EP1460009B1 - Device for aligning sheets - Google Patents

Abstract

The mechanism for aligning printed sheets (1) comprises a rotating cylinder (04) with front stops and suction ports around its surface, on to which the sheets flow. A position sensor detects the position of the sides of the sheets relative to a desired position and controls an adjuster. A drive motor for the cylinder can be controlled to vary its speed of rotation. An independent claim is included for a method for aligning printed sheets using the mechanism.

Description

The invention relates to a device for aligning sheets according to the preamble of claim 1.

From EP 01 20 348 A2 a device and a method for aligning sheets is known. The orientation of the leading edge of the sheet is effected in such a way that the scale-like fed to the device sheet are fed at a conveying speed to an alignment in the device, which is at least slightly greater than the peripheral speed of the alignment. At the periphery of the alignment cylinder front marks are arranged, at which the leading edge of the sheet can be brought to bear. Due to the relative speeds between the sheet and leading marks, the leading edge of the sheets is at least slightly slowed down at the leading brands, thereby aligning the leading edge of the sheet. After the alignment of the leading edge of the sheet, the sheet is fixed in the region of the front edge by applying a negative pressure to a suction strip, so that the sheet wraps around the alignment cylinder on the circumference due to the continuous rotational drive of the alignment cylinder. After the alignment of the leading edge of the sheet and before the transfer of the sheet to a downstream device, the lateral offset of a side edge of the sheet is measured by means of a measuring device. Depending on the measurement result, the squeegee on which the leading edge of the sheet is fixed is axially displaced axially in the direction of the axis of rotation of the alignment cylinder to thereby align the side edge of the sheet in accordance with the desired target orientation. As a result, it is achieved that the sheet both in relation to the leading edge and with respect to a side edge in the correct position to a downstream device, such as a sheet-fed press, can be passed.

From DE 23 13 150 C3 a device for sheet feeding for a sheet-fed rotary printing press is known, in which the sheets are scaled on a feed table to the device out and away from the device. To promote the sheet resting on the feed table the use of suction rolls is described, on the entire circumference recesses are provided. By applying a negative pressure, the sheet can be fixed on the circumference of the suction roll. The suction roll is arranged in such a way in a recess of the feed table, that the sheet surface on the feed table resting and tangentially on the periphery of the suction roll are driven adjacent fitting. This ensures that the sheets come into contact with the suction roll only in a linear contact area, wherein the driving forces are transmitted from the suction roll in the linear contact area frictionally engaged on the sheet. A wrap of the suction rolls through the arc is thus not required.

From WO 97/35795 A1 a device with a suction drum is known, on whose circumference the sheets to be transported are frictionally fixable by applying a negative pressure. The drive of the suction drum is designed such that the speed and / or the angle of rotation of the suction drum can be controlled by an independent electric motor according to predetermined laws of motion.

From DE-AS 20 46 602 a sheet feeder for printing machines is known in which the lateral offset of a side edge of the sheet is detectable relative to a desired orientation with a measuring device. To align the side edge of the sheet can be adjusted axially in the direction of its axis of rotation depending on the measurement result, an alignment, on the circumference of the sheet is fixed.

From EP 01 20 348 A2 a device for measuring the position of the side edge of a sheet is known. This measuring device consists essentially of 2 measuring heads, which are used to measure the position of the side edge with at the periphery of a Conveying roller arranged query gaps interact. In order to be able to variably set the measuring heads to different sheet widths, the measuring heads are mounted by hand on a traverse arranged above the sheet conveying plane.

From EP 07 16 287 A2 a non-contact device for measuring the position of sheets is known, in which the side edges of the sheet can be measured by means of an optical system.

The invention has for its object to provide a device for aligning sheets.

The object is achieved by the features of claim 1.

The advantages achievable with the invention are, in particular, that the sheets can be aligned during the promotion by the alignment cylinder at the same time with respect to its front edge, as well as with respect to a side edge. The orientation of the sheet with respect to its side edge can be advantageously achieved in that the alignment cylinder is adjusted axially in the direction of its axis of rotation after the alignment of the leading edge to the front marks.

Furthermore, it is advantageous if the drive motor can be controlled or regulated for the rotational drive of the alignment cylinder as a function of predetermined laws of motion, in particular as a function of the angle of rotation. This makes it possible by variation of the rotational speed of the alignment during a cycle and bow of different lengths to take correct position at the front and accurately pass to downstream sheet transport facilities.

Embodiments of the invention are illustrated in the drawings are described in more detail below.

Fig. 1

eine erste Ausführungsform einer Vorrichtung zur fließenden Ausrichtung von Bogen im Querschnitt;

Fig. 2

die Vorrichtung gemäß Fig. 1 in einem vergrößerten Ausschnitt während einer ersten Phase zur Ausrichtung der Vorderkante eines Bogens;

Fig. 3

die Vorrichtung gemäß Fig. 2 in einer zweiten Phase zur Ausrichtung der Vorderkante eines Bogens;

Fig. 4

die Vorrichtung gemäß Fig. 1 im Längsschnitt entlang der Schnittlinie I - I;

Fig. 5

eine zweite Ausführungsform einer Vorrichtung im Längsschnitt;

Fig. 6

die Vorrichtung gemäß Fig. 5 im Querschnitt;

Fig. 7

eine Bogenanlage mit einer dritten Ausführungsform einer Vorrichtung zur Ausrichtung von Bogen in perspektivischer Ansicht;

Fig. 8

die Bogenanlage gemäß Fig. 7 in einer zweiten perspektivischen Ansicht;

Fig. 9

die Bogenanlage gemäß Fig. 7 im Schnitt aus perspektivischer Ansicht;

Fig. 10

die Lagerung des Ausrichtzylinders für die Bogenanlage gemäß Fig. 7 in perspektivischer Ansicht;

Fig. 11

die Lagerung gemäß Fig. 10 mit Anlegetisch und schematisch dargestellten Bogen in perspektivischer Ansicht;

Fig. 12

eine Ausführungsform einer Bogenfördereinrichtung für eine Bogenanlage gemäß Fig. 7 in perspektivischer Ansicht;

Fig. 13

eine Bogenführung für eine Bogenanlage gemäß Fig. 7 in perspektivischer Ansicht;

