CA1169957A - Arrangement for scanning originals provided with graphic patterns - Google Patents
Arrangement for scanning originals provided with graphic patternsInfo
- Publication number
- CA1169957A CA1169957A CA000375281A CA375281A CA1169957A CA 1169957 A CA1169957 A CA 1169957A CA 000375281 A CA000375281 A CA 000375281A CA 375281 A CA375281 A CA 375281A CA 1169957 A CA1169957 A CA 1169957A
- Authority
- CA
- Canada
- Prior art keywords
- carriage
- arrangement
- scanning
- scanner
- synchronising
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000005693 optoelectronics Effects 0.000 claims abstract description 10
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/12—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using the sheet-feed movement or the medium-advance or the drum-rotation movement as the slow scanning component, e.g. arrangements for the main-scanning
- H04N1/126—Arrangements for the main scanning
- H04N1/128—Arrangements for the main scanning using a scanning head arranged for linear reciprocating motion
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/047—Detection, control or error compensation of scanning velocity or position
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/10—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using flat picture-bearing surfaces
- H04N1/1013—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using flat picture-bearing surfaces with sub-scanning by translatory movement of at least a part of the main-scanning components
- H04N1/1017—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using flat picture-bearing surfaces with sub-scanning by translatory movement of at least a part of the main-scanning components the main-scanning components remaining positionally invariant with respect to one another in the sub-scanning direction
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/12—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using the sheet-feed movement or the medium-advance or the drum-rotation movement as the slow scanning component, e.g. arrangements for the main-scanning
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
- H04N2201/04—Scanning arrangements
- H04N2201/0402—Arrangements not specific to a particular one of the scanning methods covered by groups H04N1/04 - H04N1/207
- H04N2201/0422—Media holders, covers, supports, backgrounds; Arrangements to facilitate placing of the medium
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
- H04N2201/04—Scanning arrangements
- H04N2201/0402—Arrangements not specific to a particular one of the scanning methods covered by groups H04N1/04 - H04N1/207
- H04N2201/0436—Scanning a picture-bearing surface lying face up on a support
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
- H04N2201/04—Scanning arrangements
- H04N2201/047—Detection, control or error compensation of scanning velocity or position
- H04N2201/04701—Detection of scanning velocity or position
- H04N2201/0471—Detection of scanning velocity or position using dedicated detectors
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
- H04N2201/04—Scanning arrangements
- H04N2201/047—Detection, control or error compensation of scanning velocity or position
- H04N2201/04701—Detection of scanning velocity or position
- H04N2201/04715—Detection of scanning velocity or position by detecting marks or the like, e.g. slits
- H04N2201/04727—Detection of scanning velocity or position by detecting marks or the like, e.g. slits on a linear encoder
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
- H04N2201/04—Scanning arrangements
- H04N2201/047—Detection, control or error compensation of scanning velocity or position
- H04N2201/04701—Detection of scanning velocity or position
- H04N2201/04729—Detection of scanning velocity or position in the main-scan direction
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
- H04N2201/04—Scanning arrangements
- H04N2201/047—Detection, control or error compensation of scanning velocity or position
- H04N2201/04701—Detection of scanning velocity or position
- H04N2201/04731—Detection of scanning velocity or position in the sub-scan direction
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
- H04N2201/04—Scanning arrangements
- H04N2201/047—Detection, control or error compensation of scanning velocity or position
- H04N2201/04701—Detection of scanning velocity or position
- H04N2201/04734—Detecting at frequent intervals, e.g. once per line for sub-scan control
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
"AN ARRANGEMENT FOR SCANNING ORIGINALS PROVIDED
WITH GRAPHIC PATTERNS"
An arrangement is disclosed for scanning an original provided with a graphic pattern along a plurality of scanning lines using an opto-electronic scanning device carried by a carriage which can be moved over the original along the scanning lines, in which lack of correlation between the position of the carriage and that of image points on the scanning lines due to slipping or elasticity of the carriage drive means is overcome. This is effected by providing the carriage with a first scanner (preferably opto-electronic) arranged to scan marks on a synchronising scale when the carriage is moved along a scanning line, the signals from the scanner being arranged to control a drive motor for the carriage.
