EP 0769132 A1 19970423 - DEVICE FOR POSITION MEASUREMENT FOR CYLINDER DRIVES
Title (en)
DEVICE FOR POSITION MEASUREMENT FOR CYLINDER DRIVES
Title (de)
VORRICHTUNG ZUR POSITIONSMESSUNG FÜR ZYLINDERANTRIEBE
Title (fr)
DISPOSITIF PERMETTANT DE MESURER LA POSITION DE SYSTEMES D'ENTRAINEMENT DE VERINS
Publication
Application
Priority
- AT 9600077 W 19960422
- AT 74595 A 19950502
Abstract (en)
[origin: WO9635098A1] If pneumatically or hydraulically actuated cylinders (1) are to be continuously positioned, a position sensor (15) must provide the controller with the current position of the piston (5). The proposed invention makes use of the moving piston rod (6) as a travel measuring system, graduations (16) being produced only by the effect of laser radiation (similar to the prior art laser printing method). A sensor (15) based on optical reflection recognises the dark graduations and light spaces and is thus able to determine the position of the piston (5). Generating the graduations pattern (16) by laser radiation directly on the surface of the piston rod (6) reduces production costs and is more environmentally acceptable than prior art photochemical processes.
IPC 1-7
IPC 8 full level
G01B 3/00 (2006.01)
CPC (source: EP)
G01B 3/004 (2013.01)
Citation (search report)
See references of WO 9635098A1
Designated contracting state (EPC)
CH DE FR GB IT LI
DOCDB simple family (publication)
WO 9635098 A1 19961107; AU 5327896 A 19961121; EP 0769132 A1 19970423
DOCDB simple family (application)
AT 9600077 W 19960422; AU 5327896 A 19960422; EP 96909920 A 19960422