
The drawings and the foregoing speci?cation constitute
a master gear, comprising gauge means for comparing a
a description of a method of and means for gear gauging
in such full, clear, concise and exact terms as to enable
characteristic of a checking gear with the desired char
acteristic of the master gear, means operably associated
8
with said gauge means for developing an electric signal
representative of therdeparture ofthe characteristic of the
checking gear from the desired characteristic of the master
gear, means for storing and repetitively reproducing ‘said
developed electric signal, other gauge means for compar
ing the characteristic of the work gears with the charac
teristic of the checking gear compared with the desired
characteristic of the master gear, means operably associ
ated with said other gauge means for developing electric
signals representative of the sum of the departure of the 10
characteristic of the checking gear and the characteristic
of the work gears from the desired characteristic of the
master gear for each work gear, and comparing means
operably associated with both said gauge means for elec
trically subtracting the reproduced ?rst mentioned signal
from each of the last mentioned signals to produce an
electric signal representative of the departure of the char
acteristic of the work gears from the desired characteristic
of the master gear.
6. Apparatus vfor determining the departure of a plu~
means for comparing the master gear and checking
gears comprises means for rotatably mounting a check
ing gear, a bell crank lever, means for rotatably and
pivotally mounting the master gear on one arm of the bell
crank lever and in mesh with the checking gear, a linear
differential transformer haxing a core secured to the other
arm of the bell crank lever for movement therewith and
a second linear differential transformer having a core
extending perpendicularly from one side of the master
gear and remote from the axis of rotation of the master
gear.
'
9. Structure as set forth in claim 7 wherein the means
for comparing said one checking gear and the work
gears comprises means for rotatably mounting a check
ing gear, a ‘bell crank lever, means for rotatably and
pivotally mounting the checking gear on one arm of the
bell crank lever andin mesh with a work gear, and a
linear di?erential transformer having a core secured to
the other arm of the bell crank lever for movement
therewith.
’
rality of characteristics of work gears from the desired
10. Structure as set forth in claim 7 wherein the means
characteristics of a master gear, comprising gauge means
for comparing said other checking gear and the Work
for comparing a different particular characteristic of a
gears comprises means for rotatably mounting a check
plurality of checking gears with the same di?erent char
ing gear, a bell crank lever, means for rotatably mount»
acteristic of the master gear and developing signals repre 25 ing the checking gear on one arm of the bell crank lever
sentative of the departure of said particular characteristics
and in mesh with a work gear, and a linear differential
from the same characteristics of the master gear, separate
transformer having a core extending perpendicularly
gauge means for comparing the particular characteristic
of each of the plurality of checking gears compared with
from one side of the master gear and remote from the
axis of rotation of the master gear.
the same characteristic of the master gear with the same 30'
11. A method for determining the departure of a
characteristic of the work gears and for developing a signal
characteristic of work gears from a characteristic of a
representative of the sum of the departure of the particu
master gear comprising comparing a characteristic of a
lar characteristic of the checking gear and the same char
checking gear with the characteristic of the master gear,
acteristic of the work gears from the same characteristic
comparing the characteristic of the work gears with the
of the master gear for each work gear, and separate ‘com 35 characteristic of the checking gear. compared with the
paring means operably associated with both said gauge
characteristic of the master gear and combining the re
means for subtracting the ?rst mentioned signal from each
sults of the comparisons to produce results representa
of the last mentioned signals due to the comparisons of the
tive of the departure of the characteristic of the work
same characteristics of the checking gear to produce sig
gears from the characteristic of the master gear.
nals representative of the departure of the characteristics
12. A method for determining the departure of a
of the work gears from the same characteristics of the
characteristic of work gears from the same characteristic
master gear.