Similarly, a second scanner is arranged on a carriage guide on which the carriage runs and which is itself movable in a direction normal to the scanning lines so as to scan marks on a second synchronising scale, the signals from this scanner serving to control a motor for the stepwise driving of the carriage guide.
"AN ARRANGEMENT FOR SCANNING ORIGINALS PROVIDED
WITH GRAPHIC PATTERNS"
An arrangement is disclosed for scanning an original provided with a graphic pattern along a plurality of scanning lines using an opto-electronic scanning device carried by a carriage which can be moved over the original along the scanning lines, in which lack of correlation between the position of the carriage and that of image points on the scanning lines due to slipping or elasticity of the carriage drive means is overcome. This is effected by providing the carriage with a first scanner (preferably opto-electronic) arranged to scan marks on a synchronising scale when the carriage is moved along a scanning line, the signals from the scanner being arranged to control a drive motor for the carriage.
Similarly, a second scanner is arranged on a carriage guide on which the carriage runs and which is itself movable in a direction normal to the scanning lines so as to scan marks on a second synchronising scale, the signals from this scanner serving to control a motor for the stepwise driving of the carriage guide.
Description
The present inVentiQn relates to an arrangement for scanning an original provided with a graphic pattern along a plurality of parallel scanning lines using an opto-electronic scanning device which is mounted on a carriage which can be moved over the original along the scanning lines.
German Patent Specification No. 25 18 370 discloses an arrangement of this kind in which an opto-electronic scanning device is passed over an original along scanning lines. In this known arrangement, the original itself is moved at right angles t~ the scanning lines by means of rollers.
It would be possible to move the carriage along the scannlng lines using a stepplng motor. With such an arrangement~
signals assigned to the positions of specific points on the scannlng~lines could be derived from the drive signals for the ste~pp~lng~ m~otor. Since the scannlng device and the associated carrlage are relatively large ln size, stepping motors are ne~eded~ which~;necessitate the use of large currents. It~would a~ls~o be~ possi;ble~to move~the carriage on which the scanning vlce~ s~mounted~by~means~of~a d.c. motor. In thls case, in ~order ;to pro~duce signàls assigned to the positions of speclflc points along the scanning line, the d.c. motor could~be~p~rovided with a; synch~ronlsing disc havlng locating marks~the~re~on~an~d these locating mar~s could be scanned by a scanne~r.~ If the~carriage~is moved b~ the d.c. motor via a , .
.
pulling means, for example, a toothed belt or a cable, the danger exists that, as a result of elasticity or tolerances, an unambiguous correlation between the specific image points along the scanning lines and the position of the carriage can no longer be guaranteed.
If, as in the case of the arrangement disclosed in the (`J German Patent Specification No. 25 18 370, the original is moved at right angles to the scanning lines by means of rollers, there is likewise a danger that as a result of slippage, an unambiguous correlation between the image points and the position of the original in the direction at right angles to the scanning lines can no longer be guaranteed.
It is accordingly an object of the invention to provide an arrangement for scanning originals provided with graphic pattérns, in which the positions of the image points can be determined with a high degree of accuracy.
I
In accordance with the invention, there is provided an arrangement for scanning an original provided with a graphic pattern along a plur~a]ity of paralleI scanning lines comprising an~opto-electron1c scanning device mounted on a carriagej means for moving said carriage over an original secured to a b~ase~ along said scanning lines, a carriage guide on which s;aid~car~riage is mounted and which is displaceable in a ; d1rect1on at right ang1es to sa1d scanning lines, means for displacing said carriage guide in said direction, a first scanner mounted on~said carriage and arranged to scan locating ~,. - :
.
.
~ 3'~
marks on a first synchronising scale arranged on said carriage guide9 a second scanner mounted on said carriage guide and arranged to scan locating marks on a second synchronising scale which is permanently attached to said base, said scanners being adapted to produce signals from the locating marks on said scales.
