METHOD OF RETURNING TO ORIGIN

Title:

METHOD OF RETURNING TO ORIGIN

Document Type and Number:

WIPO Patent Application WO/1990/001188

Kind Code:

A1

Abstract:

A method of returning a mechanical moving part to origin using a linear scale only but without using a limit switch. The linear scale (1) is provided with a second scale portion (2) for specifying a deceleration starting position and an original position in addition to first scale portions (3, 4) that generate two-phase signals for detecting the position. Signals (S1, S2) that represent a deceleration starting position (D) and an original position (O) are generated from the second scale portion (2), the quick-feed speed (Va) for return to origin is decelerated to a speed (Vb) for return to origin using the deceleration start signal (S1), and movement is stopped in response to the original position signal (S2) to return to the original.

Inventors:

SAKAMOTO KEIJI (JP)
USHIYAMA SHIGEYUKI (JP)
TANIGUCHI MITSUYUKI (JP)
KIKUCHI HIROFUMI (JP)

Application Number:

PCT/JP1989/000743

Publication Date:

February 08, 1990

Filing Date:

July 26, 1989

Export Citation:

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Assignee:

FANUC LTD (JP)

International Classes:

G05D3/12; G01D5/244; G01D5/245; G05B19/23; G05B19/416; (IPC1-7): G05D3/12

Foreign References:

JPH0516186A	1993-01-26
JPH05776607A
JPS58206366A	1983-12-01
JPH05873803A
JPH06298217A	1994-10-25
JPS62144024A	1987-06-27

Other References: