Title:
METAL DETECTION MACHINE AND METAL DETECTION SYSTEM
Document Type and Number:
Japanese Patent JP3884141
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To judge whether a plurality of types of metals exist or not in a product and whether the amount is appropriate or not by generating a metal reaction signal in reaction to the metals and judging a signal level when a product is passed through a magnetic field and the product has the metals.
SOLUTION: A product P is carried by a conveyor C and is passed between a transmission coil and reception coils 6 and 7 of a metal detection machine 1. When a product P has a metal, the metal affects a magnetic field E and the magnetic flux of the coils 6 and 7 becomes unbalanced, a difference is generated in an inducted voltage, and a voltage signal is inputted to a differential amplifier 10. The amplified differential signal passes through a phase discriminator 12 as a metal reaction signal and is outputted to a judging means 4. A level for judging the mixture of unneeded iron is set to a judgment level d1 by a level-setting means 3, and a judgment level for sealing a needed soup bag made of aluminum is set to d2. A signal level is compared with judgment levels d1 and d2 by the judging means 4. And, the mixture of iron and presence or absence of sealing of the soup bag made of aluminum are judged based on the result and are displayed in a bar graph.
Inventors:
Tokutsu
Application Number:
JP27704797A
Publication Date:
February 21, 2007
Filing Date:
October 09, 1997
Export Citation:
Assignee:
ISHIDA CO.,LTD.
International Classes:
G01N27/72; G01V3/10; B65B57/10; G01V3/11; (IPC1-7): G01N27/72; B65B57/10; G01V3/10; G01V3/11
Domestic Patent References:
| JP57192485U | ||||
| JP3125988A | ||||
| JP8029394A | ||||
| JP7294489A | ||||
| JP59024282A | ||||
| JP3022585B2 | ||||
| JP7325159A | ||||
| JP5134054A |
Attorney, Agent or Firm:
Shuji Sugimoto
Masashi Noda
Masashi Noda