( \ The arrangement of the invention has the advantage that as a result of the use of the synchronising scales, regardless of the tolerances and elasticity of the drive means, an unambiguous correlation between the image points of the original which is to be scanned and the signals produced always occurs.
In the arrangement of the invention, the original is not moved but is held securely during the scanning procedure, for example, by means of partial vacuum.
An extremely rapid movement of the carriage with, neverthe-les~s,~ an unambiguous correlation of the image points along the scanning lines with the~ position of the carriage can be achieved f~the~carriage is;moved continuously by means of a first d.c.~ motor and the signals produced by the first scanner serve to establlsh the correlation between the posltion o~f~the carriage a~nd the~original, along the scanning lines. `-A r~apid scan~nlng of the original can also be achieved if~the~carriag~e guide ia~moved by means of a second d.c.
mOtQr and the signals produced by the second scanner serve to regulate the second d.c. motor to the scanning lines dàntlfl~ad by tha~locating marks on tha aecond tlming scale.
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It is particularly advantageous if the d.c. motors are in the form of non-commutator d c. servo-motors.
If it is required to scan different scanning patterns, it is expedient for the synchronising scales to be replaceable.
The scanning can be effected in a simple manner if the scanners used are in the form of opto-electronic scanners.
With regard to control of the d c. motors, it may be advantageous for the synchronising scales to be provided with additional marks which, when scanned by the scanners, cause the d.c. motors to decelerate and/or to reverse their direction of rotation.
If originals are involved of different size and with the graphic patterns which are to be scanned in different positions, it is advantageous if the originals are positioned with respect to the synchronising scales by means of at least one adjustable stop means The lnvention will now be ~urther described with reference to the drawing, which is a schematic plan view of an arrangement according to the invention.
In the~arrangement illustrated in the dravuing an original V 1S positloned~o~n a base plate G using a stop means AN which can be ~formed in one piece. The original V is held in position on the base plate G, for example, by the use of a partial vacuum. An opto-electronic scanning device AB for scanning graphic patterns present on the original V is mounted ;on ~a carrlage W. The scann1ng device AB may be adapted to scan :
, ' ' `
a sinyle colour or for multi-colour scanning. The graphic patterns are displayed within a drawing area ZF which may hav~ a line pattern and the periphery of which is shown in broken lines.
The carriage W is arranged to be displaceable in the horizontal direction on a carriage guide. The carriage guide (? comprises two parallel guide rails Fl and two lateral members Sl and S2 between which the guide rails Fl extend. The graphic pattern is scanned along scan lines AL by moving the carriage W
along the guide rails Fl by a pulling means ZMl, for example, a cable. The pulling means ZMl is itself moved by a d.c~
motor, for example a non-commutator d.c. servo-motor with a tacho-generator. The d.c. motor may, for example, be arranged beneath the lateral member Sl, but, for reasons of clarity, is not shown ln the drawlng.
; Since the original V cannot be displaced on the base plate G, after each scanning of a scanning line AL the carriage W must be moved at right angles to the scanning line to the next scanning line. For this purpose, the carriage guide itself~is arranged to be displaceable in the direct~on normal to the scanning lines along two parallel guide rails F2 located one on either side of the original V.
:
Displacement of the-c~arriage gulde is effected by means of a pulling means ZM2 which can likewise be in the form of a ~cable. The pulling means ZM2 is also driven by a d.c. motor, . .
:
. .
::
' for example a non-commutator d.c. servo-motor. Whereas the carriage W can be continuously moved by its d.c. motor, the carriage guide is moved stepwise from one scanning line to the next.
In order to achieve an accurate correlation between scanned image points on the original V and the associated positions of the opto-electronic scanning device AB, the carriage W and the lateral member Sl of the carriage guide are provided with scanners Al and A2 respectively, which preferably are in the form of opto-electronic scanners. The scanners Al and A2 scan locating marks SM on two synchronising scales TLl and TL2 respecti~ely. The synchronising scale TLl is arranged on the carriage guide parallel to the guide rails Fl, whilst the synchronising scale TL2 is fixed to the base plate G parallel to the guide rail F2 on which the lateral member Sl runs.
