Patent US3329887A successfully refreshed from Google Patents.
US3752244A
Expired / Lapsed
US
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Weight-measuring unit
Assignee: Trayvou SA
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Filing: 1972-07-20
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Granted: 1973-08-14
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Expires: 1992-07-20
Abstract
Abstract A two stage method of performing weighings of repeated dosages of granulated or powdered material in which the variations in ''''surplus'''' of the dosages are reduced by modulating, in dependence on the time taken by a ''''predosage'''' step, the rate of volume flow of the material to a weight sensing device during a second or ''''balance quantity'''' step, so as to obtain from one weighing operation to the next a substantially constant rate of flow of material by weight during the ''''balance quantity'''' step. A device for weighing repeated dosages is also described. This has a hopper adjacent the exit of which is mounted a rotatable metering drum for feeding material to a weight sensing device. A screen having an opening therein can be brought at the end of the ''''predosage'''' step into contact with the drum in order to reduce the rate of volume flow of material to the weight sensing device during the ''''balance quantity'''' step. A shutter can be adjusted relative to the screen to vary the size of the opening and is arranged to move with the screen. A cam is rotated from a start position at the beginning of each weighing operation and is stopped at the end of the ''''predosage'''' step. This cam controls the adjustment of the shutter relative to the screen and thus effects the desired modulation of the rate of flow of material by volume during the ''''balance quantity'''' step.
Inventors
- 👤 B Rouban
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:40
CPC Classifications
G; G01; G01G; G01G13/00; G01G13/02; G01G13/04
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
129 words
A method of regulating the operation of a weight-measuring unit which comprises delivering material to be weighed at a first constant rate of flow by volume in a predosage step until a predetermined major portion of the desired dosage has been delivered, and delivering the remaiNing minor portion of the desired dosage in a secon step at a second rate of flow by volume which is also constant during the said second step but less than the first constant rate, the second rate of flow by volume being modulated in proportion to the duration of the predosage step so as to maintain the rate of delivery by weight of the material during the second step at a value which is sustantially constant from one weighing operation to the next.
Claim 2
Independent Claim
129 words
A method of regulating the operation of a weight-measuring unit which comprises delivering material to be weighed at a first constant rate of flow by volume in a predosage step until a predetermined major portion of the desired dosage has been delivered, and delivering the remaiNing minor portion of the desired dosage in a secon step at a second rate of flow by volume which is also constant during the said second step but less than the first constant rate, the second rate of flow by volume being modulated in proportion to the duration of the predosage step so as to maintain the rate of delivery by weight of the material during the second step at a value which is sustantially constant from one weighing operation to the next.
Claim 3
Independent Claim
113 words
A method of weighing repeated dosages of granular or powdered material which comprises deliverying the material in a predosage step at a first substantially constant rate of flow by volume until a predetermined major portion of a dosage has been delivered, delivering the remaining minor portion of said dosage in a second step at a reduced rate of flow by volume which is constant during said second step but modulated from one operation to the other, the degree of modulation being controlled by the duration of the predosage step so that a predetermined rate of flow of material by weight is achieved during said second step, sand repeating the cycle for another dosage.
Claim 4
Independent Claim
113 words
A method of weighing repeated dosages of granular or powdered material which comprises deliverying the material in a predosage step at a first substantially constant rate of flow by volume until a predetermined major portion of a dosage has been delivered, delivering the remaining minor portion of said dosage in a second step at a reduced rate of flow by volume which is constant during said second step but modulated from one operation to the other, the degree of modulation being controlled by the duration of the predosage step so that a predetermined rate of flow of material by weight is achieved during said second step, sand repeating the cycle for another dosage.
Claim 5
Dependent Claim
150 words
A weight-measuring unit for weighing repeated dosages of powdered or granulated material, comprising weight-sensing means, supply means for supplying material along a path to said weight sensing means, screen-means interposable in said path for reducing the rate of volume flow of material to said weight-sensing means, control means responsive to said weight-sensing means to cause interposition of said screen means in said path after a predetermined major portion of said dosage has been delivered to said weight-sensing means, and modulating means for modulating, in dependence on the time taken to deliver said predetermined major portion to said weight-sensing means, the degree of reduction of the rate of volume flow of said material to said weight-sensing means so as to maintain the rate of delivery by weight of the remaining minor portion of said dosage at a value which is substantially constant from the weighing of one dosage to the next.
Claim 6
Dependent Claim
150 words
A weight-measuring unit for weighing repeated dosages of powdered or granulated material, comprising weight-sensing means, supply means for supplying material along a path to said weight sensing means, screen-means interposable in said path for reducing the rate of volume flow of material to said weight-sensing means, control means responsive to said weight-sensing means to cause interposition of said screen means in said path after a predetermined major portion of said dosage has been delivered to said weight-sensing means, and modulating means for modulating, in dependence on the time taken to deliver said predetermined major portion to said weight-sensing means, the degree of reduction of the rate of volume flow of said material to said weight-sensing means so as to maintain the rate of delivery by weight of the remaining minor portion of said dosage at a value which is substantially constant from the weighing of one dosage to the next.
Claim 7
Dependent Claim
37 words
A unit according to claim 3, in which said screen means has an opening formed therein and in which said modulating means includes movable shutter means adapted to mask said opening to a greater or lesser extent.
Claim 8
Dependent Claim
196 words
A metering device for metering repeated dosages of a granulated or powdered material to a weight-sensing device, said metering device comprising hopper means for the material, rotatable metering drum means adjacent the exit of said hopper means for feeding material from said hopper means to said weight-sensing device, movable screen means movably mounted for movement relative to the axis of said drum means between an operative position in which said screen means acts to cut off at least in part the flow of material from said hopper means to said weigth-sensing device and an inoperative position, screen actuating means responsive to a signal from said weight-sensing device when a predetermined major portion of a dosage has been delivered thereto to move said screen means from its inoperative position to its operative position, and modulating means for modulating in dependence on the time taken to deliver said predetermined major portion of to weight-sening device the degree of flow cut-off effected by said screen means in its operative position, whereby the rate of delivery by weight of the remaining minor portion of said dosage is maintained at a substantially constant value from one weighing operation to the next.
Claim 9
Dependent Claim
196 words
A metering device for metering repeated dosages of a granulated or powdered material to a weight-sensing device, said metering device comprising hopper means for the material, rotatable metering drum means adjacent the exit of said hopper means for feeding material from said hopper means to said weight-sensing device, movable screen means movably mounted for movement relative to the axis of said drum means between an operative position in which said screen means acts to cut off at least in part the flow of material from said hopper means to said weigth-sensing device and an inoperative position, screen actuating means responsive to a signal from said weight-sensing device when a predetermined major portion of a dosage has been delivered thereto to move said screen means from its inoperative position to its operative position, and modulating means for modulating in dependence on the time taken to deliver said predetermined major portion of to weight-sening device the degree of flow cut-off effected by said screen means in its operative position, whereby the rate of delivery by weight of the remaining minor portion of said dosage is maintained at a substantially constant value from one weighing operation to the next.
Claim 10
Dependent Claim
42 words
A metering device according to claim 5, in which said screen means has an opening therein for the passage of material and in which said modulating means includes movable shutter means adapted to mask said opening to a greater or lesser extent.
Claim 11
Dependent Claim
78 words
A metering device according to claim 6, in which said modulating means further includes a cam for controlling the position of said shutter means, which cam is arranged to commence rotation from a start position at the beginning of a weighing operAtion and to stop when said predetermined major portion has been delivered to said weight-sensing device, whereby the position of said cam when it stops determines the degree of masking of said opening by said shutter means.
Claim 12
Dependent Claim
155 words
A weight-measuring unit for measuring depeated dosages of powdered or granulated material comprising a weighing instrument, supply means for supplying material to the weighing instrument in a flowable stream, movable screen means movable from an inoperative position to an operative position in which said screen means cuts off partially said stream of flowable material, screen actuating means responsive to a signal from said weighing instrument when a predetermined major portion of a dosage has been delivered in a predosage step to said weighing instrument to move said screen means to said operative position, and modulating means for modulating, in dependence on the time taken to deliver said predetermined major portion to said weighing instrument, the degree of cut-off effected by said screen means in its operative position, whereby the rate of delivery by weight of the remaining minor portion of said dosage is maintained at a substantially constant rate from one weighing operation to another.
Claim 13
Dependent Claim
155 words
A weight-measuring unit for measuring depeated dosages of powdered or granulated material comprising a weighing instrument, supply means for supplying material to the weighing instrument in a flowable stream, movable screen means movable from an inoperative position to an operative position in which said screen means cuts off partially said stream of flowable material, screen actuating means responsive to a signal from said weighing instrument when a predetermined major portion of a dosage has been delivered in a predosage step to said weighing instrument to move said screen means to said operative position, and modulating means for modulating, in dependence on the time taken to deliver said predetermined major portion to said weighing instrument, the degree of cut-off effected by said screen means in its operative position, whereby the rate of delivery by weight of the remaining minor portion of said dosage is maintained at a substantially constant rate from one weighing operation to another.
Claim 14
Dependent Claim
45 words
A weight-measuring unit according to claim 8, in which said screen means is provided with an opening therein for the passage of material therethrough and in which said modulating means includes movable shutter means adapted to mask said opening to a greater or lesser extent.
Claim 15
Dependent Claim
44 words
A weight-measuring unit according to claim 8, in which said supply means includes hopper means and extractor drum means mounted adjacent the exit of said hopper means, and in which said screen means is movable towards and away from the axis of said drum.
Claim 16
Dependent Claim
89 words
A weight-measuring unit according to claim 9, in which said modulating means further includes a cam which is arranged to commence rotation from a start position at the beginning of a weighing operation and to stop when said predetermined major portion has been delivered to said weighing instrument and which has a ramp the instantaneous effective height of which is proportional to the duration of said predosage step, whereby the position of said cam when it stops determines the degree of masking of said opening by said shutter means.
Claim 17
Dependent Claim
119 words
A weight-measuring unit according to claim 11, in which said screen means and said shutter means are carried by first and second arms respectively, said first and second arms being mounted for pivoting about a common axis and said second arm being resiliently coupled to said first arm, and in which said cam acts upon a third arm also mounted for pivoting about said common axis and carrying a stop member against which said second arm may abut, whereby upon actuation of said screen means said second arm rotates with said first arm until it abuts against said stop member, the position of said stop member thereby determining the position of said shutter means elative to said screen means.
Claim 18
Dependent Claim
29 words
A weight-measuring unit according to claim 11, in which said cam is connected to a motor-brake unit by means of a clutch which is controlled by said weighing instrument.
Claim 19
Dependent Claim
25 words
A weight-measuring unit according to claim 12, in which adjustable stops are provided for regulating the latitude of displacement of said first and second arms.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |