Patent ID: 7359764
Filing Date: 2008-04-15
Classification: C03B,Y10T

Abstract:
1. A system for positioning a pair of carriages in spaced relationship to one another, comprising: a first drive arrangement acting on a first carriage to move the first carriage along a first reciprocating path; a second drive arrangement acting on a second carriage to move the second carriage along a second reciprocating path; a first position measuring device for measuring positions of the first carriage along the first reciprocating path and for generating a first position signal indicating position of the first carriage on the first reciprocating path; a second position measuring device for measuring positions of the second carriage along the second reciprocating path and for generating a second position signal indicating position of the second carriage on the second reciprocating path; a motion detector positioned relative to the first and second reciprocating paths to generate a first reference signal as the first carriage moves past the detector and to generate a second reference signal as the second carriage moves past the detector; and electronics for