Fig. 14

eine erste Phase beim Ausrichten eines bewegten Bogens in einer Bogenanlage gemäß Fig. 7 in perspektivischer Ansicht;

Fig. 15

eine zweite Phase beim Ausrichten des Bogens gemäß Fig. 14 in perspektivischer Ansicht;

Fig. 16

eine Phase beim Ausrichten des Bogens gemäß Fig. 14 in perspektivischer Ansicht;

Fig. 17

die Zusammenschau der Diagramme von Weg, Geschwindigkeit und Beschleunigung der Rotationsbewegung eines Ausrichtzylinders angetragen über dem Drehwinkel des Ausrichtzylinders während eines Umlaufs;

Fig. 18

die Zusammenschau der Diagramme für Weg, Geschwindigkeit und Beschleunigung der Linearbewegung eines Ausrichtzylinders axial in Richtung seiner Rotationsachse angetragen über dem Drehwinkel des Ausrichtzylinders während eines Umlaufs;

Fig. 19

eine Vorrichtung zur Messung der Lage der Seitenkanten eines Bogens in einer Bogenanlage gemäß Fig. 7 in perspektivischer Ansicht von oben;

Fig. 20

die Vorrichtung gemäß Fig. 19 in perspektivischer Ansicht von unten;

Fig. 21

die Vorrichtung gemäß Fig. 19 in seitlicher Ansicht von hinten;

Fig. 22

die Vorrichtung gemäß Fig. 19 in seitlicher Ansicht von einer Querseite;

Fig. 23

die Vorrichtung gemäß Fig. 19 in teilweise geschnittener Darstellung aus perspektivischer Ansicht;

Fig. 24

den Antrieb der Vorrichtung gemäß Fig. 19 in perspektivischer Ansicht;

Fig. 25

eine Getriebestufe einer Vorrichtung gemäß Fig. 19 in perspektivischer Ansicht von unten;

Fig. 26

den Antriebsmotor für eine Vorrichtung gemäß Fig. 19 in perspektivischer Ansicht von unten;

Fig. 27

ein Abdeckelement für eine Vorrichtung gemäß Fig. 19 mit zugeordneter Führungseinrichtung in perspektivischer Ansicht von unten;

Fig. 28

ein Teileiement eines Kupplungsteils in perspektivischer Ansicht;

Fig. 29

ein weiteres Teilelement eines Kupplungsteils in perspektivischer Ansicht;

Fig. 30

ein Kupplungsteil in perspektivischer Ansicht;

Fig. 31

eine Kupplung zur Übertragung eines Antriebsmoments auf eine axial verstellbare Welle in seitlicher Ansicht;

Fig. 32

eine Kupplung gemäß Fig. 31 während einer ersten Phase zum rotatorischen Antrieb einer axial verstellbaren Welle;

Fig. 33

die Kupplung gemäß Fig. 32 in einer zweiten Phase zum rotatorischen Antrieb einer axial verstellbaren Welle;

Show it:

Fig. 1

a first embodiment of a device for the continuous alignment of sheets in cross section;

Fig. 2

the apparatus of Figure 1 in an enlarged detail during a first phase for aligning the leading edge of a sheet.

Fig. 3

the apparatus of Figure 2 in a second phase for aligning the leading edge of a sheet.

Fig. 4

the apparatus of Figure 1 in longitudinal section along the section line I - I;

Fig. 5

a second embodiment of a device in longitudinal section;

Fig. 6

the apparatus of Figure 5 in cross section.

Fig. 7

a sheet with a third embodiment of an apparatus for aligning sheets in perspective view;

Fig. 8

the sheet system of Figure 7 in a second perspective view.

Fig. 9

the sheet of Figure 7 in section from a perspective view.

Fig. 10

the storage of the alignment for the sheet system of Figure 7 in perspective view.

Fig. 11

the storage of FIG. 10 with feed table and shown schematically Arch in perspective view;

Fig. 12

an embodiment of a sheet conveying device for a sheet system of Figure 7 in perspective view.

Fig. 13

a sheet guide for a sheet system of Figure 7 in perspective view.

Fig. 14

a first phase when aligning a moving sheet in a sheet feeder according to FIG. 7 in a perspective view;

Fig. 15

a second phase in aligning the sheet of FIG 14 in a perspective view;

Fig. 16

a phase in aligning the sheet of FIG 14 in a perspective view;

Fig. 17

the synopsis of the graphs of travel, velocity and acceleration of the rotational motion of an alignment cylinder plotted against the rotational angle of the alignment cylinder during one revolution;

Fig. 18

the synopsis of the diagrams for path, velocity and acceleration of the linear movement of an alignment cylinder axially in the direction of its axis of rotation plotted against the rotational angle of the alignment cylinder during one revolution;

Fig. 19

a device for measuring the position of the side edges of a sheet in a sheet system according to Figure 7 in a perspective view from above.

Fig. 20

the device of Figure 19 in a perspective view from below.

Fig. 21

the device of Figure 19 in side view from behind.

Fig. 22

the device of Figure 19 in a side view of a transverse side.

Fig. 23

the device of Figure 19 in a partially sectioned view from a perspective view.

Fig. 24

the drive of the device of Figure 19 in perspective view.

Fig. 25

a gear stage of a device according to Figure 19 in a perspective view from below.

Fig. 26

the drive motor for a device according to Figure 19 in a perspective view from below.

Fig. 27

a cover member for a device according to Figure 19 with associated guide means in a perspective view from below.

Fig. 28

a Teiliement a coupling part in a perspective view;

Fig. 29

a further sub-element of a coupling part in a perspective view;

Fig. 30

a coupling part in a perspective view;

Fig. 31

a clutch for transmitting a drive torque to an axially adjustable shaft in a side view;

Fig. 32

a coupling according to FIG. 31 during a first phase for rotatably driving an axially adjustable shaft;

Fig. 33

the coupling of Figure 32 in a second phase for rotatably driving an axially adjustable shaft.

Fig. 1 shows a device 02 for aligning sheet 01 in cross-section. Such devices are used to align scaly from a scarfing device, not shown fed sheet in the correct position, so that the sheet, for example, exactly aligned z. B. can be passed to a downstream sheet-fed press. As illustrated in FIG. 1, the sheets 01 are fed to the device 02 lying one behind the other in such a way that in each case the front edge 07 of the respective rear sheet 01 comes to rest under the respective sheet 01 lying in front of it. The device 02 serves in particular to align the flake-fed sheet 01 during transport in the device 02 with respect to the front edge 07 and with respect to a side edge in the correct position, so that the sheet 01 after leaving the device 02 a downstream device 03, For example, a transfer cylinder 03 a sheetfed press can be fed in the correct position. To align the sheet 01 in the device 02 is an alignment cylinder 04, which is essentially composed of a drive shaft 05 and spaced thereon arranged suction rollers 06. (see Fig. 4). The alignment cylinder 04 has a diameter of 140 mm to 150 mm, in particular a diameter of about 144 mm. The function of the device 02 when aligning the leading edge 07 of the sheet 01 is shown in particular in FIGS. 2 and 3.

In Fig. 2, the upper part of the trained in the manner of a suction roller 06 alignment cylinder 04 is shown. Along a line running parallel to the axis of rotation of the alignment cylinder 04, a front mark is on the circumference of the alignment cylinder 04 08 attached to the front side, the leading edge 07 of the sheet 01 can come to rest to align the leading edge 07 of the sheet 01. For this purpose, the alignment cylinder 04 is driven at a peripheral speed which is at least slightly smaller than the conveying speed of the sheet 01 on a feed table 09. The sheets 01 are fed to the device 02 in synchronism with the movement of the front mark 08, so that in each case a front edge 07 in the Contact area of the front brand 08 can get. Due to the relative speed between the leading edge 08 and leading edge 07, the leading edge 07 runs on the leading edge 08 and can thereby be aligned continuously during the contact phase between leading edge 07 and leading edge 08. It has proven to be particularly favorable when the peripheral speed of the alignment 04 at least temporarily during contact between the leading edge 08 and leading edge 07 of the sheet 01 about 0.7 times to 0.9 times, in particular 0.8 times the conveying speed of the scaled sheet 01 corresponds immediately before contact between the leading edge 08 and leading edge 07 of the sheet. "Immediately before contact ..." means "first contact". The alignment cylinder 04 makes it per conveyed sheet 01 a revolution.

The front marks 08 has a height of 2 mm to 4 mm, in particular a height of 3 mm, over the circumference of the alignment cylinder 04.

In order to align the sheet 01 to the front marks 08 exactly, the aligning cylinder 04 opposite a sheet hold-down roller 11 is arranged. On the circumference of the sheet hold-down roller 11, a recess 12 is provided in such a way that, as is apparent in particular from FIG. 3, the leading mark 08 can be received without contact on the alignment cylinder 04 when passing the gap between alignment cylinder 04 and sheet hold-down roller 11. The sheet hold-down roller 11 is driven by a corresponding gear arrangement with a ratio of 1: 1 of the alignment cylinder 04, so that alignment cylinder 04 and sheet hold-down roller 11 synchronously move each other. The outer diameter of the sheet hold-down roller 11 is formed spirally, wherein the largest radius of the sheet hold-down roller 11 is arranged approximately in the region of the recess 12 for the front mark 08. It is thereby achieved that the gap between sheet hold-down roller 11 and alignment cylinder 04 is minimized during the alignment phase of the leading edge 07, respectively. During the further circulation of the sheet hold-down roller 11, the gap is subsequently enlarged again so as not to hinder the conveyance of the sheets 01.

Also, the stabilization of the sheet 01 during alignment with the front mark 08 is a hold-down plate 13 that is disposed in the inlet region 14. In order to optimally set up the device 02 as a function of the various process parameters, in particular as a function of the paper quality used, the feed table 09 and / or the hold-down roller 11 and / or the hold-down plate 13 can be adjustably mounted in height relative to the alignment cylinder 04. Depending on the process parameters to be considered, the distance between the tangent plane 16, measured when passing through the maximum radius of the sheet hold-down roller 11, should have a distance of about 0.8 mm to the top 17 to feed table 09. The alignment cylinder 04 is arranged in the manner below the feed table 09 that the sheet 01 come to rest substantially tangentially on the circumference of the alignment cylinder 04. Deviating from an ideal tangential arrangement of the alignment cylinder 04, however, slightly shifted upward, so that the tangent plane 19 extends to the alignment cylinder 04 with a slight distance, for example, 0.5 mm, above the top 17 of the feed table 09. This achieves, as can be seen in particular from FIG. 3, that a sheet 01 is slightly raised in the area of contact with the delivery cylinder 04, so that an optimal abutment of the sheet 01 on the circumference of the alignment cylinder 04 is possible and the drive forces are frictionally engaged in a sufficiently large contact surface are transferable.

As shown in Fig. 3, on the inside of the suction roller 06 is a suction member 21st arranged. On the suction member 21, a suction chamber 22 is provided, from which by means of a vacuum source, not shown, permanently generates air and is sucked off, so that in the suction chamber 22, a negative pressure of 0.2 to 0.6 bar prevails. In the phase shown in Fig. 3, the leading edge 07 of the sheet 01 is already aligned in the correct position and is located at the front mark 08 at. As soon as a recess 23 in the circumference of the suction roller 06 reaches the region above the suction chamber 22, the negative pressure prevailing in the suction chamber 22 is transmitted into the recess 23, so that the sheet 01 is thereby frictionally fixed on the circumference of the suction roller 06. As a result, this means that the sheet 01 is first aligned in the correct position when entering the contact region with the suction roll 06 by means of the leading marks 08 with respect to its front edge 07 and then fixed on the suction roll 06 by cooperation of the suction chamber 22 with the recess 23.

As can be seen from Fig. 1, the sheets are 01 during the entire time of promotion by the device 02 substantially flat in the sheet plane, which is defined by the top 17 of the feed table 09. After the correct orientation of the leading edge 07, the sheet 01 is fixed in the device 02 by at least one recess 23, which are provided starting from the front mark 08 in succession on the circumference of the suction roll 06, on the suction roll 06, so that the suction roll 06 with the Sheet 01 is frictionally connected in each case in a rectangular contact area and can drive the sheet 01.

