EP1493698B1 - Device for aligning sheets transversal to the direction of travel of the sheets - Google Patents

Abstract

Device has a sheet-conveying retaining device (05) which is displaceably mounted for holding the sheet (10-12) against a side guide (03). At least two sheets are arranged one above the other in an offset manner in the direction of travel. An effective retaining surface extending in the direction of travel is longer in the longitudinal direction (105) than in the transverse direction. The ratio of the length of the effective retaining surface in the longitudinal direction to the width of the effective retaining surface in the transverse direction is greater than three. Independent claims are also included for the following: (1) Alternative devices for aligning sheets; and (2) Process for aligning sheets.

Description

The invention relates to a device for aligning sheets transversely to the sheet running direction according to claim 1.

Pull marks are known in various designs, which draw mainly with static friction each sheet against a fixed stop - the actual side mark. Once there, the bow can lie down immediately because the delicately employed pulling mechanism moves on the bow, but the static friction immediately jumps over to sliding friction.

There are powered draw rails, draw rolls or pull segments in the sheet feed table. If the sheet has arrived in the front lays, it is first pressed from above with a finely adjustable spring-loaded and cyclically up and down on the driven part of the pulling device under the arch. The drawing path of the pull mark is always slightly larger than the spread of the incoming bow shed plus a minimum pulling distance of a few millimeters to the fixed side mark stop. The latter is depending on the sheet size and desired side position of the incoming sheet in the press adjustable on the feed table or attached to the comb plate.

These known drag brands have the disadvantage that they pinch the bow from above and below while pulling. Therefore, after the drawing process has finished, the drawing mark must remain open until each end of the sheet passes the drawing mark line, ie has released. Only then can the following bow, which is already in the front lays, be pulled by the puller. And the third arc of the incoming scale flow must still far away from leading brands and Ziehmarkenlinie be that he has not yet reached the working on the second sheet, ie closed, Klemmziehmarke.

For fast-running sheet-fed printing machines, it is customary to keep the plate and blanket cylinders as small as possible. Then paper speeds, but also production costs are smaller. The arc length can often _^3/4 bis _^5/6 of the plate cylinder circumference amount, ie the cylinder pits are short and the arc followed very closely aligned. Pinch marks no longer work because the long bows release the dowel line too late for pulling the following bow. In these cases Saugziehmarken be used in which the pressure roller is missing from above

In the feed table there is a driven Saugziehleiste which sucks each sheet with a sufficient number of small Saugluftlöcher and pulls transversely to the sheet travel direction against a fixed side mark. For each paper thickness up to the cardboard, the suction air is adjusted in such a way that each sheet is pulled with static friction from the suction nozzle to the side mark and remains there, while the now automatically occurring sliding friction allows further movement of the squeegee to the dead center.

Known Saugziehmarken thus act without clamping effect only from below on the sheet. They allow working in a covered state from the previous end of the sheet and thus higher sheet rates per hour than Klemmziehmarken. The disadvantage, however, is that the third subsequent sheet, which is brought under the respective bow to be aligned in the shingled stream, even with Saugziehmarken - as with Klemmziehmarken - not yet reach the working pull mark - because he does not come between the sucked second arc and suction nozzle. He can only if the Saugziehmarke does not work, so "open" is for downward moving bow.

The drawbacks of the prior art arcuate and suction markers for sheet side registration could be avoided by providing a top puller.

DE 33 05 219 C2 describes the use of a top-acting Saugziehmarke for very small scale spacing.

From DE 100 55 584 A1 a device for the lateral alignment of sheets is known in which an effective suction surface of a suction nozzle in the sheet transport direction is greater than in the transverse direction.

DE 33 02 873 C2 discloses a suction gripper acting from above, which is raised to further promote a following arc under the bow to be aligned.

DE 11 10 656 B shows a reciprocating suction segment for the lateral alignment of sheets.

US 2 167 823 discloses a device for aligning sheets transversely to the sheet running direction, wherein a sheet transporting holding means the sheet is arranged to move against a side mark and at least two sheets in the sheet running direction are arranged one above the other, wherein an effective holding surface extends in the sheet running direction, which is longer in the longitudinal direction than in the transverse direction and wherein the holding device is arranged to act from above on the sheets. In this case, three sheets are arranged simultaneously in the region of the holding device.

DE 27 35 711 A1 shows a device for the lateral alignment of sheets by means of a suction belt acting from below.

DE 27 11 554 A1 and DE 653 308 C each describe a device for aligning sheets, in which a trailing in the sheet running direction end of an already aligned sheet is again moved away transversely to the direction of sheet travel of a page mark.

DE 198 22 307 A1 discloses a device for aligning sheets transversely to the sheet running direction, wherein a transporting the sheet from below transport roller moves the sheet against a side mark, which executes 1 / N revolutions per sheet to be aligned.

US 1 728 329 A discloses a device for laterally aligning sheets by means of peripheral suction rollers engaging from above

The invention has for its object to provide a device for aligning sheets transverse to the direction of sheet travel.

The object is achieved by the features of claim 1.

The achievable with the present invention consist in particular that a working from above side puller works without clamping action. This allows for the first time, the underrun of the Ziehmarkenlinie by the subsequent arc, while the puller draws a sheet applied in the front lays still to the side of a fixed side edge stop.

Advantageously, by the novel "Saugziehmarken from above" the bow in very narrow scale distance, so much slower, run on the investment table to the leading brands and reach them in an earlier date, because there are no more inlet lock for the bow. The Ziehmarkenlinie is always free, because any clamping action is missing down to the feed table. By earlier reaching the leading brands significantly longer time angle for front and side edge alignment are available. This allows correspondingly higher machine speeds without keeping the real alignment times shorter than usual in milliseconds.

In a further embodiment of the "Saugziehmarke from above" it can be combined with known small lateral offset of the incoming into the printing press sheet. Then the Saugziehmarke can work from above even if the bow end of the previous arc nor the Ziehmarkenlinie covered and at the same time a subsequent arc also falls below the Ziehmarkenlinie. This means that in a new way, not just two, but three sheets are simultaneously in the draw mark area. This explains why, despite much higher engine speed, equal or longer sheet alignment times are available from above through the suction drag marks.

An embodiment of the invention is illustrated in the drawings and will be described in more detail below.

Fig. 1

die linke Ecke des Anlegetisches von oben;

Fig. 2

Schnitt Saugziehmarke mit Anlegetisch;

Fig. 3

Antrieb der quer verschiebbaren Saugwalze;

Fig. 4

Weg-/Zeitdiagramm der Bogenzuführung mit klassischer Ziehmarke;

Fig. 5

Weg-/Zeitdiagramm der Bogenzuführung mit der erfindungsgemäßen Seitenmarke.

Show it:

Fig. 1

the left corner of the feed table from above;

Fig. 2

Cut suction mark with feed table;

Fig. 3

Drive the transversely displaceable suction roller;

Fig. 4

Path / time chart of sheet feeder with classic pull mark;

Fig. 5

Path / time diagram of the sheet feeder with the side mark according to the invention.

In Fig. 1 are located on a feed table 01 several leading brands 02, which open down. There are page marks 03 with deck marks 04. The deck marks 04 are under a suction roll 05 in their grooves. The suction roll 05 has two opposing rows of suction holes 06, of which the upper row is visible. The Saugwalzenachsstummel rotate in two bearing arms 07 which are outside the paper size adjustable attached to the feed table 01. Through a hose 09 suction air is fed into the suction roller 05 and out with a visible only in Fig. 2 slot mouthpiece 22 to the Saugrohrwandung. The Saugwalzenachse is parallel to the sheet travel direction L and in the vicinity of the aligned Bogenseitenkante. The drive of the suction roller 05 via a toothed belt wheel 14, a toothed belt 15 and a pinion 16 a Eintourenwelle in the sheet feeder or in the printing press or for example on its own speed and / or position-controlled electric drive by means of electronic shaft.

The suction roller 05 runs in accordance with FIGS. 1 to 3 semi-revolving with the two Saugluftlochreihen, d. H. the suction roll 05 is arranged so that it per sheet 10 to be aligned; 11; 12 half a turn. The suction roll 05 has a favorable diameter between 50 and 60 mm. You can also different, z. B. third-rate, be constructed.

The suction roll 05 is accordingly arranged so that they are per sheet 10 to be aligned; 11; 12 ¹ / _N revolutions, where N = 2, 3, 4, ..., ie an integer greater than 2.

The suction roller 05 is per sheet 10 to be aligned; 11; 12 ¹ / _N turns arranged executing. N = 2, 3, 4, ..., ie an integer greater than 2.

Fig. 1 shows an expiring in the printing machine first sheet 10 on front marks 02, which after the page alignment on page marks 03 with a conventional sheet feeder, z. B. a vibrator from below or detected by means of suction conveyor from below lying down in the leading 02 and accelerated from the feed table 01 is subtracted. In this case, the sheet feeder moves axially, ie transversely to the sheet travel direction L, to an always constant amount A of z. B. 26 mm. As a result, the lying approximately below the central axis of the suction roller 05 narrow, z. B. 6 mm wide, suction slot over its entire suction roller length of the side edge of the expiring first sheet 10 exposed.

Fig. 1 shows that the end of the sheet 10 has not yet left the suction roll area. The side shift A, however, allows the suction roll has already actively pulled the next second sheet 11, which is already in the front marks 02, to the left to the page marks 03. The sheet feed of this second sheet 11 may soon begin even if the end of the first sheet 10 still overlaps the leading marks 02.

A third sheet 12, which has already arrived in the area of the suction roll 05, moves slowly in the direction of the leading marks 02. Since it lies under the second sheet 11, which the suction roll 05, which acts from above, pulls straight onto the side marks 03, the suction roll 05 not suck in the third sheet 12 yet. This happens only in the next period when the second sheet 11 laterally shifted by distance A - as now the first sheet 10 - runs into the machine and the suction slot in suction roller 05 exposes the third sheet 12, etc. Hatched is a tolerance band thirteenth marked by z. B. ± 6 mm. With this maximum scattering the scaled lying single sheets run from the sheet feeder on the feed table 01 in the front marks 02. The active narrow, but long suction duct of the suction roll 05 lying above the sheet flow is below the center line of the suction roll 05 between the sheet inlet tolerance band 13 and the Side edge of all expiring and by the amount A of the Page marks 03 offset sheet side edges. This is the strip labeled B. In this arrangement, the suction roller 05 caught all incoming within the tolerance band 13 arc 10; 11; 12 of the scale flow, but not the offset side edges of all accumulating sheet 10; 11; 12th

The ratio of effective holding area in the longitudinal direction 105 to the effective holding area in the transverse direction b05 should be greater than 3, preferably greater than 5.

The three sheets 10; 11; 12 are arranged between two the length 105 of the effective holding surface of the holding device 05 limiting, extending transversely to the sheet running direction straight lines 23, 24.

Fig. 2 shows the suction roller 05 on the feed table / comb plate 01. The first sheet 10 runs at a distance A, z. B. 26 mm, offset from the side mark 03, in the machine. It is located to the right of the Saugwalzenmitte outside the suction air duct 22nd

The second sheet 11 is pulled by one of the two elevated Saugluftsegmente with suction holes 06 to the side mark 03. Several deck marks or Leitzungen 04 protrude over the side marks 03 in grooves to about the middle under the suction roll 05. The deck marks 04 prevent thin sheets 10; 11; 12 bulge in the gusset between feed table 01, page mark 03 and suction roller 05 at impact on side marks 03.

The two active Sauglöchersegmente the suction roll 05 face each other and are about 30 ° to 45 ° long at half-round circumferential suction roll 05, so that there is a long Ziehzeitwinkel of about 90 ° and a pull of the suction roll 05 of about 20mm.

The circulating suction roller 05 can the cyclical switching on and off of the suction air to take over for yourself. For this purpose there are only suction holes 06 in the two opposite 45 ° segments. Within the circulating suction roll 05 is a fixed tube 21 as Saugluftzufuhr over the entire length of the suction roll 05. The tube 21 has a downwardly directed air slot 22 of z. B. 6 mm width over the length of the suction roller 05th

It is also conceivable that the suction roller 05 has all around suction holes 06, rhythmically or freely rotates and the suction air clocked via a slot-like mouthpiece 22 within the suction roller 05 and directed downwards.

The suction roll 05 has a plurality of segments with suction holes 06 in the circumferential direction, each segment a different sheet 10 to be aligned; 11; 12 sucks. Preferably, the suction roll 05 has two segments in the circumferential direction.

Where, according to FIG. 2, the cover marks / guide tongues 04 are located in the suction rolls at the bottom, d. H. in the Saugwalzennuten, the suction slot 22 is not milled through the tube 21, which increases the stability of the suction tube 21. The vacuum is switched extremely fast, since it is retained in tube 21 and only the air holes 06 must be sucked empty near the mouth. In the suction roll 05, the interspaces to the two active suction segments 06 are set slightly lower. This facilitates the discontinued in the machine offset first sheet 10 undisturbed next to and parallel to the suction roller center to leave the feed table 01.

