| 摘要 |
PURPOSE:To enable a constant needling depth to be obtained by using a transplanting needle as an electrode and detecting a contact between the transplanting needle and a culture medium by an electric signal. CONSTITUTION:When a petri dish 10 is carried to a prescribed position by a transport conveyor 16, the petri dish 10 is positioned by holding means 18a and 18b. After a positioning, an electrode 20 is inserted into a culture medium 12 and then a transplanting needle 30 is lowered to the culture medium 12 by an arm 32. A power supply 42 and a variable resistor 44 are connected to the electrode 20 and the transplanting needle 30 by a lead wire 40. Since the culture medium 12 has a high moisture content, the presence or absence of conduction is detected by a detector 50 and a detection threshold can be changed by adjusting the resistor 44. Accordingly, even though a scattering is present in a distance between the tip of the transplanting needle 30 and the culture medium 12, an always constant needling depth can be obtained by a simple mechanism wherein the transplanting needle 30 is utilized as the electrode and the electric conduction generated when the transplanting needle is brought into contact with the culture medium is detected.
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