US3666080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conveyor belt system
Assignee: Santrade Ltd
•
Filing: 1969-11-14
•
Granted: 1972-05-30
•
Expires: 1989-11-14
Abstract
Abstract A system is disclosed for controlling the discharge of articles from a steel belt conveyor. When articles are placed on the belt at the loading station, the belt is magnetized at a high intensity in a very small area which has a predetermined relationship, longitudinally of the belt, to the position of the article on the belt. The magnetized spot is also positioned transversely of the belt in accordance with the station where the article is to be discharged. At each discharge station there is an arrangement in the form of a plow and means to move the plow to and from the path of articles carried on the belt so as to deflect the articles from the belt. The plow operating mechanism has an electronic control which includes a Hall-effect transducer positioned adjacent the bottom surface of the belt and relatively positioned transversely of the belt along the path of the magnetized spots for that station. Hence, when an article is placed on the belt and the magnetized spot is produced corresponding to a particular unloading station. The article will be carried to that station and unloaded. The high intensity magnetization is produced by an electromagnet extending transversely from the bottom surface of the belt, and direct current is supplied to the electromagnet coil from a condenser circuit. The current can be caused to flow in either direction through the coil so as to produce a magnetized zone or spot of either north or south polarity. The magnetized zone or spot is surrounded by a ring of the opposite polarity but of insufficient intensity to energize the Hall-effect control unit. The number of discharge stations may be increased by producing two or more magnetized spots for various of the discharge stations.
Inventors
- 👤 Stig Allan Junior Alfredsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:50
CPC Classifications
B; B65; B65G; B65G47/00; B65G47/34; B65G47/46; B65G47/48; B65G47/49; B65G47/50; B65G47/503
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
138 words
In a conveyor system, the combination of, a steel belt conveyor having a load carrying run extending from a loading station along a path which passes a plurality of discharge stations, magnetic means at said loading station to produce discrete magnetized zones of high intensity and of single polarity in said belt with the magnetic field extending perpendicular to the belt surfaces with each zone having a selected position with respect to one edge of said belt, and discharge control means including detector means for each of said discharge stations, said detector means including a Hall-effect transducer positioned to detect only the perpendicularly extending magnetic field of said magnetized zones, said control means being operative to discharge products from said belt at a particular one of said discharge stations in accordance with the respective detection of magnetized zones.
Claim 2
Dependent Claim
138 words
In a conveyor system, the combination of, a steel belt conveyor having a load carrying run extending from a loading station along a path which passes a plurality of discharge stations, magnetic means at said loading station to produce discrete magnetized zones of high intensity and of single polarity in said belt with the magnetic field extending perpendicular to the belt surfaces with each zone having a selected position with respect to one edge of said belt, and discharge control means including detector means for each of said discharge stations, said detector means including a Hall-effect transducer positioned to detect only the perpendicularly extending magnetic field of said magnetized zones, said control means being operative to discharge products from said belt at a particular one of said discharge stations in accordance with the respective detection of magnetized zones.
Claim 3
Dependent Claim
167 words
In a conveyor system, the combination of, an endless steel belt having a run extending from a loading station along a path which passes a plurality of discharge stations, magnetizing means for said loading zone to produce discrete magnetized signal zones each of which comprises a high intensity magnetized zone of single polarity with the magnetic field extending perpendicular to the belt surfaces and a zone of substantially lesser magnetic intensity radially outwardly from said highly magnetized zone, said highly magnetized zone having a selected position with respect to one edge of said belt, and discharge means including means at each of said discharge stations including detector means which is positioned with respect to said edge of said belt so as to be responsive to only the perpendicularly extending magnetic field of one of said high intensity magnetic zones and control means responsive to said detector means to discharge products at each of the discharge stations in accordance with the respective detection of high intensity magnetized zones.
