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GB2314139A - Shaft encoder with adjustable backlash compensation - Google Patents

Shaft encoder with adjustable backlash compensation Download PDF

Info

Publication number
GB2314139A
GB2314139A GB9612341A GB9612341A GB2314139A GB 2314139 A GB2314139 A GB 2314139A GB 9612341 A GB9612341 A GB 9612341A GB 9612341 A GB9612341 A GB 9612341A GB 2314139 A GB2314139 A GB 2314139A
Authority
GB
United Kingdom
Prior art keywords
encoder
leadscrew
slot
backlash
drive pin
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.)
Withdrawn
Application number
GB9612341A
Other versions
GB9612341D0 (en
Inventor
Michael Smith
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB9612341A priority Critical patent/GB2314139A/en
Publication of GB9612341D0 publication Critical patent/GB9612341D0/en
Publication of GB2314139A publication Critical patent/GB2314139A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/12—Couplings for rigidly connecting two coaxial shafts or other movable machine elements allowing adjustment of the parts about the axis
    • 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
    • G01D5/3473—Circular or rotary encoders
    • G01D5/34738—Axles; Driving or coupling means

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Transform (AREA)

Abstract

To overcome the problem of backlash in a shaft encoder, the shaft encoder disc 3 rotates on its own bearing 2 and is driven by a pin of a drive pin assembly 5, 6 which cooperates with a slot in the shaft encoder disc. The length of this slot is equal to the backlash of a leadscrew 13. Rotating the leadscrew in one direction causes the drive pin to drive the encoder disc 3 producing an output from the encoder. When the direction of rotation of the leadscrew 13 is reversed the pin will move in the slot and as the length of this slot is equal to the backlash there will be no output until the backlash has run out and the drive pin will once again drive the encoder disc producing an output. The number of slots on the disc depends on the pitch of the leadscrew.

Description

SHAFT ENCODER WITH ADJUSTABLE BACKLASH COMPENSATION This invention relates to a shaft encoder with adjustable backlash compensation to suit any leadscrew, the encoder disc is not fixed to the leadscrew shaft but is free to rotate on its own bearing plate, the number of slots in the encoder disc is dependent on the pitch of the leadscrew. The encoder disc is driven by the pin on the drive pin assembly and operates in the bananna slot. When the leadscrew is reversed the pin moves in the bananna slot and no output will occur from the encoder untile the backlash as run out, when the backlash as run out the drive pin will rotate the encoder disc and there will be an output from the encoder.
A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawings in which Fig 1 shows the assembled encoder package.
Fig 2 shows 2 the encoder disc bearing plate Fig 3 shows 3 the encoder disc with adjustable bananna slot and 6 the slot adjustment mechanism Fig 4 shows the drive pin assembly 5 and the allan grub screw which locks the assembly to the drive pin carrier Fig 5 shows the drive pin assembly carrier 10 and the drive pin assembly Fig 6 shows the shaft extension 11 with the drive pin carrier 10 with the key 14 that locks the drive pin carrier to the shaft extension and the leadscrew 13. The key 15 is for the handwheel Fig 7 shows the opto-slotted switch housing 9 and the output plug 8.
Refering to Fig 1 it will be seen that the encoder comprises of 1. The housing and 12. The housing endcover, the encoder disc bearing plate 2 which in turn held to the inside of the housing by screws 16 that go into tapped holes in the housing.
The encoder disc 3 fits on the encoder disc bearing plate and is free to rotate the number of slots in the encoder disc is dependent on the pitch of the leadscrew. The encoder disc also has a adjustable bananna slot whose adjusted length is equal to the backlash of the leadscrew, the encoder disc is driven by the drive pin assembly 5. The drive pin operating in the bananna slot. The drive pin assembly 5 is held on the drive pin carrier 10 by the allan grub screw 4.
The drive pin carrier 10 is attached to the shaft extension 11 and the leadscrew 13 by the key 14 which also transferes the rotary motion from the leadscrew to the shaft extension and the drive pin carrier.
The encoder discs slots move between an opto-slotted switch 7 which comprises of an infrared transmitter and an encoder reciever housed in 9. This encoder produces two outputs 1. A clock pulse and 2. Direction of rotation information, these two outputs are fed to the electronic package via the 4 pin plug 8. The other two pins carry + - to the encoder and infrared transmitter.

Claims (1)

  1. The encoder disc is housed on its own bearing plate and is free to rotate, the encoder disc has an adjustable bananna slot whose adjusted length is equal to the backlash of the leadscrew and is driven by the pin on the drive pin assembly, this pin operates in the adjusted bananna slot.
GB9612341A 1996-06-13 1996-06-13 Shaft encoder with adjustable backlash compensation Withdrawn GB2314139A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9612341A GB2314139A (en) 1996-06-13 1996-06-13 Shaft encoder with adjustable backlash compensation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9612341A GB2314139A (en) 1996-06-13 1996-06-13 Shaft encoder with adjustable backlash compensation

Publications (2)

Publication Number Publication Date
GB9612341D0 GB9612341D0 (en) 1996-08-14
GB2314139A true GB2314139A (en) 1997-12-17

Family

ID=10795213

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9612341A Withdrawn GB2314139A (en) 1996-06-13 1996-06-13 Shaft encoder with adjustable backlash compensation

Country Status (1)

Country Link
GB (1) GB2314139A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2776374A1 (en) * 1998-03-23 1999-09-24 Bosch Syst Freinage PARTIAL RACE SENSOR
WO2010003845A1 (en) * 2008-07-10 2010-01-14 Dr. Johannes Heidenhain Gmbh Rotary transducer and series of rotary transducers
CN102101251B (en) * 2009-12-17 2013-01-23 武汉重型机床集团有限公司 Position detection and control device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB801222A (en) *
GB733960A (en) * 1953-06-23 1955-07-20 Devoge & Co Ltd Improvements in or relating to jacquard machines
GB819062A (en) * 1954-12-21 1959-08-26 Int Computers & Tabulators Ltd Improvements in or relating to shaft position indicating apparatus
GB1357816A (en) * 1970-10-15 1974-06-26 Appalachian Electronic Instr Run-in meter
US4894533A (en) * 1985-10-07 1990-01-16 Hiraku Abe Optical rotary encoder
US5176085A (en) * 1988-12-23 1993-01-05 Mitsubishi Denki K.K. Position detecting device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB801222A (en) *
GB733960A (en) * 1953-06-23 1955-07-20 Devoge & Co Ltd Improvements in or relating to jacquard machines
GB819062A (en) * 1954-12-21 1959-08-26 Int Computers & Tabulators Ltd Improvements in or relating to shaft position indicating apparatus
GB1357816A (en) * 1970-10-15 1974-06-26 Appalachian Electronic Instr Run-in meter
US4894533A (en) * 1985-10-07 1990-01-16 Hiraku Abe Optical rotary encoder
US5176085A (en) * 1988-12-23 1993-01-05 Mitsubishi Denki K.K. Position detecting device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2776374A1 (en) * 1998-03-23 1999-09-24 Bosch Syst Freinage PARTIAL RACE SENSOR
EP0945703A1 (en) * 1998-03-23 1999-09-29 Bosch Systemes de Freinage Partial stroke detector
WO2010003845A1 (en) * 2008-07-10 2010-01-14 Dr. Johannes Heidenhain Gmbh Rotary transducer and series of rotary transducers
US8146259B2 (en) 2008-07-10 2012-04-03 Dr. Johannes Heidenhain Gmbh Rotary encoder and series of rotary encoders
CN102101251B (en) * 2009-12-17 2013-01-23 武汉重型机床集团有限公司 Position detection and control device

Also Published As

Publication number Publication date
GB9612341D0 (en) 1996-08-14

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)