After the orientation of the leading edge 07, the displacement of a side edge of the sheet 01 relative to a predetermined desired orientation is determined by means of a measuring device, not shown. Depending on the measurement result, the sheet 01 is displaced transversely to the conveying direction until the side edge runs along the desired orientation. For aligning the side edges of the sheet 01, the alignment cylinder 04 axially in the direction of its axis of rotation, that is, as shown in FIG. 1 off or in the drawing plane, are moved. Around To enable adjusting movement, the alignment cylinder 04 is fixed together with the drive shaft 05 in a first frame part 24, which in turn is mounted axially in the direction of the axis of rotation of the alignment cylinder 04 on a frame permanently mountable second frame member 26 (Fig. 4). For this purpose, the first frame part 24 may be designed, for example, as a roller-mounted linear unit and engage with a prismatic linear guide 27 on the second frame part 26.

The alignment cylinder 04, in particular together with the first displaceably mounted frame part 24, with up to +/- 15 m / s ² linearly accelerated in the direction of the axis of rotation of the alignment cylinder 04 and braked.

The transverse adjustment device 32 is designed such that the alignment cylinder 04, in particular together with the first displaceably mounted frame part 24, from a zero position by up to +/- 8 mm, in particular by up to +/- 5 mm, linearly in the direction of the axis of rotation of the Alignment cylinder 04 is adjustable.

In Fig. 4, the device 02 along the section line I - I of Fig. 1 is shown. On the drive shaft 05 a total of six suction rollers 06 are rotatably disposed to promote the located between the sheet hold-down roller 11 and the feed table 09 sheet 01 in the conveying direction. The drive shaft 05 is rotatably mounted on bearings 28 by means of schematically illustrated roller bearings on the first frame part 24 and can be driven by a drive motor 29 rotationally. The drive motor 29 is also attached to the first frame part 24 and drives synchronously to the drive shaft 05 via a gear 31, the sheet hold-down roller 11 at. Also, the sheet hold-down roller 11 is fixed to the first frame member 24, so that as a result linear movement of the first frame member 24, the drive shaft 05 together with the suction rollers 06, the drive motor 29, the gear 31 and the sheet hold-down roller 11 linearly in the direction of the movement arrow, that is in the direction the axis of rotation of the drive shaft 05 can be moved from a zero position in both directions. To drive the first frame part 24 in the direction of the movement arrow on the second frame part 26, a motor, for. B. linear motor 32, whose linearly driven output shaft acts on the left end of the first frame part 24. By driving the linear motor 32, the first frame part 24 can be moved transversely to the conveying direction of the sheet 01, so that thereby the aligned side edge of the sheet 01 can be aligned in accordance with the previously determined measurement result corresponding to the desired target orientation.

The drive motor 29 for rotational drive of the drive shaft 05 can be controlled and regulated in dependence on predetermined laws of motion, in particular as a function of the angle of rotation of the suction rollers 06. Thus, acceleration, speed or rotation angle of the drive motor 29 can be specified to achieve a desired motion kinematics, so that in particular sheets of different lengths can be conveyed with identical suction rolls and transferred or transferred with the correct pass.

In particular, the leading marks 08 on the circumference of the alignment cylinder 04 with up to +/- 0.35 m / s ^{2 can be} accelerated or braked.

FIG. 5 shows a second embodiment of a device 40. On a driven by a drive motor, not shown drive shaft 41 a total of four suction rollers 42 are mounted spaced apart. At the periphery of the suction rollers 42 two front marks 43 are arranged, which extend slightly over the top 44 of the feed table 46 with a corresponding position of the drive shaft 41. In order to fix the sheets 01 during transport in the device 40 by means of negative pressure frictionally to the suction rolls 42, 42 each suction elements 47 are provided on the inside of the suction rolls, which are fixedly secured to a first frame part 48. The first frame part 48 is corresponding to the Device 02 is mounted linearly displaceable on a second frame part 49 and can be driven transversely to the conveying direction of the sheet 01 by means of a drive motor 51 (FIG. 6) not shown in FIG. The power transmission from the drive motor 51 to the first frame part 48 takes place via a cam gear 52, so that the first frame member 48 together with the drive shaft 41, the suction rollers 42, the feed table 46 and a drive motor, not shown for rotational drive of the drive shaft 51 from a zero position according to the movement arrow 53 linearly transversely to the conveying direction of the sheet 01 can be driven.

In Fig. 6, the embodiment of a device 40 is shown in cross section. Above the suction rolls 42, a sheet hold-down roll 54 is arranged, the outer circumference of which is spirally formed, so that the gap between the sheet hold-down roll 54 and the suction rolls 42 is reduced or increased depending on the rotation angle of the leading marks 43. After fixing the sheet 01 to the suction rollers 43 and during or after the alignment of the side edges of the sheet 01, the sheet 01 are accelerated or decelerated by appropriate drive of the suction rollers 42 so that the sheet 01 fit to a downstream device 56, for example a transfer roller 56, can be transferred.

In Fig. 7 is a sheet system 59 for conveying and aligning sheet 01 with a device 02; 40 shown in perspective. In a frame 61, an alignment cylinder 62 and a transfer roller 63 are arranged one behind the other in the conveying direction of the sheet 01. The alignment cylinder 62 can be rotationally driven by an angle-dependent controllable drive motor 65. The orientation of the side edges of the sheet 01 can be arranged on the input side of the sheet system 59 measuring device 64, z. B. measuring heads 64 are measured. As a result, the sheet feeder 59 serves to align the sheets 01 with respect to their front edge 07 and a side edge and to accelerate the sheets 01 to these ever to pass accurately to length to the downstream transfer roller 63 according to length.

In Fig. 8, the sheet system 59 is shown in perspective from the opposite side.

In Fig. 9 is a section through the sheet system 59 is shown in perspective. It can be seen the feed table 66, on which the sheets are 01 01 flat lying on a scale of the sheet system 59 fed. The alignment cylinder 62 is in turn composed essentially of a drive shaft 67 and two suction rollers 68 mounted on the drive shaft. At the periphery of the suction rollers 68, a plurality of recesses 76 are arranged one behind the other and next to each other, so that a sheet 01 can be sucked for fixing to the suction rollers 68 by means of negative pressure. It can be seen that the recesses 76 begin immediately behind the front marks 69 and extend in the circumferential direction over a rotational angle range of approximately 200 °. It follows as a result that the sheet 01 can be fixed frictionally on the circumference of the suction rollers 68 from 0 ° corresponding to the abutting edge of the front end 69, via a rotation angle of the suction roller 68 of 130 ° to 200 °. A special valve control for switching on or off of the negative pressure is therefore not required. Rather, in the suction chamber permanently negative pressure can be applied, since the sheets 01 are then automatically not fixed to the suction rollers 68 when the closed-trained rotation angle range of the suction rollers 68 is above the suction chamber. The choice of the size of the rotation angle range with recesses is to be determined depending on the sheet size to be processed. On the transfer roller 63, retaining elements 71 are provided for fixing the sheets 01 after transfer, fixing the leading edge of the sheets to the transfer roller 63.

In Fig. 10, the alignment cylinder 62 is shown in the disassembled state. The drive shaft 67 is mounted on three bearing points 72 on a first frame part 73 and can be driven in rotation by means of a drive motor, not shown, arranged at the end 74. The front marks 69 on the suction rolls 68 divide the circumference of the suction rolls 68 into a first region with recesses 76 and into a second region without recesses. The first frame part 73 is mounted in sliding sleeves 77 linearly displaceable in the direction of the axis of rotation of the drive shaft 67 on the frame 61 and can be adjusted with a drive motor 78 transversely to the conveying direction of the sheet 01.

In Fig. 11, the assignment of a sheet 01 to the alignment cylinder 62 during operation of a sheet system 59 is shown. Initially, the leading edge 07 of the sheet 01 is aligned with the leading marks 69 by respective relative speeds between the leading edge 07 and the leading marks 69. Thereafter, the sheet 01 is fixed in the contact area between the suction rollers 68 and the sheet lower side by the recesses 76 reach the area above the suction chamber acted upon by negative pressure. After fixing the sheet 01, a relative movement between the sheet 01 and alignment cylinder 62 is excluded transversely to the conveying direction. For aligning one of the side edges 79 of the sheet 01, the entire first frame part 73 can be adjusted transversely to the conveying direction 81 according to the movement arrow 82 linearly.

Fig. 12 shows the transfer roller 63 with the holding elements 71, a drive shaft 83 and a drive gear 84. The transfer roller 63 is fixed on both sides with bearings 86 on the frame 61.

In Fig. 13, a bow guide 87 for use in the device 59 is shown in the disassembled state. By means of hold-down plates 88, the maximum distance between the sheet 01 and the top of the investment table 66 is limited. The hold-down plates 88 can thereby be raised or lowered in an oscillating manner.

FIGS. 14 to 16 show the alignment of a sheet 01 with respect to its front edge 07 and with respect to the right side edge 79 during the different phases of the conveyance on the alignment cylinder 62.

In the phase shown in FIG. 14, the sheet 01 is conveyed at a conveying speed in the conveying direction 81 which is approximately 20% greater than the peripheral speed of the conveying marks 69 on the circumference of the suction rolls 68.

Subsequently, as shown in Fig. 15, the leading edge 07 of the sheet 01 at the front marks 69 to the system and is thereby braked to the peripheral speed of the suction rollers 68. By braking the front edge 07 to the front marks 69 this is aligned within a short time without the sheet 01 comes to a standstill.

Is the sheet 01 already aligned with respect to its leading edge 07 in the correct position. At this time, the not visible below the sheet 01 recesses 76 arrive at the suction rollers 68 in the region under negative pressure above the suction elements 47. As a result, the sheet 01 is sucked and fixed to the circumference of the suction rollers 68.

If the sheet 01 after the orientation of the leading edge 07 by continuous rotational drive of the suction rollers 68 in the conveying direction 81 further promoted. The sheets 01 remain even during the promotion by the suction rollers 68 surface on the feed table 66, which is formed in the region above the suction rollers 68 by a three-piece plate 89, lie. At about this time, the position of the right side edge 79 is measured by means of the measuring head 64, not shown. At the same time, the motor 78 begins to accelerate to drive the drive shaft 67 to bring the sheet 01 to the desired conveying speed in the conveying direction 81.

Will the bow 01 during a next phase of promotion. It can be seen that the leading edge 07 has almost reached the trailing edge of the plate 89. To align the side edge 79 according to a desired desired position of the feed table 66 was moved together with the underlying first frame member 73, the drive shaft 67 and the suction rollers 68 in the direction of the movement arrow 82 transverse to the conveying direction 81 of the sheet 01. The travel 91 by which the sheet 01 has been displaced transversely to the conveying direction 81 in the direction of the axis of rotation of the drive shaft 67 together with the moving components is apparent from the edge offset between the feed table 66 and the support 92 in the region of the transfer roller 63.

FIG. 17 shows, in three diagrams, the path, the speed and the acceleration of the suction roll circumference over the rotation angle. In a first phase P1, the peripheral speed is kept constant. During this phase P1, the leading edges 07 of the sheets 01 engage the front marks 69 and are thereby aligned. At the end of the phase P1, the sheet 01 is aligned with respect to its leading edge 07 and is fixed by applying a negative pressure to the suction roll 68.

In the subsequent phase P2, the suction rolls 68 and thus the sheet 01 adhering thereto are accelerated in such a way that the sheets 01 have a speed corresponding to the peripheral speed of the transfer roll 63 until the time of transfer to the downstream transfer roll 63. In phase P3, this speed is again kept constant in order to allow a clean transfer of the sheets 01 to the transfer roller 63. As soon as the sheets 01 are fixed on the transfer roller 63, the sheets 01 are released from the suction roller 68 in that no recesses 76 are provided on the circumference of the suction roller 68 at the corresponding angle of rotation. Partially at the same time as the drive in the conveying direction 81, the sheets 01 are moved transversely to the conveying direction 81 during the phases P2 and P3, in order thereby to produce a side edge 79 corresponding to one align desired target alignment. At the end of the phase P3, the sheet 01 is completely detached from the suction rolls 68 and is now driven by the downstream transfer roll 63. During the subsequent phase P4, the drive shaft 67 must be driven such that the circumferential speed of the suction rollers 68 after a full rotation, ie after 360 °, straight again corresponds to the Zufördergeschwindigkeit the sheet 01 from the shingling device. As can be seen from Beschteunigungs- or speed diagram, it may be necessary to decelerate the suction rollers 68 up to zero speed and to drive against the direction required for the promotion of the bow 01 direction of rotation. Starting from the largest negative acceleration, the suction rollers 68 are then just accelerated so that the circumferential speed after a full revolution just the desired peripheral speed for clean acquisition of the sheet 01 from the shingling device corresponds.

Fig. 18 shows the travel, the speed and the acceleration of the suction rollers 68 transversely to the conveying direction 81 during one revolution. The diagrams assume a maximum travel of 5 mm from the zero position. During a first phase Q1 no transverse movements are performed. In this phase Q1, the position of the aligned side edge 79 is measured with the measuring device. In the subsequent phase Q2, the suction rollers 68 are accelerated transversely to the conveying direction 81 and then decelerated again until the suction rollers 68 have traversed a travel of 5 mm measured transversely to the conveying direction 81 of the sheet 01. At the end of the phase Q2 corresponds to the actual position of the aligned side edge 79 of the desired target orientation. In the subsequent phase Q3 there is thus no further adjustment movement of the sheets 01 transversely to the conveying direction 81 of the sheets 01, so that the sheets 01 can easily be transferred to the downstream transfer roll 63 in this phase Q3. In the subsequent phase Q4, the suction rollers 68 are driven together with the drive shaft 67 so that at the latest after one revolution, the zero position is reached again.

FIG. 19 shows a device 101 for measuring the position of the side edge 79 of a sheet 01, as may be used, for example, in a sheet feeder 59 as shown in FIG. 7. In the device 101, two measuring heads 64 are provided, with each of which the position of a side edge 79 of a sheet 01 can be determined. Depending on the position of the side edge 79, a correlating measuring signal is emitted by the measuring heads 64, which can be evaluated in a system control. The side edge 79 of the sheet 01 to be measured must each be arranged such that the measuring head 64 is positioned above and below the side edge 79. The measurement itself is based on an optical system with the aid of light beams, as described for example in EP 07 16 287 A2. Of course, however, any other measuring method, in particular non-contact measuring methods, can also be used. In order to set up the measuring heads 64 in accordance with the processing of different widths sheet 01, the measuring heads 64 are mounted transversely to the conveying direction 81 of the sheet 01 linearly along the movement arrows 102 and 103, respectively. For this purpose, the measuring heads 64 are each mounted on slides 104, each in a linear guide, not shown, between the plates 106; 107 can be moved. The carriages 104 are in this case via a gear arrangement (not shown in FIG. 19) from one below the plates 106; 107 arranged drive motor 108 driven. To ensure trouble-free transport of the sheet 01 on the top of the plates 106; 107, the gap between the plates 106; 107, which is required for the carriage 104, closed by a respective cover 109. The top of the cover 109 extends in the plane, namely the sheet plane, by the flat resting the sheet 01 on the plates 106; 107 is defined.

Fig. 20 shows the device 101 in a perspective view from below. It can be seen in particular the drive motor 108, which transmits 111 positioning movements on two drive wheels 112 via a toothed belt. For tensioning the toothed belt 111, a tension roller 113 is provided. The two toothed racks 114 are driven by the drive wheels 112 via two drive pinions 121 (FIG. 22), which are connected in a rotationally fixed manner to the drive wheels 112 and not shown in FIG. 20, wherein both toothed racks 114 are each connected to a carriage 104 of a measuring head 64. The drive wheels 112 and the associated drive pinion 121 are each fixed by a bracket 115 fixed to the frame 106 or 107 on the plates.

Fig. 21 shows the device 101 in a side view from behind. The toothed racks 114 are fastened to the carriage 104 in such a way that the toothing comes into engagement with respectively opposite sides of the drive pinions (not shown in FIG. 21). It follows that a linear adjusting movement of the toothed belt 111, for example, according to the movement arrow 116, oppositely directed adjusting movements of the measuring heads 64 corresponding to the movement arrows 117; 118 causes. The same applies of course to an opposite adjusting movement of the toothed belt 111, with which the measuring heads 64 can be moved apart.

Fig. 22 shows the device 101 in a side view from one side. The carriage 104 is linearly displaceable in a formed by two grooves linear guides 119 on the plates 106; 107 stored. On the top of the carriage 104, the measuring head 64 is attached, which serves as an electronic side mark. The carriage 104 is driven by the rack 114, whose teeth mesh with a drive pinion 121. The drive pinion 121 in turn is non-rotatably connected to the drive wheel 112 which is driven by the drive motor 108 via the toothed belt 111.

FIG. 23 shows a longitudinal section through the device 101. In this case, once again the drive of the measuring heads 64 with the drive motor 108, the toothed belt 111, the drive wheels 112, the drive pinion 121 and the mirror-offset racks 114 can be seen. Furthermore, a cover element 109 associated with the measuring heads 64 is shown in FIG. The cover elements 109 are formed like a chain and thus elastically deformable in the direction of its longitudinal axis. The respective outer end of the cover elements 109 is attached to a respective carriage 104 and can thus be moved together with the measuring head 64 by driving the drive motor 108. If the measuring heads 64 are moved towards one another from their maximally spaced position, it is necessary to divert the cover elements 109 downwards in sections from the sheet plane in which the sheets 01 are transported in a flat manner. For this purpose, in the device 101 for both cover elements 109 each two holding plates 122; 123 are provided, which are arranged opposite to each other and serve as guide means for each cover 109. On the inside of the holding plates 122; 123 are each complementary shape grooves 124 incorporated extending from the linear linear guide 119 arcuate downward. By the grooves 124, the cover members 109 are deflected when moving the opposite slide 104 down so that thereby the cover 109 can be shortened or extended in each case according to the position of the carriage 104 in the sheet plane.

FIG. 24 shows the arrangement for driving the measuring heads 64 by means of the drive motor 108 without the cover elements 109 and the plates 106 and 107, respectively.

FIGS. 25 to 27 show enlarged sections of the drive device for the carriages 104 and measuring heads 64, respectively.

FIGS. 28 to 31 show a coupling consisting of the coupling parts 130, 131, 144 for transmitting a drive torque to an axially adjustable drive shaft 67 or its essential individual parts. Such a coupling 130, 131, 144 can be used in particular to the drive torque of a drive motor on the axially adjustable alignment cylinder of a device 02; 40; 101 to transmit. By using such a coupling 130, 131, 144, it becomes possible to drive the motor to mount fixedly to the rotational drive of the alignment, so that the mass to be accelerated in the adjusting movement for aligning the side edge 79 is reduced.

The coupling 130, 131, 144 is composed essentially of three parts, which are shown in Figs. 28 to 30. The first coupling part 130, 131 is composed of two coupling parts 130 (FIG. 28) and 131 (FIG. 29). Both coupling parts 130; 131 each have recesses 132; 133; 134, which is slightly larger than the diameter of the associated shaft 67, for example, the drive shaft 67 of the alignment cylinder 62. On the inside of the recesses 132; 133; 134 each keyway grooves 136, 137 and 138 are provided, which are arranged with a arranged on the drive shaft 67, not shown keyway momentarily engageable. For stationary fixation of the first coupling part 130, this has a slit 139, so that the first coupling part 130 by means of tightening a clamping screw, not shown in the thread 141 frictionally engaged on the associated drive shaft 67 can be fastened. As shown in Fig. 29, disposed on the associated drive shaft 67 end of the second coupling part 131 is fork-shaped with two arms 142 and 143, wherein the recesses 133; 134 are aligned with each other on the arms 142 and 143 are attached. The distance between the arms 142 and 143 is chosen so that the plate-shaped coupling part 130 with the arranged on the associated drive shaft 67 end between the arms 142; 143 can be arranged axially backlash.

In Fig. 30, a second coupling part 144 is shown, which can cooperate in the transmission of torque with a composite of the coupling parts 130 and 131 first coupling part 130, 131. The coupling part 144 has a crank, so that the radially outer end 146 of the second coupling part 144 projects beyond the end 147 of the associated shaft 148. On the first coupling part 130, 131 side facing the radially outer end 146 is the second coupling part 144 fork-shaped and extends with two arms 149 and 151 in the direction of the first coupling part 130, 131. On the arms 149 and 151 and on an oppositely disposed abutment 152 each axle bearing 153 are mounted, in which the axes of rotation of rolling elements 154 (FIG. 31) can be fastened. The axle bearings 153 are arranged so that the rotation axis 156 parallel to the outer sides 157; 158 of the coupling parts 130; 131, which engage with the rolling elements 154, extend.

The function of the coupling 130, 131, 144, which consists of the second coupling part 144 and the coupling part 130 and 131 composed of the first coupling part 130, 131 is illustrated by Fig. 31. After installation of the coupling parts 130 and 131 on the one shaft end and the second coupling part 144 on the opposite end of the shaft are the outer sides 157; 158 of the coupling parts 130; 131 on the inside of the rolling elements 154 at. By tightening the clamping screw on the coupling part 130, the coupling part 130 is fixed in place and fixed the coupling member 131 due to the arrangement between the arms 142 and 143 axially on the shaft end. The feather key grooves 137; 138 of the second coupling part 131 are slightly wider than the feather key piece on the drive shaft 67, so that the second coupling part 131 can be at least slightly rotated on the drive shaft 67. Between the radially outer ends 146 of the coupling parts 130; 131, a spring element 159 is arranged, which elastically braces the coupling part 131 against the coupling part 130 and spreads apart the two coupling parts 130 and 131, respectively. As a result, a resilient backlash-free seat of the outer sides 157 and 158 is ensured at the rolling elements 154 at any time.

If a torque is now applied to one of the opposing drive shafts 67, the torque is transmitted by positive engagement between the rolling elements 154 and the outer ends of the coupling parts 130 and 131. A knocking out of the coupling 130, 131, 144, in particular with frequent change of the direction of rotation, is Due to the elastic tension of the two coupling parts 130 and 131 largely excluded.

If one of the drive shaft 67 is displaced axially in the direction of its axis of rotation relative to the opposite shaft, then the outer sides 157 roll; 158 on the rolling elements 154, so that an axial adjustment is possible without resistance even under load substantially.

In Fig. 32 and Fig. 33, the use of a coupling 130, 131, 144 with the coupling parts 130 and 131, and the second coupling part 144 in a sheet system 59 is shown in top view.

In the phase shown with FIG. 32, a sheet 01 has just reached the leading marks 69 on the suction rolls 68, so that the front edge 07 of the sheet 01 is aligned. The feed table 66, which is adjustable axially together with the suction roller 68 and the drive shaft 67 in the direction of the axis of rotation of the drive shaft 67, is in its zero position in this phase and can be adjusted according to the movement arrow 161 to the right and left by a linear drive, not shown ,

The drive torque required for driving the drive shaft 67 and thus for conveying the sheet 01 is generated by a drive motor 162 and transmitted via the second coupling part 144 and the coupling parts 130 and 131 to the drive shaft 67.

In FIG. 33, the sheet feeder 59 is shown in a later process phase, to which the sheet 01 for aligning one of its side edges 79 has already been moved transversely to the conveying direction 81. The required alignment movement is directed in the illustration of Fig. 35 to the right, which in particular from the edge offset 163 between the outer edge of the feed table 66 and the outer edge of the subsequent device is recognizable. Together with the feed table 66 and the drive shaft 67 with the coupling parts mounted thereon 130 and 131 is axially adjusted in the direction of the axis of rotation of the drive shaft 67.

During the axially directed adjusting movement for aligning the side edge 79 of the sheet 01, the drive motor 162 was driven by an angle of about 90 ° to drive the sheet 01 in the conveying direction 81. The compensation of the axial offset of the drive shaft 67 relative to the drive motor 162 is made possible by rolling the coupling parts 130 and 131 on the rolling elements 154.

LIST OF REFERENCE NUMBERS

01

bow

02

contraption

03

Device, transfer cylinder, downstream

04

alignment cylinder

05

drive shaft

06

suction roll

07

Leading edge (01)

08

front lay

09

feed table

10

-

11

Bow down roller

12

recess

13

Down plate

14

intake area

15

-

16

Tangent plane (11)

17

Top (09)

18

arc plane

19

Tangent plane (04)

20

-

21

suction

22

suction chamber

23

Recess (04)

24

Frame part, first

25

-

26

Frame part, second

27

linear guide

28

depository

29

drive motor

30

-

31

transmission

32

linear motor

33 to 39

-

40

contraption

41

drive shaft

42

suction roll

43

front lay

44

Top (46)

45

-

46

feed table

47

suction

48

Frame part, first

49

Frame part, second

50

-

51

drive motor

52

Cam gear

53

movement arrow

54

Bow down roller

55

-

56

Device, transfer roller, downstream

57

-

58

-

59

sheet feeder

60

-

61

frame

62

alignment cylinder

63

transfer roller

64

Measuring device, measuring head

65

drive motor

66

feed table

67

Shaft, drive shaft

68

suction roll

69

front lay

70

-

71

retaining element

72

location location

73

Frame part, first

74

End (67)

75

-

76

Recess (68)

77

sliding sleeve

78

drive motor

79

Side edge (01)

80

Conveying direction (01)

81

82

movement arrow

83

Drive shaft (63)

84

-

85

-

86

Bearings (63)

87

bowing

88

Down plate

89

plate

90

-

91

Travel Range

92

edition

93 to 100

-

101

contraption

102

movement arrow

103

movement arrow

104

carriage

105

-

106

plate

107

plate

108

drive motor

109

cover

110

-

111

toothed belt

112

drive wheel

113

idler

114

rack

115

hanger

116

Motion arrow (111)

117

Motion Arrow (64)

118

Motion Arrow (64)

119

linear guide

120

-

121

pinion

122

Retaining plate

123

Retaining plate

124

groove

125 to 129

-

130

Coupling part, first

131

Coupling part, second

132

recess

133

recess

134

recess

135

-

136

keyway

137

keyway

138

keyway

139

slitting

140

-

141

Thread (130)

142

Arm (131)

143

Arm (131)

144

Coupling part, second

145

-

146

End, radially outer (144)

147

End (148)

148

wave

149

Arm (144)

150

-

151

Arm (144)

152

thrust bearing

153

Achslager

154

rolling elements

155

-

156

axis of rotation

157

outside

158

outside

159

spring element

160

-

161

movement arrow

162

drive motor

163

Misalignment

P1

Phase, first

P2

Phase, second

P3

Phase, third

P4

Phase, fourth

Q1

Phase, first

Q2

Phase, second

Q3

Phase, third

Q4

Phase, fourth

Claims (18)

1. An apparatus for the alignment of sheets (01) with an alignment cylinder (04), wherein a sheet-holding-down roller (11; 54) is arranged in a manner cooperating with the alignment cylinder (04), characterized in that the sheet-holding-down roller (11; 54) is in the shape of a spiral in cross-section.
2. An apparatus according to Claim 1, characterized in that the sheet-holding-down roller (11) is driven so as to rotate in synchronism with the alignment cylinder (04).
3. An apparatus according to Claim 2, characterized in that the external periphery of the sheet-holding-down roller (11) is in the shape of a spiral.
4. An apparatus according to Claim 1 or 3, characterized in that the sheet-holding-down roller (11) is driven in such a way that during the alignment of the front edge (07) of a sheet (01) the maximum diameter of the sheet-holding-down roller (11) in the shape of a spiral can come to rest against the sheet (01) in each case.
5. An apparatus according to any one of Claims 1 to 4, characterized in that recesses (12) for receiving the front lay marks (08) of the alignment cylinder (04) without contact are provided on the periphery of the sheet-holding-down roller (11).
6. An apparatus according to any one of Claims 1 to 5, characterized in that the sheet-holding-down roller (11) is vertically adjustable at least slightly relative to the alignment cylinder (04).
7. An apparatus according to any one of Claims 1 to 6, characterized in that the feeder table (09) is vertically adjustable at least slightly relative to the alignment cylinder (04).
8. An apparatus according to any one of Claims 1 to 6, characterized in that the tangential plane (19) on the alignment cylinder (04), in the contact region between the alignment cylinder (04) and the sheet (01), extends at a slight distance parallel to the top (17) of the feeder table (09).
9. An apparatus according to any one of Claims 1 to 8, characterized in that the tangential plane (16) on the sheet-holding-down roller (11), measured while passing the maximum radius of the sheet-holding-down roller (11), extends at a slight distance parallel to the top (17) of the feeder table (09).
10. An apparatus according to any one of Claims 1 to 9, characterized in that a holding-down plate (13), by which the distance between the sheet (01) and the feeder table (09) is capable of being bounded at least in part, is provided in the apparatus (02) above the feeder table (09).
11. An apparatus according to Claim 10, characterized in that the distance between the holding-down plate (13) and the feeder table (09) is capable of being altered in a manner dependent upon the rotational angle of the alignment cylinder (04).
12. An apparatus according to Claim 11, characterized in that the distance between the holding-down plate (13) and the feeder table (09) is capable of being altered in an oscillating manner during one revolution of the alignment cylinder (04) in each case, wherein the distance during the alignment of the front edge (07) of the sheet (01) on the front lay marks (08) is reduced to a minimum distance, in particular to a distance which corresponds to approximately four times the thickness of the sheet (01), and wherein the distance during the further conveying of the sheet (01) is increased to a maximum distance by the alignment cylinder (04).
13. An apparatus according to any one of Claims 1 to 12, characterized in that at least the alignment cylinder (04) and/or the first drive motor (29) and/or the feeder table (09) is or are mounted on a first frame part (24), wherein the first frame part (24) is mounted, so as to be axially adjustable in the direction of the axis of rotation of the alignment cylinder (04), on a second frame part (26) capable of being mounted in a fixed manner with respect to the stand and is capable of being driven by means of the transverse adjustment device.
14. An apparatus according to Claim 13, characterized in that the first frame part (24) is designed in the manner of a roller-mounted linear unit.
15. An apparatus according to Claim 13 or 14, characterized in that the first frame part (24) is capable of being driven in a linear manner by a second linear motor (32) in the direction of the axis of rotation of the alignment cylinder (04).
16. An apparatus according to any one of Claims 13 to 15, characterized in that at least one gear mechanism, in particular a ball screw and/or a cam-disc mechanism (52) and/or a planetary gear mechanism, is provided for power transmission between the second drive motor (51) and the first frame part (48).
17. An apparatus according to any one of Claims 1 to 16, characterized in that the transverse adjustment device is designed in such a way that the alignment cylinder (04) is capable of being accelerated or braked by up to +/- 15 m/s² in a linear manner in the direction of the axis of rotation of the alignment cylinder (04).
18. An apparatus according to any one of Claims 1 to 17, characterized in that the transverse adjustment device (32) is designed in such a way that the alignment cylinder (04) is capable of being adjusted from a zero position by up to +/- 8 mm in a linear manner in the direction of the axis of rotation of the alignment cylinder (04).

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