US3899686A - Apparatus and method for controlling registration - Google Patents

Apparatus and method for controlling registration Download PDF

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Publication number
US3899686A
US3899686A US407187A US40718773A US3899686A US 3899686 A US3899686 A US 3899686A US 407187 A US407187 A US 407187A US 40718773 A US40718773 A US 40718773A US 3899686 A US3899686 A US 3899686A
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US
United States
Prior art keywords
amplifier
pulse
switch
multistage process
input
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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US407187A
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English (en)
Inventor
Zdenek Luska
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.)
Bobst Mex SA
Original Assignee
J Bobst et Fils SA
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Filing date
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Application filed by J Bobst et Fils SA filed Critical J Bobst et Fils SA
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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/02—Conveying or guiding webs through presses or machines
    • B41F13/025—Registering devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/02—Arrangements of indicating devices, e.g. counters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/046—Sensing longitudinal register of web

Definitions

  • Appl, No; 407,187 57 ABSTRACT Control apparatus for controlling registration in a mul- [30]
  • Appl, No; 407,187 57 ABSTRACT Control apparatus for controlling registration in a mul- [30]
  • Appl, No; 407,187 57 ABSTRACT Control apparatus for controlling registration in a mul- [30]
  • Appl, No; 407,187 57 ABSTRACT Control apparatus for controlling registration in a mul- [30]
  • Appl, No; 407,187 57 ABSTRACT Control apparatus for controlling registration in a mul- [30]
  • Appl, No; 407,187 57 ABSTRACT Control apparatus for controlling registration in a mul- [30]
  • Appl, No; 407,187 57 ABSTRACT Control apparatus for controlling registration in a mul- [30]
  • a coupling capacitor which interconnects the photosensitive device with the control mechanism, so that changes in ambient conditions are represented primarily as changes in the charge on the capacitor, and are not manifested as signals presented to the control mechanism.
  • a condenser is sometimes called a decoupling condenser,” because it functions to decouple the input of the control mechanism from the photosensitive device.
  • the condenser also acts as a source of interference in connection with the reading of the data mark, since it retains, in the form of an electric charge, the signals which are received by the photosensitive device before the data mark is encountered.
  • the effect of the charge on the condenser is to vary the initial voltage threshold at the time of reading the data mark to be detected. This variation in the voltage threshold renders it sometimes difficult to identify the data mark signal, and in some cases may result in suppression of the data mark signal.
  • Another object of the present invention is to provide a system and method for accomplishing the foregoing with a minimum of complexity and cost of construction.
  • a phototransistor which is responsive to a change in light occurring in response to a data mark to produce a pulse corresponding to passage of the data mark through a predetermined location, an amplifier connected to a control mechanism for amplifying the pulse produced by the photosensitive device and supplying said pulse to the control mechanism, a capacitor interconnected between the photosensitive device and the amplifier, and means for shortcircuiting the input terminals of the amplifier except during predetermined time periods bracketing the time of occurrence of each of the pulses.
  • FIG. 1 is a diagrammatic illustration of a system incorporating an illustrative embodiment of the present invention
  • FIG. 2 is a circuit diagram of the apparatus illustrated in FIGv I.
  • FIG. 3 is a circuit diagram of apparatus embodying the present invention, shown in more detail.
  • a photoelectric cell 1 is interconnected by means of a condenser Cl and a coupling resistor R1 to the input of an amplifier 2.
  • the amplifier is provided with a feedback resistor R2, selected to provide the appropriate gain for the amplifier 2 while insuring stability of operation.
  • a switch 3 is provided for selectively grounding the junction between the capacitor C1 and the resistor R1, effectively shortcircuiting the input of the amplifier 2.
  • the switch 3 is illustrated as connected by a control line 5 to a control unit 4.
  • the switch 3 may be a cam operated switch, with the control unit 4 taking the form of a cam rotatable with a drive shaft of the multi-station machine, so that the switch 3 is open only at certain periods and is closed between such periods. These periods coincide with the so-called window periods" described in my co-pending application, Ser. No. 339,926, referred to above, and the disclosure of which is hereinto incorporated by reference.
  • the switch 3 may take the form of an electronic switch which is controlled electrically by means of a signal derived from a control until 4, responsive to each rotation of a drive shaft of the multistation system for producing a pulse or other control signal which functions to momentarily open the switch 3 during the window period.
  • a signal derived from a control until 4 responsive to each rotation of a drive shaft of the multistation system for producing a pulse or other control signal which functions to momentarily open the switch 3 during the window period.
  • the output of the amplifier 2 is connected to control apparatus (not shown) by which the registration of the multi-station system is regulated and controlled.
  • control apparatus may be, for example, the computing apparatus illustrated and claimed in a co-pending patent application of Roger-Henri Roch, Ser. No. 295,969, the disclosure of which is hereinto incorporated by reference.
  • a phototransistor TI is employed as the photosensitive element. Its collector is connected to a source of operating potential at a line 10, and its emitter is connected through a resistor R3 to a negative reference potential on a line 12.
  • the emitter of the phototransistor TI is connected through the coupling capacitor C1 to the input of an amplifier incorporating three transistors, T2, T3, and T4.
  • the transistors T2 and T3 are both connected in cascade in common emitter configuration, while the transistor T4 is connected as an emitterfollower amplifier.
  • the collectors of the transistors T2 and T3 are connected to the line 10 by means of resistors R5 and R9, respectively.
