Patent ID: 9217448
Filing Date: 2015-12-22
Classification: F15B,G01D

Abstract:
1. A cylinder position measuring device for measuring a position of a linearly moving member that linearly moves inside a cylinder tube, comprising: a stroke position sensor for detecting a stroke position of the linearly moving member; a magnet disposed on the linearly moving member; a magnetic force sensor disposed outside the cylinder tube; a stroke end abutment detecting system for detecting an abutment of the linearly moving member to a stroke end; an arithmetic processing portion configured to perform a correction process to reset an original position of the stroke position by using a detection value of the magnetic force sensor according to a movement of the linearly moving member while the linearly moving member is not abutted to the stroke end, and not to perform the correction process at least about a first correction process after the abutment when the linearly moving member has been abutted to the stroke end.