Apparatus for controlling reference position of paper in a multiple-time recorder and control method thereof

Claim 1

An apparatus for controlling a reference position of a recording paper in a multiple-time recorder in which a driving mechanism drives the recording paper relative to a recording head for recording on said recording paper in a forward or backward paper-feed direction by unit incremental steps, in which a counter is provided to count the incremental steps, and in which multiple-time recordings are superimposed on a single sheet of said recording paper by aligning the relative position between said recording paper and said head to a predetermined reference position at each recording of the multiple-time recordings, said apparatus comprising: a sensor for measuring a physical property of said recording paper at points coming within a measuring field of said sensor, said sensor having an output and being located in a position which is fixed in the paper-feed direction relative to said recording head; means for initialization to reset said counter to 0 (zero) when the recording paper is driven by said driving mechanism to said reference position before commencement of a first recording; means for preparing n data of f (i) processed from the output of said sensor at counts 0, 1, 2, . . . i . . . (n-1) of said counter, where n is an arbitrary integer determinable by design and f(i) is the processed data corresponding to count i of said counter, and storing these processed data f (i) in a reference data memory at address i before commencement of said first recording; means for preparing n+k+l data of g(j) processed from the output of said sensor at points from -k to n+l-1 (where k and l are respectively arbitrary integers determinable by design, j is an integer from -k to n+l-1 and g(j) is the processed data corresponding to count j of said counter), and storing these processed data g(j) in a compared data memory at address j, after completing said first recording and before commencing second and subsequent recordings; means for calculating a cross correlation between functions f(i) and g(i+d), where f (i) is data at address i of the reference data memory, g(i+d) is data at address i+d of the compared data memory, d is an address shift which is an integer from -k to +l, and storing a calculated result at address d of a correlation memory; means for determining an address value δ in said correlation memory at which the highest correlation value is stored; and means for positioning the recording paper at a position where said counter indicates δ, and resetting the counter to 0.

Claim 2

An apparatus for controlling a reference position of a recording paper in a multiple-time recorder in which a driving mechanism drives the recording paper relative to a recording head for recording on said recording paper in a forward or backward paper-feed direction by unit incremental steps, in which a counter is provided to count the incremental steps, and in which multiple-time recordings are superimposed on a single sheet of said recording paper by aligning the relative position between said recording paper and said head to a predetermined reference position at each recording of the multiple-time recordings, said apparatus comprising: a sensor for measuring a physical property of said recording paper at points coming within a measuring field of said sensor, said sensor having an output and being located in a position which is fixed in the paper-feed direction relative to said recording head; means for initialization to reset said counter to 0 (zero) when the recording paper is driven by said driving mechanism to said reference position before commencement of a first recording; means for preparing n data of f (i) processed from the output of said sensor at counts 0, 1, 2, . . . i . . . (n-1) of said counter, where n is an arbitrary integer determinable by design and f(i) is the processed data corresponding to count i of said counter, and storing these processed data f (i) in a reference data memory at address i before commencement of said first recording; means for preparing n+k+l data of g(j) processed from the output of said sensor at points from -k to n+l-1 (where k and l are respectively arbitrary integers determinable by design, j is an integer from -k to n+l-1 and g(j) is the processed data corresponding to count j of said counter), and storing these processed data g(j) in a compared data memory at address j, after completing said first recording and before commencing second and subsequent recordings; means for calculating a cross correlation between functions f(i) and g(i+d), where f (i) is data at address i of the reference data memory, g(i+d) is data at address i+d of the compared data memory, d is an address shift which is an integer from -k to +l, and storing a calculated result at address d of a correlation memory; means for determining an address value δ in said correlation memory at which the highest correlation value is stored; and means for positioning the recording paper at a position where said counter indicates δ, and resetting the counter to 0.

Claim 10

A method for controlling a reference position of a recording paper in a multiple-time recorder in which a driving mechanism drives the recording paper relative to a recording head for recording on said recording paper in a forward or backward paper-feed direction by unit incremental steps, in which a counter is provided to count the incremental steps, and in which multiple-time recordings are superimposed on a single sheet of said recording paper by aligning the relative position between said recording paper and said recording head to a predetermined reference point at each recording of the multiple-time recordings, said method comprising: an initialization step to reset said counter to 0(zero) at said reference point before commencement of a first recording; a writing step for writing n data of f(i) processed from an output of a sensor for measuring a physical property of said recording paper at counts 0, 1, 2, . . . i . . . (n-1) of said counter, where n is an arbitrary integer determinable by design and f(i) is the processed data corresponding to count i of said counter, in a reference data memory at address i before commencement of said first recording; a writing step for writing n+k+l data of g(j) processed from an output of said sensor at points from -k to n+l-1 (where k and l are respectively arbitrary integers determinable by design, j is an integer from -k to n+l-1 and g(j) is the processed data corresponding to count j of said counter), in a compared data memory at address j, after completing said first recording and before commencing second and subsequent recordings; a calculation step for calculating a cross correlation between functions f(i) and g(i+d), where f(i) is data at address i of the reference data memory, g(i+d) is data at address i+d of the compared data memory, d is an address shift which is an integer from -k to +l and storing a calculated result at address d of a correlation memory; and a correction step for finding an amount of address shift δ which gives maximum correlation, and resetting said counter to 0 at a count of δ of said counter.

Claim 11

A method for controlling a reference position of a recording paper in a multiple-time recorder in which a driving mechanism drives the recording paper relative to a recording head for recording on said recording paper in a forward or backward paper-feed direction by unit incremental steps, in which a counter is provided to count the incremental steps, and in which multiple-time recordings are superimposed on a single sheet of said recording paper by aligning the relative position between said recording paper and said recording head to a predetermined reference point at each recording of the multiple-time recordings, said method comprising: an initialization step to reset said counter to 0(zero) at said reference point before commencement of a first recording; a writing step for writing n data of f(i) processed from an output of a sensor for measuring a physical property of said recording paper at counts 0, 1, 2, . . . i . . . (n-1) of said counter, where n is an arbitrary integer determinable by design and f(i) is the processed data corresponding to count i of said counter, in a reference data memory at address i before commencement of said first recording; a writing step for writing n+k+l data of g(j) processed from an output of said sensor at points from -k to n+l-1 (where k and l are respectively arbitrary integers determinable by design, j is an integer from -k to n+l-1 and g(j) is the processed data corresponding to count j of said counter), in a compared data memory at address j, after completing said first recording and before commencing second and subsequent recordings; a calculation step for calculating a cross correlation between functions f(i) and g(i+d), where f(i) is data at address i of the reference data memory, g(i+d) is data at address i+d of the compared data memory, d is an address shift which is an integer from -k to +l and storing a calculated result at address d of a correlation memory; and a correction step for finding an amount of address shift δ which gives maximum correlation, and resetting said counter to 0 at a count of δ of said counter.

Claim 12

An apparatus for controlling a reference position of a recording paper in a multiple-time recorder in which there are provided driving means for changing a relative position between the recording paper and a recording head forward or backward in a recording direction by a desired amount of displacement for recording on the recording paper, supervisory means for supervising said relative position in said recording direction, data storage means for storing data of a reference position between the recording paper and the recording head, wherein multiple-time recordings are superimposed on a single sheet of the recording paper by aligning, at each recording of the multiple-time recordings, the relative position between the recording paper and the recording head according to the data of the reference position stored in said data storage means, characterized in that said apparatus comprises: measuring means fixed to a point of said apparatus for measuring a physical property of the recording paper as a function of the relative position, said relative position being changed by said driving means supervised by said supervisory means; pattern obtaining means for obtaining a variation pattern of said physical property from an output of said measuring means when said driving means is changing said relative position between the recording paper and the recording head in a predetermined range including said reference position; antecedent pattern obtaining means for operating said pattern obtaining means prior to each recording of the multiple-time recordings; correlation means for detecting a maximum correlation point between a compared pattern and a reference pattern at a current recording of each second and subsequent recordings of multiple-time recordings, said compared pattern being the variation pattern obtained by said antecedent pattern obtaining means for said current recording, and said reference pattern being a variation pattern obtained by said antecedent pattern obtaining means for a recording preceding said current recording; and reference position control means for storing new data of the reference position deduced from said maximum correlation point in said storage means as the data of the reference position.

