EP1086918B1 - Method and device for detecting a true product jam in a folding apparatus - Google Patents

Abstract

Procedure uses sensors (6, 7) for monitoring a conveyor belt that capture a sequence of folded copies along the transport path. The sensors include a transmitter and a receiver part. Only when both receiver parts detect a copy is a counter impulse (15) generated and sent to a paper blockage detector (12). An Independent claim is made for a device for detecting paper jams.

Description

JP-5-26382 discloses a device for detecting a paper jam in a folder known. In this solution from the prior art, a sensor is on a defined Positioned in the folder along the copy transport path and recognizes the presence of folded products transported in. If due to the results of the Detection of a paper jam at the defined location mentioned above, the rotary printing press be stopped. The solution presented here is a test mode provided, shutdown functions can be simulated, but the shutdown function, which stops the rotary press from being locked. So can be checked whether there is a need for paper jam detection in a rotary printing press downstream folder a safety shutdown works reliably or not.

JP-5-26381 discloses a device for detecting paper jams in a folder become known in which a sensor also a defined point along the fold copy transport path is arranged. The sensor detects the presence of transported Copies and puts a paper jam based on the detection results at the point in question where it is integrated in the transport path of the specimens. Care is taken that in the case where the sensor is connected to the main circuit is connected and in the case in which the sensor before the main circuit is separated, different signals are output when the power source is connected.

Finally, JP-5-26379 discloses another device for locating a paper jam in the folder. This is equipped with sensors, which are also at defined locations are arranged to detect the presence of transported specimens. Means are provided to decide whether, based on the results of the Detection by the sensors there is a paper jam at the relevant point or not. Furthermore, display devices are provided, which are based on the decision of the display a decision of a paper jam above. The display devices include the jam-maintaining memory that is present of a paper jam, only show the position on an ad where first a paper jam is indicated as present by the decision means mentioned above has been.

EP 0 933 321 A2 relates to a folder with an early warning system for detection of traffic jams and a process used for this. It is a folder and a process for processing a stream of printed material coming from a printing press Signatures are provided to prevent paper jams. The signatures move on a desired path with path edges and each signature has a leading edge and a trailing edge. The folder includes a variety of sets of sensors, which each determine whether the leading edge and / or the trailing edge of the signature of the Path edge deviates by more than a certain tolerance value.

In the case of copy-processing machines, for example a rotary printing press downstream folder, the jam detection is based on an evaluation of the Number of cutting cylinder revolutions and an evaluation by the sensor cells specimens seen and counted along the specimen transport path. Separated pieces of paper or pieces of copy move through the folder, the can be whirled around by air currents in the folder, they can Incorrectly suggest occurrence of a copy jam, although no copy jam is present. On the one hand, this can be caused by the fact that the paper scraps a sensor cell is covered in such a way that it passes through it in one unit of time Folded copies can no longer count reliably. In individual cases, pieces of paper are separated or snippets - which is less often the case - from the sensors within one Folders have been counted as full copies. A comparison of the counted copies with the actually through the pair of cutting cylinders from the incoming material web counted copies led to implausible statements.

In view of the outlined prior art, the invention is based on the object a sensor system for a folder that enables the correct display of a copy jam provide.

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

With the solution proposed according to the invention only in paper jam detection then a counting pulse is triggered when both sensors detect the presence of one to be transported Show folded copies. Scraps of paper or separated product parts recognized as such and generated when they come into the detection field of one of the sensors, no count at the paper jam detection. Falsely reporting a paper jam is now omitted; if one of the sensors of a pair of sensors fails, the rotation can still operate with minimal wiring changes, the paper jam detection is still active.

If the paper jam detection has inverting inputs to increase redundancy, a counting impulse is triggered at the paper jam detection whenever the Receiving parts of the sensors of the sensor pair no voltage is present. In this case, see both sensors a folded copy, this is recorded as such and counted accordingly. The sensor pairs are aligned along the specimen transport path so that they preferably detect marginal areas of the fold copies conveyed in rapid succession and are arranged off-center with respect to the specimen conveying path. For recognition of a paper jam, the number of revolutions of the Cutting cylinder pair continuously compared with the number of copies counted.

The sensors each consist of a transmitting and a receiving part, of which Transmitting part continuously emits radiation to the receiving part and the two sensors of the sensor pair are connected in parallel. The sensors are at a voltage level and contain electrical contact elements that, when both sensors fold copies detect, remain open and through inverted inputs on the paper jam detection trigger a counting pulse there. If a contact of one of the sensors of the sensor pair is closed, no count pulse is generated, the paper jam detection remains inactive.

The method according to the invention can be used in folders for both newspaper and use for commercial printing, be it on folders with puncture sets, as well as on Folders that work without a point.

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

Figur 1

eine aus dem Stand der Technik bekannte Sensoranordnung entlang des Exemplartransportpfads angeordnet,

Figur 2

die Randbereiche von Exemplaren parallel zueinander abtastende Sensoren,

Figur 3

Sende- und Empfangsteil einer Sensoranordnung, die mit einer Auswerteeinheit verbunden sind,

Figur 4

eine Sensoranordnung, bei der die Signalanzeige zweier Empfangsteile mit der Auswerteeinheit verbunden sind,

Figur 5

Kontaktzustände der Sensor- und Empfangsteile des Sensorpaares und

Figur 6

die schematische Konfiguration eines punkturlos arbeitenden Falzapparates mit im Exemplartransportpfad integrierten Sensorpaaren.

It shows:

Figure 1

a sensor arrangement known from the prior art is arranged along the specimen transport path,

Figure 2

sensors scanning the edge areas of specimens parallel to one another,

Figure 3

Transmitting and receiving part of a sensor arrangement, which are connected to an evaluation unit,

Figure 4

a sensor arrangement in which the signal display of two receiving parts is connected to the evaluation unit,

Figure 5

Contact states of the sensor and receiver parts of the sensor pair and

Figure 6

the schematic configuration of a pointless folder with sensor pairs integrated in the copy transport path.

1 shows a configuration known from the prior art shown.

Folded copies 4, 5 are conveyed in the copy transport direction 1. In relation to one A specimen transport path 2 in the center is provided with a sensor 3 counted copy 4 has happened, which is followed by a further folder 5, the still is to be counted. Whether the sensor arranged in the middle in relation to the specimen transport path 2 3 a folded copy or a part thereof, a section or scraps of paper as a copy detected, can not be said with certainty because there is no redundant verifiability of the signal determined by the sensor 3 is given.

The sensor 3 also generates a counting pulse when it is covered by pieces of paper becomes; the accumulation of counts and their Comparison regularly leads to the fact that the counted impulses the number of cutting cylinder revolutions, the separation of one fold copy from the incoming Display material web, exceeds it and is recognized on paper jam, although none is present.

The configuration according to FIG. 2 results in the arrangement of a pair of sensors containing sensors 6 and 7, which is assigned to the edge regions 8, 9 of the conveyed folding copies 4, 5, respectively. The sensors 6, 7 are acted upon in parallel and scan the specimen transport path 2 in the specimen transport direction 1 continuously and simultaneously. So that the sensor system recognizes a folded copy as such, both sensors 6, 7 must simultaneously recognize "paper", as a result of which corresponding signals for paper jam detection 12 are generated.
In the previous sensor arrangements according to FIG. 3, the sensor 3, which is arranged in the middle in the specimen transport path 2 and consists of the transmitting part 10 and the receiving part 11, was permanently acted upon via supply lines 13. Radiation 10.1 is exchanged between the transmitting part 10 and the receiving part 11, which indicates the detection of a folded copy or indicates the absence of a folded copy.

