EP0242622B1 - Überwachungssvorrichtung für die geschuppte Bogenzufuhr zu Druckmaschinen - Google Patents

Überwachungssvorrichtung für die geschuppte Bogenzufuhr zu Druckmaschinen Download PDF

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Publication number
EP0242622B1
EP0242622B1 EP87104393A EP87104393A EP0242622B1 EP 0242622 B1 EP0242622 B1 EP 0242622B1 EP 87104393 A EP87104393 A EP 87104393A EP 87104393 A EP87104393 A EP 87104393A EP 0242622 B1 EP0242622 B1 EP 0242622B1
Authority
EP
European Patent Office
Prior art keywords
sheet
scanning roller
roller
signal
sheets
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
Application number
EP87104393A
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German (de)
English (en)
French (fr)
Other versions
EP0242622A1 (de
Inventor
Anton Rodi
Dieter Uhrig
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
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Filing date
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Publication of EP0242622A1 publication Critical patent/EP0242622A1/de
Application granted granted Critical
Publication of EP0242622B1 publication Critical patent/EP0242622B1/de
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H11/00—Feed tables
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00—Feeding articles separated from piles; Feeding articles to machines
    • B65H5/24—Feeding articles in overlapping streams, i.e. by separation of articles from a pile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H7/00—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
    • B65H7/02—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors
    • B65H7/06—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors responsive to presence of faulty articles or incorrect separation or feed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H7/00—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
    • B65H7/20—Controlling associated apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/50—Auxiliary process performed during handling process
    • B65H2301/54—Auxiliary process performed during handling process for managing processing of handled material
    • B65H2301/541—Counting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/10—Size; Dimensions
    • B65H2511/11—Length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/10—Size; Dimensions
    • B65H2511/13—Thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/20—Location in space
    • B65H2511/21—Angle
    • B65H2511/212—Rotary position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/20—Location in space
    • B65H2511/22—Distance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/50—Occurence
    • B65H2511/51—Presence
    • B65H2511/514—Particular portion of element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/50—Occurence
    • B65H2511/52—Defective operating conditions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/50—Occurence
    • B65H2511/52—Defective operating conditions
    • B65H2511/522—Folds or misfolding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/50—Occurence
    • B65H2511/52—Defective operating conditions
    • B65H2511/524—Multiple articles, e.g. double feed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/13—Parts concerned of the handled material
    • B65H2701/131—Edges
    • B65H2701/1311—Edges leading edge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/13—Parts concerned of the handled material
    • B65H2701/131—Edges
    • B65H2701/1313—Edges trailing edge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/03—Image reproduction devices
    • B65H2801/21—Industrial-size printers, e.g. rotary printing press

Definitions

  • the invention relates to a monitoring device for the shingled sheet feed to a printing press, with which is rotatably mounted on a support above a base of the shingled sheets, the support being adjustable by an actuator such that the scanning roller is only rotated when a certain number of sheets are superimposed, and with a sensor interacting with the scanning roller.
  • an intermediate roller movable substantially perpendicular to the plane of the sheet transversely to its axial direction can be provided between the scanning roller and the base.
  • the scanning roller which does not come into direct contact with the sheet but is driven by a roller arranged between the sheet and the scanning roller, can be rotated to a limited extent.
  • a sensor detects when the scanning roller has traveled a predetermined angle of rotation and then emits a signal.
  • a spring is provided which pivots the scanning roller back into a basic position from the last-mentioned position. In the basic position, a contact is actuated by the scanning roller and thereby a control lamp is kept in the extinguished state.
  • the scanning roller and the intermediate roller are mounted on a carrier.
  • the height of the carrier and thus the height of the intermediate roller above the base of the sheet, a driven roller can be adjusted by an electric motor to be switched by an operator.
  • the setting is made so that e.g. in the case of two sheets lying one above the other, the intermediate roller does not touch the scanning roller, whereby this remains in the basic position, but in the case of three sheets the intermediate roller rotates the scanning roller against the force of the spring.
  • the indicator lamp lights up. At the end of the triple overlap, the indicator lamp goes out again. This enables the operator to check the correct setting of the monitoring device and, if necessary, to bring about a correct setting by switching on the electric motor. If the overlap is too long, if there is a multiple sheet, the sensor responds and triggers an error signal.
  • the length of the overlap region, in which the sensor has not yet triggered is predetermined by the size of the pivoting angle of the scanning roller until the sensor is triggered and cannot be changed or can only be changed with difficulty.
  • the setting of the monitoring device requires increased attention.
  • the motor which adjusts the height of the carrier is then subjected to a drive pulse which increases the distance of the scanning roller from the base of the paper when the scanning roller rotates, it being assumed that the motor should only be switched on , if the number of overlapping sheets leading to twisting is smaller than intended.
  • this process must be monitored by the operator.
  • the scanning roller of the known machine After a permissible overlap has occurred, the scanning roller of the known machine requires a certain time to return to its basic position. So that the scanning roller can follow short distances between the overlaps, a strong restoring force must be generated for the scanning roller and, accordingly, a sufficiently strongly pre-tensioned spring must be provided. Tensioning this spring during an overlap brakes the sheets and can affect sheet transport and damage the surface of the sheets, especially if they are already printed.
  • the invention has for its object to provide a monitoring device of the type described that is easy to handle. This object is achieved according to the invention with the combination of the features of claim 1.
  • Such monitoring is possible because the signal characteristic of the angle of rotation can be used to determine whether the leading edge of a sheet actually arrives at the point in time at which it must arrive at the scanning roller or whether the leading edge of a sheet is absent or closed at this point in time arrives at other times.
  • the device for measuring the distance of the scanning roller from the support enables the thickness of the sheet running under the scanning roller to be determined quickly, and this information can be used for further monitoring of the scale build-up.
  • DE-OS 29 30 270 a control device for the supply of sheets, with which irregularities in the sheet feed are to be detected, in which device a displacement sensor is provided, by means of which the distance between two rolls, the thickness of a between sheets lying between the rolls, can be measured.
  • the roller coupled to the displacement sensor is always pressed against the other roller by a spring, as a result of which particularly sensitive sheets can be impaired in their surface quality.
  • the role coupled to the position encoder is not used to determine the length of the overlap area.
  • the invention comprises two closely related embodiments, in which in one embodiment the scanning roller interacts directly with the sheet, and in the other embodiment, as in the prior art mentioned at the outset, the scanning roller by a pair roller is rotated when the intermediate roller is lifted and rotated by sheets passing under it.
  • Another advantage of the device according to the invention without an intermediate roller is that the device can be adjusted so that the scanning roller is not in contact with the sheet during trouble-free sheet transport. Only when there are too many sheets lying on top of each other does the scanning roller come into contact with the top sheet, is rotated by it, and the sensor reports this and emits an error signal.
  • the maximum number of overlapping sheets depends on the sheet length.
  • the number of the maximum overlapping sheets can be entered into the control device by the operator, or the sheet length can be entered, and the device determines the number of the maximum overlapping sheets.
  • control device is designed such that it automatically determines the arc length. This is done by detecting a decrease in the total thickness of the sheets lying one above the other and thereby determining the rear edge of a sheet. This embodiment makes it possible for the device to determine the number of sheets that are permissibly overlapping each other completely automatically.
  • the adjustment of the scanning roller or intermediate roller to such a height that the sheet only the role that comes into direct contact with them, namely the scanning roller or intermediate roller touch where a predetermined number of sheets overlap can be made automatically and quickly.
