US3766394A - Device for the optical-electrical scanning of an information carrier - Google Patents

Device for the optical-electrical scanning of an information carrier Download PDF

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Publication number
US3766394A
US3766394A US00173374A US3766394DA US3766394A US 3766394 A US3766394 A US 3766394A US 00173374 A US00173374 A US 00173374A US 3766394D A US3766394D A US 3766394DA US 3766394 A US3766394 A US 3766394A
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United States
Prior art keywords
lamp
voltage
information carrier
switching
intensity
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 - Lifetime
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US00173374A
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English (en)
Inventor
G Gottschal
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Franz Morat GmbH
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Franz Morat GmbH
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Publication date
Priority claimed from DE19702041795 external-priority patent/DE2041795C/de
Application filed by Franz Morat GmbH filed Critical Franz Morat GmbH
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
    • H05B39/04—Controlling
    • H05B39/041—Controlling the light-intensity of the source
    • H05B39/042—Controlling the light-intensity of the source by measuring the incident light
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/66—Devices for determining or controlling patterns ; Programme-control arrangements
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10821—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices
    • G06K7/10851—Circuits for pulse shaping, amplifying, eliminating noise signals, checking the function of the sensing device
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Definitions

  • ABSTRACT A device for the optical-electrical scanning of an information carrier with a scanning device especially for use with a knitting machine having at least one lamp, at least one photoelectric cell, a transport means for establishing relative motion between the information carrier and the scanning device, including a control circuit to maintain a preselectable rated intensity in said lamp, a voltage limiting circuit for the lamp voltage, a first time member associated with said voltage limiting circuit through which the lamp voltage during the switch-on process is at first limited to a value above the preselected lamp voltage and a preselected time span after the switch on process to nominal lamp voltage and that the transport means is activated after attainment of a rated intensity.
  • This invention relates to the field of optical-electrical scanning devices for information carriers.
  • the information carriers are considerably stressed thermally by the lamps in order to achieve a high degree of scanning accuracy and speed. If the information carrier during a scanning process is step by step or continually transported through a crack or opening located between the lamps and a photoelectric cell, the heat generated by the lamp is distributed over a larger surface on the information carrier. Especially in case of slow feeding speeds or in case of protracted idleness of the information carrier i.e. when the information carrier is at a standstill for a longer period of time the information carrier may be so greatly heated up that it will be damaged or permanently deformed. This is undesirable .because the information carrier is generally intended for multiple use.
  • Heat filters which absorb a certain portion of the ultrared radiation of the lamp which is not required for scanning.
  • Heat filters entail the disadvantage that they offer either incomplete heat protection or that they require such a great increase in the lamp output, especially in connection with film strips as information carriers, that the lamps lifetime is considerably reduced.
  • Another possibility of avoiding the above-mentioned disadvantage consists in disconnecting the lamp when the information carrier is at a standstill. But this entails the disadvantage that the lamp is not immediately ready for operation again when it is turned on again because, when the nominal voltage is applied, the rated intensity is attained only in, for example, 500 milliseconds, as a function of the dimensions of the filament.
  • This disadvantage is particularly serious when the information carrier is to be used for the automatic control of a machine, for example, a knitting machine, whereby every marking of the information carrier, which is scanned produces a control signal which activates some member of the machine, for example, a needle selection device on the knitting machine.
  • the information carrier in such a case is to be adjusted step by step to a very specific marking from the standstill several times very briefly by activating a switch so that a control processassociated with it can be controlled on the machine, then a time member would have to be connected with the switch in order to set the information carrier in motion only at a delay of about 500 milliseconds.
  • An object of this invention' is to create a scanning device by means of which, on the one hand, it is possible to prevent the excessive heating of the information carrier in a simple manner and, on the other hand, which will permit the fastest possible start of the scanning of the information carrier.
  • a further object of this invention is to provide a scanning device which can be used at slow feeding speeds or when the information carrier is at a standstill for a long period of time.
  • the present invention relates to an optical-electrical scanning device. More particularly, this invention relates to an optical-electrical scanning device for use in connection with knitting machines.
  • This invention relates to a device for the opticalelectrical scanning of an information carrier with a scanning device consisting of lamp means and photoelectric cells, a feeder means to establish a relative movement between the information carrier and the scanning device, a control circuit to maintain a preselectable rated intensity of the lamps in the lamp means, and a limiting circuit for the lamp voltage.
  • a time member associated with a voltage limiting circuit and through the time member a lamp voltage is at first limited to a value essentially above the nominal voltage and to a preselected span of time after adjusting for the nominal voltage and a preselected span of time and after the switch-on process for the nominal voltage.
  • the feeder device begins to operate only after the rated intensity has been attained.
  • Switching the maximum voltage from a high value to a smaller value, which generally corresponds to the nominal voltage of the lamp, is therefore a process which is controlled by a time member which is activated by means of the switch-on process and which reliably switches prior to the moment at which the lamp would be destroyed if it were to be further overloaded.
  • the rated intensity of the lamp is maintained, during the disconnection or cutoff process up till the final termination of the scanning. If the scanning is accomplished by moving the information carrier .with're-'v lation to the scanning device then the end of the scanning is attained and not ,when the transport device of the information carrier is turned off but only when the information carrier finally comes to a standstill.
  • FIG. 1 is a schematic diagram of an optical-electrical scanning device for an information carrier suitable to control a circular knitting machine
  • FIG. 2 is a schematic diagram of a switching circuit according to the invention for the operation of the lamp and the feeder device for the information carrier of FIG. 1;
  • FIG. 3 is a schematic diagram of the time curve of the intensity, the current, and the voltage of the lamp of the scanning device.
  • FIG. 4 shows an example of the control circuit and the limiting circuits of the switching circuit of this invention.
  • FIG. 1 the needle cylinder 1 of a circular knitting machine, which can be rotated in the direction of the arrow, is illustrated schematically.
  • Cylinder needles 3 which may be moved up and down independently of each other, are arranged on needle cylinder 1.
  • control magnet systems 5 which have electrical control signals via a line 19.
  • the control signals are received through the scanning of an information carrier 7 which by means of transport rollers 9 is transported past a scanning device 11.
  • the information carrier for example, is a film strip with opaque and translucent markings.
  • the scanning device 1 1 contains at least one lamp 13 which, for example, can be an incandescent lamp, and at least one photoelectric cell (not shown).
  • the electrical signals obtained through scanning are fed to an electronic system 17 and, after amplification and standardization, are fed to a pertinent control magnet system 5.
  • a stepping motor 21 is used to drive the transport rollers 9, whereby a transmission or reduction gear 23 can be provided between the stepping motor 21 and the transport rollers 9.
  • the stepping motor is connected via lines 25, the electronic system 17, and a line 27, with a timing impulse generator 29 which when the needle cylinder is rotated generates one cycle signal per needle moving past and through this signal the information carrier 7 is transported further one step at a time.
  • lamp 13 is connected to a battery 35 via a resistance 31 and an adjusting member 33.
  • the output supplied to lamp 13 can be adjusted to any desired value.
  • a photoelectric sensor 37 is used to determine the actual intensity of lamp 37 and gives an electrical signal which is proportional to the intensity which is supplied in an amplified manner to an amplifier 39 and which is then supplied to a comparison circuit 41.
  • the comparison circuit the electrical signal is compared with a signal which is proportional to a preselected rated intensity and which is supplied via a line 43. The difference between the signals that are proportional to the actual intensity and the rated intensity is fed into a con!
  • trol circuit 45 which gives off a difference signal which is proportional to this difference and which is amplified and then fed to an adjusting member 33. As a function of the size of the difference signal, the adjusting member 33 is then adjusted in the correct direction until the difference signal disappears or until lamp 13 has attained the desired rated intensity.
  • a limiting circuit 47 To limit the lamp current, there may be used a limiting circuit 47.
  • the current which flows through lamp 13 is measured on a resistance 31.
  • the measurement signal is supplied to the limiting circuit 47 via a line 48.
  • a signal is supplied to another input of the limiting circuit 47 via a line 49 and this signal represents a maximum permissible lamp current 1 As long as the actual value of the lamp current is below the value I the limiting circuit 47 have no influence on the remaining circuit arrangement.
  • the limiting circuit 47 gives off a signal which activates a switching member located in the control circuit 45 in such a manner that the difference signal given off by the control circuit 45 will remain limited to the value which just happens to be present at the moment.
  • the adjusting member 33 remains in its momentary position and the lamp current constantly retains the value l even if the rated intensity of the lamp has not yet been attained.
  • the voltage applied to lamp 13 is limited by a limiting circuit 50.
  • the limiting circuit 50 is supplied on the one hand, via a line 51, with the signals proportional to the actual voltage and, on the other hand, via a line 52, with signals which are in a relationship with a preselected maximum lamp voltage U
  • the limiting circuit 50 gives off a signal which is supplied to the control circuit 45 and which causes the difference signal, appearing at the output of the control circuit 45, to remain constant, regardless of the actual intensity of the lamp which just happens to be there at that time, so long as the actual voltage of lamp 13 is greater than nwr-
  • the maximum lamp voltage U can be selected differently.
  • a turn-on and tum-off switch 53 which is connected with a switch 55 by means of a time member 54.
  • the switch S5 is connected, on the one hand, to the line 52 and, on the other hand, to a point 59.
  • the line 52 is furthermore connected with a point 61.
  • Point 59 is on a relatively high potential U whereas point 61 is on a relatively low potential U for example, the nominal voltage.
  • Time member 54 is so designed that the switch 55 is likewise closed when the turn-on and the turn-off switch 53 is closed but it is opened again after a certain time delay.
  • the line 52 immediately after the turn-on process, is at first at a relatively high and then at a relatively low potential.
  • a switching member 63 through which a motor 65 is turned on at the moment of switchon and this motor brings about rotation of the needle cylinder 1 of a circular knitting machine and thus a rotation of the transport rollers 9 of the information carrier 7.
  • switch 57 may be further connected between line 52 and point 61 another switch 57 upon which acts a second time member 67.
  • the combination from switch 57 and time member 67 have the effect that the line 52 remains connected with point 61 for a preselected period of time when the turn-on and turn-off switch 53 is opened.
  • Time member 67 however does not prevent the immediate closing of switch 57 during the switch-on process.
  • Line 52 connected with switches 55 and 57, is also directed with a point 69 which is on a lower potential U when compared to points 59 and 61.
  • the device operates in the following manner:
  • the maximum voltage U which is adjusted prior to the moment t can be about 30 percent of the nominal voltage or less. It makes certain that the information carrier will not be damaged with the pertinent intensity of filament temperature of the lamp 13 even in case of longer standstill.
  • point 61 is normally put on a potential U corresponding to the nominal voltage of the lamp, whereas time t is so selected that the lamp 13 at time i, cannot yet be destroyed with certainty if during the time interval t to t it is supplied with an output computed from the possible maximum values U and 1
  • the switching member 63 which is activated by switching on the turn-on and the turn-off switch 51 may have a differing function which depends on the inertia of the movable parts involved. In the example illustrated, when one is dealing with a circular knitting machine with a relatively heavy needle cylinder 1, the needle cylinder 1 and thus the information carrier 7 are not immediately set in motion during the switch-on of the turn-on and turn-off switch 53.
  • the movement of these parts begins only after an accidental delay time of about 70 milliseconds which, in FIG. 3, is illustrated through the time interval between t and t and which depends on the inertia of the system, torsion phenomena in the drive means, etc.
  • the switching member 63 can simultaneously with the switch-on process also turn on the motor 65 if steps have been taken to make sure that the time interval between t and t within which the rated intensity of lamp I3 is normally attained, is smaller than the time interval between t and 13 Since the time interval t to t in the normal case, is only 30 milliseconds, it is not necessary to provide any additional means for turning on the motor 65.
  • the switching member 63 may be any switch such as an electronic switch which switches on the machine immediately upon operation of the switch 53 or an electronic switch such as is known in the art.
  • the transport rollers 9 of information carrier 7 can be set in motion within a time interval which is smaller than the time interval between t and t steps must be taken to make sure that the motor 65 will beginto run only with a certain delay.
  • This can. be achieved by associating with the switching member 63 a time member which delays the turn-on of the motor 65 until time t has been reached with certainty.
  • Another possibility, indicated in FIG. 2, consists inactivating the switching member 63 not through the turn-on and turn-off switch 53 but rather to connect it via a line 64 with the output of the comparison circuit 41 so that it will always be activated when the signal, appearing at the output of the comparison switch 41, has the value zero.
  • the connection point between the photoresistance 37 and resistance 73 is placed via a diode at the output 79 of the control circuit.
  • the photoresistance is only weakly illuminated so that it has a high resistance and so that at output 79 there will be a potential which roughly corresponds to the potential of pole 75.
  • a transistor 81 for voltage limitation, there may be provided as shown in FIG. 4 a transistor 81 whose base is controlled by the actual value of the lamp voltage, whose collector is located at output 79, and whose emitter is connected to a voltage divider which is located between pole 75 of the voltage source and the ground and which is made up of resistances 83, 85.
  • the dimensioning of this limiting circuit is so selected that the transistor 81 will always be connected through when the actual value of the lamp voltage exceeds a certain value that depends on the emitter voltage of the transistor 81 and thus the signal appearing at output 79 is kept constant, even if the rated intensity has not yet been achieved.
  • the switching to various throughconnection points of the transistor 81 corresponding to the various maximum voltages U U U (see also FIGS. 2 and 3), can be accomplished by means of the correspondingswitches and resistances 87, 88 which are connected parallel to the resistance 83.
  • transistor 89 whose emitter is grounded and whose collector is at output 79. Between output 79 and pole 75 of the voltage source there is the resistance 91.
  • the base of transistor 89 is controlled by a signal analogous to the actual value of the lamp'current. Transistor 89 is always connected through when the actual value of the current exceeds a preselected value, as a result of which the signal at output 79 is kept constant, even if the rated intensity is still not achieved and if therefore a higher lamp output would be required.
  • the invention is not confined to the examples described here. In particular it is immaterial at what point in the circuit diagram and with whatmeans the voltage and current limitation are accomplished. For example, it would also be possible to bring about a limitation of these values by simulating when the voltage or current boundary is reached an apparent attainment of the rated intensity, that is, upon attainment of the maximum voltage of the maximul current, it vwould be possible to feed the comparison circuit 41 a changed rated value which would cause the difference signal to disappear and which would prevent any further voltage or current increase.
  • the invention is likewise not confined to circular knitting machines instead, it may advantageously be carried out where ever at the beginning of the information carrier transport full lamp intensity must be achieved and must thereafter be maintained.
  • adjusting member 33 which, for example, can be a potentiometer or a power transistor driven by a motor.
  • a device for the optical-electrical scanning of an information carrier comprising: a scanning means having at least one lamp for scanning said information carrier; an automatic controlling system for maintaining a desired intensity of said lamp, said controlling system having a photoelectric cell for sensing the actual intensity of said lamp, comparator means for comparing said actual intensity of said lamp with said desired intensity and a controlling means for controlling said lamp so that said actual intensity does correspond to said desired intensity during scanning operations; transport means for establishing relative motion between said information carrier and said lamp for scanning operations; a switching means for switching on and off said lamp and said transport means; a voltage limiting circuit for limiting the lamp voltage, and a first timing element means associated with said voltage limiting circuit for limiting said lamp voltage when switching on said switching means at first to a value above a preselected rated voltage and a preselected time interval after said switch-on process to said rated lamp voltage.
  • the device according to claim 1 including a second timing element associated with said voltage limiting circuit for maintaining said desired intensity of said lamp a preselected time interval afer switching off said switching means.
  • said voltage limiting means includes means for limiting said lamp voltage-to a resting voltage after a delay determined by said second timing element whereby said resting voltage corresponds to the voltage when the information carrier is at a standstill.
  • the device according to claim 1 including a current limiting circuit associated with said lamp, said circuit acting when said information carrier is at a standstill and during scanning operations.
  • the device according to claim 1 including means coupled with said switchingmeans for automatically switching on said transport means after attainment of said desired lamp voltage.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
US00173374A 1970-08-22 1971-08-20 Device for the optical-electrical scanning of an information carrier Expired - Lifetime US3766394A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702041795 DE2041795C (de) 1970-08-22 Vorrichtung zur optisch-elektrischen Abtastung eines Informationsträgers