According to FIG. 4, the configuration according to the invention now comprises two parallel ones Sensors 6, 7. Along the specimen transport path 2 through a folder 23 (compare FIG. 6), the sensor pairs can be located at the critical points along the specimen transport path 2 are arranged, in particular on a pair of cutting cylinders 24 and at the transfer points of the cylinder holding the copy. A pair of sensors consisting from two edge areas 8, 9 of the folded copies 4, 5 each of the sensors 6, 7, is acted upon in parallel by a supply line 13. Each of the sensors 6, 7 is made up from a transmitting part 6.1 or 7.1 and a receiving part 6.2 or 7.2. Between the two False copies 4, 5 are detected via radiation exchange 10.1 non-contact way. Those of the receiving part 6.2 or 7.2 of the respective sensor 6, 7 generated output signals are combined and arrive as one of the summary corresponding input signal 15 to the paper jam detection 12. This will only by the signal summarized from the output signals of both receiving parts 6.2, 7.2 15 acted upon.

The paper jam detection 12 can either be provided with inverting inputs or be equipped with non-inverting inputs.

According to the different contact states of the sensors 6, 7 shown in FIG the functioning of the sensor pair described in more detail.

The sensors 6, 7 are connected to the level 0 V, reference number 18, and to one Voltage supply + V applied, identified by reference number 19.

The sensors 6, 7, in particular on the respective receiving part 6.2 or 7.2, contain electrical ones Contact elements 16, 17, each of an open or a closed state can accept. In state 20, both contacts 16 are open; the sensors 6, 7 both recognized the presence of a fold copy 4, 5. At the exits a corresponding signal is tapped from the receiving parts 6.2 and 7.2 of the sensors 6, 7. This signal is given to paper jam detection 12 as input signal 15. If their input is designed as an inverting input, then since the contacts 16 of both Sensors 6, 7 are open - therefore there is no output signal - due to the inversion A counting pulse is triggered at input 15 of paper jam detection 12.

If, according to the state 21, the contacts 17 in both sensors 6, 7 are closed, then - provided the inputs on the paper jam detection 12 are inverted - if there is one Output signal this inverted - a counting pulse in the paper jam detection 12 does not occur.

According to the state, which is identified by reference numeral 22, are on the sensors 6, 7 the contact elements 17 of a sensor 6 or 7, here the sensor 7, closed; however, those of the sensor 6 are open, so that after combining the output signals the sensors 6, 7 a positive output signal at the signal input 15 of the paper jam detection 12 is present. This inverted at the entrance of the paper jam detection 12 Signal in turn does not trigger a paper jam detection signal, since only one of the sensors 6, 7 on "paper" presence and the opposite sensor Not. Due to one of the sensors 6, 7 randomly covering pieces of paper or Another object is the triggering of an incorrect paper jam detection counteracted, which results in that with a shutdown of a roll rotation Allow significant accompanying circumstances to be avoided, in particular utilization and thus the productivity of the roll rotation can be kept at the highest level.

In addition to the discussion in connection with the various states in FIG. 5 of the inverting inputs of the paper jam detection 12 can be their inputs also switch positive. The further processing of the input signals 15 with positive wiring the paper jam detection 12 and the triggering of a counting pulse then accordingly.

Figure 6 shows the schematic representation of a pointless folding device. The folder 23 comprises a number of sensor pairs along the copy path 2 6, 7. In the illustration shown, in particular on the pair of cutting cylinders 24 Sensors 6, 7 arranged, and along the conveyor belt 25. At the exit point behind the conveyor belt 25 before the transfer of the copies 4, 5 to be folded a further pair of sensors 6, 7 is accommodated on the folding cylinder 26. On the scope of the paper Cylinder 26, the specimens in the direction of rotation 30 in the direction a transfer point to another paper-carrying cylinder 27, namely the folding jaw cylinder, promoted. In the gusset between the cylinders 26, 27 holding the copy can be - either above or below the copy transfer point - another Arrange sensor pair 6, 7 to monitor the copy transfer. A pair of sensors 6, 7 could also be at the transfer point between the jaw cylinder 27 and one Place transport cylinder 28 arranged above this.

