EP1069062B1 - Device for monitoring the transport of flat signatures - Google Patents

Abstract

The monitoring method uses a number of sensors (3-9) detecting the presence or absence of forms dependent on the selected operating mode of the folding machine (30), with sources (2a,14) detecting the number of forms handled by the folding machine, for comparison with the number of forms detected by the sensors. Also included are Independent claims for the following; (a) a form transport monitoring device; (b) a folding machine for a rotary printing press; (c) a rotary printing press

Description

The invention relates to a device for monitoring the transport flat copies, for example in a folder from a material web severed and there to be folded longitudinally and / or transversely.

EP 0847 857 A1 relates to an adjusting device in front of a cylinder a traverse arranged in a rotary printing machine. There is one on the traverse Measuring device displaceable axially to the lateral surface of the cylinder by means of a holder. For precise, uncomplicated and automatable adjustment of the truss alignment with respect to the cylinder with interchangeable adjustment direction Bracket can be coupled with an optoelectric adjustment aid. The adjustment aid has a light beam on the cylinder projecting optical element and at least one optical receiver, which is a reflected from the cylinder Beam of light receives. The optical receiver comprises an optoelectronic one Sensor that is used in conjunction with evaluation electronics to record the Position of the reflected light beam on the sensor is suitable.

This device is primarily used to align the surface of the cylinder scanning optical measuring device.

EP 0753 409 relates to a sheet-fed printing machine with a delivery the top of which continuously fed sheets are to be deposited. In easier and should not interfere with the stack formation be, with a traversing measuring device one at the front edge of the To scan sheets of applied pressure control strips. For that, they are on one Traverse moveable measuring device assigned to arch support which prevent that the sheet promoted during the execution of a measuring process on the Top of the stack.

With this device from the prior art, however, one of the No copies of the conveyance path covered - for example by a folder be reliably detected.

US 3,815,895 discloses a paper jam detection system for folders, one of which Role rotation are subordinate. Selected within the folder Locating photocells detect both absent and incorrectly also incorrectly existing copies along the conveyor path through the Folder. A timing control unit, which is synchronous to the folder works, generates signals that trigger detection when one is on a particular one The location of the expected copy is actually there and if one is on one Specimen not to be expected at a specific point on the conveyor path at this point actually does not arrive. The signals from the photocells will match those the timing control unit logically linked, supplied to a logic circuit, the stops the folder if necessary. The system also recognizes when in Paper jam detection system one of the photocells has failed.

DE 39 35 056 A1 has a process for controlling the sheet throughput in a folding machine Object. To control the sheet throughput in a folding machine, the Signals evaluated by sensors arranged on the sheet passage are. Each folder is one depending on the length of the folder prescribed Defines the number of sheets that are in the folder at the same time should. By evaluating at least the signals of an inlet-side sensor and the outlet side sensor of the folding unit determines the number of sheets that are in the folder. An error message is then issued if the number of sheets in the folder of which prescribed Number differs.

It has been found that not only at full operating speed Roll jams occurring in the folder drastic consequences and long Downtime can cause rotation, but that already during the Web feed or paper jams or paper misfeeds occurring when the rotation creeps at least avoidable delays when starting up the rotation can cause. During web threading or creeping the Very high torques can occur, mechanical adjustments of Grippers, cylinders or similar components in relation to each other can be undefined be while the printer's attention to others under one New establishment of an order may be directed to necessary work.

In view of the solutions outlined from the prior art and the recorded ones technical problem, the invention is based on the object To provide paper flow monitoring system, which at slow paper feed speeds responds to irregularities in specimen transport.

According to the invention, this object is achieved by the features of patent claim 1 solved.

The advantages that can be achieved with this solution are diverse. So you can using the method according to the invention folders integrate faster into the paper run when the upstream rotation creeps, because misdirected copies are immediately recognized in the folder and cause a shutdown of the folder drive. This provides effective protection mechanical folding components still undefined to each other represents the considerable creep speed under the high torques that occur there could be damaged. The printer can both at slow speed attention during rotation as well as during the paper threading phase dedicate necessary presets, an impending paper jam or a faulty line is now automatically recognized.

In a further embodiment of the method on which the invention is based Sensors in the folder depending on the selected folder mode based on the copy progression validated along the funding path. The validation, i.e. one on electronic Declaration of validity of a sensor signal can be made at the sensors located at the beginning of the specimen conveying path after just a few copies entered into the folder after the sensor in question Can detect the earliest at the earliest, depending on the preselected transport path set folding mode. Validation arranged earlier in the item transport path Sensors takes place after a lower number of copies that can be preset the validation of later sensors arranged in the specimen transport path corresponding to a larger number of copies entered in the folder the distance covered up to the validating sensor.

The limit values that enable validation are on the monitoring unit specifiable and stored there, so that they are always up to date for the necessary calculations be available.

By validating the sensors corresponding to the selected folding mode along the conveying path of the copies associated with the folding mode is the Reliability of those transmitted from the sensors to the monitoring unit Signals guaranteed. The determination of the number of copies in the Folding device has occurred, for example, is assigned to the cutting cylinder Revolution counter associated with the encoder or the drive motor of the folder. Depending on the section length selected, the individual in the Folders transported number of copies can be determined.

The difference is in the monitoring unit according to the present method of the number of copies detected per validated sensor and from the folder number of copies located is determined continuously, with a maximum permissible Difference can be specified on the monitoring unit. This can be dependent from the substrate parameters, copy thickness and empirical values to set the monitoring system according to the order.

In the sensors required to carry out the method according to the invention are sensor pairs that consist of a transmit and a Receiving part exist. These are spaced from each other, being between transmit and receiving part of the specimen conveying path runs. The cutting cylinder or the encoder associated with the drive of the folder can be used as a proximity switch or encoders such as rotary encoders can be configured, for example, per revolution a pulse to the monitoring unit of the unit concerned submit, which is summed up there.

Folders can preferably be monitored by means of the solution according to the invention, which are subordinate to a roll rotation, the monitoring unit each according to the copy path required for the selected folding mode Validated sensors and the sensor signals validated in this way for the number who compares the copies with the one that entered the folder. Out this comparison made in real time can be a shutdown condition in the Folder and / or derived for the entire rotation.

The invention is explained in detail below with reference to a drawing:

Fig. 1

dem prinzipiellen Aufbau eines Falzapparates mit dem jeweiligen Exemplarförderpfades zugeordneten Sensorpaaren,

Fig. 2

einen dem Doppelparallelfalzmodus entsprechende Exemplarförderung durch den Falzapparat,

Fig. 3

ein dem zweiten Längsfalzmodus entsprechender Exemplartransport durch den Falzapparat mit sich aufteilendem Exemplarstrom und

Fig. 4

ein prinzipielles, vereinfacht wiedergegebenes Flußschaltbild, welches die Arbeitsweise der Steuereinheit verdeutlicht

It shows:

Fig. 1

the basic structure of a folder with the sensor pairs assigned to the respective specimen conveying path,

Fig. 2

a copy conveyance by the folder corresponding to the double parallel folding mode,

Fig. 3

a copy transport corresponding to the second longitudinal folding mode through the folder with a dividing copy stream and

Fig. 4

a basic, simplified flow diagram, which illustrates the operation of the control unit

1 shows the basic structure of a folder with the respective copy conveying paths assigned sensor pairs shown.

A material web 15, which can also be formed from several material web layers, occurs after passage of a turning bar superstructure, not shown here a first longitudinal fold provided in the folder 30. Your presence is marked by a Sensor pair 1 detected, which consists of a transmitting and a receiving part 1a, or 1b exists. The material web 15 transported in the conveyor plane 16 passes through Cutting cylinder pair 2b, 17, consisting of a cutting cylinder 2b and one with this cooperating slot cylinder 17. There are the individual copies separated from the material web 15 by cross cutting.

An encoder 2a can optionally be assigned to the cutting cylinder 2b, which per revolution of the cutting cylinder 2b to the monitoring unit 12 transmitted. For each revolution of the cutting cylinder 2b, exactly one copy of the leading end of the web of material 15 separated, whereby the number of in Folder 30 located copies is easy to determine. The number of in the folder 30 entering copies can alternatively via a rotary encoder 14 are determined, the revolutions of the folder 30 driving Drive motor 13 detects what is also the number of in the folder has entered specimens determined. The values for the copies entering the folder are continuously determined and are stored in the monitoring unit 12.

The further promotion of the copies is now done by a folding knife cylinder 18 assigned sensor pair 3 monitors. Works with the folding knife cylinder 18 the jaw cylinder 19 together, working between them Cylinders 18, 19 of the first transverse fold is formed on the copy. The jaw cylinder 19 are two further transport or gripper cylinders 20, or 21 assigned, which on the one hand form a further transverse fold in the copy and, on the other hand, the copies of the circumference of the jaw cylinder 19 alternately decrease and in this way cause a distribution of the copy flow.