7. Apparatus for comparing the helix angle and run
out of Work gears with respect to a master gear comprising
gauge means for comparing the helix angle of one check
ing gear and the run-out of another checking gear with the
master gear and means operably associated with said
gauge means for developing electric signals representa
tive of the run-out of the one checking'gear and the de
parture of the helix angle of the other checking gear from
the helix angle of the master gear, separate gauge means
for comparing the helix angle of the one checking gear, the
helix angle of which was compared with the helix angle of
the master gear with the helix angle of the work gears
and for determining the run-iut of the work gears with
of a master gear comprising comparing a characteristic
of a checking gear with the characteristic of the master
gear, and developing an electrical signal representative
of the departure of the compared characteristic of the
master gear and checking gear, comparing the character
istic of the work gears with the characteristic of the
checking gear compared with the characteristic of the
master gear, and developing electrical signals representa
tive of the combined departure of the checking gear and
each work gear from the desired characteristic of_the
master gear, and subtracting each of the last mentioned
signals from the ?rst mentioned signal separately to pro:
duce electric signals representative of the departure of the
characteristic of the work gears from the same character
respect to the other checking gear, and means operably
istic of the master gear.
associated with the'separate gauge means for developing
13. A method for determining the departure of a
electric signals representative of the sum of the departure
characteristic of work gears from a desired characteristic
of the helix angle of the checking gear compared with
of a master gear comprising comparing a characteristic of
the helix angle of the master gear and the helix angle
a checking gear with the desired characteristic of the
of each of the work gears and for developing electric
master gear, and developing an electrical signal repre
signals representative of the sum of the run-out of the
sentative of the departure of the compared characteristic
checking gear compared with the master gear and the
of the master gear and checking gear, storing the de
run-out of the work gears compared to the checking
veloped signal for repetitive reproduction, comparing the
gear for each work gear, and separate comparing means 65 characteristic of the work gears with the characteristic
operably associated with each of said separate gauge
of the checking gear compared with the desired char
means and said gauge‘ means for electrically substracting
acteristic of the master gear, and developing electrical
the ?rst mentioned helix angle signal from the last men
signals representative of the combined departure of the
tioned helix angle, signals and for electrically subtracting
checking gear and each work gear from the desired
the ?rst mentioned run-out signal from the last mentioned 70 characteristic of the master gear, and subtracting each of
the last mentioned signals from the reproduced ?rst
run-out signals to provide electric signals representative
mentioned signal separately to produce electric signals
of the departure of the helix angle of the work gears from
representative of the departure of the characteristic of
the helix angle of the master gear and the run-out of
the work gears with respect to the master gear.
the work gears from the desired characteristic of the
8. Structure as set forth in claim 7 wherein thegauge 75 master gear.
19
14. A method for determining the departure of a plu—
rality of characteristics of work gears from desired char
acteristics of a master gear comprising comparing a dif
ferent one of the plurality of characteristics of a separate
checking gear with the desired same characteristic of the
master gear, comparing the individual characteristics of
the work gears with the same characteristics of each of
the characteristic of the Work gears from the desired
characteristic of the master gear.
18. Apparatus ‘for determining the departure of a
characteristic of work gears from a desired characteristic
thereof, comprising means for reproducing a signal re
suiting from comparing a characteristic of a checking gear
with the desired characteristic, means for producing sig
nals resulting from comparing the characteristic of the
the checking gears compared with the same desired char
work gears with the characteristic of the checking gear
acteristic of the master gear, and combining the results
of the comparisons of the same characteristics to produce 10 and means operably associated with both said means for
combining said ?rst signal with each of said last signals
results representative of the departure of the character
to produce signals representative of the departure of the
istics of the work gears from the desired characteristics
characteristic of the work gears from the desired char
of the master gear.
15. A method for sorting gears in accordance with the
acteristic.
19. Apparatus for determining the departure of a
departure of a characteristic of the gears from a desired 15
characteristic of work gears from a desired characteristic
characteristic of a master gear comprising comparing a
thereof, comprising means for developing an electric sig
characteristic of a checking gear with the desired char
nal representative of the departure of the characteristic
acteristic of the master gear, comparing the character
of the checking gear from the desired characteristic, means
istic of the work gears with the characteristic of the
for storing and repetitively reproducing said developed
checking gear compared with the desired characteristic
electric signal, other means for comparing the character
of the master gear, and combining the results of the com
istic of the Work gears with the characteristic of the check
parisons of the Work gears and checking gear with the
ing gear, means operably associated with said other means
result of the comparison of the master gear and check
for developing electric signals representative of the sum
ing gear to produce results representative of the departure
of the departure of the characteristic of the checking gear
of the characteristic of the work gears from the desired
and the characteristic of the work gears from the desired
characteristic of the master gear, producing signals in ac
characteristic for each work gear, and means operably
cordance with the magnitude of the result of each com
associated with both the said means for electrically sub
parison, delaying the signals and operating a gear classi?er
tracting the reproduced ?rst mentioned signal from each
in accordance with the delayed signals to pass or reject
30 of the last mentioned signals to produce an electric signal
the work gears.