From the number of revolutions of the pair of cutting cylinders 24, the number can be separated directly Folded copies 4, 5 are closed, it is irrelevant whether the pair of cutting cylinders 24 is carried out one or half speed. From the known sensor positions along the specimen transport path 2 for each of the positions of the sensors 6, 7 based on the number of copies comparisons determined in the paper jam detection 12, a reliable one Make a statement as to whether there is a copy jam in the folder 23 or not.

LIST OF REFERENCE NUMBERS

1

Copy transport direction

2

Copy transport path

3

sensor

4

counted copy

5

follow copy

6

first sensor

6.1

sending part

6.2

receive part

7

second sensor

7.1

sending part

7.2

receive part

8th

copy edge

9

copy edge

10

sending part

10.1

radiation

11

receive part

12

Paper jam detection

13

supply line

14

voltage level

15

input

16

open contact

17

closed contact

18

voltage level

19

power supply

20

open contact position

21

closed contact position

22

open single contact position

23

folding

24

cutting cylinder

25

Transportbänderzug

26

folding cylinder

27

jaw cylinder

28

transport cylinder

29

-

30

direction of rotation

Claims (9)

1. Method of detecting a jam of fold copies (4, 5) in a folder (23) having sensors (3; 10, 11) assigned to the copy transport path (2), the sensors (3; 10, 11) detecting the succession of fold copies (4, 5) along the copy transport path (2) and each consisting of a transmitting part (6.1, 7.1) and a receiving part (6.2, 7.2),
   characterized in that the presence of copies (4, 5) is detected by sensors (6, 7) connected in parallel and assigned to edge regions (8, 9) of the fold copies (4, 5), and upon a detection by both receiving parts (6.2, 7.2), triggers an input signal (15) at a paper jam detection device (12) so as to cause a counting pulse, and that an input signal (15) at the paper jam detection device (12) based on a voltage signal of only one of the receiving parts (6.2; 7.2), does not cause a counting pulse.
2. Method according to claim 1,
   characterized in that the paper jam detection device (12) has inverting inputs which trigger a counting pulse when no voltage is present at the receiving parts (6.2, 7.2).
3. Method according to claim 1,
   characterized in that the sensors (6, 7) continuously scan the edge regions (8, 9) of copies (4, 5).
4. Method according to claim 1,
   characterized in that a paper jam is detected in a folder (23) based on a comparison of the revolution of the cutting cylinder pair (24) and the number of copies (4, 5) passing sensors (6, 7).
5. Device for detecting a jam of fold copies (4, 5) in a folder (23) with sensors (3; 10, 11) assigned to the copy transport path (2), the sensors (3; 10, 11) detecting the succession of fold copies (4, 5) along the copy transport path (2) and each consisting of a transmitting part (6.1, 7.1) and a receiving part (6.2, 7.2),
   characterized in that sensors (6, 7) connected in parallel are assigned to edge regions (8, 9) of the fold copies (4, 5) to simultaneously scan the copy transport path (2) and generate an input signal (15) triggering a counting pulse when both receiving parts (6.2; 7.2) detect a fold copy (4, 5), and that at least one closed contact (17) at the receiving parts (6.2, 7.2) generates an input signal (15) that does not trigger the paper jam detection device (12).
6. Device according to claim 5,
   characterized in that a voltage level (14, 19) is applied to the sensors (6, 7) and that the sensors have an output (15) subjected to a voltage.
7. Device according to claim 5,
   characterized in that the outputs (15) subjected to a voltage are combined and generate an input signal (15) at the paper jam detection device (12).
8. Device according to claim 5,
   characterized in that the receiving parts (6.2, 7.2) include contact elements and that identical open contact positions (16) generate a counting pulse at a paper jam detection device (12).
9. Folder (23) having a copy transport path (2) along which the fold copies (4, 5) are transported in a continuous succession and which is assigned sensors (3; 10, 11), which comprise a transmitting part and a receiving part,
   characterized in that the folder comprises a device for detecting a jam of fold copies (4, 5) according to one or more of patent claims 5 to 8.

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