i~ ; When the carriageis moved in the horizontal direction of~t~he drawing along a scanning line AL, each time a locating mark~on the scale TLl is scannedS the scanner Al produces a signal which identifies the position of the carriage and t~hus ~correlates it with the image point of the original which is being scanned at that moment. This signal is fed to an analysis~clrcuit~which has not been shownO These signals can be use~d for synchronisingthe scanning signals emitted from the scanning device AB. Similarly, on movement of the carriage guide, the scanner A2 scans the locating marks SM
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on the syn~hronising scale TL2 so as to control the movement of the carriage guide along the guide rails F2. In this case, the scanning device A2 can form that part of a control circuit which controls the movement of the carriage guide to a position determined by the locating mark.
If the original i5 to be scanned in a predetermined pattern, this pattern isbrought into conformity with the locating marks on the synchronising scales TLl and TL2.
This can be effected, on the one hand, by adjustment of the stop means AN if this is designed to be adjustable with respect to the synchronising scales. On the other hand, the synchronising scales TLl and TL2 can alternatively be arranged to be adjustable-with respect to the stop means AN.
In order that originals carrying different patterns can be scanned, it is advantageous for the synchronising scales TLl and TL2 to be arranged to be replaceable. In the event - :
of a change in the pattern to be scanned, it is then only ~; necessary to provide the appropriate synchronising scales ~TLl and T L 2 .
;For the control of the d.c. motors, additional marks Ml,~M2, M3 and M4 can additionally be arranged on the synchronislng scales TLl and TL2 which marks, whsn scanned, cause the d.c. notors to decelerate or to reverse their d1rectlon of rotationO
~.
.~ ".,~, :: ~ : ~ :
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,': :~
German Patent Specification No. 25 18 370 discloses an arrangement of this kind in which an opto-electronic scanning device is passed over an original along scanning lines. In this known arrangement, the original itself is moved at right angles t~ the scanning lines by means of rollers.
It would be possible to move the carriage along the scannlng lines using a stepplng motor. With such an arrangement~
signals assigned to the positions of specific points on the scannlng~lines could be derived from the drive signals for the ste~pp~lng~ m~otor. Since the scannlng device and the associated carrlage are relatively large ln size, stepping motors are ne~eded~ which~;necessitate the use of large currents. It~would a~ls~o be~ possi;ble~to move~the carriage on which the scanning vlce~ s~mounted~by~means~of~a d.c. motor. In thls case, in ~order ;to pro~duce signàls assigned to the positions of speclflc points along the scanning line, the d.c. motor could~be~p~rovided with a; synch~ronlsing disc havlng locating marks~the~re~on~an~d these locating mar~s could be scanned by a scanne~r.~ If the~carriage~is moved b~ the d.c. motor via a , .
.
pulling means, for example, a toothed belt or a cable, the danger exists that, as a result of elasticity or tolerances, an unambiguous correlation between the specific image points along the scanning lines and the position of the carriage can no longer be guaranteed.
If, as in the case of the arrangement disclosed in the (`J German Patent Specification No. 25 18 370, the original is moved at right angles to the scanning lines by means of rollers, there is likewise a danger that as a result of slippage, an unambiguous correlation between the image points and the position of the original in the direction at right angles to the scanning lines can no longer be guaranteed.
It is accordingly an object of the invention to provide an arrangement for scanning originals provided with graphic pattérns, in which the positions of the image points can be determined with a high degree of accuracy.
I
In accordance with the invention, there is provided an arrangement for scanning an original provided with a graphic pattern along a plur~a]ity of paralleI scanning lines comprising an~opto-electron1c scanning device mounted on a carriagej means for moving said carriage over an original secured to a b~ase~ along said scanning lines, a carriage guide on which s;aid~car~riage is mounted and which is displaceable in a ; d1rect1on at right ang1es to sa1d scanning lines, means for displacing said carriage guide in said direction, a first scanner mounted on~said carriage and arranged to scan locating ~,. - :
.
.
~ 3'~
marks on a first synchronising scale arranged on said carriage guide9 a second scanner mounted on said carriage guide and arranged to scan locating marks on a second synchronising scale which is permanently attached to said base, said scanners being adapted to produce signals from the locating marks on said scales.