In Fig. 2, the incoming third sheet 12 is within the scale tolerance band 13 to the right of the side mark 03 and left of the center of the suction roll 05, so in itself in the suction 22. Since the second sheet 11 is above the third sheet 12 and the second Sheet 11 is pulled with the suction roller 05 from above against the side mark 03, the third sheet 12, because covered by the first sheet 11, are not sucked by the suction roller 05. The third sheet 12 can thus be undisturbed despite working side-pull mark 03 move further in the direction of front mark 02.

Fig. 3 illustrates a drive example of lying on the feed table 01 suction roller 05 which is driven by the gear wheel 14, timing belt 15 and drive wheel 16 half-speed. Bevel gears 17; 18 above the feed table 01 are by a vertical axis 19 with 2: 1 bevel gears 30; 31 connected under the feed table 01. In the bevel gear 31 is a screwed-keyway 32 which engages in a continuous groove 33 a transversely under the Anlagetisch 01 rotating Eintourenwelle 34. About this Eintourenwelle 34 is a coverable slot in the feed table 01 for the passage of the vertical bevel gear drive shaft 19 from below still above. Thus, the whole complex Saugziehmarke with drive transversely to the sheet travel direction L depending on sheet width on SI (control side) or with a mirror-image Saugziehmarken complex on Sll (drive side) of the printing press are moved.

It can be seen in Fig. 3 also that for the purpose of investment time profit in a novel way, three sheets 10; 11; 12 are simultaneously in the Ziehmarkenbereich while it is in a known manner so far only two sheets.

Fig. 4 shows a path / time diagram of the sheet feeder with the classic drawing mark ZM in position -150 mm from the zero line. The abscissa describes the active time angle of a single-turn shaft, eg. B. a plate cylinder from 0 ° to 360 °, the ordinate the sheet path in mm.

The first arc on the left is rotated at 90 ° time angle, e.g. accelerated by means of oscillating pre-gripper, parallel-shaped to cylinder peripheral speed and leaves as 45 ° straight front line equal abscissa.

A second arc runs more slowly in the stream of stream with dandruff length SL = 300 mm and hits the front marks at 210 °. He touches the front end 80 ° long, namely to 290 °. Then the classic side-pull mark sets in, which has already been released by the expiring first bow, with a maximum length of 720 mm. The drawing time is 60 ° until the pull mark opens at 350 °. Only then may the third sheet 12 pass the Ziehmarkenlinie-150 mm of the leading brands, which enforces the relatively large scale spacing of SL = 300 mm with 210 ° arrival point. Extra long bow of z. B. 850 mm length cover the pull mark. In this case, it must then be a Saugziehmarke from below.

FIG. 5 shows an improved travel / time diagram with the side-pull mark according to the invention, which draws the sheet with suction only from above. Bow beginnings and bow ends move as in Fig. 4. The second sheet meets much earlier, namely at 140 °, to the leading brands and has 120 ° contact time to 260 ° when the pull mark begins.

The scale distance SL is only 180 mm, because the third sheet does not have to wait for the drawing mark to open, as in FIG. The third sheet 12 can undermine the working draw mark and may therefore be located in the 120 mm long range of the draw mark suction roll of 250 mm-130 mm - this allows the cheapest, because smaller scale spacing of only 180 mm.

At a normal maximum sheet length of 720 mm, the sheet end passes the drawing-mark suction roll before it starts to work from 260 ° to 350 °, ie with a 90 ° drawing time.

For overlong bow, z. B. 850 mm long or 306 ° of 1000mm cylinder circumference one-speed, covers the expiring arc end of the working Saugziehmarke. In such cases, the leaking bow must be laterally, z. B. offset by 26 mm, to give the pull mark timely at 260 °.

The comparison of FIG. 4 with FIG. 5 shows that the application times are 50% longer, namely 120 ° instead of 80 ° for the front marks and 90 ° for the side draw value instead of 60 °. This is possible because not only the second sheet each, but also the third sheet can be in the area between the toggle mark mechanism and front marks 02. At the same time, this allows a favorably small scale clearance with lower speed and less risk of rebound when kicked off in the front lays.

LIST OF REFERENCE NUMBERS

01

feed table

02

front lay

03

page brand

04

Deckmark, Leitzunge

05

Holding device, suction roll

06

Suction holes, suction air holes, suction segments, holding surface

07

bearing arms

08

-

09

tube

10

Bow, first

11

Bow, second

12

Bow, third

13

tolerance band

14

toothed belt

15

toothed belt

16

drive wheel

17

bevel gear

18

bevel gear

19

Axis, vertical, bevel gear drive shaft

20

-

21

pipe

22

Louver, slot mouthpiece

23

Just

24

Just

25

-

26

-

27

-

28

-

29

-

30

bevel gear

31

bevel gear

32

adjusting spring

33

groove

34

single turn shaft

A

constant amount, distance

B

constant amount, distance

L

Running direction, sheet travel direction

l05

Length of the holding surface, longitudinal direction

b05

Width of the holding surface, transverse direction

ZM

pull guide

VM

front lay

SL

Scale length, scale spacing

Claims (16)

1. An apparatus for aligning sheets (10; 11; 12) transversely to the direction of travel (L) of the sheets, wherein a suction roller (05) conveying a sheet (10; 11; 12) is arranged so as to move the sheet (10; 11; 12) against a side lay mark (03), wherein the rotating suction roller (05) comprises a plurality of segments with suction apertures (06) in the peripheral direction, wherein each segment sucks on another sheet (10; 11; 12) to be aligned, wherein the suction roller (05) is arranged so as to act upon the sheets (10; 11; 12) from above.
2. An apparatus according to Claim 1, characterized in that the suction roller (05) comprises two segments with suction apertures (06) in the peripheral direction.
3. An apparatus according to Claim 1, characterized in that at least two sheets (10; 11; 12) are arranged in an imbricated manner one above the other in the direction of travel (L) of the sheets.
4. An apparatus according to Claim 1, characterized in that one longitudinal axis in the suction roller (05) is arranged substantially in the direction of travel (L) of the sheets (10; 11; 12).
5. An apparatus according to Claim 1, characterized in that a ratio of a length (105) of an effective holding face of the suction roller (05) in the longitudinal direction to a width (b05) of the effective holding face in the transverse direction is greater than 3, and preferably greater than 5.
6. An apparatus according to Claim 1, characterized in that the suction roller (05) is arranged on a feeder table (01).
7. An apparatus according to Claim 1, characterized in that on its periphery the rhythmically running suction roller (05) has at least one segment with suction apertures (06) and one segment without apertures, and a stationary suction-air tube (21) is arranged in such a way inside the rotatably mounted suction roller (05) that only one narrow strip of all the air apertures is acted upon with suction air in order to suck on and convey laterally a sheet (10; 11; 12) situated below the suction roller (05) through a narrow slot over the length of the suction roller (05).
8. An apparatus according to Claim 1, characterized in that the suction roller (05) has suction apertures (06) all round and rotates rhythmically or freely and the suction air is supplied in a clock-timed manner by way of a slot-like nozzle (22) inside the suction roller (05) and directed downwards.
9. An apparatus according to Claim 7, characterized in that the active, narrow and long suction-air strip - situated below - of the suction roller (05) is arranged between a tolerance area (13) of sheets (10; 11; 12) running in and a lateral edge - aligned offset - of a sheet (10; 11; 12) running out.
10. An apparatus according to Claim 1, characterized in that up to three sheets (10; 11; 12) are retained at the same time in the region of the suction roller (05), under it and parallel to it, even during the active drawing of the sheets.
11. An apparatus according to Claim 1, characterized in that an imbrication interval of the sheets (10; 11; 12) on a feeder table (01) is so small that, when the suction apparatus drawing from above is running, a following sheet (10; 11; 12) is already moving under a sucked-on sheet (10; 11; 12) in the direction of the front lay marks (02).
12. An apparatus according to Claim 1, characterized in that the suction roller (05) rotates a half turn and has two mutually opposed suction-air segments and, between them, a slightly smaller radius.
13. An apparatus according to Claim 1, characterized in that the suction roller (05) is driven by way of a separate motor in synchronism with a press arranged downstream.
14. An apparatus according to Claim 1, characterized in that the suction roller (05) is driven by way of a separate motor in synchronism with a press arranged downstream in a mechanical manner by way of a splined shaft rotating transversely below the feeder table (01) and with displaceable bevel gears.
15. An apparatus according to Claim 1 or 8, characterized in that a drive of the suction roller (05) permits a format adjustment transverse to the direction of travel (L) of the sheets.
16. An apparatus according to Claim 1, characterized in that the suction roller (05) adjustable in accordance with the sheet format is driven from a fixed driving point by means of a flexible shaft arranged above the feeder table (01).

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