  • the setting is advantageously carried out such that the height of the scanning roller or intermediate roller, i.e. the smallest distance of the scanning roller or intermediate roller from the base, which will generally be a driven roller, is less than one sheet thickness greater than the total thickness of the sheets which are permissibly overlapping.
  • control device is designed such that when the first sheet passes under the scanning roller or intermediate roller, it determines the thickness of the sheet by adjusting the height of the support and adjusts the scanning roller or intermediate roller to a height which is greater than the thickness of a single sheet, but less than twice the sheet thickness.
  • the control device causes the scanning roller or intermediate roller to be set to a height which is greater than twice the sheet thickness, but smaller than three times the sheet thickness, and so on away.
  • control device is designed in such a way that, while the sensor signal indicating the rotation of the scanning roller is present, it evaluates the signal which is characteristic of the angle of rotation of the printing press, in order thereby to determine the length of the overlap region.
  • a force generating device which loads the scanning roller with a force which can be set by the control device. While in the prior art, for example in the last-mentioned publication, the force with which the scanning roller rests on the top of the sheet is predetermined by a spring and can only be adjusted by hand, the embodiment described thus makes it possible to set the force automatically .
  • the sheet thickness can serve as a measure for this, possibly together with an indication of the paper type.
  • the force to be set can be specified in a memory of the control device. As far as the paper thickness determines the force, the control device, which automatically detects the paper thickness, can automatically set the force itself. The force can be adjusted largely independently of the position of the scanning roller if necessary.
  • an electric motor is provided as the force generating device.
  • the control device compares the signal supplied by the sensor and the signal which is characteristic of the angle of rotation of the machine and emits a fault signal in the event of deviations which exceed a predetermined amount. While the invention described at the outset does not require precise detection of the angle of rotation of the scanning roller because only the fact of a rotary movement of the scanning roller has to be ascertained, it is provided in accordance with this embodiment that the scanning roller emits a signal which is characteristic of the angle of rotation of the scanning roller and which provides conclusions to the length of the overlap area. This signal is compared with the signal which is characteristic of the angle of rotation of the machine, which is preferably a clock signal and whose clock frequency is a measure of the transport speed of the sheets. For example, if there are inadmissible deviations between the rotation angle of the scanning roller (or the time during which the scanning roller rotates) and the signal dependent on the machine cycle, as a result of a blocking of the scanning roller, this is recognized.
  • a part of a printing press 1 is shown schematically, which are fed from a stack 3 by a sheet feeder 2 overlapping sheets of paper.
  • the partially overlapping sheets pass through a scanning device 4 and reach the printing press 1 via a feed table 5.
  • a clock generator 6 is connected to a gearwheel of the printing press 1, which rotates one full rotation with each press that corresponds to a single printing process.
  • This is only shown schematically and has a reticle with 1024 marks in the example.
  • the rotation of the reticle is sensed by a light barrier that generates a clock signal corresponding to the rotation of the reticle.
  • the instantaneous angle of rotation of the printing press 1 can be determined from the clock signal.
  • a guide rail 8 (FIG. 2) arranged above the feed table 5 ensures that the paper sheets cannot get too far up.
  • the scanning device 4 is shown in FIG. 2 in a side view.
  • a rotatingly driven transport roller 9 projects into a recess in the feed table 5 and in FIG. 2 conveys paper sheets coming from the right to the left.
  • a multi-armed lever 11 is pivotally mounted on a shaft 12 on a machine-fixed part 10. The end of the lever 11 pointing to the left in FIG. 2 carries a scanning trellis 13 which bears a line marking 15 which can be scanned by a sensor 14 attached to the lever 11 and which forms an incremental encoder together with the sensor.
  • the sensor 14 is in a position when the scanning roller 13 rotates. In one embodiment of the invention, the sensor 14, together with further devices, is also able to determine the angle of rotation of the scanning roller 13.
  • a rod 18 is articulated, which carries a thread.
  • a sleeve 26 is screwed, which merges into a widening 27, which forms a stop for the movement of another arm 28 of the lever 11 to the left in FIG. 2.
  • the sleeve 26 is connected to the shaft of a motor 22 designed as a DC motor.
  • the current is supplied via lines 23.
  • a potentiometer 20 is fastened to the housing 24 of the motor on the left-hand side of the motor 22 in FIG. 2.
  • the shaft of the motor 22 is connected to the wiper of the potentiometer 20, and the connecting line of the potentiometer 20 connected to the wiper is provided with the reference number 21.
  • the housing 24 of the motor is secured against rotation in a manner not shown by a projection of the housing which engages in a slot in a machine-fixed part.
  • the motor 22 can therefore rotate the sleeve 26, whereby the total length of the rod 18 and sleeve 26 is increased or decreased depending on the direction of rotation of the motor 22, so that the distance of the stop from the projection 17 can be changed.
  • the clear distance 30 between the transport roller 9 and the scanning roller 13 can be changed if it is not raised by sheets.
  • the embodiment of a scanning device shown in FIG. 3 differs from the example shown in FIG. 2 essentially in that the scanning roller 13 cannot come into direct contact with the top of the paper sheets, but in that one between the scanning roller 13 and the transport roller 9 Intermediate roller 40 is arranged, the weight of which is borne by a tension spring 42 which is anchored to the lever carrying the scanning roller 13.
  • the scanning roller 13 is only rotated when the intermediate roller 40 has been moved so far away from the transport roller 9 by paper sheets that it touches the scanning roller 13.
  • the lowest possible position of the scanning roller 13 and thus (taking into account the properties of the tension spring 42) of the intermediate roller 40 can be predetermined by the adjustment of the sleeve 26, and by the current supplied to the further motor 32, as long as the lowermost mentioned above Position is not reached, the force can be set with which the intermediate roller 40 presses on the paper sheet.
  • FIG. 4 shows the block diagram of a monitoring device according to the invention, the Vor 2 contains.
  • a microcomputer 51 for example an Intel SBC86 / 12, is connected via a bus system 70 to a machine control device 50, by means of which the printing press 1 can be controlled. The connection described enables data exchange between the machine control 50 and the device for monitoring the sheet feed.
  • the clock generator 6 (cf. FIG. 1) on the printing press 1 supplies a machine clock signal to the microcomputer 51 on a line 78, which can calculate path lengths in connection with a signal appearing on an output line 71 of the sensor 14 and process them further.
  • the required pressing force, which is generated by the further motor 32, is calculated by the microcomputer 51 on the basis of the thickness of the individual paper sheets determined by means of the potentiometer 20 and is passed on to a digital / analog converter 59 in the form of a digital setpoint on a line 75.
  • a motor current control 60 generates a motor current proportional to an analog setpoint value 76 appearing at its output and supplies it to the further motor 32.
  • the motor current is kept constant by means of a negative feedback.
  • the analog value proportional to the distance 30 (FIG. 2), which is supplied by the potentiometer 20 via its line 21 connected to the slider, is first fed to an analog / digital converter 54, the output signal of which is fed to the microcomputer 51 via a line 72.
  • the distance 30 is set by the motor 22, to which the required current is supplied via a driver stage 56.
  • the driver stage 56 can be controlled both manually via a button 57 and also automatically via an output signal of the microcomputer 51 supplied on a line 73.
  • a display 58 which works with light-emitting diodes and is controlled by the microcomputer 51, shows the operator the correct sheet overlap and any missing or multiple sheets that may occur.
  • the operating mode of the monitoring device can be set via a symbolically represented switch 53 which can be operated manually.
  • the determination of the length of the named variables on the basis of the number of pulses of the signal emitted by the clock generator 6 is independent of the speed.
  • the machine control 50 contains the length information for adjusting format-dependent devices on the printing press via the bus system 70.
  • the scanning roller 13 is not as friction-free as possible, but with some friction so that it comes to a standstill quickly after the contact with the sheets has ended. So that the acceleration of the scanning roller 13 from standstill does not cause any damage to the surface of the paper sheets, the scanning roller 13 is constructed with a very low weight and moment of inertia and is essentially formed by a light plastic wheel.
  • FIG. 6 explains how the monitoring device (with the scanning device shown in FIG. 2) carries out the setting process.
  • the printing press When the printing press is started, it is first checked on the basis of information available in the memory of the machine control 50 whether a re-adjustment of the sensing roller 13 is necessary. This is the case, for example, if, after an error, the overlapping sheets supplied by the sheet feeder have been cleared away and the build-up of a shingled sheet feeder must therefore be monitored again. If no readjustment is necessary, the sheet monitoring is carried out continued from the point where it was interrupted.
  • diagram 100 shows the arrangement of overlapping sheets B, one having to imagine these sheets as running from right to left in FIG. 6.
  • Diagram 101 shows the course of the total thickness of the sheets with a dashed line, similar to curve 81 in FIG. 5.
  • the solid line shows the height setting of the scanning roller 13 in the sheet feed monitoring with length determination, and in diagram 102 one pure multiple sheet control.
  • the thickness curve of the sheet is again drawn in with a dashed line in the same way as in diagram 101.
  • the time axis runs from left to right in FIG. 6.
  • the feeler roller 13 is moved by means of the lever 11 and the motor 22 from a basic position, which is present at the time P1, in which it is lifted off the rotating transport roller 9, to the transport roller 9.
  • the sensor 14 emits signals which indicate the rotation of the feeler roller 13, it has touched the transport roller 9. This is the case at time P2.
  • the voltage value supplied by the potentiometer 20 on the line 21 is now stored in the microcomputer 51 and assigned to the value O for the distance 30 there.
  • the scanning roller 13 is lifted again so far from the transport roller 9 by switching on the motor 22 that it stops and therefore the sensor 14 no longer emits any signals; this is the case at time P3.
  • the processes described so far have been completed before the first sheet reaches the scanning roller 13.
  • the arrival of the leading edge of the first sheet rotates the scanning roller 13 and the sensor 14 emits signals.
  • the front edge of the first sheet (or the time P4) must occur within a predetermined machine angle (rotational position of the machine part driving the clock generator 6); if this is not the case, the monitoring device reports that a sheet is missing (missing sheet).
  • the scanning roller 13 is raised further, until the sensor 14 no longer emits a signal; this is the case at time P5. Now the signal supplied by the potentiometer 20 at this time is read by the microcomputer 51 and stored.
  • the microcomputer 51 determines the sheet thickness d and now uses a stored table to determine the pressing force with which the motor 32 pushes the lever 11 counterclockwise in the illustration in FIG. 2, should press against the bow or against the stop 27, and the associated motor current.