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US3766394A true US3766394A (en) 1973-10-16

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US00173374A Expired - Lifetime US3766394A (en) 1970-08-22 1971-08-20 Device for the optical-electrical scanning of an information carrier

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US (1) US3766394A (cs)
AT (1) AT332518B (cs)
BE (1) BE771666A (cs)
CH (1) CH523570A (cs)
CS (1) CS151413B2 (cs)
ES (1) ES394875A1 (cs)
FR (1) FR2104423A5 (cs)
GB (1) GB1336680A (cs)
NL (1) NL7111034A (cs)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2657613A (en) * 1947-01-29 1953-11-03 Walgreen Co Photographic printing apparatus
US2796530A (en) * 1951-10-26 1957-06-18 Muirhead & Co Ltd Stabilizing arrangements for facsimile apparatus and the like
US3157821A (en) * 1959-03-13 1964-11-17 Thorn Electrical Ind Ltd Control of lighting effects

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2657613A (en) * 1947-01-29 1953-11-03 Walgreen Co Photographic printing apparatus
US2796530A (en) * 1951-10-26 1957-06-18 Muirhead & Co Ltd Stabilizing arrangements for facsimile apparatus and the like
US3157821A (en) * 1959-03-13 1964-11-17 Thorn Electrical Ind Ltd Control of lighting effects

Also Published As

Publication number Publication date
DE2041795A1 (cs) 1972-05-25
CH523570A (de) 1972-05-31
NL7111034A (cs) 1972-02-24
BE771666A (fr) 1972-02-23
GB1336680A (en) 1973-11-07
CS151413B2 (cs) 1973-10-19
FR2104423A5 (cs) 1972-04-14
ATA679071A (de) 1976-01-15
DE2041795B2 (de) 1972-05-25
AT332518B (de) 1976-10-11
ES394875A1 (es) 1974-03-16

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