Vacuum clamping detection method and vacuum clamping detector
AssigneeKoganei Corporation
InventorYuji Takahashi
Life of this patent
Estimating the term…
Abstract
When suction/release-passage-internal pressure Pin is equal to or less than a suction detection pressure Pj, a suction of a workpiece is detected and a transfer operation is started. As long as the suction/release-passage-internal pressure Pin does not rise to pressure having an upper limit value or more of the drop detection range during a transfer, it is recognized that the workpiece is not dropped from the sucker. The drop detection range is computed by adding predetermined allowable deflection width ΔD to the suction/release-passage-internal pressure Pin that is read as reference pressure under the condition that the workpiece is sucked by the sucker.
Claims6
A suction detection method to detect whether a workpiece is sucked by a sucker having a suction/release passage connected to a negative pressure passage, the method comprising:
- a reference pressure reading step of reading, as reference pressure, pressure in said suction/release passage under the condition that the workpiece is sucked by said sucker;
- a drop-detection range setting step of setting a drop detection range by adding predetermined allowable deflection width to said reference pressure;
- a drop-detection pressure reading step of reading, as drop detection pressure, the pressure in said suction/release passage;
- a recognizing step of recognizing whether said drop detection pressure is equal to or more than an upper limit value of said drop detection range;
- and
- a drop-signal outputting step of outputting a drop signal when it is recognized that said drop detection pressure is equal to or more than said upper limit value.
A suction detection apparatus to detection whether a workpiece is sucked by a sucker having a suction/release passage connected to a negative pressure source, the apparatus comprising:
- a reference pressure reading means for reading, as reference pressure, pressure in said suction/release passage under the condition that the workpiece is sucked by said sucker;
- a drop-detection range setting means for setting a drop detection range by adding predetermined allowable deflection width to said reference pressure;
- a drop-detection pressure reading means for reading, as drop detection pressure, the pressure in said suction/release passage;
- a recognizing means for recognizing whether said drop detection pressure is equal to or more than an upper limit value of said drop detection range;
- and
- a drop-signal outputting means for outputting a drop signal when it is recognized that said drop detection pressure is equal to or more than said upper limit value.
Dependencies are inferred from the claim text.