GB2022843A - Determining Carriage Position - Google Patents

Determining Carriage Position

Info

Publication number
GB2022843A
GB2022843A GB7919681A GB7919681A GB2022843A GB 2022843 A GB2022843 A GB 2022843A GB 7919681 A GB7919681 A GB 7919681A GB 7919681 A GB7919681 A GB 7919681A GB 2022843 A GB2022843 A GB 2022843A
Authority
GB
United Kingdom
Prior art keywords
carriage
arm
sensor
optical sensor
indication
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB7919681A
Other versions
GB2022843B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Smiths Group PLC
Original Assignee
Smiths Group PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Smiths Group PLC filed Critical Smiths Group PLC
Priority to GB7919681A priority Critical patent/GB2022843B/en
Publication of GB2022843A publication Critical patent/GB2022843A/en
Application granted granted Critical
Publication of GB2022843B publication Critical patent/GB2022843B/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/347—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells using displacement encoding scales
    • G01D5/34776—Absolute encoders with analogue or digital scales
    • G01D5/34792—Absolute encoders with analogue or digital scales with only digital scales or both digital and incremental scales

Abstract

The position of a carriage 5 along an arm 4 is determined by an inductive sensor 7 and an optical sensor 10. The carriage carries two spaced coils 11 and 12 energised with out of phase alternating signals that induce current in a coil 17 of the inductive sensor mounted on the arm, the phase difference of the induced current varying with movement of the carriage. The optical sensor is mounted on the carriage and senses light reflected from markings along an encoded strip 40 extending along the arm. The output of the optical sensor is in digital form and gives an indication of that portion of the arm within which the carriage is located. The phase difference of the current in the sensor coil is also derived in digital form and this gives an indication of the location of the carriage within that portion of the arm. <IMAGE>
GB7919681A 1978-06-06 1979-06-06 Determining carriage position Expired GB2022843B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7919681A GB2022843B (en) 1978-06-06 1979-06-06 Determining carriage position

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7826425 1978-06-06
GB7919681A GB2022843B (en) 1978-06-06 1979-06-06 Determining carriage position

Publications (2)

Publication Number Publication Date
GB2022843A true GB2022843A (en) 1979-12-19
GB2022843B GB2022843B (en) 1982-09-02

Family

ID=26267917

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7919681A Expired GB2022843B (en) 1978-06-06 1979-06-06 Determining carriage position

Country Status (1)

Country Link
GB (1) GB2022843B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0077163A2 (en) * 1981-10-08 1983-04-20 United Kingdom Atomic Energy Authority Transducers for providing an electrical signal representative of physical movement
US4490914A (en) * 1982-01-15 1985-01-01 Dr. Johannes Heidenhain Gmbh Error correction system for position measuring instruments
US4982509A (en) * 1988-08-19 1991-01-08 Delta International Machinery Corp. Measurement system having multiple display orientations

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0077163A2 (en) * 1981-10-08 1983-04-20 United Kingdom Atomic Energy Authority Transducers for providing an electrical signal representative of physical movement
EP0077163A3 (en) * 1981-10-08 1985-09-04 United Kingdom Atomic Energy Authority Transducers for providing an electrical signal representative of physical movement
US4490914A (en) * 1982-01-15 1985-01-01 Dr. Johannes Heidenhain Gmbh Error correction system for position measuring instruments
US4982509A (en) * 1988-08-19 1991-01-08 Delta International Machinery Corp. Measurement system having multiple display orientations

Also Published As

Publication number Publication date
GB2022843B (en) 1982-09-02

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee