US 3648911 A
In a web registering device for a rotary press containing data to be printed on one side of a web having preprinted data on its opposite side, the web is entrained around a control roller mounted in the press and connected at one end by gears to a brake. An electrical circuit, including sensing means reading the position of register marks preprinted on the web and coordinated with a circuit completed by a switch closed by a cam, mounted on one end of a press cylinder, controls the position of the preprinted web with respect to the data being printed on its opposite side by operating air valves applying or releasing the brake.
Claims available in
Description (OCR text may contain errors)
United States Patent Pekrul  ROTARY PRESS PREPRINTED WEB REGISTERING DEVICE  Inventor: Roger K. Pekrul, Choctaw, Okla.
 Assignee: The Oklahoma Publishing Company,
Oklahoma City, Okla.
22 Filed: Apr-2, 1970 21 Appl.No.: 25,142
2,768,827 10/1956 Noble ..226/28X 5] Mar. 14, 1972 3,101,915 8/1963 Aaron ..226/38X 3,510,036 5/1970 Lewis ..226/30X Primary ExaminerRichard A. Schacher Attorney-Robert K. Rhea  ABSTRACT In a web registering device for a rotary press containing data to be printed on one side of a web having preprinted data on its opposite side, the web is entrained around a control roller mounted in the press and connected at one end by gears to a brake. An electrical circuit, including sensing means reading the position of register marks preprinted on the web and coordinated with a circuit completed by a switch closed by a cam, mounted on one end of a press cylinder, controls the position of the preprinted web with respect to the data being printed on its opposite side by operating air valves applying or releasing the brake.
1 Claims, 7 Drawing Figures PATENTEDMAR 14 m2 3,648,911
SHEET 2 UP 3 ROGER K. PEKRUL INVENTOR PATENTEDMAR14 I972 SHEET 3 0F 3 ROGER K. PEKRUL INVENTOR ROTARY PRESS PREPRINTED WEB REGISTERING DEVICE BACKGROUND OF THE INVENTION 1. Field of the invention.
The present invention relates to rotary press controls and more particularly to the registration of a preprinted web with other data being printed on its opposite side and with data being printed on other webs.
In printing of newspapers on rotary presses, data, such as advertising, is frequently preprinted on one side of a news print web in newspaper sheet size and the web is then rewound into a storage or supply roll from which the preprinted web is subsequently unwound and delivered at high speed to one station of a rotary press for printing data on its opposite side in newspaper sheet size and in registration with the preprinted web data.
Registration of a preprinted web, with the data to be printed on its opposite side and with other webs being simultaneously printed in the rotary press, is difficult for a number of reasons, one such reason being the distance or pitch between the repetitive printed data on the web may not be exactly uniform and, therefore, may not match the pitch of the press rollers into which the web is fed. Furthermore, the preprinted data may not exactly match other data being printed on other webs in the rotary press with which the preprinted web is to be collated. In addition to these differences further changes in the pitch or distance between the repetitive printed data on the preprinted web may occur by reasons of variation in temperature, moisture content of the web or by reason of variation of tension applied to the web in its tortuous path around conventional rollers forming a part of the press.
Some of the previous attempts to effect registration of a preprinted web with respect to data being printed on its opposite side have been unsuccessful generally because of difficulty experienced in controlling the speed at which the preprinted web is supplied from the unwinding storage roll. The occurrence of inaccuracies in the control of the web supply speed permits the tension in the web to be too loose and, therefore, uncontrollable or too tight and thus subject to breakage under excessive tension.
It has been proposed to compensate for variations in pitch length in preprinted webs by the application of moisture to the web so that the printed matter thereon may be brought into register with other matter or data being printed on the opposite side of the web without subjecting the web to excessive tension. However, the application of moisture to a web is objectionable as the result of a slow response or time lag between the time of moisture application and the corresponding effec tive change to achieve registration of the web. Furthermore, it is not practical in some printing operations to use moisture on the web particularly when the opposite side thereof is to be printed.
2. Description of the prior art.
This application is an improvement over US. Pat. No. 3,386,637 for Rotary Press Web Registering Device. This patent discloses means for visual registration of the web and manually operated means to effect adjustment of the'web position to correct an out of registration position of the web. This application incorporates a sensing means in its electrical circuit for operating a web travel brake in response to an out of registration position by advancing or retarding the rate of travel of the web with respect to the position of a register mark printed on the web and a function of the press. An automatic web registering device is disclosed by U.S. Pat. No. 3,097,844 which features a photoelectric scanner for detecting register errors which operates variable speed transmission controlling the supply roll by adjustably moving a movable rollerto effect differences in pitch of preprinted data on a web to be correlated with data on other webs. This application features a photoelectric scanning device detecting in or out of registration of preprinted data on the web which, through an electric circuit, operates an air brake mounted on one of the rollers interposed between the supply roller and the printing cylinder for releasing the roller or retarding its rotation, in response to whether the web is to be advanced or retarded to effect an in" register position.
SUMMARY OF THE INVENTION This device is used in combination with a rotary newspaper printing press having impression rollers or printing cylinders around which the web is entrained from an unwinding storage reel, synchronized with the cylinders, with the web entrained around other rollers in a tortuous path and collated with other webs terminating in. a cut and fold mechanism. A control roller is interposed in the press in spaced parallel relation between the preprinted supply roll and printing cylinders. The preprinted web is entrained around the control roller and in the path formed by the other rollers of the press. The control roller is connected'by gears to a water controlled air brake with the brake released and applied by air under pressure from solenoid operated air valves. An electrical circuit, including photoelectric scanning means for reading the position of registration marks preprinted on the web, is synchronized with a reference pulse obtained from a switch mounted on the press and closed by a cam on one printing cylinder for energizing one of the brake controlling air valves to release or apply the brake. Time delay means, forming a part of the circuit, provides a time lapse between web advance or retard signal corrections for eliminating continuous application or release of air to the air brake. Installation of this invention on an existing rotary newspaper press requires only the addition of the control roller, the water cooled air brake and its control valves, a cam on one end of one press cylinder and an electrical circuit. The circuit includes photocell scanners and a pulse shaping and amplifying circuit for energizing relays and operating the control valve solenoids in response to photocell signals.
The principal object of this invention is to provide a means for effecting accurate longitudinal registration of repetitive preprinted webs drawn from a supply roll under the influence of an automatic variable speed drive synchronized with the operation of the remainder of the press for collating data on the preprinted web with data to be printed on its opposite side and with the data printed on other webs entrained through the press and simultaneously printed.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a fragmentary diagrammatic view illustrating the path of the preprinted web through a portion of a newspaper rotary printing press;
FIG. 2 is a plan view of a fragmentary portion of the preprinted web;
FIG. 3'is a fragmentary perspective view of one unit of a newspaper rotary press having a preprinted web entrained therethrough illustrating the relative position of a portion of the control means;
FIG. 4 is a fragmentary elevational view of the control roller and the water cooled air brake;
FIG. Sis a top view of FIG. 4;
FIG. 6 is a wiring diagram of the electrical power source; and,
FIG. 6A is a wiring diagram forming a continuation of the diagram of FIG. 6.
DESCRIPTION OF THE PREFERRED EMBODIMENTS Like characters of reference designate like parts in those figures of the drawings in which they occur. I
In the drawings:'
The reference numeral 10 indicates, generally, one section or unit of a rotary newspaper press having a frame 12 which journals impression cylinders 14 and 16 and back-up" cylinders l8 and 20. A reel or rolled web holding means 22, usually positioned in a reel room, not shown, downwardly of the press unit 10, supports the supply roll 24 comprising the preprinted web. A single thickness of the web, indicated at 25, from the supply roll, is entrained in a tortuous path around conventional rollers 26, around the backup rollers 18 and 20 and around other rollers 28, above the unit 10, terminating with other webs, not shown, from other similar units of the press, not shown, at a conventional cut and fold apparatus 30. The cylinder 14 has a stereotype plate mounted thereon, not shown, which prints the blank side of the web 25.
A control roller 35 is mounted within the press, above and in spaced parallel relation with respect to the supply roll 24, by bearings 36 and supports 38 attached to the press reelroom frame, indicated at 40, only one end of the roll mounting being shown (FIG. 4). One end of the roller 35 is coaxially connected with a spur gear 42 which meshes with a cooperating spur gear 44 coaxially connected with a variable speed control means comprising a water cooled tension air brake assembly 45 in turn connected with a cross-brace frame member of the press, indicated at 46. The water cooled air brake 45 is conventional and is presently available under the trade name Wichita Water Cooled Brake. The brake 45 is provided with a pair of tubes 48 which continuously supply water to the interior of the brake from a source of supply, not shown. The air brake is connected with air conducting tubes 49 and 50 from a source of air under pressure, not shown, which actuates the air brake and controls the speed or rotational velocity of the gear 44 in the manner presently described.
As shown in FIG. 2, the preprinted web 25 has a series of longitudinally spaced-apart rectangular newspaper page size sections 52 printed thereon between its respective side edges leaving a transverse marginal blank area 54 between successive areas 52 of the web. These transverse marginal areas 54 are provided, adjacent one or both marginal side edges of the web, with a relatively heavy preprinted register mark 56 for the purposes presently apparent.
Referring more particularly to FIG. 3, register mark position sensing means, including a scanning head 58, is mounted on the press unit frame 12 by a suitable bracket means 60 so that the scanning head overlies one marginal edge portion of the web 25. The scanning head contains three photocell lamps providing illumination for three photocells arranged in close spaced relation parallel with the direction of web travel as hereinafter described more fully.
A cam 62 is coaxially adjustably mounted by screws 64 on one end ofa shaft 66 coaxially connected with the cylinder 20 and projecting outwardly of the frame 12. The cam 62 is provided, on its periphery, with a detent 68 (FIG. 1) for closing a microswitch MS mounted on the frame 12 for the reasons presently explained.
CIRCUIT POWER SUPPLY The primary winding of a conventional transformer TRl is connected with a source of electrical energy AC through an off-on" control switch S1. The secondary side of the transformer TRl is center tapped with taps for volts and 6 volts. The high voltage portion of the secondary winding is connected with the plates of a rectifier D1. The 5 volt secondary tap wires are connected to the filaments of the rectifier D1. A full wave is obtained from the cathode of the rectifier D1 which is filtered and smoothed by two high value resistors R1 and R2, connected in series by a wire 72, with two capacitors C1 and C2 connecting the wire 72 to ground. This provides a high voltage source B+ with the voltage being regulated by two regulating tubes D2 connected in series to the wire 72 and to ground. Two wires F, connected with the 6 volt secondary tap wires 70 and 71, are connected with the respective filaments F of other tubes to be hereinafter described.
The wire 70 is connected by a wire 74 to three photocell lamps L1, L2 and L3 mounted and connected in series in the scanning head 58 through a resistor R3 and to the wire 71 by the wiper of a potentiometer P1 for adjusting the brightness of the lamps L1, L2 and L3 for the purposes presently apparent.
The wire 71 of the 6 volt secondary tap is connected to ground and the other wire 70 forms an added circuit to provide a 6 v. bias voltage by interposing a diode D3 and resistor R4 in series in this wire. A capacitor C3 is connected across the wires and 71 between the diode D3 and resistor R4 to filter the -6 v. voltage. Power for the circuit of FIG. 6A is supplied by the power circuit of FIG. 6.
GENERAL DESCRIPTION OF CIRCUIT All components are shown in deenergized position. The circuit of FIG. 6A includes three photocells or photodiodes PC 1, PC2 and PC3 mounted in close spaced relation in the scanning head 58 and in longitudinal alignment with the path of travel of the register marks 56. Photodiode pulses are respectively amplified by variable gain amplifiers consisting of three dual triode tubes T1, T2 and T3 and then passed to a pulse shaper and further amplified with dual triode tubes T4, T5 and T6. After shaping to a square wave the pulse is sent to coincidence detectors comprising two dual triode tubes T7 and T8 enclosed by shield lines 75. The coincidence detector tubes T7 and T8 require that two pulses enter the respective tube section at the exact time to create a coincidence for transferring the pulses to other components. The other pulse is generated by the microswitch MS being closed by the rotating press cylinder 20. When the microswitch MS closes, its pulse is amplified and shaped by a dual triode tube T9 which transmits the amplified pulse to the coincidence detector tubes T7 and T8. Thus, three pulses are generated in sequence by one of the register marks 56 passing through the scanning path of the photocells PCl, PC2 and PC3 so that these three pulses are amplified and transmitted to the coincidence detector tubes T7 and T8. When a coincidence of two pulses is detected by one section of either of these detector tubes as a result of a pulse from the press microswitch MS, this detector section will conduct, transmitting a correction pulse for longitudinal displacement of the web 25. The correction pulse outputs of the detector tubes T7 and T8 are connected respectively to three gas-filled tetrode tubes T10, T11 and T12 which respectively indicate either up, home" or down" corrections of the web 25. These three tetrode tubes respectively energize normally open relays X, Y and Z, connected with air valves controlling an air supply to the air brake 45 through a time delay means including a single tube T13 enclosed by the shield lines 76.
PULSE SHAPING Since the dual triode tubes Tl through T6 are connected by pairs to the respective photodiodes, only the circuit connecting the tubes T1 and T4 with the photodiode PCl will be described in detail in the interest of brevity.
As stated hereinabove, the 6 volt wires F are connected to the filaments F of all the tubes Tl through T13. The 6 v. of the power supply is connected in series to the photodiodes PCl, PC2 and PC3. When the photodiode PCl is activated by the passage of a register mark 56, a pulse is generated so that a 6 v. current flows through the photodiode PCl to ground over the wire 78 and through a resistor R5. The wire 78 is connected with a capacitor C4. The other side of the capacitor C4 is connected to the grid of the first amplification stage of the tube T1. The cathode of the first stage of tube T1 is connected to ground. This first amplification stage is self-biased to cut off to ground through a resistor R6. The plate of this stage of the tube T1 is connected to the power voltage source B+ through a plate resistor R7. Passage of a register mark 56 across the scanning path of the photodiode PCl decreases the illumination to this photodiode thus generating a positive going pulse from the capacitor C4 causing the first stage of the tube T1 to conduct. Therefore, a negative going pulse is generated at the first stage plate of tube TI. This plate is connected to the grid of the second amplification stage of the tube Tl through a capacitor C5 and one end of the coil of a potentiometer P2. The other end of the coil of potentiometer P2 is connected to ground. The cathode of the second stage of tube T1 is connected to ground through a resistor R9. The second amplification stage of tube T1 is normally conducting by the wiper of the potentiometer P2 connected to the grid. When the negative pulse is impressed on the capacitor C5, the tube T1 will cut off generating a positive going pulse at the plate of the second stage of this tube by this plate being similarly connected to the voltage source B+ through a resistor R8.
The purpose of the variable gain potentiometer P2 is to amplify only desired pulses and not pulses which may be generated by press vibration, flopping of the web, paper density or other causes. When the desired pulse is amplified at the second stage of the tube T1, it is passed to the first stage grid of the tube T4 by a wire 80 with a capacitor C6 interposed in this wire. The tube T4 is a monostable vibrator used as a wave shaper and trigger pulse commonly referred to as a single one-shot tube. The first grid of the tube T4 is connected to the power source B+ through a resistor R10 causing this side of the tube T4 to conduct. The other grid of this tube T4 is cut off with a self-biased resistor R11 connecting the grid to ground. The plate of the first stage of this tube is connected to the power source B+ through a resistor R12. Both stage cathodes of this tube are connected to ground through a common resistor R13 which allows only one side of this tube to conduct at a time. The wire 80 is also connected to ground through a capacitor C7. Thus, when the positive pulse from the last amplification stage of the tube T1 is impressed on the capacitor C6 a pulse is generated over the wire 80 to the first stage grid of the one-shot" tube T4 with the pulse being shaped by the capacitor C7. The negative trailing edge of this pulse causes the first stage of the one-shot tube T4 to cut off generating a positive pulse at the plate of its first stage. This plate is connected to the grid of the second stage of this tube by a capacitor C8. This positive going pulse causes the second stage of the tube T4 to conduct for the length of time required for the discharge of the capacitor C8 to ground through the resistor R11 generating a one-shot" effect and a high value trigger pulse. A negative pulse is generated at the plate of the second stage one-shot (tube T4) by a resistor R14 connecting this plate to the power source B+. An indicator lamp L4 is connected in parallel with the resistor R14 for visual indication of the one-shot" operation of the tube T4.
The output from the plate of the second amplification stage of the tubes T4 and T5 are connected to the cathodes of the tube T7 by wires 82 and 84 while the output of the tube T6 is connected to one cathode of the tube T8 by a wire 86, the other cathode of the tube T8 being connected to ground by a resistor R15.
REFERENCE PULSE As disclosed hereinabove, the microswitch MS, mounted on the press frame 12 adjacent one end of the cylinder 20, is closed by the detent 68 on the cam 74 during each revolution of the cylinder. One contact of the switch MS is connected to the current source B+ through a resistor R16. The other contact of the switch MS is connected to ground through a resistor R17. One lead of a capacitor C9 is connected between the switch MS and the resistor R17. The other lead of the capacitor C9 is connected by a wire 88 to the grid of one stage of the tube T9. The wire 88 is connected to ground through a resistor R18. The dual triode tube T9 is variable width trigger" tube having a common cathode connected to ground through a resistor R19 assuring that only one stage of the tube T9 can conduct at a given time. The plates of the tube T9 are connected to the current source B+ through resistors R20 and R21, respectively. When the microswitch MS is closed by the cylinder to charge the adjacent side of the capacitor C9, a positive pulse is applied to the grid of the first stage of the tube T9 causing it to conduct and generating a negative pulse at the plate of the first stage which is transmitted to the grid of the second stage of this tube by a wire 90 having a capacitor C10 interposed therein. This pulse will interrupt conduction of the second stage of this tube by a potentiometer P3 having one end of its coil connected to the wire 90 through a resistor R22 and its wiper connected with the current source B+. The purpose of the potentiometer P3 being to vary the pulse width obtained at the plate of the second stage of the tube T9 so that regardless of the angular rate of rotation of the cylinder 20 a pulse of the same width is generated at the plate of the second stage of the tube T9 each time the microswitch MS is closed. The pulse from the plate of the second stage of the tube T9 is connected by a wire 91 to the four grids of the tubes T7 and T8 through a capacitor C11. The right-hand grid, as viewed in FIG. 6A, of the tube T8 is used only for visual indication of the reference pulse which is obtained by a wire 92 connecting the wire 91 to the grid through a resistor R23 with the grid biased to cut off by connection with the 6 v. source through a resistor R24. The plate of this section of the tube T8 is connected with a lamp L5 in turn connected with the power source B+. A resistor R25 is connected in parallel with the lamp L5, thus, when a positive pulse is received from the trigger tube T9, the filament of the lamp L5 will be excited visually indicating the presence of the pulse. This pulse from the tube T9 is, therefore, simultaneously applied to the grids of the three other sections of the tubes T7 and T8 which would normally cause these tube sections to conduct, however, as stated hereinabove, the cathodes of these three tube sections are connected, respectively, with the plates of the final amplification stages of the one-shot" tubes T4, T5 and T6 by the wires 82, 84 and 86. The plates of the tube T7 are respectively connected to the primary side of a pair of transformers TR2 and TR3 and, in turn to the current source B+ through resistors R26 and R27, respectively. Similarly, the plate of the left hand section, as viewed in FIG. 6A, of the tube T8 is con nected to a transformer TR4 and, in turn to the current source B+ through a resistor R28. The photodiode amplification function is now complete.
When the photodiodes PC1, PC2 and PC3 shut off, as a result of decrease of light intensity caused by the passage of the register mark 56 on the newspaper web 25, a negative value pulse is generated at the last stage of the one shot tubes T4, T5 and T6, respectively. This pulse is transferred, by the wires 82, 84 and 86, to the cathodes of the three tube sections of the tubes T7 and T8, as disclosed hereinabove. These three sections of these two tubes T7 and T8 are called and" gates. In order for an and gate to conduct a positive pulse must be applied to the grid simultaneously with a negative pulse applied to the cathode. When this condition is achieved, this tube section or and gate will conduct.
Stated briefly, a pulse from a photodiode and a pulse from the microswitch must coincide at one of the "and" gates to produce an output pulse. Since three photodiode circuits are used, the passage of the register mark 56 may generate three different output pulses from the and gates which reveals the relationship of the web register mark with respect to the desired position when passing the press cylinder 20. These three pulses may now be referred to as up" corrections for the photodiode PCl; normal or home position" for the photodiode PC2; and down corrections for the photodiode PC3.