( \ The arrangement of the invention has the advantage that as a result of the use of the synchronising scales, regardless of the tolerances and elasticity of the drive means, an unambiguous correlation between the image points of the original which is to be scanned and the signals produced always occurs.
In the arrangement of the invention, the original is not moved but is held securely during the scanning procedure, for example, by means of partial vacuum.
An extremely rapid movement of the carriage with, neverthe-les~s,~ an unambiguous correlation of the image points along the scanning lines with the~ position of the carriage can be achieved f~the~carriage is;moved continuously by means of a first d.c.~ motor and the signals produced by the first scanner serve to establlsh the correlation between the posltion o~f~the carriage a~nd the~original, along the scanning lines. `-A r~apid scan~nlng of the original can also be achieved if~the~carriag~e guide ia~moved by means of a second d.c.
mOtQr and the signals produced by the second scanner serve to regulate the second d.c. motor to the scanning lines dàntlfl~ad by tha~locating marks on tha aecond tlming scale.
`
~ .
; .: : . . ' ~ , .~:
`
It is particularly advantageous if the d.c. motors are in the form of non-commutator d c. servo-motors.
If it is required to scan different scanning patterns, it is expedient for the synchronising scales to be replaceable.
The scanning can be effected in a simple manner if the scanners used are in the form of opto-electronic scanners.
With regard to control of the d c. motors, it may be advantageous for the synchronising scales to be provided with additional marks which, when scanned by the scanners, cause the d.c. motors to decelerate and/or to reverse their direction of rotation.
If originals are involved of different size and with the graphic patterns which are to be scanned in different positions, it is advantageous if the originals are positioned with respect to the synchronising scales by means of at least one adjustable stop means The lnvention will now be ~urther described with reference to the drawing, which is a schematic plan view of an arrangement according to the invention.
In the~arrangement illustrated in the dravuing an original V 1S positloned~o~n a base plate G using a stop means AN which can be ~formed in one piece. The original V is held in position on the base plate G, for example, by the use of a partial vacuum. An opto-electronic scanning device AB for scanning graphic patterns present on the original V is mounted ;on ~a carrlage W. The scann1ng device AB may be adapted to scan :
, ' ' `
a sinyle colour or for multi-colour scanning. The graphic patterns are displayed within a drawing area ZF which may hav~ a line pattern and the periphery of which is shown in broken lines.
The carriage W is arranged to be displaceable in the horizontal direction on a carriage guide. The carriage guide (? comprises two parallel guide rails Fl and two lateral members Sl and S2 between which the guide rails Fl extend. The graphic pattern is scanned along scan lines AL by moving the carriage W
along the guide rails Fl by a pulling means ZMl, for example, a cable. The pulling means ZMl is itself moved by a d.c~
motor, for example a non-commutator d.c. servo-motor with a tacho-generator. The d.c. motor may, for example, be arranged beneath the lateral member Sl, but, for reasons of clarity, is not shown ln the drawlng.
; Since the original V cannot be displaced on the base plate G, after each scanning of a scanning line AL the carriage W must be moved at right angles to the scanning line to the next scanning line. For this purpose, the carriage guide itself~is arranged to be displaceable in the direct~on normal to the scanning lines along two parallel guide rails F2 located one on either side of the original V.
:
Displacement of the-c~arriage gulde is effected by means of a pulling means ZM2 which can likewise be in the form of a ~cable. The pulling means ZM2 is also driven by a d.c. motor, . .
:
. .
::
' for example a non-commutator d.c. servo-motor. Whereas the carriage W can be continuously moved by its d.c. motor, the carriage guide is moved stepwise from one scanning line to the next.
In order to achieve an accurate correlation between scanned image points on the original V and the associated positions of the opto-electronic scanning device AB, the carriage W and the lateral member Sl of the carriage guide are provided with scanners Al and A2 respectively, which preferably are in the form of opto-electronic scanners. The scanners Al and A2 scan locating marks SM on two synchronising scales TLl and TL2 respecti~ely. The synchronising scale TLl is arranged on the carriage guide parallel to the guide rails Fl, whilst the synchronising scale TL2 is fixed to the base plate G parallel to the guide rail F2 on which the lateral member Sl runs.
i~ ; When the carriageis moved in the horizontal direction of~t~he drawing along a scanning line AL, each time a locating mark~on the scale TLl is scannedS the scanner Al produces a signal which identifies the position of the carriage and t~hus ~correlates it with the image point of the original which is being scanned at that moment. This signal is fed to an analysis~clrcuit~which has not been shownO These signals can be use~d for synchronisingthe scanning signals emitted from the scanning device AB. Similarly, on movement of the carriage guide, the scanner A2 scans the locating marks SM
~ ~.s : ~
,:
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.
on the syn~hronising scale TL2 so as to control the movement of the carriage guide along the guide rails F2. In this case, the scanning device A2 can form that part of a control circuit which controls the movement of the carriage guide to a position determined by the locating mark.
If the original i5 to be scanned in a predetermined pattern, this pattern isbrought into conformity with the locating marks on the synchronising scales TLl and TL2.
This can be effected, on the one hand, by adjustment of the stop means AN if this is designed to be adjustable with respect to the synchronising scales. On the other hand, the synchronising scales TLl and TL2 can alternatively be arranged to be adjustable-with respect to the stop means AN.
In order that originals carrying different patterns can be scanned, it is advantageous for the synchronising scales TLl and TL2 to be arranged to be replaceable. In the event - :
of a change in the pattern to be scanned, it is then only ~; necessary to provide the appropriate synchronising scales ~TLl and T L 2 .
;For the control of the d.c. motors, additional marks Ml,~M2, M3 and M4 can additionally be arranged on the synchronislng scales TLl and TL2 which marks, whsn scanned, cause the d.c. notors to decelerate or to reverse their d1rectlon of rotationO
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Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS :-
1. An arrangement for scanning an original provided with a graphic pattern, along a plurality of parallel scanning lines comprising an opto-electronic scanning device mounted on a carriage, means for moving said carriage over an original secured to a base along said scanning lines, a carriage guide on which said carriage is mounted and which is displaceable in a direction at right angles to said scanning lines, means for displacing said carriage guide in said direction, a first scanner mounted on said carriage and arranged to scan locating marks on a first synchronising scale arranged on said carriage guide, a second scanner mounted on said carriage guide and arranged to scan locating marks on a second synchronising scale which is permanently attached to said base, said scanners being adapted to produce signals from the locating marks on said scales.
2. An arrangement as claimed in Claim 1, wherein said means for moving said carriage is a first d.c. electric motor adapted to move the carriage continuously, and the signals produced by said first scanner serving to establish the correlation between the position of said carriage and said original along the scan lines.
3. An arrangement as claimed in Claim 2, wherein said means for displacing said carriage guide is a second d.c. electric motor adapted to displace said carriage guide in a stepwise manner, and the signals produced by said second scanner serve to regulate the second d.c. motor so as to locate the carriage guide with a scan line as determined by the locating marks on said second scale.
4. An arrangement as claimed in Claim 2 or Claim 3, wherein the or each said d.c. motor is a non-commutator servo-motor.
5. An arrangement as claimed in any one of Claims 1 to 3, wherein each of said synchronising scales is replaceable.
6. An arrangement as claimed in any one of Claims 1 to 3, wherein each of said scanners is an opto-electronic scanner.
7. An arrangement as claimed in Claim 2 or Claim 3, wherein said synchronising scales are provided with further marks which, when scanned by said scanners, cause said d.c.
motors to decelerate and/or to reverse their direction of rotation.
motors to decelerate and/or to reverse their direction of rotation.
