Electromagnetically driven transport device and weighing apparatus using the same
First Claim
1. An electromagnetically driven transport device, comprising:
- a transport unit of transporting an article;
an electromagnetically driven vibrating unit for vibrating the transport unit to transport the article, the vibrating unit comprising a driving power source;
a control unit for controlling the driving power source at a plurality of driving frequencies;
a time detecting unit for detecting a time length during which a driving current of the vibrating unit of each of the driving frequencies exceeds a reference current value; and
a frequency setting unit for setting an actual driving frequency based on the time length detected by the time detecting unit.
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Accused Products
Abstract
An electromagnetically driven transport device 1 includes a transport unit 4 for transporting an article M to be transported, an electromagnetically driven vibrating unit 2 for vibrating the transport unit 1 to transport the article, a frequency controlling unit 14, a time detecting unit 15 and a frequency setting unit 16. The frequency controlling unit 14 controls a driving frequency of a driving power source 13 of the vibrating unit 2. The time detecting unit 15 detects a time length T during which when the driving frequency is changed the driving current of the vibrating unit at each of frequency exceeds a reference current value. The frequency setting unit 16 is operable to set an actual driving frequency based on the time length T detected by the time detecting unit 15.
22 Citations
11 Claims
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1. An electromagnetically driven transport device, comprising:
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a transport unit of transporting an article;
an electromagnetically driven vibrating unit for vibrating the transport unit to transport the article, the vibrating unit comprising a driving power source;
a control unit for controlling the driving power source at a plurality of driving frequencies;
a time detecting unit for detecting a time length during which a driving current of the vibrating unit of each of the driving frequencies exceeds a reference current value; and
a frequency setting unit for setting an actual driving frequency based on the time length detected by the time detecting unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
a plurality of electromagnetically driven transport devices each being of the structure as defined in claim 1; and
a weighing unit for weighing an article transported by each of the electromagnetically driven transport devices;
wherein an actual driving frequency for each of the electromagnetically driven transport devices is individually set by the frequency setting unit.
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9. A weighing apparatus comprising:
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an electromagnetically driven transport device having a structure as defined in claim 1; and
weighing means for weighing an article transported by the electromagnetically driven transport device;
wherein an actual driving frequency of the electromagnetically driven transport device is set by the frequency setting unit.
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10. An electromagnetically driven transport device comprising:
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transport means for transporting an article to be transported;
electromagnetically driven vibrating means for vibrating the transport means to transport the article;
control means for controlling the vibrating means at a plurality of driving frequencies;
time detecting means for detecting a time length during which a driving current of the vibrating means of each of the driving frequencies exceeds a reference current value; and
frequency setting means for setting an actual driving frequency based on the time length detected by the time detecting means.
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11. An electromagnetically driven transport device comprising:
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an electromagnetically driven vibrating unit for vibrating an article;
a control unit for controlling the vibrating unit at a plurality of driving frequencies;
a time detecting unit for detecting a time length during which a driving current of the vibrating unit of each of the driving frequencies exceeds a reference current value; and
a frequency setting unit for setting an actual driving frequency based on the time length detected by the time detecting unit.
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Specification