Taiyo Fishery Co., Ltd.

Kabushiki Kaisha Tetrak

Kiyoshi Kajiwara

Koji Kojima

Tahiko Inukai

Takahiko Kagawa

Minoru Maruyama

Michio Nonaka

There is disclosed a method for inspecting leakage of a sealed container which is effectively used for detecting a leaking place such as a pin hole, crack, etc. of a sealed container which contains foods, pharmaceuticals, chemical industrial products, etc. A method for inspecting leakage of a sealed container according to the present invention comprises changing an internal pressure of a vacuum chamber provided with an eddy-current displacement sensor to a predetermined degree of vacuum from a normal pressure after putting a sealed container to be inspected having a conductive material on at least at a portion of the container in the chamber; detecting an amount of expansion of the sealed container at the degree of vacuum in time sequence by the eddy-current displacement sensor; and determining any change in the amount of expansion after a time when the detected amount of expansion shows the maximum value, thereby to determine any pin hole formed in the sealed container.

Method for inspecting leakage of sealed container

An inverter-type resistance welding machine includes a keyboard for inputting desired welding current command data corresponding to commanded values, a display unit for displaying, in the form of a numerical table or graph, the welding current command pattern data inputted by the keyboard, a memory for storing a plurality of the welding current command patterns set by the keyboard and from which these patterns are read out in response to a selection command from the keyboard to serve as a control command of the inverter, and acceptability decision means which successively accepts detected welding current at the time of welding for making a comparison with the reference welding current command pattern over a full range of values, checking correlation between the detected welding current and the reference welding current command pattern and determining whether the detected welding current lies within a predetermined tolerance.

Controller for resistance welding machine

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Tokyo, Japan

Kiyoshi Kajiwara