  • a new distance 30 is calculated, which is slightly smaller than twice the sheet thickness 2d, and this new distance is set. This process is completed at time P6.
  • the distance mentioned which corresponds to the simple sheet thickness d plus a tolerance Td (less than d), is selected so that, on the one hand, irregularities in the printing material (paper sheet) do not lead to the scanning roller 13 rotating, but on the other hand the starting edge of the next sheet at the time P7 is clearly recognized.
  • the microcomputer 51 checks again whether the start edge of the next sheet arrives at a time P7 within a permissible machine angle range; Thereafter, the scanning roller 13 is raised by the control of the microcomputer 51 by the amount of a sheet thickness d. This process is completed shortly after time P7.
  • a memory location in the microcomputer 51 is increased by the amount 1, so that the number n of sheets lying one above the other at a certain time is also known.
  • the operating mode preselected by the operator namely either a multiple sheet control (illustration 102) or the sheet feed monitoring with sheet length measurement (illustration 101) is first determined by the microcomputer 51, and then the adjustment of the intermediate space 30 during the sequence according to representation 101 to (n-1) xd + Td at time P9 or in the representation 102 to the value nxd + Td.
  • the transport path of the sheets between the times P7 and P8 corresponds to the constant length S2 in FIG. 5, which is predetermined by the type of sheet feeder 2.
  • the device recognizes that there is again only a double overlap.
  • the time P9 is a very short time after the time P8.
  • the scanning roller 13 thus comes into contact with the upper side of the scaled sheets a very short time after the front edge of the third sheet B has reached it in FIG. 6 and is rotated.
  • the rotation stops at time P10 because the overlap of two sheets ends here.
  • the control device can now calculate the arc length from the advance of the arc between the times P8 and P10 0 measured overlap length. If it is not possible to lower the scanning roller 13 quickly enough after the time P8, the overlap following the time P10 is expediently used to measure the length of the overlap.
  • the arc length can be determined continuously by the device.
  • the sheet length control (illustration 101) cannot calculate the sheet length at time P10, but only at a later time.
  • the arc length can thus be determined after the point in time at which the maximum number of overlaps occurs.
  • the quantities Si, S2, S3, n shown and described in FIG. 5 are continuously measured or calculated. Since the signal output of the sensor 14 on the feeler roller 13 is influenced both in the case of missing sheets and in the case of multiple sheets and extreme sheet displacements which impair the function of the printing press, these errors are reliably detected and reported. Each time two sheets overlap, the scanning roller 13 is rotated in this operating mode.
  • the operator is signaled a missing sheet by means of the light-emitting diode display 58 and, if this message is forwarded to the machine control system 50, an interruption in the sheet supply is effected.
  • the sheets already on the feed table 5 are then printed and the printing is then stopped.
  • the error message is canceled by a start command from the operator and the build-up of the scaled sheet feed is monitored again, as described above.
  • Too much conveyed sheets are also visually displayed and reported to the machine control 50.
  • the defective point in the sheet stream i.e. in the successive sheets, is now transported further after the sheet feeder has been parked until the multiple sheet has reached an easily accessible point for the operator and the machine has just finished printing.
  • the printing process is then set by the machine and the excess sheet fed can be easily removed by the operator. After starting the printing machine, the structure of the shingled sheet feed is checked again.
  • the sensor 14 is no signal from .. because the cam follower 13 also does not come within the range of overlaps with the sheet in contact. Therefore, by monitoring a rotation of the scanning roller 13 on the basis of the output signal from the sensor 14, only too much conveyed sheets and long folds in the printing medium which impair the function of the printing machine are recognized when these folds cause the scanning roller 13 to rotate as well.
  • the device Shortly after time P10, i.e. When the rear edge of the second sheet in FIG. 6 is recognized, the device has for the first time ascertained all the data which are necessary for the described functional sequences of the device for sheet feed monitoring with sheet length measurement (illustration 101).
  • the device has determined all the data necessary for the functional sequences required shortly before the point in time P8, where it is recognized from the absence of an increase in thickness that only two overlaps occur.
  • the microcomputer 51 knows how many pulses of the signal supplied by the clock generator 6 occur until a sheet placed by the sheet feeder arrives at the scanning roller 13. If the sheet feeder is switched off while the printing machine 1 is running, but the sheets present on the feed table 5 are still to be printed, the total thickness of the sheets passing under the scanning roller 13 gradually decreases. So that this degradation of the shingled sheet supply can also be reliably monitored, the scanning roller 13 is used by the microcomputer 51 when - due to a switch-off signal from the sheet feeder whose standstill is known to the microcomputer 51 - the scanning roller shortly after the trailing edge of a sheet passes by one Lowered sheet thickness. If the sheets are still properly positioned and fed, the scanning roller 13 is not rotated.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Controlling Sheets Or Webs (AREA)
EP87104393A 1986-04-24 1987-03-25 Überwachungssvorrichtung für die geschuppte Bogenzufuhr zu Druckmaschinen Expired - Lifetime EP0242622B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3613969 1986-04-24
DE19863613969 DE3613969A1 (de) 1986-04-24 1986-04-24 Ueberwachungsvorrichtung fuer die geschuppte bogenzufuhr zu druckmaschinen

