Single channel encoder
AssigneeXerox Corporation
InventorGeorge H. Urich
Life of this patent
Estimating the term…
Abstract
An apparatus is provided for generating a pulse train, the apparatus comprising a member having a plurality of spaced marks disposed thereon with at least one of the spaced marks being a reference mark. The member is in communication with means for generating the pulse train as the plurality of spaced marks move. Additionally, the pulse train has a periodicity defined by the same edge of two successive pulses and the plurality of spaced marks are configured so that the periodicity of the pulse train remains constant.
Claims12
An apparatus for generating a pulse train having a plurality of timing pulses, comprising:
- a member having a plurality of spaced marks disposed thereon with one of the spaced marks being a reference mark having a leading edge and a trailing edge;
- and
- means, in communication with said member, for generating the pulse train as the plurality of spaced marks move, the pulse train being defined by a series of durations, each of the durations having a periodicity defined by the same edge of two successive pulses, the plurality of spaced marks being configured so that the periodicity of each duration remains constant throughout the pulse train and said generating means forms a reference pulse from the reference mark as the leading and trailing edges of the reference mark are moved adjacent the generating means, the reference pulse occurring during one of the durations and serving as one of the timing pulses.
In a printing apparatus of the type having a moving photoconductive member, an apparatus for generating a pulse train defined by a plurality of timing pulses occurring respectively in a series of durations, comprising:
- a disk having a plurality of spaced marks disposed thereon with one of the spaced marks being a reference mark having a leading edge and a trailing edge, wherein the plurality of spaced marks are substantially colinear and configured so that the periodicity of the durations are substantially equal;
- means for coupling said disk with the photoconductive member so that said disk moves in unison with the photoconductive member;
- and
- means, in communication with said disk, for generating the pulse train as the plurality of spaced marks move, a reference pulse being generated each time the leading and trailing edges of the reference mark are detected by said generating means, the reference pulse occurring during one of the durations and serving as one of the timing pulses.
An apparatus for generating a pulse train defined by a plurality of timing pulses occurring respectively in a series of durations, comprising:
- a photoconductive member having a plurality of spaced marks disposed thereon with one of the spaced marks being a reference mark with a leading edge and a trailing edge, wherein the plurality of spaced marks are substantially colinear and configured so that the periodicity of the durations are substantially equal;
- and
- means, in communication with said photoconductive member, for generating the pulse train as the plurality of spaced marks move, a reference pulse being generated each time the leading and trailing edges of the reference mark are detected by said generating means, the reference pulse occurring during one of the durations and serving as one of the timing pulses.
A method for generating a pulse train defined by a plurality of timing pulses occurring respectively in a series of durations, said method being adapted for use with a member having a plurality of spaced marks disposed thereon with one of the spaced marks being a reference mark with a leading edge and a trailing edge, said method comprising the steps of:
- generating the pulse train by moving the plurality of spaced marks adjacent means for generating the pulse train, the pulse train being defined by a series of durations, each of the durations having a periodicity defined by the same edge of two successive pulses;
- configuring the plurality of the spaced marks so that the periodicity of the pulse train remains constant;
- and
- generating a reference pulse as the leading and trailing edges of the reference mark are moved adjacent the generating means, the reference pulse occurring during one of the durations and serving as one of the timing pulses.
Dependencies are inferred from the claim text.