representative of the departure of the characteristic of
16. Apparatus for determining the departure of a
the work gears from the desired characteristic.
characteristic of work gears from a desired character
20. A method for determining the departure of a char
istic of a master gear, comprising gauge means for com
acteristic of work gears from a desired characteristic
paring a characteristic of a checking gear with the desired
characteristic of the master gear, means operably asso 35 thereof comprising comparing a characteristic of a check
ing gear with the desired characteristic, comparing the
ciated With said gauge means for developing an electric
signal representative of the departure of the character
characteristic of [the work gears With the characteristic
of the checking gear and combining the results of the
comparisons to produce results representative of the de
reproducing said developed electric signal, other gauge 40 parture of the characteristics of the work gears from the
desired characteristic.
means for comparing the characteristic of the work gears
21. A method for determining the departure of a’
with the characteristic of the checking gear compared
characteristic of work gears from a desired characteristic
with the desired characteristic of the master gear, means
thereof comprising comparing a characteristic of a check
operably associated with said other gauge means for de
veloping electric signals representative of the sum of the 45 ing gear with the desired characteristic, developing an
electrical signal representative of the departure of the de
departure of the characteristic of the checking gear and
sired characteristic and the characteristic of the check
the characteristic of the work gears from the desired
ing gear, storing the developed signal for repetitive re
characteristic of the master gear for each Work gear,
production, comparing the characteristic of the work
means operably associated with the storing means and
other gauge means for synchronizing each of the last 50 gears with the characteristic of the checking gear, and
developing electrical signals representative of the com
mentioned signals with a reproduced ?rst mentioned sig
bined departure of the checking gear and each work
nal, and comparing means operably associated with both
said gauge means for electrically subtracting the repro
gear from the desired characteristic, and subtracting each
of the last mentioned signals from the reproduced ?rst
duced ?rst mentioned signal from each of the last men
tioned signals to produce an electric signal representative 55 mentioned signal separately to produce electric signals
representative of the departure of the characteristic of
of the departure of the characteristic of the work gears
the Work gears from the desired characteristic.
from the desired characteristic of the master gear.
22. Apparatus for determining the departure of a char
17. A method for determining the departure of a
acteristic of a work gear from a desired characteristic
characteristic of Work gears from a desired character
istic of a master gear comprising comparing a character 60 thereof, comprising means for producing a signal result
ing from comparing a characteristic of a checking gear
istic of a checking gear with the desired characteristic
of the master gear, and developing an electrical signal
with the desired characteristic, means for producing sig
istic of the checking gear from the desired characteristic
of the master gear, means for storing and repetitively
representative of the departure of the compared character
nals resulting from comparing the characteristic of the
istic of the master gear and checking gear, storing the de
work gears with the characteristic of the checking gear
veloped signal for repetitive reproduction, comparing the 65 and means operably associated with both said means for
characteristic of the Work gears with the characteristic of
the checking gear compared with the desired character
istic of the master gear, and developing electrical signals
combining said ?rst signal with said last signal to produce
a signal representative of the departure of the character
istic of the work gear from the desired characteristic.
representative of the combined departure of the checking
gear and each work gear from the desired characteristic 70
of the master gear, synchronizing each of the last men
tioned signals and a reproduced ?rst mentioned signal
and subtracting each of said last mentioned signals from
said reproduced ?rst mentioned signal separately to pro
duce electric signals representative of the departure of 75
References tlited in the ?le of this patent
UNITED STATES PATENTS
1,222,392
2,821,024
Green ______________ __ Apr. 10, 1917
Nyland ______________ .._ Jan. 28, 1958
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