An upper conveyor path 22 extends behind the upper transport cylinder 20, secured by a pair of sensors 4 to the upper second longitudinal folding device 10b. In an analogous manner to this, the lower transport cylinder 21 is a lower conveying path 23 assigned, also secured by a pair of sensors 5, via which the copies can be fed to a further second longitudinal folding device 10a. The two second longitudinal folding devices 10a, 10b each contain a folding knife 27, which is not closer to the fold back on the copy by pushing in between here shown folding rollers. With the one located over the folding knife 27 Double circles the drive of the folding knife 27 is indicated in a simplified manner.

The upper second longitudinal fold module 10b is a paddle wheel configuration 25, 26 downstream, both for each paddle wheel 25 or 26 the entry of the specimens by means of a pair of sensors 6 or 7 as well as leaving the specimens of the paddle wheels 25, 26 can be monitored by means of sensor pairs 8 and 9, respectively. At the issue 11 the specimens laid out in shingled formation leave the folder 30 to a stacker or a packaging machine for further processing to become.

2 shows a copy conveyance corresponding to the double parallel folding mode through the folder.

The conveying path 28 indicates the transport path - shown here in greater line width to which the material web 15 through the cutting cylinder pair 2b, 17th accept separated copies in double parallel fold mode. In this operating mode of the folder 30, the copies are made by those working together Folding cylinders 18, 19 and 20 folded in parallel. The promotion the specimens take place along the upper conveyor path 22, the upper second Longitudinal folding device 10b is inactive and allows the cross-folded copies to pass through. These can then either in a lower paddle wheel 26 or an upper paddle wheel 25 are passed through which a scaled display of the specimens can be done. In this folding mode, according to a promotion of the copies of the conveying path 28, the sensor pairs 3, 4, 6, 7, 8, and 9 are in detection mode switched while the pair of sensors 5 on the lower conveyor path 23 such is to be switched that this has to detect the absence of specimens. Depending on selected delivery configuration for the copies in double parallel folding mode can one of the paddle wheels 25 or 26 or both paddle wheels can the product output take. With a copy output via the upper paddle wheel 25 sensors 7 and 8 must be switched to detection mode - according to the corresponding Validation while sensor pairs 6 and 9 indicate the absence of specimens would have to be set.

The sensors 7, 8 in the paddle wheel module of the folder 30 are validated in such a way that that they recognize a copy at the earliest and send a valid signal, if one of the distances from the cutting cylinder pair 2b, 17 to the respective Sensor corresponding number of copies is located in the folder 30. this applies analog for sensors 6 and 9, provided there is also a product delivery via the lower one Paddle wheel 25 is provided.

The validation of sensors 3, 4, 7, 8 and possibly 6 and 9 is dependent from the copy progression of the copies through the folder 30, so that the Signals from the sensors are only considered valid when the respective Depending on the folding mode, detect a sensor at the earliest or not can.

3 shows a specimen conveying path corresponding to the second longitudinal fall mode shown, with the copy flow divided behind the jaw cylinder.

In this operating mode of the folder 30, the copy conveying paths with 29 are marked, the copies are folded once tapped alternately behind the jaw cylinder 19 by the cylinders 20, 21 and get in via the lower and the upper conveyor paths 22, 23 in the upper and the lower second longitudinal folding device 10a, 10b. There are the cross-folded copies with a second longitudinal fold and arrive in a display not shown.

In this operating mode of the folder 30, the paddle wheel module is inactive, Accordingly, the sensors provided there are inactive, i. e. on detection the absence of copies switched; on the other hand, they are the funding path 29 of the sensor pairs 3, 4 and 5 assigned to the specimens upon detection of the presence of the copies switched, but on the condition that a validity of the specimens detected by the sensor pairs 3, 4 and 5 only from the time can take place from which the respective sensor pairs 1, 3, 4 and 5 at the earliest Recognize the copy according to the copy progression through the folder can.

In the configuration according to FIGS. 2 and 3, the number of folders 30 entering copies via encoder 2a or 14, the cutting cylinder 2b or assigned to the drive 13 of the folder 30 can be determined as above already spelled out.

The operation of the integrated in the folder 30 according to Figures 1 to The monitoring unit 12 shown in FIG. 3 can best be seen from the flow chart explain according to FIG. 4.

With the start command 100, the monitoring unit 12 is initialized first performs a self-test 101 and the printer activates it optically or also acoustically. According to the given Folder configuration becomes the set folding mode, for example double parallel folding 28 or second longitudinal fold mode 29 detected; this is done in step 102; depending on the selected folding mode 28 or 29, the sensor activation 103 those sensors 3, 4, 5, 6, 7, 8 or 9 activated on the selected folding mode 28 or 29 corresponding conveyance path of the copies through the folder 30 lie. These are stored in memory 104, which is an error detection routine 104.1 is assigned.

Are the relevant sensors from the number of sensors 3, 4, 5, 6, 7, 8 or 9 activated and stored, the number of copies is determined in the counting stage 105 has entered the folder 30.

The following part of the diagram between counter level 105 and the validation routine 106 is performed separately for each sensor 3, 4, 5, 6, 7, 8, or 9 since each these sensors by virtue of its different positions in the folder 30 has a different validation threshold. After exceeding the respective validation threshold, the point in time at which the selected sensor can detect an item at the earliest or can detect the absence of the specimen, the corresponding sensor signal only recognized as a valid sensor signal this is done by setting the sensors in 107th

A comparison operation 108 is then carried out using the sensors selected depending on the folding mode between the number of copies in the folder 30 and that on the respective Sensor detected number of copies performed. Results in the in Real time comparison operation 109 performed no difference, again becomes the signal validity request 106 branches to check if the validation threshold was actually exceeded or not.

If the comparison 109 shows that more copies were counted on the respective sensor, than may have entered the folder is done by setting the Shutdown signal 110 a stop of the folder 30 and / or the rotation as one Malfunction of the encoder 2a or 14 could be present.

On the other hand, the comparison operation 109 yields a smaller number of by Sensors 3, 4, 5, 6, 7, 8 or 9 detected copies than in the folder 30 have occurred, it is first determined via a sensor validity query 111, whether this result came from a previously validated sensor. if it if the sensor is not validated, it branches back to Validation query 106; the corresponding sensor was validated correctly, A paper jam 111.1 was detected, which was triggered by a shutdown command 112 switching off the drive 13 of the folder 30 and / or the rotation brings about.

When the command 113 is reached, the monitoring unit 112 has the monitoring run through the controlling program.

After the surveillance system has been initialized, this indicates to the printer that it is is activated at slow speed or during the web retraction phase. The system can to monitor himself, such that when a number of copies are found on a sensor that is larger than the one that actually entered the folder 30 Number of copies, the function monitoring of the encoder 2a or 14 is displayed becomes. The monitoring system can be used in any folder and is next to the specimen jam detection in slow speed or when entering the web also suitable for normal operating speeds and can be configured accordingly.

LIST OF REFERENCE NUMBERS

1

sensor pair

1a

sending part

1b

receive part

2a

revolution counter

2 B

cutting cylinder

3

Sensor pair of folding cylinders

4

Sensor pair upper conveyor path

5

Sensor pair lower conveyor path

6

Sensor pair 1st paddle wheel

7

Sensor pair 2nd paddle wheel

8th

Pair of sensors on top display

9

Lower delivery sensor pair

10a

lower second longitudinal folding device

10b

upper second longitudinal folding device

11

output

12

monitoring unit

13

drive

14

revolution counter

15

web

16

conveying plane

17

seem cylinder

18

folding blade

19

jaw cylinder

20

transport cylinder

22

upper funding path

23

lower conveyor path

24

paddle wheel

25

paddle wheel

26

fan pockets

27

Folding knife second longitudinal fold

28

Folder mode double parallel fold

29

Folder mode second longitudinal fold splintered

30

folding

100

begin

101

activation

102

Folder configuration detection

103

sensor activation

104

Ask to save

104.1

Memory error routine

105

copy counting

106

Signal validity query, validation

107

sensor activation

108

comparator

109

Defferentwertermittlung

110

Abschaltauslösung

111

Sensor valid query

111.1

Paper Jam

112

shutdown

113

The End

Claims (16)