Claim 4
Dependent Claim
167 words
In a conveyor system, the combination of, an endless steel belt having a run extending from a loading station along a path which passes a plurality of discharge stations, magnetizing means for said loading zone to produce discrete magnetized signal zones each of which comprises a high intensity magnetized zone of single polarity with the magnetic field extending perpendicular to the belt surfaces and a zone of substantially lesser magnetic intensity radially outwardly from said highly magnetized zone, said highly magnetized zone having a selected position with respect to one edge of said belt, and discharge means including means at each of said discharge stations including detector means which is positioned with respect to said edge of said belt so as to be responsive to only the perpendicularly extending magnetic field of one of said high intensity magnetic zones and control means responsive to said detector means to discharge products at each of the discharge stations in accordance with the respective detection of high intensity magnetized zones.
Claim 5
Dependent Claim
17 words
A system as described in claim 2 wherein said magnetizing means produces circular high intensity magnetizing zones.
Claim 6
Dependent Claim
25 words
A system as described in claim 2 wherein said detector means comprises a Hall effect transducer positioned adjacent to the bottom surface of said belt.
Claim 7
Dependent Claim
162 words
In a conveyor system, the combination of an endless conveyor belt having the characteristics that it is magnetizable and positioned with a conveying run extending from a loading station along a path which passes a plurality of discharge stations, magnetizing means for said loading station to produce discrete magnetiZed signal zones in the belt each of which comprises a magnetic field of single polarity extending perpendicular to the belt surfaces, each of said magnetized zones having a selected position with respect to one edge of the belt and a position longitudinally of the belt relative to the material which is being carried by the belt along said conveying run, and discharge means for the materials including means at each of said discharge stations to discharge the material and detector means which is responsive only to the perpendicularly extending magnetic field of each magnetized zone and control means to operate said discharge means in response to a signal received from said detector means.
Claim 8
Dependent Claim
162 words
In a conveyor system, the combination of an endless conveyor belt having the characteristics that it is magnetizable and positioned with a conveying run extending from a loading station along a path which passes a plurality of discharge stations, magnetizing means for said loading station to produce discrete magnetiZed signal zones in the belt each of which comprises a magnetic field of single polarity extending perpendicular to the belt surfaces, each of said magnetized zones having a selected position with respect to one edge of the belt and a position longitudinally of the belt relative to the material which is being carried by the belt along said conveying run, and discharge means for the materials including means at each of said discharge stations to discharge the material and detector means which is responsive only to the perpendicularly extending magnetic field of each magnetized zone and control means to operate said discharge means in response to a signal received from said detector means.
Claim 9
Dependent Claim
32 words
A conveyor system as described in claim 5 wherein said belt is of steel and wherein said magnetizing means and said detector means are positioned beneath said belt along said conveying run.
Claim 10
Independent Claim
112 words
The method of controlling the delivery of products from a steel belt conveyor which comprises the steps of, magnetizing a discrete spot on the belt with a high intensity magnetic field extending perpendicular to the belt surfaces within a zone at a predetermined distance from a side edge of the belt which has been designated to correspond with a particular discharge station, detecting the arrival of only the perpendicularly extending magnetic field of the spot at said discharge station by a Hall-effect transducer positioned adjacent the bottom surface of the belt, and removing the product from the belt at said discharge station in response to the signal produced by said Hall-effect transducer.
Claim 11
Independent Claim
112 words
The method of controlling the delivery of products from a steel belt conveyor which comprises the steps of, magnetizing a discrete spot on the belt with a high intensity magnetic field extending perpendicular to the belt surfaces within a zone at a predetermined distance from a side edge of the belt which has been designated to correspond with a particular discharge station, detecting the arrival of only the perpendicularly extending magnetic field of the spot at said discharge station by a Hall-effect transducer positioned adjacent the bottom surface of the belt, and removing the product from the belt at said discharge station in response to the signal produced by said Hall-effect transducer.
References Cited (Backward Citations)
US2784851A
Cited
US3019385A
Cited
US3084784A
Cited
US3173533A
Cited
US3214003A
Cited
US3275123A
Cited
US3219909A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |