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EP0500116A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Position detecting apparatus

Assignee: Toshiba Tec Corp
•
Filing: 1992-02-20
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Granted: —
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Expires: 2012-02-20
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Abstract

Abstract A position detecting apparatus comprises a motion detecting section (1, 3) for generating a pulse when a carriage (CA) passes each of coordinate points set in a reciprocal movement span thereof at a predetermined pitch, and a counting section (5) for storing position data representing an initial position of the carriage (CA) in advance, incrementing the position data in response to a pulse which is generated by the motion detecting section (1, 3) when the carriage (CA) is moved in the forward direction, and decrementing the position data in response to a pulse which is generated by the motion detecting section (1, 3) when the carriage (CA) is moved in the backward direction. Particularly, the position detecting apparatus further comprises a position data correcting section (2, 4) for controlling the counting section (5) to correct the position data when the carriage (CA) is moved in the backward direction so that the position data represents a position shifted in the forward direction by a predetermined amount and to cancel the correction when the carriage (CA) is moved in the forward direction.

Inventors

  • 👤 Shigenori Ueno

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 20:25
CPC Classifications
B; B41; B41J; B41J19/00; B41J19/18; B41J19/20; B41J19/202; B41J19/205; B41J19/207

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 179 words
A position detecting apparatus comprising: motion detecting means (1, 3) for generating a pulse when a carriage (CA) passes each of coordinate points set in a reciprocal movement span thereof at a predetermined pitch; and counting means (5) for storing position data representing an initial position of the carriage (CA) in advance, incrementing the position data in response to a pulse which is generated by said motion detecting means (1, 3) when the carriage (CA) is moved in a first direction, and decrementing the position data in response to a pulse which is generated by said motion detecting means (1, 3) when the carriage (CA) is moved in a second direction; characterized in that said position detecting apparatus further comprises position data correcting means (2, 4) for controlling the counting means (5) to correct the position data when the carriage (CA) is moved in the second direction so that the position data represents a position shifted in the first direction by a predetermined amount and to cancel the correction when the carriage (CA) is moved in the first direction.
Claim 2
Dependent Claim 93 words
A position detecting apparatus according to claim 1, characterized in that said position data correcting section includes reverse detecting means (4) for detecting that the moving direction of said carriage (CA) is reversed, said counting means is arranged to decrement the position data in response to a detection signal supplied from said reverse detecting means (4) when the carriage (CA) moves in the second direction, and to increment the position data in response to a detection signal supplied from said reverse detecting means (4) when the carriage (CA) moves in the first direction.
Claim 3
Dependent Claim 97 words
A position detecting apparatus according to claim 2, characterized in that said motion detecting means includes a linear encoder (1) for generating a 2-phase signal of first and second waves which alternately change in level when said carriage (CA) passes each of the coordinate points set at a predetermined interval, and one of which is advanced in phase than the other according to the moving direction of said carriage (CA), and pulse generating means (3) for generating a pulse in response to a level change in each of the first and second waves of said 2-phase signal.
Claim 4
Dependent Claim 48 words
A position detecting apparatus according to claim 3, characterized in that said linear encoder is composed of a plate (PL) having a plurality of slits representing said coordinate points and an encoder sensor (1a) mounted on said carriage (CA) for detecting the slit as said carriage (CA) moves.
Claim 5
Dependent Claim 40 words
A position detecting apparatus according to claim 3, characterized in that said position data correcting means includes direction detecting means (2) for detecting the moving direction of said carriage (CA) from the 2-phase signal supplied from said linear encoder (1).

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