Claim 13

An apparatus for controlling a reference position of a recording paper in a multiple-time recorder in which there are provided driving means for changing a relative position between the recording paper and a recording head forward or backward in a recording direction by a desired amount of displacement for recording on the recording paper, supervisory means for supervising said relative position in said recording direction, data storage means for storing data of a reference position between the recording paper and the recording head, wherein multiple-time recordings are superimposed on a single sheet of the recording paper by aligning, at each recording of the multiple-time recordings, the relative position between the recording paper and the recording head according to the data of the reference position stored in said data storage means, characterized in that said apparatus comprises: measuring means fixed to a point of said apparatus for measuring a physical property of the recording paper as a function of the relative position, said relative position being changed by said driving means supervised by said supervisory means; pattern obtaining means for obtaining a variation pattern of said physical property from an output of said measuring means when said driving means is changing said relative position between the recording paper and the recording head in a predetermined range including said reference position; antecedent pattern obtaining means for operating said pattern obtaining means prior to each recording of the multiple-time recordings; correlation means for detecting a maximum correlation point between a compared pattern and a reference pattern at a current recording of each second and subsequent recordings of multiple-time recordings, said compared pattern being the variation pattern obtained by said antecedent pattern obtaining means for said current recording, and said reference pattern being a variation pattern obtained by said antecedent pattern obtaining means for a recording preceding said current recording; and reference position control means for storing new data of the reference position deduced from said maximum correlation point in said storage means as the data of the reference position.

Claim 15

An apparatus for controlling a reference position of a recording paper in a multiple-time recorder in which there are provided driving means for displacing the recording paper forward or backward in a paper-feed direction to change a relative position in said paper-feed direction between the recording paper and a recording head by a desired amount of displacement for recording on the recording paper, supervisory means for supervising said relative position in said paper-feed direction between the recording paper and the recording head, data storage means for storing data of the reference position between the recording paper and the recording head, wherein multiple-time recordings are superimposed on a single sheet of the recording paper by aligning, at each recording of the multiple-time recordings, the relative position between the recording paper and the recording head according to the data of the reference position stored in said data storage means, characterized in that said apparatus comprises: measuring means fixed to a point of the recording head for measuring a physical property of the recording paper as a function of the relative position, said relative position being changed by said driving means supervised by said supervisory means; pattern obtaining means for obtaining a variation pattern of said physical property from an output of said measuring means when said driving means is changing said relative position between the recording paper and the recording head in a predetermined range including said reference position; antecedent pattern obtaining means for operating said pattern obtaining means prior to each recording of the multiple-time recordings; correlation means for detecting a maximum correlation point between a compared pattern and a reference pattern at a current recording of each second and subsequent recordings of multiple-time recording, said compared pattern being the variation pattern obtained by said antecedent pattern obtaining means for said current recording, and said reference pattern being a variation pattern obtained by said antecedent pattern obtained by said antecedent pattern obtaining means for a recording preceding said current recording; and reference position control means for storing new data of the reference position deduced from said maximum correlation point in said storage means as the data of the reference position.

Claim 16

An apparatus for controlling a reference position of a recording paper in a multiple-time recorder in which there are provided driving means for displacing the recording paper forward or backward in a paper-feed direction to change a relative position in said paper-feed direction between the recording paper and a recording head by a desired amount of displacement for recording on the recording paper, supervisory means for supervising said relative position in said paper-feed direction between the recording paper and the recording head, data storage means for storing data of the reference position between the recording paper and the recording head, wherein multiple-time recordings are superimposed on a single sheet of the recording paper by aligning, at each recording of the multiple-time recordings, the relative position between the recording paper and the recording head according to the data of the reference position stored in said data storage means, characterized in that said apparatus comprises: measuring means fixed to a point of the recording head for measuring a physical property of the recording paper as a function of the relative position, said relative position being changed by said driving means supervised by said supervisory means; pattern obtaining means for obtaining a variation pattern of said physical property from an output of said measuring means when said driving means is changing said relative position between the recording paper and the recording head in a predetermined range including said reference position; antecedent pattern obtaining means for operating said pattern obtaining means prior to each recording of the multiple-time recordings; correlation means for detecting a maximum correlation point between a compared pattern and a reference pattern at a current recording of each second and subsequent recordings of multiple-time recording, said compared pattern being the variation pattern obtained by said antecedent pattern obtaining means for said current recording, and said reference pattern being a variation pattern obtained by said antecedent pattern obtained by said antecedent pattern obtaining means for a recording preceding said current recording; and reference position control means for storing new data of the reference position deduced from said maximum correlation point in said storage means as the data of the reference position.