DE10033490B4 - Device for laterally aligning bows - Google Patents

Abstract

Device for laterally aligning sheets, consisting of a pile support plate (6) carrying a sheet stack (9) with an adjusting device (11) for laterally displacing same, further comprising means (4, 10) for singulating and conveying the sheets in a transport direction ( 12) to a feed table (5) having an electronic side mark (30) for detecting the lateral position of the sheets (8), wherein the electronic side mark (30) is connected to an evaluation / control unit (25) such that in the evaluation / control unit (25) via a target / actual comparison control signals for the feed table (5) subordinate gripper systems for lateral displacement of the sheet (8) and control signals for the adjusting device (11) of the stack support plate (6) can be generated, wherein Determining the required adjustment of the stack support plate (6) on the formation of an average value of the positional deviations over several sheets to be aligned (22) a positional deviation tendency he is indirect.

Description

The invention relates to a device for laterally aligning sheets which are separated from a stack of sheets arranged in a sheet feeder on a stackable pallet which can be moved by an adjusting device acting on the stack support plate, in a transport direction via a belt table to a feed table promoted and arranged with the help of a in the feed table perpendicular to the transport direction, a side stop and the respective sheet to be aligned against this leading drawing device having side mark or using an electronic page mark after the side edge aligned by the position of the side edge of the electronic page mark detected and be generated by a target-actual comparison signals that are used to adjust the gripper systems perpendicular to the sheet travel direction, which aligned in each case after the leading edge sheet in e transport a downstream machine.

It is common practice to align the sheets separated by a sheet stack in a sheet feeder and fed to a feed table via a belt table by means of a side mark arranged in the feed table. The page marks are slidably mounted in the feed table perpendicular to the sheet transport direction for adapting the format and have a side stop and a bow to be aligned each detected and leading with the side edge against the side stop pulling device. The pulling device consists of a pulling belt which can be moved transversely to the transport direction in the machine cycle and which detects the sheet to be aligned by friction or underpressure and transports it to the side stop (FIG. DE 195 01 798 A1 . 44 15 494 C2 ). With these page marks, it is necessary to feed the sheets to be aligned in their lateral position within a narrow tolerance range. Since the sheet feeder supplied stack usually have a significant offset, it is from the DE 28 08 774 C2 It is known to provide a sheet scanning device in the sheet feeder which, in the event of deviations from the desired position of the stack, actuates an adjusting device which shifts the stacking plate and thus the stack transversely to the transport direction.

From the DE 195 24 891 A1 Furthermore, a device for laterally aligning sheets by means of an electronic page mark is known. The sheets separated in a sheet feeder are conveyed to the front marks positioned on a feed table and are thus aligned with the sheet leading edge. An electronic page mark captures at least the actual position of a sheet side edge and outputs these measured values to a desired-actual comparison to a controller. The pulses generated by the target-actual comparison are supplied to actuators which act on gripper systems, which are assigned in the axial direction displaceable to a sheet accelerating device. By moving the gripper systems, the sheets are brought to the side position in the desired position.

The disadvantage is that in a format change both the means for controlling the position of the sheet stack and the side mark must be coordinated with each other, which can not be ruled out that in machine operation, the tolerance range of the side mark exceeded and thus the effectiveness of the system is impaired. In addition, the disadvantage of such devices is that the sheet stack is scanned at a distance from each to be separated sheet. As a result, parking operations can be initiated, although the sheet to be separated is positioned correctly, so that it is conveyed outside the work area of the page mark on the feed table.

From the DE 34 33 994 A 1, a solution is known in which a position of the sheet detecting measuring device is arranged immediately after the stack. This captures the lateral position of the just isolated arch. Based on this measurement, the sheet stack or the stack plate is displaced laterally, so as to supply the sheet in a precorrected position the feed table. There, then the side-pull mark can complete a final alignment.

Ultimately, it is disadvantageous that the position of the sheet must be detected at two measuring points. The position of the sheet is detected immediately after the sheet stack of the sheet feeder and the stack carrier plate moved without taking into account deviations that occur during the sheet transport to the leading brands.

The object of the invention is to provide a simple means by which it is ensured that regardless of the offset in the stack of sheets and occurring from the sheet transport to the leading brands deviations of the sheet position enter the sheet side edges in the work area of the page brand.

According to the invention the object is achieved by the features of the claim.

The inventive solution ensures that the stacking plate and thus the sheet stack is tracked according to the actual position of the sheet side edge in the range of the page mark. When using a For the electronic page mark, the measured values generated for controlling the gripper systems are advantageously used simultaneously for tracking the stacking plate.