8. An arrangement as claimed in any one of Claims 1 to 3, wherein at least one adjustable stop means is provided whereby an original can be brought into a required position with respect to said synchronising scales.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3014433.3 | 1980-04-15 | ||
| DE19803014433 DE3014433A1 (en) | 1980-04-15 | 1980-04-15 | ARRANGEMENT FOR SCANING TEMPLATES WITH GRAPHIC PATTERNS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1169957A true CA1169957A (en) | 1984-06-26 |
Family
ID=6100065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000375281A Expired CA1169957A (en) | 1980-04-15 | 1981-04-13 | Arrangement for scanning originals provided with graphic patterns |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0038070A3 (en) |
| CA (1) | CA1169957A (en) |
| DE (1) | DE3014433A1 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATE36764T1 (en) * | 1981-11-09 | 1988-09-15 | Cybrid Ltd | PATTERN SCANNERS. |
| DE3220016A1 (en) * | 1982-05-27 | 1983-12-01 | Dorner, Jörg, Dr.-Ing., 8000 München | DEVICE FOR PRODUCING AN OPTICAL OR ELECTRONICALLY OR MAGNETICALLY STORED IMAGE INFORMATION OF AN ESSENTIAL AREA |
| DE3377905D1 (en) * | 1982-09-30 | 1988-10-13 | Toppan Printing Co Ltd | Method and apparatus of checking an arrangement of printing pages |
| US4568985A (en) * | 1983-07-11 | 1986-02-04 | Datacopy Corporation | Electronic camera scanning mechanism |
| WO1985001629A1 (en) * | 1983-09-26 | 1985-04-11 | Image Communications, Inc. | Multi-purpose facsimile machine |
| GB8331312D0 (en) * | 1983-11-23 | 1983-12-29 | Salam H P A | Document readers |
| US5181104A (en) * | 1988-05-20 | 1993-01-19 | Canon Kabushiki Kaisha | Image processing apparatus having a reader movable to a designated position |
| DE8911380U1 (en) * | 1989-09-24 | 1990-02-01 | Europäisches Laboratorium für Molekularbiologie, 69117 Heidelberg | Image reader |
| EP0751666A3 (en) * | 1995-06-29 | 1999-06-02 | Bayer Corporation | Scanner encoder system |
| DE19543656A1 (en) * | 1995-11-23 | 1997-05-28 | Kodak Ag | Method and device for scanning a bar code |
| US5991055A (en) * | 1996-09-23 | 1999-11-23 | Hewlett-Packard Company | Underpulsed scanner with variable scan speed, P. W. M. color balance, scan modes and column reversal |
| US7477425B2 (en) * | 2002-07-19 | 2009-01-13 | Hewlett-Packard Development Company, L.P. | Biasable drive for an image scanner carriage |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3369250A (en) * | 1965-07-15 | 1968-02-13 | Thomas H. Gifft | Facsimile recording device |
| US3592963A (en) * | 1966-05-02 | 1971-07-13 | Xerox Corp | Facsimile transmitter |
| US3665102A (en) * | 1969-11-12 | 1972-05-23 | Singer Co | X-y coordinate locator |
| US3752558A (en) * | 1971-06-28 | 1973-08-14 | Decision Consultants | Document scanner |
| GB1423424A (en) * | 1973-02-13 | 1976-02-04 | Dainippon Screen Mfg | Picture scanning and recording system |
| US3886371A (en) * | 1973-12-03 | 1975-05-27 | Ball Computer Products Inc | Optical character reader scanning support mechanism |
| US3867569A (en) * | 1974-02-25 | 1975-02-18 | Bell Telephone Labor Inc | Compact flatbed page scanner |
| DE2609648A1 (en) * | 1976-03-09 | 1977-09-15 | Messerschmitt Boelkow Blohm | DEVICE FOR DIGITAL CAPTURING AND / OR STORAGE OF ANALOGUE INFORMATION, SUCH AS DOTS, LINES OR ANY OTHER GRAPHICAL IMAGES, ON A LEVEL TEMPLATE |
-
1980
- 1980-04-15 DE DE19803014433 patent/DE3014433A1/en not_active Ceased
-
1981
- 1981-04-13 CA CA000375281A patent/CA1169957A/en not_active Expired
- 1981-04-13 EP EP81102829A patent/EP0038070A3/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| EP0038070A3 (en) | 1983-09-28 |
| DE3014433A1 (en) | 1981-10-22 |
| EP0038070A2 (en) | 1981-10-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |