Weighing scales – With weigher loading or unloading means
Patent
1993-01-07
1994-10-25
Fuller, Benjamin R.
Weighing scales
With weigher loading or unloading means
177121, 177123, 318 68, 318747, 318749, 318801, 318 41, G01G 1900, G01G 1302, H02P 140
Patent
active
053591542
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an inverter controlled conveying/measuring apparatus and, more particularly, it relates to an inverter controlled conveying/weighing apparatus of the type which is suitably applicable to a weighing/sorting machine capable of automatically weighing objects while conveying them and sorting them depending on the weight data obtained for the objects.
BACKGROUND ART
As well known, there are systems for used in various production lines incorporating weighing/sorting machines (so called auto-checker) for automatically weighing objects (works) while they are being conveyed and sorting them depending on the weight data obtained for the objects.
Some of the basic requirements for such systems include high speed, enhanced accuracy and improved reliability.
A weighing/sorting machine of the type as described above normally comprises as principal components a number of conveyors including a feeding conveyor, a weighing conveyor and a sorting conveyor. These conveyors are required to have a reduced size, durability, a high torque and stability particularly in terms of the conveyor drive/control system including the motor in order to meet the above requirements for the machine.
It is a recognized fact that any conveyors of conventional weighing/sorting machines do not satisfy the above requirements.
Some of the reasons for this are discussed below.
FIG. 36A of the accompanying drawings illustrates the configuration of a conventional weighing/sorting machine, where reference numeral 1 denotes a feeding conveyor driven by motor M1 at a given speed to move the objects placed on it at a required rate under the control of a control unit 2.
Reference numeral 3 denotes a weighing conveyor for weighing one by one the objects W fed in by the feeding conveyor 1 while they are moved further on, said conveyor being also driven by a given speed by motor M2 to move the objects on it at a required rate under the control of a control unit 5.
Reference numeral 6 denotes a sensor for detecting object W being transferred to the weighing conveyor 3 and reference numeral 7 denotes a sorter circuit for assigning the object W to a specific group of objects by transmitting a sorting signal after the elapse of a given period of time since the object is completely transferred to the weighing conveyor 3 or a period of time required to obtain a stabilized weight signal for the object.
Reference numeral 8 denotes a sorting conveyor for assigning the object W coming from the weighing conveyor a specific route corresponding to the sorting signal given to it and causing it to be moved away by a guide device 9 which is operated in accordance with the sorting signal. For instance, the weighed objects W may be divided into three different groups and collected at the ends of three different routes.
Like the two other conveyors, the sorting conveyor 8 is driven by motor M3 at a given speed to moving the objects on it at a required rate under the control of a control unit 10.
The three motors M1, M2 and M3 to be used for diving the respective conveyors are single-phase induction-type brushless motors that can be realized in small dimensions and withstand continuous operation for a prolonged period of time. The rotary speed of the motors M1, M2 and M3 can be modified by changing the level of the voltage of power applied to them by means of the respective control units 2, 5 and 10.
The three conveyors are normally operated at a same speed with a view to minimize the vibration that may be generated in the machine to adversely affect the operation of the weighing conveyor 3 as well as the time required for it to receive an object and weigh it.
Therefore, the object which is brought to the feeding conveyor 1 is moved at a predetermined constant speed to the weighing conveyor, weighed there and then sorted by weight while it is moved away from the location of weighing.
The object transferred from the weighing conveyor 3 to the sorting conveyor 8 is guided to its proper take-out position by the sorting signal generated
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Fujimoto Hideya
Horikoshi Kazuhiko
Kikuchi Kunio
Tanaka Osamu
Tsukasa Fumihiro
Anritsu Corporation
Fuller Benjamin R.
Gibson Randy W.
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