  • the emitter of the transistor T3 is connected by means of a line 14 to ground, while the emitter of the transistor T2 is connected by means of a resistor R6 to the line 12.
  • the emitter of the transistor T4 is connected to the output line 16, and is also connected to the line 12 by means of a resistor R12.
  • a network including resistors R7 and R10 and acapacitor C2 is connected to furnish a feedback signal, derived at the emitter of the transistor T4, to the emitter of the transistor T2, to establish the gain of the multistage amplifier and to assure stable operation.
  • the switch 3 is interconnected between the base of the transistor T2, which forms the input stage of the three stage amplifier, and ground.
  • the switch 3 When the switch 3 is open, the emitter of the phototransistor Tl produces a signal which passes through the condenser Cl and is developed across the input resistor R4, interconnected between the base of the transistor T2 and ground.
  • the switch 3 When the switch 3 is closed, however, the input resistor R4 is short-circuited, with the result that the output 16 of the amplifier is maintained at a uniform level, indicative of the absence of a data mark pulse.
  • the capacitor Cl is 0perative to pass pulses from the phototransistor TI to the base of the transistor T2, so that a positive pulse is produced on the output line 16 in response to recognition of a data mark. Any variations in charge in the capacitor, however, which may accompany noise pulses developed by the phototransistor T1, are not manifested in changes in the input level applied to the amplifier.
  • FIG. 3 a circuit embodying the present invention is shown in greater detail.
  • the circuit of FIG. 3 the circuit of FIG. 3, the
  • phototransistor T1 has its collector connected to the line 10 and its emitter connected through the resistor R3 to the line 11, which has a reference potential established thereon by virtue of a zener diode l8 and a resistor 20 interconnected between ground potential and the line 12, the line 12 being connected to a source of negative potential at a terminal 22.
  • a certain negative potential, relative to ground is established on the line 11.
  • the emitter of the phototransistor T1 is connected through an amplifying stage comprising a transistor T5 connected in emitter-follower configuration.
  • the emitter of the transistor T1 is connected to the base of the transistor T5, and the emitter and the base of the transistor T5 are connected, respectively, through resistors R14 and R16 to the line 10 and to the terminal 22.
  • An amplified signal is made available at the emitter of the transistor T5, and the emitter is connected through the capacitor C l to the base of the first stage transistor T2 of the three stage amplifier.
  • the base of the transistor T2 is also connected to ground through the resistor R4.
  • the amplifier circuit incorporating the transistors T2, T3, and T4 is connected in substantially the same manner as illustrated in FIG. 2.
  • a resistor R13 connects the collector of the transistor T4 to the line 10.
  • the potential on the line 10 is derived by a circuit including a zener diode 24 and a resistor 26 connected between ground and a terminal 28 which is connected to a positive source of potential.
  • the line 10 which is connected to the junction of the diode 24 and the resistor 26, is maintained at a constant positive potential relative to ground.
  • the switch 3 illustrated in FIG. 3 includes a set of contacts extending between lines 30 and 32. These contacts are equivalent to the contacts illustrated in FIGS. 1 and 2 and are normally closed, but are open during the window periods, when it is desired to read a data mark.
  • Two terminals 34 and 36 are adapted to be connected across a source of potential, and complete an electrical circuit extending from the source through a relay coil 38 associated with the set of contacts and a cam-operated switch 40.
  • the switch 40 is caused to change from its normally closed state to an open state by rotation of a cam 42, when a notched area 44 rotates into juxtaposition with the switch 40. This occurs during the window period as described above.
  • switches may be employed for executing the function of the switch 3, and it is also contemplated that a variety of different constructions of amplifiers may be employed with the present invention, other than the specific forms illustrated.
  • a system for controlling registration in a multistage process comprising means for generating a pulse in response to detection of a data mark on a strip of material being processed by said multistage process, an amplifier for amplifying said pulse, a capacitor for interconnecting said pulse generator and said amplifier, and a selectively operable switch for normally shortcircuiting the input of said amplifier.
  • Apparatus according to claim 1 including means for periodically opening said switch at a time coinciding with the generation of said pulse.
  • said generating means comprises a photosensitive device adapted to produce a pulse in response to a data mark on said strip.
  • said photosensitive device comprises a phototransistor.
  • said amplifier comprises a multistage amplifier, and feedback means interconnected between the input and output of said multistage amplifier.
  • Apparatus according to claim 1 including means for opening said switch periodically for establishing window periods coinciding with pulses generated in response to a plurality of data marks spaced along said strip.
  • Apparatus according to claim 6, including means for operating said switch in synchronism with the operation of said multistage process.
  • the method comprising the steps of spacing a plurality of data marks along the length of a strip of material being processed by said multistage process, generating pulses in response to the passage of said data marks through a predetermined location, providing an amplifier for amplifying said pulses, connecting said pulses through a capacitor to said amplifier, and shortcircuiting the input of said amplifier except during periodic times coinciding with the arrival of said data marks at said predetermined location.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Artificial Intelligence (AREA)
  • Mechanical Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Control Of Position Or Direction (AREA)
  • Handling Of Sheets (AREA)
US407187A 1972-10-27 1973-10-17 Apparatus and method for controlling registration Expired - Lifetime US3899686A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1571372A CH556738A (de) 1972-10-27 1972-10-27 Dispositif de lecture d'une installation pour la commande de la mise en registre d'une operation dans une machine d'imprimerie ou de cartonnage.