1. A method of monitoring the transport of flat copies, in particular in a folder arranged downstream of a rotary printing machine, whereby selecting sensors (3, 4, 5, 6, 7, 8, 9) that initially detect the presence or absence of copies, depending on the folding mode (28, 29) of the folder (30) are chosen, with the following method steps:

   determining the number of copies that have entered the folder (30), by means of transmitters (2a, 14) during the creep speed or during a sheet-drawing phase and

   comparing the number of copies present in the folder (30) with the number of copies detected by the sensors (3, 4, 5, 6, 7, 8, 9), whereby sensor signals of the sensors (3, 4, 5, 6, 7, 8, and 9) depending on the folding mode (28, 29) of the folder are validated, i.e., declared to be valid on the basis of the copy progression, i.e., on the basis of the covered distance, in an electronic manner and whereby a validation is already carried out at the start of the transport of the copies through the folder (30) after a few copies have been delivered to the folder (30).
2. The method as claimed in claim 1, characterized in that a validation of sensors (6, 7, 8 and 9) placed further downstream along the delivery path is carried out after a large number of copies have been transported into the folder (30).
3. The method as claimed in claim 1, characterized in that the transmitter (2a) is assigned to a cylinder (2b), and the number of copies transported into the folder (30) can be determined by means of the transmitter (2a).
4. The method as claimed in claim 1, characterized in that the number of copies transported into the folder (30) is determined by means of a transmitter (14) assigned to the drive (13) of the folder (30).
5. The method as claimed in either of claims 3 or 4, characterized in that the number of copies determined is transmitted to a monitoring and evaluation unit (12).
6. The method as claimed in claim 1, characterized in that depending on the chosen folding mode (28, 29) of the folder (30) for each sensor (3, 4, 5, 6, 7, 8 or 9), the ratio between the number of copies that have entered the folder (30) and the number of copies respectively counted at the sensor position is determined.
7. The method as claimed in claim 1, characterized in that for each sensor position the maximum permissible difference between the number of copies that have entered the folder (30) and the number of copies that have actually occurred at the position of the sensor (3, 4, 5, 6, 7, 8 and 9) is determined.
8. The method as claimed in claim 1, characterized in that the validation of the respective sensors (3, 4, 5, 6, 7, 8 and 9) is carried out on the basis of reaching a minimum number of delivered copies at the respective position of the sensor (3, 4, 5, 6, 7, 8 and 9).
9. The method as claimed in claim 1, characterized in that the comparison (109) between the theoretical number of copies and the number of copies actually detected for each sensor position is carried out in real time.
10. Apparatus for implementing the method as claimed in claim 1, with sensors (3, 4, 5, 6, 7, 8 and 9) that are designed as pairs of sensors comprising a transmitting part and a receiving part (1a, 1b), and being disposed downstream and upstream of a pair of cutting cylinders (2b, 17), transport cylinders (20), longitudinal folding devices (10a, 10b) and the paddle-wheel configurations (25, 26) along the conveyor path of the copies, depending on the folding mode (28, 29) of the folder (30), characterized in that a monitoring unit (12) is provided in which the sensor signals of the sensors (3, 4, 5, 6, 7, 8, and 9) depending on the folding mode (28, 29) of the folder (30) are declared to be valid on the basis of the copy progression, i.e. the covered distance along the conveyor paths, in an electronic manner, and the number of copies that have entered the folder (30) during the creep speed or during a sheet-feed phase after a few copies have entered the folder by means of transmitters (2a, 14) is determined and that number is compared with the number of copies present in the folder which have been detected by means of the selected sensors (3, 4, 5, 6, 7, 8, and 9).
11. The apparatus as claimed in claim 10, characterized in that the receiving and transmitting parts of the sensors (3, 4, 5, 6, 7, 8 and 9) are arranged on either side of the delivery plane (16) of the material web (15) and of the copies.
12. The apparatus as claimed in claim 10, characterized in that the transmitter (2a) is designed as a proximity switch.
13. The apparatus as claimed in claim 10, characterized in that the transmitter (14) on the drive (13) of the folder (30) is designed as a rotary encoder.
14. The apparatus as claimed in claim 10, characterized in that the current folding mode (28, 29) of the folder (30) is determined by the position of the folding components on the paper-carrying cylinder (18, 19) and transmitted to the monitoring unit (12).
15. A folder for a rotary printing machine, in which material webs (15) can be processed, the folder (30) being capable of operation in at least two folding modes (28, 29) characterized by an apparatus according to claim 10.
16. A rotary printing machine for processing material webs (15), having a folder (30) that can be operated in at least two folding modes (28, 29), characterized by an apparatus according to claim 10.

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