Publications (2)

Publication Number Publication Date
EP0242622A1 EP0242622A1 (de) 1987-10-28
EP0242622B1 true EP0242622B1 (de) 1990-10-03

Family

ID=6299482

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Application Number Title Priority Date Filing Date
EP87104393A Expired - Lifetime EP0242622B1 (de) 1986-04-24 1987-03-25 Überwachungssvorrichtung für die geschuppte Bogenzufuhr zu Druckmaschinen

Country Status (5)

Country Link
US (1) US4753433A (enrdf_load_stackoverflow)
EP (1) EP0242622B1 (enrdf_load_stackoverflow)
JP (1) JPS62269833A (enrdf_load_stackoverflow)
CA (1) CA1283427C (enrdf_load_stackoverflow)
DE (2) DE3613969A1 (enrdf_load_stackoverflow)

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DE4210958A1 (de) * 1992-04-02 1993-10-07 Heidelberger Druckmasch Ag Einrichtung zur Messung der Bogenlänge beim Transport von Bogen durch eine Druckmaschine
DE4318220C3 (de) * 1993-06-01 1999-10-21 Koenig & Bauer Ag Vorrichtung zur Bogenlängenerkennung
DE10033638A1 (de) * 2000-07-11 2002-01-24 Heidelberger Druckmasch Ag Überwachungsvorrichtung für die Bogenzufuhr zu einer Bogen verarbeitenden Maschine und Verfahren zur Kontrolle des Bogenstromaufbaus des Bogenstroms

