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Патент USA US2406897

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‘Sept. 3, ‘1.946.
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Filed 001;. 8, 1943
4 Sheets-Sheet l
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Sept. 3, 1946.‘
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Filed Oct. 8, ‘1945
4 Sheets-Sheet 2
Sept. 3, 1946.
A, 5, PAGE
Filed Oct. 8, 1943
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4 Sheets-Sheet 3
Sept.‘3, 1946.
Filed Oct° 8, 1943
4 sheetsésheet 4
A/‘l-ed Braver/674'
Patented Sept. 3, 1946
Alfred Ernest Page, Birmingham, England, as
signor to W. &
T. Avery Limited, Birmingham,
Application October 8, 1943, Serial No. 505,438
In Great Britain October 29, 1942
6 Claims.
This invention has reference to improvements
in automatic weighing apparatus embodying a
totalizing mechanism, and has for its object to
provide a relatively simple mechanism which will
afford a means of coupling and uncoupling the
weighing mechanism and the totalizing mecha
nism at the requisite periods, the mechanism be
ing of a robust character and incorporating only
the minimum number of parts so that the risks o!
breakdown or of any defect arising in the mech
anism are reduced to a minimum. A further ob
jective of the present invention is the incorpora
tion in the apparatus of a plurality of visible sig
nals which indicate stages in the loading, weigh
ing, and unloading operations of the apparatus.
The invention consists of an automatic weigh
ing apparatus incorporating a totalizing mech~
anism wherein means are provided for effecting a
mechanical coupling between a rotatable weighing
member and a measuring unit, said measuring
unit being connected to a mechanically operated
means for transmitting the motion of the weigh
ing member to a totalizing counter, the measur
ing unit incorporating a spring coupling which
(Cl. 235-91)
The invention will now be described with refer
ence to the accompanying drawings, in which:
Fig. 1 is a diagrammatic perspective lay-out
showing the essential features of the mechanism
comprising the present invention, the parts being
shown in the position they would occupy When a
load is being weighed and measured.
Fig. 2 is a rear face elevation of one practical
embodiment of the mechanism illustrating the
parts in the position they would occupy when
there is no load on the weighing platform, that is,
the mechanism is free to effect a weighment.
Fig. 3 is a part sectional side elevation of the
mechanism seen in Fig. 2 looking on the right
hand side of that ?gure, the section being taken
on the spindle or axis of the weight indicator.
Fig. 4 is a detailed view showing the wound
spiral spring coupling which obtains between the
weighing and measuring units in the neutral po
Fig. 5 is a front elevation of a signal device ca
pable of illumination and adapted to be asso
ciated with the apparatus, which device also in
corporates the weight totalizer or counter and a
admits of a degree of relatively free motion of 25 weight
printing device.
part of the unit during the period when the un
first the illustration of the inven
coupling of the weighing apparatus and the meas
tion as shown in Fig. 1 of the drawings which
uring unit takes place.
may be said to illustrate its application to a plat
The invention further consists in the provision
weighing machine incorporating an auto
of a wound spiral spring coupling between the 30
matic resistant to the load such as a pendulum or
weight indicator and a weighing wheel or clutch
calibrated springs, the load is communicated
member to admit of the wheel or member being
the aforesaid resistance to a weight in
rotated in a reverse direction without involving
dicating pointer a which moves over and in rela
a similar or return motion of the weight indicator
when the indicator is maintained or held in an in 35 tion to a graduated chart I) which forms part of
a circular dial with which the pointer registers.
dicative position by a load on the weighing ap
The invention further consists in the embodi
The pointer a is provided with an integral arm
a1 which is connected to one end of a light wound
spring 0, the other end of which is connected to
the hub 031 of a wheel cl hereinafter termed the
weighing wheel. The wheel d is adapted to move
in synchrony with the pointer a through the afore
ment in the apparatus of a plurality of visible sig
nals, say light signals interconnected with switch
control circuits in the mechanism, one or more
of said switches being positively operated in syn
chreny with the rotation of an electric motor
which is the power unit for controlling the cycle
of the mechanism of the apparatus, said signals
indicating time stages in the sequence of opera
tions indicating when the load may be applied,
said connection.
Mounted on 2. spoke of the
.weighing wheel 0! are projections 012 and (113 ex
tending from opposite faces of the wheel. The
timed sequence of the various operations.
projection d2 is adapted to contact with the free
or extending end of the arm a1 While the projec
tion d3 is adapted to be contacted by an arm here
inafter termed the long arm e1 which extends
from a cylindrical collar e freely rotatably mount
The invention is further comprised in certain
operative parts of the mechanism to eifect the
ed on a spindle f. The collar e is also provided
with a short arm extension e2 which is adapted
aforesaid coupling and uncoupling at the periods
when the weighing member is stationary as will
an aligned cylindrical collar 9 mounted on the
weighed and removed, so as to ensure the proper
be more particularly hereinafter described.
to contact with another arm 91 extending from
spindle f, the inner end face of the collar 9 abut
ting the inner end face of the collar e. These two
lar e on which is provided the pair of divergent
collars e and g are connected together by means
arms 61 e2 of different lengths. This rotary mo
of a relatively strong wound spring h which e?fects
tion is effected in an anti-clockwise direction
a de?nite coupling between the two collars. Rig~
from the neutral or starting point adjacent one
idly connected to the collar 9! is a pirlon i which
face of the stop .9. This rotary motion causes the
meshes with a rack j which. in turn is pivotally CR short armv e2 which is in contact with the arm
connected through a connecting rod 70 to a crank
91 to travel together with the arm 91 as a coupled
icl by means of which reciprocating motion is im
unit until the longer arm e1 associated with the
parted to the rack a‘ from a driving shaft Z on
collar e contacts with the projection d3 from the
which the crank is mounted, the shaft I being 10 one face of the weighing wheel cl. From this
connected through sprocket wheel and chain
point the measurement of the amount of the
transmission to a motor m or other source of
weighment takes place and is transmitted to the
power. On the shaft 1 is mounted a cam 11, on
totalizing counter 7‘ through the measuring wheel
the periphery of which bears an anti-friction
q which has in the interim been brought into
roller 01 which is freely mounted in the lower end
peripheral contact with the weighing wheel cl
of a spring-loaded member 0, shown in Fig. 1 as
through the action of the cam n and the spring
a cranked arm pivoted on a pin ‘o3. Mounted in
loaded buffer rod 0. Motion is transmitted.
the upper part of the member 0 is one end of a
shaft p on which is mounted a wheel q herein
after termed the measuring wheel adapted at
times to be brought into contact or mesh with the
periphery of the weighing wheel d resiliently con
nected to the index pointer 11. The shaft p is con
nected by a sprocket wheel (12 and chain trans
mission with the shaft p1 provided with a bevel
pinion coupling for the operation of a totalizing
counter 'r. A stop s is provided to determine the
one limit of the position of the longer arm 61
extending from the collar e which stop is employed as a definite locating member as will here
inafter appear in connection with the description
of the operation of the mechanism.
When the load is placed on the platform of the
machine the pointer a moves round to the load
position. in a clockwise direction as indicated by
the dotted arrow on the right-hand side of Fig.
l; at the same time as this movement of the
pointer takes place the arm a1 moves through the
through the sprocket wheel and chain gearing to
the totalizing counter r from the shafts p and p1.
Now the two spring associated collars e and g
and the projections e1 e2 and g1 forming parts
thereof and the weighing wheel d move in an
anti-clockwise direction as one connected unit
until the longer arm 61 strikes or approaches the
rear face of the stop 5 as indicated in dotted lines
in this ?gure.