• 1 eine schematische Darstellung eines Bogenanlegers mit einer Seitenmarke und nachgeordneten Druckwerken in der Seitenansicht
• 2 eine schematische ausschnittsweise Darstellung eines Bändertischs mit einem Anlegtisch und einer Seitenmarke in der Draufsicht
• 3 den Bogenanleger gem. 1 mit einer elektronischen Seitenmarke
• 4 die Anordnung gem. 2 mit einer elektronischen Seitenmarke.

The invention will be explained in more detail using an exemplary embodiment. In the accompanying drawings show

• 1 a schematic representation of a sheet feeder with a side mark and downstream printing units in the side view
• 2 a schematic partial view of a belt table with a feed table and a side mark in plan view
• 3 the sheet feeder gem. 1 with an electronic page mark
• 4 the arrangement acc. 2 with an electronic page mark.

In 1 is a sheet feeder 1 with a plant printing unit 2 and a follow-up printing unit 3 shown. Between the sheet feeder 1 and the plant printing unit 2 are a belt table 4 and a feed table 5 intended.

From the sheet feeder 1 are a pile support plate 6 on a pallet 7 with a bow 8th existing sheet pile 9 is arranged, as well as a sheet separator 10 shown.

At the pile carrying plate 6 not shown lifting elements, through which the stack support plate 6 is raised or lowered, and an adjusting device 11 at. With the help of the adjusting device 11 is it possible to use the pile carrier plate 6 and thus the sheet pile 9 in a direction perpendicular to a transport direction 12 to move in the direction of progress.

In 2 are partial from the belt table 4 a guide plate 13 , a conveyor belt 14 and a guide roller 15 shown. Usually, at least two conveyor belts 14 distributed over the width of the belt table 4 arranged. Furthermore, a bow to be aligned 22 and a follow-up arc 23 as well as in one at the feed table 5 provided latching position located front lays 29 shown. The conveyor belts 14 wrap around the guide roller 15 and are by means not shown in the transport direction 12 driven. The the band table 4 Subordinate feed table 5 who left a table 16 exists is with a side mark 17 provided, which consists of a side stop 18 and a pulling device 19 consists, which is formed in the embodiment as Saugziehschiene. The page mark 17 is in its entirety in one in the table 16 provided channel 20 arranged displaceable and lockable. The channel 20 is with a guide grid 21 that with the surface of the table 16 compares, coverable. The pulling device 19 is in the machine cycle by means not shown perpendicular to the transport direction 12 and thus relative to the side stop 18 executed carried out.

With the side stop 18 is a measuring device 24 for determining the position of the side edge of the sheet to be aligned 22 connected. The measuring device 24 is formed for example as a CCD element. The measuring device 24 is with a memory / evaluation unit 27 connected to one the rotational angle position of the plant printing unit 2 detecting rotary encoder 28 connected is. The memory / evaluation unit 27 stands with a calculator 26 in conjunction with the actuator 11 connected is.

The bows 8th be in a known manner by the sheet separator 10 provided separating suction from the top of the sheet pile 9 isolated and by means also provided in the sheet separator transport suction the belt table 4 fed and from this scaly to the feed table 5 promoted. This will be the respective bow to be aligned 22 with his side mark 17 facing side edge at a distance past the side stop 18, the position of the side edge of the measuring device 24 recorded as well as the bow to be aligned 22 with the front edge against the front lays 29 guided and so aligned to the leading edge. Then the bow to be aligned 22 from the pulling device 19 recorded as well as with the side edge against the side stop 18 guided and so aligned to the side edge. Below is the bow to be aligned 22 from the pulling device 19 released, the bow 22 is detected by a transport device, not shown, the leading brands 29 swing into one under the feed table 5 located detent position and the bow 22 is conveyed to a downstream printing press. Parallel to this, the next sheet will be 23 from the belt table 4 with the leading edge against the back at the feed table 5 positioned front lays 29 guided. The side edge of the next sheet 23 indicates, for example, a distance a to the side edge of the bow to be aligned 22 on. This distance a is due to the offset of the sheet pile 9 causes, so that usually the following arc 23 downstream arc 8th also at a distance a to each other on the feed table 5 be encouraged. Because only then the respective bow to be aligned 22 safe from the pulling device 19 recorded and to the side stop 18 can be transported if this is within a workspace b the pulling device 19 shrinking, these would not be detected by the pulling device 19 after a certain arc sequence and thus stopper occur. Through the measuring device 24 becomes the position of the side edge of each sheet to be aligned 22 detected and a signal of the memory / evaluation unit 27 fed. In the memory / evaluation unit 27 These signals are with a desired position, eg the central position of the work area b compared and generated at a tendency deviation from this target position, a signal which the computer 26 is supplied. Through the calculator 26 becomes the adjusting device 11 so influenced that the pile support plate 6 and thus the sheet pile 9 transverse to the transport direction 12 is moved, so that each sheet to be aligned 22 in the desired position of the measuring device 24 be recorded.

In the 3 are like in 1 the sheet feeder 1 with the plant printing unit 2 , the follow-up printing unit 3 as well as with the sheet feeder 1 downstream belt table 4 and feed table 5 shown. Instead of side stop 18 and pulling device 19 existing page mark 17 is the feed table 5 an electronic page mark 30 for detecting the position of the side edge of each sheet to be aligned 22 shown.

In the plant printing unit 2 is a bow accelerator 31 shown in the embodiment of a vibration system 32 and a feeder drum 33 consists. The vibration system 32 is arranged with vibrating grippers distributed over the width 34 and the feed drum 33 with drum grippers 35 Mistake. The vibratory grippers 34 and the drum grippers 35 are arranged displaceably in the axial direction by adjusting means not shown in their entirety. The electronic page mark 30 is with an evaluation / control unit 25 connected to the the drum gripper 35 or the vibrating grabs 34 influencing adjusting means is in operative connection. The evaluation / control unit 25 is still with the actuator 11 connected.

As in the embodiment according to 1 and 2 described, the bows are 8th the feed table 5 fed. This will be the respective bow to be aligned 22 with the front edge against the at the feed table 5 positioned front lays 29 guided and so aligned to the leading edge. Through the electronic page mark 30 becomes the position of the side edge of the sheet to be aligned 22 recorded and the measured value of the evaluation / control unit 25 fed. In the evaluation / control unit 25 becomes the of the electronic page mark 30 determined measured value with a in the evaluation / control unit 25 stored setpoint compared. In the event of deviations of the actual value from the nominal value, signals are generated and these are the vibration grippers 34 or drum gripper 35 supplied in the axial direction shifting adjusting means. That is, after the position of the side edge of the sheet 22 to be aligned from the electronic page mark 30 was detected, the bow to be aligned 22 from the vibrator grabs 34 clamped and the front lays 29 in their under the feed table 5 pivoted latching position.

After detecting the bow to be aligned 22 through the vibratory gripper 34 becomes the vibration system 32 to the application drum 33 pivoted and while the vibratory gripper 34 displaced in the axial direction by means of the adjusting means and the signals generated by the reference-actual value comparison, so that the sheet to be aligned 22 with a side edge located in desired position on the drum gripper 35 the application drum 33 is handed over.

But it is also possible, the drum gripper 35 or the drum gripper 35 and the vibratory grabs 34 to move.

In the evaluation / control unit 25 become the ones from the electronic page mark 30 stored measured values and an average of the position deviations over several sheets to be aligned 22 educated. In the presence of a positional deviation tendency of the desired position of the side edge, a signal is generated, which the adjusting device 11 for moving the pile support plate 6 and thus the pile of sheets 9 transverse to the transport direction 12 by means of the adjusting device 11 is supplied.

LIST OF REFERENCE NUMBERS

1

sheet feeder

2

Plant printing unit

3

Follow printing unit

4

belt table

5

feed table

6

Pile carrier plate

7

palette

8th

bow

9

sheet pile

10

sheet separator

11

setting device

12

transport direction

13

guide plate

14

conveyor belt

15

deflecting

16

table

17

page brand

18

side stop

19

puller

20

channel

21

transfer grilles

22

bow to be aligned

23

episode arc

24

measuring device

25

Signal conditioning / control unit

26

computer

27

Storage / evaluation

28

Rotary encoder

29

front lay

30

electronic page mark

31

Sheet accelerating device

32

swing feeder

33

feed drum

34

Schwinger gripper

35

drum gripper

a

distance

b

Workspace

Claims (1)

Device for laterally aligning sheets, consisting of a pile support plate (6) carrying a sheet stack (9) with an adjusting device (11) for laterally displacing same, further comprising means (4, 10) for singulating and conveying the sheets in a transport direction ( 12) to a feed table (5) having an electronic side mark (30) for detecting the lateral position of the sheets (8), wherein the electronic side mark (30) is connected to an evaluation / control unit (25) such that in the evaluation / control unit (25) via a target / actual comparison control signals for the feed table (5) subordinate gripper systems for lateral displacement of the sheet (8) and control signals for the adjusting device (11) of the stack support plate (6) can be generated, wherein Determining the required adjustment of the stack support plate (6) on the formation of an average value of the positional deviations over several sheets to be aligned (22) a positional deviation tendency he is indirect.

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