Electric discharge machine and sensor unit
AssigneeSodick Co., Ltd.
InventorMasashi Sakaguchi
Life of this patent
Estimating the term…
Abstract
An electric discharge machine is provided. The electric discharge machine includes: an axis drive part moving a tool electrode in at least one axial direction; and a sensor unit detecting a linear movement position of the axis drive part in the axial direction. The sensor unit includes a measurement scale having a linear shape, a position detector scanning the measurement scale and obtaining position information, and a pair of adjustment blocks fixed to both ends of the measurement scale or the position detector and erected perpendicular to an extension direction of the measurement scale. The adjustment blocks are fixed to the axis drive part and are curved in the axial direction due to a temperature change.
Claims5
An electric discharge machine, comprising:
- an axis drive part, configured to move a tool electrode in at least one axial direction;
- and
- a sensor unit, configured to detect a linear movement position of the axis drive part in the at least one axial direction,
- wherein the sensor unit comprises:
- a measurement scale, having a linear shape;
- a position detector, configured to scan the measurement scale and obtain position information;
- and
- a pair of adjustment blocks, being fixed to both ends of the measurement scale or the position detector and erected perpendicular to an extension direction of the measurement scale,
- wherein each of the pair of adjustment blocks comprises a first block and a second block made of different materials, being joined with each other through a fastening surface, and
- wherein each of the pair of adjustment blocks is fixed to the axis drive part and is curved in the at least one axial direction due to a temperature change,
- wherein an internal stress is generated in the fastening surface due to a difference in coefficient of thermal expansion between the first block and the second block, and the adjustment block is curved due to a bimetal effect.
A sensor unit, comprising:
- a measurement scale, having a linear shape;
- a position detector, configured to scan the measurement scale and detect a linear movement position of an object to be measured in at least one axial direction;
- and
- a pair of adjustment blocks, being fixed to both ends of the measurement scale or the position detector and erected perpendicular to an extension direction of the measurement scale,
- wherein each of the pair of adjustment blocks comprises a first block and a second block made of different materials, being joined with each other through a fastening surface, and
- wherein each of the pair of adjustment blocks is fixed to the object to be measured and is curved in the at least one axial direction due to a temperature change, wherein an internal stress is generated in the fastening surface due to a difference in coefficient of thermal expansion between the first block and the second block, and each of the pair of adjustment blocks is curved due to a bimetal effect.
Dependencies are inferred from the claim text.