From this point the continued
anti-clockwise rotation can only obtain in re
spect of the collar 9 Which has not been checked
or held by any abutment of the arm g1 with the
stop 3 and thus the collar 9 and plniOn'Z can now
rotate further in an anti-clockwise direction (say
through an angle of approximately 30“) which
motion is permitted by the provision or interposi
tion of the wound spring coupling 71. obtaining be“
tween the collars e and 9 so as to provide what
may be termed a degree of overdrive and a period
of lag during which the cam-controlled mech~
anism can function to admit of the measuring
wheel q falling from contact with the weighing
the light spiral spring 0 rotates the weighing
wheel at, that is, the wheels at and q become dis
wheel (2 which is adapted to move in synchrony
connected or declutched.
with the pointer a, the degree of rotation of this
If. the load is still on the platform of the weigh
weighing wheel d being the same as that imparted
ing machine then the pointer a and the integral
to the pointer a. This follower motion of the
arm a1 associated therewith remain in or substan
weighing wheel at through the light spiral spring
45 tially in the load position, but if the load has been
0 is determined or limited by the projection (12
removed from the machine, then the pointer a
coming into or being maintained in contact with
and the arm a1 move back to the zero position
same are as the pointer and in so doing through
the arm a1 extending from the index pointer a
due to the fact that there is no pull exerted on
or following in contact therewith. This position
the weighing mechanism from the load, and
which may be termed the load position of the
therefore no resistance to such return motion.
weight indicating parts is the position from which 50
A reversal of the direction of motion of the rack
measurement is to be effected, which measure
i now obtains due to the stroke of the crank k1
ment is to be communicated through gearing to
when the arms e1 e2 and g1 respectively associated
the totalizing counter r to afford an indication or
with the collars e and g which have re-contacted
record of the weighment in numerals or digits.
back in a clockwise direction to their start
During this weighing operation the measuring 55 travel
ing position at which position the arm 61 asso“
wheel q is declutched or freed of the weighing
ciated with the collar 6 is located in adjacency to
wheel (I so that during the weighing operation the
the front face of the stop 5, the parts being now
load has only to rotate the index pointer 11 and
in a position to e?ect the next weighing and
through the light spiral spring 0 the weighing
measuring sequence.
wheel at associated therewith, whereby no con
It will be appreciated from the foregoing de
nection obtains between the weighing mechanism
scription that the mechanism thus affords a de
and the measuring unit or totalizing counter.
gree of free motion at the coupling end, that is,
When the weighing operation has been com~
prior to the commencement of the actual meas
pleted i. e. the index pointer a has come to a po
sition of rest a starter button in the circuit of
the motor m is pressed and the motor rotates the
cam shaft lthrough the sprocket wheel and chain
transmission which rotation of the cam shaft Z ef~
fects a reciprocating motion of the rack 7' through
the crank 7c1 and connecting rod 7c. The rack is 70
?rst lifted and rotates the pinion i meshing there—
with, the pinion in turn rotating the collar 9
which is connected thereto. This rotation is im
parted through the relatively strongv wound spring
connection it from the collar (7 to the aligned col
uring operation, and that the spring coupling it
between the two collars e and g and the Spring
loading of the buffer rod 0 permits of a degree of
relatively free motion at the uncoupling end i. e.
following‘ the completion of the measuring or to
talizing operation during which period uncoupling
or declutching of the wheels (1 and q obtains.
The spring coupling between the index pointer
a and the weighing wheel or clutch member d and
the coiled spring resistance between the power
driven unit and the measuring unit provide for
a resilient coupling between the measuring unit
and the weighing wheel or outer clutch member.
n1 mounted on the cam shaft 1, whereby at pre
determined periods in the sequence of each cycle
hus an over-run is provided for the measuring
unit which will admit of the completion of the
a circuit through the motor m and through the
totalizing record and 0f the subsequent declutch
ing motion required between the clutch members
q and d without involving any strain upon or
signalling device when this is associated with
the apparatus. A plurality of switches u may be
control the diiferent circuits
through the signal lamps or other devices.
It will not be necessary having regard to the
aforesaid description of the diagrammatic illus
tration of the invention (Fig. 1) to describe in
detail the mechanism illustrated in Figs. 2, 3,
and 4 of the drawings as similar reference letters
mechanism seen in Fig. 1.
The weighing wheel or outer clutch section cl
has through a. wound spiral spring 0 connection
measuring or totalizing operation.
These periods of operation involving loading,
be driven from the weighing mechanism by a
conventional rack and pinion drive a3. Mounted
on the spindle by means of a ?anged collar a2
is the arm a1 which is adapted to be associated
with the arm d2 connected to the weighing wheel
or outer clutch section (1, the section it being
connected to the arm d2 by means of the sleeve
d‘*. The outer section of the clutch d carries the
projection d3 which corresponds to the short arm
cl3 in Fig. 1.
Within this outer section of the
clutch d is located the internal expandible inner
35 part or the clutch corresponding to the measur
ing wheel q which expandible part is rotatably
located partially within the sleeve J‘ which corre~
sponds to the spindle f in Fig. 1. Rotatable on
the sleeve 1‘ is the pinion sleeve 9 formed integral
with the pinion z‘. The expandible section of the
clutch comprises the three radially disposed arms
Q1 Which each incorporate a coiled compression
spring 02 which serve the function of the spring
loaded arm 0 (Fig. 1), this section of the clutch
is expanded by means of the slidable taper-ended
the position of the index pointer a and if re
quired the digits of the totalizing counter 1.
spindle a: which is longitudinally moved as a
Referring now more particularly to the practi
cal embodiment of the invention illustrated in
part by Figs. 2 to 5 of the drawings, this embodi 501lower end of the rod 0 which is depressed by the
ment is modi?ed in certain details of the mech
anism from the diagrammatic illustration de
scribed in relation to Fig. l of the drawings; for
section of the clutch corresponding to the weigh
ing wheel 01.
Moreover the collar 6 and parts
arm 91 is directly associated with the arm or
projection d3 extending from the clutch wheel or
mechanism a pivotally mounted rockable seg
ment which is designated 7'1 in Fig. 2 of the draw
ings, this segment being rocked by means of a
contact with and
expand the clutch pins q1 against the resistance
of the coiled springs 02, the outer ends of the
pins q1 being thus maintained in abutment with
the inner periphery of the outer section d of the
clutch. The measuring clutch member q is rigid
ly connected by the sleeve 1‘ to the sprocket wheel
(12 forming part of the transmission to the totaliz
ing counter r.
The pivotally mounted toothed segment 1'1
which pivots about the pin 7'3 is rocked by means
spring-loaded telescopic plunger rod which is
of the telescopic plunger rod generally designated
substituted for the connecting rod 70 in Fig. 1.
7c, the upper end of which is pivotally connected
at 9'2 to the carrier arm of the toothed segment 11.
This telescopic plunger rod embodies an inner
or lower section 702 which is spring-loaded by
means of the coiled compression spring h located
within the outer tubular part of the plunger is,
the lower end of the part 702 of this plunger being
connected by means of the pivot pin 704 to the
This modi?ed practical construction
of the invention also illustrates‘ the embodiment
of a tipping mercury switch u which is rocked
by means of the lever .w, one end of which is in
contact with the periphery of an auxiliary cam
cam 72, so that rotation of the cam will effect a
reciprocable motion of the plunger rod is and an
arcuate rocking motion of the toothed segment
{i1 which meshes with the pinion i which forms
part oi‘ the sleeve of.
Referring now to Figs. 2 to 41 in association
with Fig. 5 of the drawings, Fig. 5 illustrates a
I claim:
1. In an automatic weighing apparatus com
prising a totalizing mechanism, in combination,
a load-responsive member, weighing mechanism
for positioning the load-responsive member in
accordance with the weight of the load, said
weighing mechanism having a lost-motion. con~
signalling device to be associated with the appa
nection with the load~responsive member, ?exible
ratus which can be illuminated and which also
resilient means for normally taking up the lost
illustrates the incorporation of a printing mechm
motion in said connection, a driving member,
anism for a tape or ticket record. This signalling
which normally is out of engagement with the
device is arranged in circuit from the motor m
load-responsive member, for moving the load
and comes into operation after the commence“
responsive member in a direction that is the re
ment of the cycle of operation dependent upon
verse of the direction in which it is moved by
the application of the load to the machine. A
application of a load, means for actuating the
mercury tipping switch or switches such as is
driving member to move the load-responsive
designated a controls the circuit through the sig
member from a load-responsive position back to
nalling device indicating when the load may be
its normal no-load position, and a driven member,
applied to the platform of the apparatus and this
for operating the totalizing mechanism, which is
switch is automatically brought into operation
brought by said actuating means into driven en
to close the switch circuit through the rotation
of the cam. 11.1 at a period subsequent to the com.»
mencement of the weighing operation. This sig»
is that oi the arrow device on. the left-hand
gagement with the load-responsive member prior
to engagement of the driving member with the
load-responsive member.
2. In an automatic weighing apparatus com
side oi Fig. 5. in addition it will be observed that
a totalizing mechanism, in combination,
there are two other signal lamps, one at the centre
a load-responsive member that is positioned in
or the panel indicating that the apparatus is not
accordance with the weight of the load, a driving
to be touched, and another on the right-hand
movable into positive abutment with the
side of the panel which indicates when the load
load-responsive member in a direction that is the
may be removed, that is upon the completion of
reverse of the direction in which the load-respon
the cycle of operation of the apparatus which is
sive ‘member is moved by application of a load,
determined by one complete rotation of the cam
the normal position of the driving member being
shaft Z. There is also incorporated on the panel
beyond the range of movement of the load
a transparent disc t which may be illuminated
responsive member, means for actuating the driv
to afford a visual indication of the weight indi~
ing member to move the load-responsive member
cator and part of the graduated chart or dial 1)
from a load-responsive position back to its normal
associated therewith for the purpose of indicat
no~load position, and a driven member, for oper
ing when required a test position or the mecha~
ating the totalizing mechanism, which is brought
nism whereby at any time a check may be effected
by said actuating means into driven engagement
and visual indication afforded that the mecha~
with the load-responsive member during the
nism is in a balanced position. The panel which
initial movement of the driving member before
carries the signalling device may also be utilised
it enters the range of movement of the load
as indicated in Fig. 5 to provide a mounting for
the weight totalizer or counter T and for a print
ing mechanism '0 which latter provides in known
responsive member, whereby engagement of the
driven member before engagement of the driving
manner a means of obtaining a record of the 4:5 member is ensured.
3. A device in accordance with claim 2 com»
weight and other data on a tape or ticket. Al
prising a positive stop which is engaged by the
though the totalizer 1", shown in Figure 1, may
driving member as the load-responsive member
be mounted on the signalling panel, it may also
reaches its no~load position.
be mounted in another position and therefore is
4. A device in accordance with claim 2 in which
not shown in Figure 5. The printing mechanism
the actuating means, after actuating the driving
and the totalizing mechanism are independently
member to move the load-responsive member
geared to the transmission from the operative
back to its no-load position, operates to disengage
part or". the mechanism.
the driven member and then to return the driving
A full rotation of the index pointer a is approx
member in the opposite direction to its normal
imately through 300“ but the arm. or projection
571 (Figs. 2 and 3) attached to the pinion i is per
5. A device in accordance with claim 2 which
mitted a driven travel of approximately 330° thus
comprises a lost-motion driving connection be
giving an excess movement of 30° to this arm or
tween the actuating means and the driving mem—
ber, and ?exible resilient means for normally
to provide a safety period to ensure that the
taking up the lost motion in said connection, and
weighing pointer a has come to rest. Thus there
in which the actuating means, after actuating
is provided an arbitrary margin for the connect
the driving member to move the load-responsive
ing or clutching motion between the members (I
member back to its no-load position, operates to
and q avoiding the necessity for the power driven
disengage the driven member and then to return
mechanism associated with the measuring or
the driving member in the opposite direction to
projection, which additional movement is utilised
totalizing part of the apparatus and the weighing
mechanism to be clutched together and start
its normal position.
totalizing at the same moment.
load-responsive member and the driven member
The stop 5 in
this embodiment of the invention is adjustable
and takes the form of a bell-crank lever pivoted 70
on the pin s1, the one arm of the bell-crank being
controlled or adjusted in its initial setting by
means of the screw adjustment 52.
6. A device according to claim 2 in which the
form the engageable members of a clutch.
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