Datasheet

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No problem occurred during the test, but adsorption becomes unstable after starting operation.
[Possible causes]
• Setting of the vacuum switch is not appropriate. Supply pressure is unstable. Vacuum pressure does not reach the set
pressure.
• There is leakage between the workpiece and the vacuum pad.
[Remedy]
1) Set the pressure for the vacuum equipment (supply pressure, if using an ejector) to the necessary vacuum pressure during
the adsorption of the workpieces. And set the set pressure for the vacuum switch to the necessary vacuum pressure for
adsorption.
2) It is presumed that there was leakage during the test, but it was not serious enough to prevent adsorption. Revise the
vacuum ejector and the shape, diameter, and material of the vacuum pad.
Revise the vacuum pad.
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Adsorption becomes unstable after replacing the pad.
[Possible causes]
• Initial setting conditions (vacuum pressure, vacuum switch setting, height of the pad) have changed. Settings have changed
because the pad was worn out or had permanent setting due to the operating environment.
• When the pad was replaced, leakage was generated from the screw connection part, or the engagement between the pad
and the adapter.
[Remedy]
1) Revise the operating conditions including vacuum pressure, the set pressure of the vacuum switch, and the height of the
pad.
2) Revise the engagement.
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Identical pads are used to adsorb identical workpieces, but some of the pads cannot adsorb the
workpieces.
[Possible causes]
• There is leakage between the workpiece and the vacuum pad.
• The supply circuit for the cylinder, the solenoid valve and the ejector is in the same pneumatic circuit system. The supply
pressure decreases when they are used simultaneously. (Vacuum pressure does not increase)
• There is leakage from the screw connection part or the engagement between the pad and the adapter.
[Remedy]
1) Revise the pad diameter, shape, material, vacuum ejector (suction flow rate), etc.
2) Revise the pneumatic circuit.
3) Revise the engagement.
∗ In principle, vacuum pads are molded using a die. Therefore, there is minimal variance in dimensions between products.
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The workpiece cannot be separated from the pad. The workpiece sticks to the rubber part of the
bellows.
[Possible causes]
• The adhesiveness of the rubber material is high. Adhesiveness increases due to the operating environment (wearing of the
pad, etc.).
• Vacuum pressure is higher than necessary, so excessive force (adhesiveness of the rubber + vacuum pressure) is applied to
the pad (rubber part).
[Remedy]
1) Revise the shape, material, and quantity of vacuum pads.
2) Reduce the vacuum pressure. If inadequate lifting force causes a problem in transferring the workpieces due to the
reduction of vacuum pressure, increase the number of pads, or select pads with larger diameter.
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Non-conformance Examples
Model Selection
Front matter 29