| 摘要 |
A cylinder stroke position measurement device for enabling common use of a rotation sensor unit in measurement of a cylinder stroke position by detecting an amount of rotation of a rotary roller by means of a rotation sensor. A cylinder is provided at its head portion with a base member 300 having an opening accommodating at least a rotary roller and a rotation sensor section. A pressing member, the rotary roller, and the rotation sensor section are held on one side of a sensor holding member, while a coupling member for example is provided on the opposite side of the sensor holding member, thus constituting a rotation sensor unit. The sensor holding member is attached to the base member such that the rotary roller and the rotation sensor section are accommodated in the opening of the base member 300. The rotary roller is pressed by the pressing member against the surface of a rod. The rotation sensor section detects an amount of rotation of the rotary roller. The coupling member electrically couples the rotation sensor section with an external signal line.
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