GB2096360A - A method and a device for adjusting an image-reproducing apparatus - Google Patents

A method and a device for adjusting an image-reproducing apparatus Download PDF

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Publication number
GB2096360A
GB2096360A GB8208112A GB8208112A GB2096360A GB 2096360 A GB2096360 A GB 2096360A GB 8208112 A GB8208112 A GB 8208112A GB 8208112 A GB8208112 A GB 8208112A GB 2096360 A GB2096360 A GB 2096360A
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GB
United Kingdom
Prior art keywords
displacement
plane
motors
pulse width
planes
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.)
Granted
Application number
GB8208112A
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GB2096360B (en
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Eskofot AS
Original Assignee
Eskofot AS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Eskofot AS filed Critical Eskofot AS
Publication of GB2096360A publication Critical patent/GB2096360A/en
Application granted granted Critical
Publication of GB2096360B publication Critical patent/GB2096360B/en
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/34—Means for automatic focusing therefor
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
    • G05B19/19—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path
    • G05B19/39—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path using a combination of the means covered by at least two of the preceding groups G05B19/21, G05B19/27 and G05B19/33
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
    • H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
    • H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
    • H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
    • H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
    • H02P7/29—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using pulse modulation
    • H02P7/291—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using pulse modulation with on-off control between two set points, e.g. controlling by hysteresis

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • Manufacturing & Machinery (AREA)
  • Automation & Control Theory (AREA)
  • Power Engineering (AREA)
  • Control Of Stepping Motors (AREA)
  • Variable Magnification In Projection-Type Copying Machines (AREA)
  • Control Of Multiple Motors (AREA)
  • Control Of Position Or Direction (AREA)
  • Detergent Compositions (AREA)

Abstract

A method and a device for adjusting an original plane (8), an objective plane (6), and an image plane (4) in an image-reproducing apparatus by means of one or more D.C. motors with a great torque. The motors are controlled by means of voltage pulses each motor (1) being braked after each pulse supply. The planes are adjusted to approximately the desired magnifying percentage by known means. Final adjustment is determined by giving one of the motors a pulse and sensing the displacement of its associated plane. From this the pulse width of a given number of pulses or the number of given pulses is determined which will result in the final positioning of the said plane. <IMAGE>

Description

SPECIFICATION A method and a device for adjusting an imagereproducing apparatus The invention relates to a method of adjusting an original plane, an objective plane, and an image plane in an image-reproducing apparatus by means of one or more driving motors in the form of D.C. motors with a great torque, said motors being controlled by means of voltage pulses and each motor being braked after each pulse supply, a computer controlling the pulse supply and a code disc measuring the displacement of at least one of the planes.
Such a method is known from DE-OS 2950933. This known method renders it possible to obtain an accurate adjustment within predetermined intervals. The method according to the invention is characterised by calculating the displacement at the initial pulse width by means of the computer and the code disc and regulating the pulse width in accordance therewith in order to obtain a predetermined displacement.
In this manner the planes are adjustable with great accuracy also at extreme loads.
The invention also relates to a device for adjusting an original plane, an objective plane, and an image plane in an image-reproducing apparatus by means of one or more driving motors in the form of D.C. motors with a great torque, said motors being controlled by means of voltage pulses and each motor being braked after each pulse supply, said device comprising a computer and a code disc measuring the displacement of at least one of the planes. The device is characterised by the computer being adapted to calculate the displacement at the initial pulse width and to regulate the pulse width in accordance therewith in order to obtain a predetermined displacement. As a result, a particularly advantageous device for adjusting the image-reproducing apparatus is obtained.
The invention will be described below with reference to the accompanying drawing, in which: Fig. 1 illustrates an image-reproducing apparatus in the form of a camera, Fig. 2 is a rear view of part of the camera and illustrating a code disc and a photocell arrangement, and Fig. 3 is a rear view of the camera with motor chain drives and code discs.
The reproduction camera illustrated in Fig. 1 comprises an original plane 1, an objective plane 6, and an image plane 4. The planes are adjusted relative to each other by means of a number of D.C.
motors 1 with great torque, cf. Fig. 3, said motors through chain drives controlling the up and downward movement of the planes. The adjustment is automatically and quickly performed, and the final position is accurate. The adjustment is performed by adjusting to the desired magnifying percentage, said magnifying percentage determining the final position of the planes. At a relatively great velocity a motor 1 subsequently situates the plane in question, e.g.
the objective plane 6, in a conventional manner adjacent the desired final position. The final adjustment is then performed by supplying a plurality of pulses, e.g. about 50 pulses. After each pulse supply, a quick braking takes place in order to prevent last runnings. In this manner a controlled position adjustment is obtained, which is very accurate. As a bellow 7 during the adjustment of the objective plane plane 6 is more and more compressed, the torque of the motor increases, for which reason the pulse width must be increased correspondingly.
This is according to the invention obtained by means of a computer 2 and a code disc in the form of an encoder 21 with photocells measuring the displacement of one of the planes. The computer and the code disc arrangement 20, 21 calculate the displacement of the plane at the initial pulse width and regulate said pulse width in response to the calculated displacement in order to obtain the desired displacement during said predetermined number of pulses, said displacement being proportional to the pulse width. As a result, the regulation is almost completely independent of the load, such as the load deriving from the compression of the bellow 7.
The adjustment into a position adjacent the final position is performed by means of a computer in a manner known per se.
Thus it is illustrated how to adjust the planes in the shortest possible time irrespective of the load.
According to an alternative embodiment, the number of pulses is instead regulated. Such a regulation, however, requires much more time.
Claims
1. A method of adjusting an original plane, an objective plane, and an image plane in an imagereproducing apparatus by means of one or more driving motors in the form of D.C. motors with a great torque, said motors being controlled by means of voltage pulses and each motor being braked after each pulse supply, a computer controlling the pulse supply and a code disc measuring the displacement of at least one of the planes, characterised by calculating the displacement at the initial pulse width by means of the computer and the code disc and regulating the pulse width in accordance therewith in order to obtain a predetermined displacement.
2. A device for adjusting an original plane, an objective plane, and an image plane in an imagereproducing apparatus by means of one or more driving motors in the form of D.C. motors with a great torque, said motors being controlled by means of voltage pulses and each motor being braked after each pulse supply, said device comprising a computer and a code disc measuring the displacement of at least one of the planes, characterised by the computer being adapted to calculate the displacement at the initial pulse width and to regulate the pulse width
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A method and a device for adjusting an imagereproducing apparatus The invention relates to a method of adjusting an original plane, an objective plane, and an image plane in an image-reproducing apparatus by means of one or more driving motors in the form of D.C. motors with a great torque, said motors being controlled by means of voltage pulses and each motor being braked after each pulse supply, a computer controlling the pulse supply and a code disc measuring the displacement of at least one of the planes. Such a method is known from DE-OS 2950933. This known method renders it possible to obtain an accurate adjustment within predetermined intervals. The method according to the invention is characterised by calculating the displacement at the initial pulse width by means of the computer and the code disc and regulating the pulse width in accordance therewith in order to obtain a predetermined displacement. In this manner the planes are adjustable with great accuracy also at extreme loads. The invention also relates to a device for adjusting an original plane, an objective plane, and an image plane in an image-reproducing apparatus by means of one or more driving motors in the form of D.C. motors with a great torque, said motors being controlled by means of voltage pulses and each motor being braked after each pulse supply, said device comprising a computer and a code disc measuring the displacement of at least one of the planes. The device is characterised by the computer being adapted to calculate the displacement at the initial pulse width and to regulate the pulse width in accordance therewith in order to obtain a predetermined displacement. As a result, a particularly advantageous device for adjusting the image-reproducing apparatus is obtained. The invention will be described below with reference to the accompanying drawing, in which: Fig. 1 illustrates an image-reproducing apparatus in the form of a camera, Fig. 2 is a rear view of part of the camera and illustrating a code disc and a photocell arrangement, and Fig. 3 is a rear view of the camera with motor chain drives and code discs. The reproduction camera illustrated in Fig. 1 comprises an original plane 1, an objective plane 6, and an image plane 4. The planes are adjusted relative to each other by means of a number of D.C. motors 1 with great torque, cf. Fig. 3, said motors through chain drives controlling the up and downward movement of the planes. The adjustment is automatically and quickly performed, and the final position is accurate. The adjustment is performed by adjusting to the desired magnifying percentage, said magnifying percentage determining the final position of the planes. At a relatively great velocity a motor 1 subsequently situates the plane in question, e.g. the objective plane 6, in a conventional manner adjacent the desired final position. The final adjustment is then performed by supplying a plurality of pulses, e.g. about 50 pulses. After each pulse supply, a quick braking takes place in order to prevent last runnings. In this manner a controlled position adjustment is obtained, which is very accurate. As a bellow 7 during the adjustment of the objective plane plane 6 is more and more compressed, the torque of the motor increases, for which reason the pulse width must be increased correspondingly. This is according to the invention obtained by means of a computer 2 and a code disc in the form of an encoder 21 with photocells measuring the displacement of one of the planes. The computer and the code disc arrangement 20, 21 calculate the displacement of the plane at the initial pulse width and regulate said pulse width in response to the calculated displacement in order to obtain the desired displacement during said predetermined number of pulses, said displacement being proportional to the pulse width. As a result, the regulation is almost completely independent of the load, such as the load deriving from the compression of the bellow 7. The adjustment into a position adjacent the final position is performed by means of a computer in a manner known per se. Thus it is illustrated how to adjust the planes in the shortest possible time irrespective of the load. According to an alternative embodiment, the number of pulses is instead regulated. Such a regulation, however, requires much more time. Claims
1. A method of adjusting an original plane, an objective plane, and an image plane in an imagereproducing apparatus by means of one or more driving motors in the form of D.C. motors with a great torque, said motors being controlled by means of voltage pulses and each motor being braked after each pulse supply, a computer controlling the pulse supply and a code disc measuring the displacement of at least one of the planes, characterised by calculating the displacement at the initial pulse width by means of the computer and the code disc and regulating the pulse width in accordance therewith in order to obtain a predetermined displacement.
2. A device for adjusting an original plane, an objective plane, and an image plane in an imagereproducing apparatus by means of one or more driving motors in the form of D.C. motors with a great torque, said motors being controlled by means of voltage pulses and each motor being braked after each pulse supply, said device comprising a computer and a code disc measuring the displacement of at least one of the planes, characterised by the computer being adapted to calculate the displacement at the initial pulse width and to regulate the pulse width in accordance therewith in order to obtain a predetermined displacement.
3. A method substantially as described above with reference to the accompanying drawing.
4. A device substantially as described above with reference to the accompanying drawing.
5. An image-reproducing apparatus such as a reproduction camera substantially as described above with reference to the accompanying drawing.
GB8208112A 1981-03-31 1982-03-19 A method and a device for adjusting an image-reproducing apparatus Expired GB2096360B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK146281A DK161220C (en) 1981-03-31 1981-03-31 PROCEDURE FOR SETTING UP AN IMAGING DEVICE

Publications (2)

Publication Number Publication Date
GB2096360A true GB2096360A (en) 1982-10-13
GB2096360B GB2096360B (en) 1985-05-30

Family

ID=8105094

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8208112A Expired GB2096360B (en) 1981-03-31 1982-03-19 A method and a device for adjusting an image-reproducing apparatus

Country Status (5)

Country Link
JP (2) JPS581137A (en)
DE (1) DE3211050A1 (en)
DK (1) DK161220C (en)
GB (1) GB2096360B (en)
NL (1) NL8201203A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4530592A (en) * 1983-03-21 1985-07-23 Xerox Corporation Registration mechanism for a multimagnification reproduction apparatus
US4537499A (en) * 1983-03-21 1985-08-27 Xerox Corporation Imaging system for producing reduced or enlarged images of an original document

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2225416A1 (en) * 1972-05-25 1973-12-06 Boeger Duplomat Apparate Kg Dr PROCEDURE FOR SETTING UP A REPRO CAMERA
JPS5394981A (en) * 1977-01-28 1978-08-19 Seiko Epson Corp Electronic wristwatch
DK149352C (en) * 1979-01-11 1986-11-03 Eskofot As PROCEDURE FOR SETTING A MAGAZINE
JPS55140909A (en) * 1979-04-20 1980-11-04 Hitachi Koki Co Ltd Servomotor control unit

Also Published As

Publication number Publication date
JPH0489947U (en) 1992-08-05
DE3211050A1 (en) 1982-10-07
DK161220C (en) 1991-11-25
JPS581137A (en) 1983-01-06
DK161220B (en) 1991-06-10
NL8201203A (en) 1982-10-18
DK146281A (en) 1982-10-01
GB2096360B (en) 1985-05-30

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PCNP Patent ceased through non-payment of renewal fee