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GB2215710B (en) * 1988-03-23 1992-04-15 Unisys Corp Multiple document detector and separator
US5129642A (en) * 1988-06-02 1992-07-14 Bell & Howell Company Controllable document drive and separation system
US5098078A (en) * 1989-04-17 1992-03-24 Omron Corporation Continuous paper let-out apparatus
US4903600A (en) * 1989-04-24 1990-02-27 Long John A Product collator imbricator and printer
US4979730A (en) * 1989-11-14 1990-12-25 Pitney Bowes Inc. Sheet drive system having an encoder apparatus
US5249795A (en) * 1990-03-07 1993-10-05 Canon Kabushiki Kaisha Sheet feeding apparatus
US5143366A (en) * 1990-09-07 1992-09-01 Bell & Howell Company Mail feeder
JPH0790506B2 (ja) * 1991-08-26 1995-10-04 株式会社島精機製作所 裁断機における被裁断材の異常検出装置
ATE134973T1 (de) * 1992-02-19 1996-03-15 Ferag Ag Doppelbogenerkennung
US5224695A (en) * 1992-04-21 1993-07-06 Bell & Howell Company Method and apparatus for feeding documents
JP3119754B2 (ja) * 1992-12-24 2000-12-25 キヤノン株式会社 記録装置
DE4331610A1 (de) * 1993-09-17 1995-03-23 Roland Man Druckmasch Bogenanlegereinheit
FR2729751A1 (fr) * 1995-01-20 1996-07-26 Perto Sa Dispositif et mesure numerique de l'epaisseur de feuilles
DE19505560C2 (de) * 1995-02-18 1998-07-02 Roland Man Druckmasch Verfahren zum Steuern der Bogenzufuhr
US6000693A (en) * 1995-12-05 1999-12-14 Unisys Corporation Article detection via pinch-roll motion
GB9701794D0 (en) * 1997-01-29 1997-03-19 Owens Mark Adaptation to the Heidelberg electro mechanical double sheet detector
DE19962116A1 (de) * 1999-12-21 2001-06-28 Heidelberger Druckmasch Ag Leitvorrichtung zum Führen von Bogen und Verfahren zum Betreiben einer Leitvorrichtung
US7387236B2 (en) * 2001-10-09 2008-06-17 Delaware Capital Formation, Inc. Dispensing of currency
US20050098622A1 (en) * 2001-10-09 2005-05-12 Gregory Jantsch Dispensing of currency
US7182339B2 (en) * 2002-01-09 2007-02-27 Lockheed Martin Corporation Thickness measuring system, having improved software, for use within a mail handling system, and method of using same
US7976007B2 (en) * 2005-05-19 2011-07-12 Pitney Bowes Inc. Multiple sheet feed performance enhancing system
US20070001383A1 (en) * 2005-06-20 2007-01-04 Gregory Jantsch Dispensing of currency
JP4714595B2 (ja) * 2006-01-31 2011-06-29 リョービ株式会社 重畳検知装置
US20080265499A1 (en) * 2007-04-27 2008-10-30 Kabushiki Kaisha Toshiba Image forming apparatus
DE102007061396A1 (de) * 2007-12-19 2009-06-25 Koenig & Bauer Aktiengesellschaft Vorrichtung zur Verhinderung des Einlaufens von Überschießbogen in eine Bogendruckmaschine
JP5327634B2 (ja) * 2009-11-02 2013-10-30 株式会社リコー 回転測定装置、シート搬送装置、原稿読取装置、及び画像形成装置
JP2012121667A (ja) * 2010-12-07 2012-06-28 Fuji Xerox Co Ltd 画像形成装置及び長さ測定装置
DE102015201325A1 (de) * 2014-02-21 2015-08-27 Heidelberger Druckmaschinen Ag Verfahren und Vorrichtung zum Niederhalten eines Bogens auf dem Zuführtisch einer Bogen verarbeitenden Maschine
DE102015209905B4 (de) * 2015-05-29 2020-01-02 Koenig & Bauer Ag Kontrolleinrichtung zum Überwachen eines Grenzwerts einer Schichtdicke und/oder einer Anzahl von mehreren zumindest teilweise aufeinander liegenden Materialabschnitten in einem Fühlspalt
TWM595046U (zh) * 2020-02-25 2020-05-11 崴強科技股份有限公司 自動調整設定的分紙機構

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CH660350A5 (de) * 1983-06-14 1987-04-15 Ferag Ag Einrichtung zum feststellen mehrfach belegter plaetze in einem kontinuierlich gefoerderten strom von gleichmaessige abstaende voneinander aufweisenden druckprodukten sowie verwendung dieser einrichtung.

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4210958A1 (de) * 1992-04-02 1993-10-07 Heidelberger Druckmasch Ag Einrichtung zur Messung der Bogenlänge beim Transport von Bogen durch eine Druckmaschine
DE4318220C3 (de) * 1993-06-01 1999-10-21 Koenig & Bauer Ag Vorrichtung zur Bogenlängenerkennung
DE10033638A1 (de) * 2000-07-11 2002-01-24 Heidelberger Druckmasch Ag Überwachungsvorrichtung für die Bogenzufuhr zu einer Bogen verarbeitenden Maschine und Verfahren zur Kontrolle des Bogenstromaufbaus des Bogenstroms

Also Published As

Publication number Publication date
DE3613969A1 (de) 1987-10-29
EP0242622A1 (de) 1987-10-28
DE3765287D1 (de) 1990-11-08
DE3613969C2 (enrdf_load_stackoverflow) 1989-10-05
JPS62269833A (ja) 1987-11-24
CA1283427C (en) 1991-04-23
US4753433A (en) 1988-06-28

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