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US 5,308,930 AGranted
Weighing machine with weight detecting conveyor
AssigneeIshida Scales Mfg. Co., Ltd.
InventorsHarunori Tokutu, Shoko Tajiiri, Yukio Wakasa
Life of this patent
Estimating the term…
Abstract
A weighing machine has a weighing conveyor with a conveyor belt supported by a load cell and uses a digital filter to eliminate high-frequency components of weight signals from the weighing conveyor. In order to improve accuracy of measurement, operating conditions of the digital filter are set with regard to the length of the object to be weighed. Alternatively, time required for the object to be completely on the conveyor belt may be calculated or the timing for the zero-point adjustment for the load cell may be adjusted accordingly.
Claims18
A weighing machine comprising:
- a weighing conveyor having weight detecting means for detecting weight and a belt for transporting an object to be weighed, said belt being supported by said weight detecting means;
- data inputting means for allowing a user to input a belt speed value indicative of a speed of said belt and a length value indicative of a length of said object in a direction of transportation thereof by said belt;
- belt speed control means for controlling the speed of said belt according to said belt speed value inputted through said data inputting means;
- condition setting means for setting filtering conditions for said object on a basis of said belt speed value and said length value inputted from said data inputting means;
- and
- digital filter means or digitally filtering weight signals from said weight detecting means under said filtering conditions set by said condition setting means.
3 more elements
A weighing machine comprising:
- a weighing conveyor having weight detecting means for detecting weight and a belt for transporting an object to be weighed, said belt being supported by said weight detecting means;
- object detecting means disposed at an object-receiving end of said weighing conveyor for detecting said object to be weighed;
- data inputting means for allowing a user to input a length value indicative of a length of said object in a direction of transportation thereof by said belt;
- detection inhibiting time calculating means for determining detection inhibiting tim by calculating transportation time from said length value inputted through said data inputting means and a speed value indicative of a speed of said belt;
- and
- detection inhibiting means for causing detection signals from said object detecting means to be ignored until said detection inhibiting time elapses from when said object detecting means detects a front end of said object to be weighed.
3 more elements
A weighing machine comprising:
- a weighing conveyor having weight detecting means for detecting weight and a belt for transporting an object to be weighed, said belt being supported by said weight detecting means;
- object detecting means disposed at an object-receiving end of said weighing conveyor for detecting said object to be weighed;
- detection inhibiting time setting means for measuring output time of detection signals from said object detecting means when said object to be weighed is transported onto said weighing conveyor and storing said output time as detection inhibiting time corresponding to a length of said object in a direction of motion of said belt;
- and
- detection inhibiting means for causing detection signals from said object detecting means to be ignored until said detection inhibiting time elapses from when said object detecting means detects a front end of said object to be weighed.
2 more elements
A weighing machine which normally performs zero-point adjustment, said weighing machine comprising:
- a weighing conveyor having weight detecting means for detecting weight and a belt for transporting an object to be weighed, said belt being supported by said weight detecting means;
- condition setting means for calculating filtering conditions for said object from a speed of said belt and a length of said object in a direction of transportation thereof;
- digital filter means for receiving control signals from said condition setting means to thereby digitally filter weight signals from said weight detecting means;
- and
- zero-point adjustment inhibiting time calculating means for calculating zero-point adjustment inhibiting time from a length of said weighing conveyor, the speed of said belt, the length of said object in the direction of transportation thereof and said filtering conditions, said weighing machine being prevented from performing zero-point adjustment during said zero-point adjustment inhibiting time.
2 more elements
A weighing machine comprising:
- a weighing conveyor having weight detecting means for detecting weight and a belt for transporting an object to be weighed, said belt being supported by said weight detecting means;
- condition setting means for setting filtering conditions for said object on a basis of a time length during which said object to be weighed is on said belt;
- and
- digital filter means for digitally filtering weight signals from said weight detecting means under said filtering conditions set by said condition setting means.
1 more element
Dependencies are inferred from the claim text.