Publications (1)

Publication Number Publication Date
US3899686A true US3899686A (en) 1975-08-12

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Family Applications (1)

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US407187A Expired - Lifetime US3899686A (en) 1972-10-27 1973-10-17 Apparatus and method for controlling registration

Country Status (9)

Country Link
US (1) US3899686A (enExample)
JP (1) JPS49126410A (enExample)
CA (1) CA1010527A (enExample)
CH (1) CH556738A (enExample)
DE (1) DE2352960B2 (enExample)
ES (1) ES420025A1 (enExample)
FR (1) FR2205233A5 (enExample)
GB (1) GB1428569A (enExample)
IT (1) IT998981B (enExample)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2217833A (en) * 1988-04-30 1989-11-01 Cranfield Inst Of Tech Registration mark detection system
US6059705A (en) * 1997-10-17 2000-05-09 United Container Machinery, Inc. Method and apparatus for registering processing heads

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3720837A (en) * 1971-12-20 1973-03-13 Miles Lab Measuring and indicating apparatus
US3789215A (en) * 1972-09-08 1974-01-29 Ibm Photosensitive document detector with automatic compensation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3720837A (en) * 1971-12-20 1973-03-13 Miles Lab Measuring and indicating apparatus
US3789215A (en) * 1972-09-08 1974-01-29 Ibm Photosensitive document detector with automatic compensation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2217833A (en) * 1988-04-30 1989-11-01 Cranfield Inst Of Tech Registration mark detection system
US6059705A (en) * 1997-10-17 2000-05-09 United Container Machinery, Inc. Method and apparatus for registering processing heads

Also Published As

Publication number Publication date
DE2352960B2 (de) 1976-04-01
DE2352960A1 (de) 1974-05-09
ES420025A1 (es) 1976-03-16
IT998981B (it) 1976-02-20
FR2205233A5 (enExample) 1974-05-24
CH556738A (de) 1974-12-13
JPS49126410A (enExample) 1974-12-04
GB1428569A (en) 1976-03-17
CA1010527A (en) 1977-05-17

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