RELAYS The circuits connecting the three gas-filled tetrode tubes T10, T11 and T12 to their respective relays X, Y and Z are identical and only the circuit connecting the tube T10 to the relay X will be described in detail in the interest of brevity. The control grid of the tube T10 is connected to the 6 v. source through a resistor R29. The cathode is connected to ground and to the other grid. The plate of the tube T10 is connected to one terminal of the coil of the relay X. The plate connected terminal of the relay X is connected with the plate connected terminal of the other two relays Y and Z through capacitors C12 and C13. The purpose of these two capacitors C12 and C13 is to extinguish any tube conduction when a different tube must conduct to obtain a desired correction. The other terminal of the relay X is connected with the current nun-m source B-lthrough a suitable resistor R30. An indicator lamp L6 is connected in parallel with the terminals of the relay X to provide visual indication of a correction pulse. One terminal of the secondary winding of each of the transformers TR2, TR3 and TR4 is connected to ground and the other terminal of each of these secondary windings is connected, respectively, by wires 98, 100 and 102 to the control grid of the tubes T10, T1 1 and T12, respectively, through three capacitors C15, C16 and C17, respectively, so that an output pulse from one of the plates of the trigger tubes T7 and T8 is applied to the respective capacitor C15, C16 or C17 which in turn energizes the respective tube T10, T11 or T12 and its respective relay X, Y or 2. Thus, these three relays may be labeled up" correction for relay X; home or normal for relay Y; and, down correction for relay Z. The plate connected terminal of the relay Y is also connected to a normally open push button switch 83 through a capacitor C14 with the other terminal of the switch S3 connected to ground to manually extinguish an undesired correction pulse.
AIR BRAKE CONTROL VALVES A conventional solenoid operated air valve V2 is interposed in the air lines 49 and 50 supplying air pressure to the air brake 45. A source of electrical energy AC is connected to the solenoid of the valve V2 through an off-on" manual control switch 35. An up" register mark correction air valve V1 is connected with the air release line 49. Similarly, a third air valve V3, connected with the source of air under pressure, not shown, is connected with the air pressure line 50. Thus, the three air valves V1, V2 and V3, respectively, assist in the function of register mark correction as up correction, normal or home" and down correction.
One terminal of the relay X is connected with one terminal of the solenoid of the valve V1. Similarly the relay Z has one terminal connected with one terminal of the valve V3. The other terminal of the solenoids of these two valves V1 and V3 are connected in parallel to one wire 94 of a current source AC. The other wire 96 of this current source connects the armatures of the relays X and Z in parallel through a series connected normally closed off-on" switch S6 and the armature ofa normally open time delay relay W.
For the solenoid of either of the air valves V1 or V3 to be energized the time delay relay W must close its armature in the manner presently explained.
TIME DELAY The time delay relay circuit comprises a source of electrical energy AC having one wire 104 connected to the cathode of the single tube T13. The other AC source wire 106 is connected to one terminal of a resistor R31 with the other end of this resistor connected by a wire 108 to the armature of the relay Y. The armature contact of the relay Y is connected by a wire 110 to the control grid of the tube T13 through a diode D4. One end of the coil ofa potentiometer P4 and its wiper is connected in parallel across the diode D4 to the wire 110. A capacitor C18 also connects the terminal end of the wiper to the wire 104. The plate of the tube R13 is connected to one terminal of the coil of the relay W and the plate is also connected to the center grid of the tube T13. The other terminal of the relay W coil is connected to the source wire 106 by a wire 112. A capacitor C19 is connected to the wire 112 and plate circuit of the tube T13 in parallel with the coil of the relay W. The wiper arm setting of the potentiometer P4 forms the adjustment or the desired time delay required before the relay W is energized to close its armature when the normal" relay Y is deenergized. Stated another way, when the register mark 56 is in its desired normal or home" position coinciding signals from the middle photodiode PC2 and microswitch MS maintain the relay Y energized and its armature closed thus applying negative current to the grid of the time delay tube T13. This negative energy prevents conduction of the tube T13 therefore the relay W remains deenergized. When the web 25 is out of register, in either direction, its register mark 56 and the microswitch MS generate a coincidence signal requiring an up" or down" correction, as explained hereinabove, thus energizing and closing the relay X or the relay Z as the case may be. Thus the relay Y is deenergized and its armature moves to open" position. When the normal" relay Y deenergizes the contacts in the grid of the time delay tube T13 open permitting the capacitor C18 to discharge the negative voltage applied to the grid by the diode D4 through the potentiometer P4. Discharging this negative voltage permits the tube T13 to conduct thus energizing the relay W in its plate circuit. When the armature of the relay W is closed, current is applied to the solenoid of the air valve Vl or V3 in response to the pulse received by the tube T10 or T12, respectively.
The air valve V2 normally maintains the required air pressure on the air brake 45. Whenever the register mark 56 is out of register in a retarded or lagging position requiring an up" correction the current applied to the solenoid of the valve V1 shifts this valve to open position to release or further open the air brake exhaust line 49 so that the control roller 35 rotates more freely to permit advancement of the web 25. Conversely, if the position of the register mark 56 is out of register in a forward direction and the web needs retarding or a down" correction, a pulse or correction signal, energizing the solenoid of the valve V3, applies additional air pressure to the air brake supply line 50 to further apply the brake and retard the rate of travel of the web 25. These up and down corrections of the position of the web 25 are minimized and eliminated when the register mark is within predetermined tolerances by the time delay means controlling the relay W.
By way of example but not limitation, the following types and values of the components provides a satisfactorily operating circuit.
Component and reference Diode D1 5Y3 Rectifier Diode D2 082 regulator Diode D3 Diode No. [N646 Diode D4 Diode Nor SDSOO Photodiode PCl, PCZ, and PC3 Tube T1. T2, T3, T7, and T8 Tube T4, T5, and T6 Tube T9 Tube T10, T11, and T12 Photodiode No. H38 No. 12AX7 No. 12AU7 Dual Diode No. 6.16 Tetrodes No. 2D21 or No. 5727 Tube T13 Single No. 6AQ5 Resistor R1 and R2 500 ohms Resistor R3 3 ohms Resistor R4 47 ohms Resistor R5 and R10 2.2 megohms Resistor R6 240K ohms Resistor R7 510K ohms Resistor R8 and R22 K ohms Resistor R9 2.2K ohms Resistor Rll 220K ohms Resistor R12 10K ohms Resistor R13 2.7K ohms Resistor R14 27K ohms Resistor R15 8.2K ohms Resistor R16 18K ohms Resistor R17 and R18 330 K ohms Resistor R19, R20, and R21 471( ohms Resistor R23, R24, and R29 1 megohms Resistor R25 470K ohms Resistor R26, R27, and R28 4.7 K ohm Resistor R30 38K ohm Capacitor Cl and C2 40 mi. Capacitor C3 50 ml. Capacitor C4, C8, C15, C16, and C17 0.01 mf. Capacitor C5 0.02 mt. Capacitor C6 and C9 0.047 mf. Capacitor C7 0.002 ml. Capacitor C10 0.0047 ml. CapacitorCl1,Cl2.C13, and C14 0.15 mi. Capacitor C18 16 ml. Capacitor C19 2 m1. Potentiomeler P1 500 ohms Potentiometer P2 1 megohms Potentiometer P3 500K ohms Potentiometer P4 IOOK ohms Relays W. X. Y, and 2 K ohms Valves V1, V2, and V3 4-way Z-position Obviously the invention is susceptible to changes or alterations without defeating its practicability, therefore, I do not wish to be confined to the preferred embodiment shown in the drawings and described herein.
1. In a rotary press having guiding means including spacedapart rollers defining a path of movement for a continuous web from an unwinding supply roll thereof, said web having register marks preprinted thereon at spaced intervals on at least one marginal side edge, the improvement comprising:
a variable speed roller transversely journaled by said press in said path of movement and contacting said continuous web for longitudinally adjusting its position during movement along said path, said roller having a coaxially connected spur gear at one end;
a fluid pressure operated brake mounted on said press and having a spur gear in mesh with the spur gear on said roller;
a plurality of tubing and solenoid valve means connecting said brake with a source of fluid under pressure, one said valve means being capable of releasing said brake and another of said valve means being capable of applying said brake;
detecting means including a primary circuit generating primary signals in response to the passage of said register marks through a predetermined point in said path corresponding to a correct registration position of said web with respect to said press function,
said primary electrical circuit including first and second normally open relays connected, respectively, with and controlling said brake release and said brake applying solenoid valves,
a third normally closed relay,
a time delay circuit connected with said third relay,
a plurality of photocell means including first, second and third voltage generating photodiodes disposed in said path and corresponding, respectively, to an advanced, in register and retarded position of said register marks with respect to said predetermined point,
a like plurality of voltage amplifying means connecting each said photodiode with a respective one of said relays,
a like plurality of and gates interposed between and connected with a respective one of said amplifying means and said relays, and
a cam connected with and driven by said press,
a normally open switch mounted on said press adjacent and closed by said cam during each performance of said press function; and,
a secondary electrical circuit connecting said normally open switch with each said and gate for energizing a respective one of said relays in response to a coincidence between a voltage generated by a closing of said normally open switch and a voltage generated by one of said photodiodes.