EP0908314B2 - Control device for the sheet conveying system in a rotary sheet printing press - Google Patents

Abstract

The sheet handler in a printer is controlled by a cam follower comprising a roller (3) at the end of a pivot arm (2) displaced by a cam profile (4) on the print roller. For a positive tracking, without bounce, the pivot arm is linked to a control arm (7), via a pivot (6) and with the end of the control arm linked to the free end of a second pivot arm (13) which is spring loaded (12). The pivot (1) of the first lever can be the suction lifter for the sheets, or can control the axis of the lifting cylinder for the sheets.

Description

The invention relates to a control device for a sheet transport system in a sheet-fed rotary printing press according to the preamble of the main claim.

A device of this type is known for example from DE-PS 934 770. The sheet transport system is designed here as a gripper arrangement for a printing cylinder and regulates the gripper pressure at the sheet leading edge, taking into account the tensile load. The gripper assembly consists essentially of a gripper shaft with a roller lever which rotates on a control cam. The gripper shaft is additionally loaded positively in the gripper closing direction by means of a compression spring arranged on a rod. By means of cam control, the gripper shaft is opened against the spring force. In a further development, the spring force can remain unchanged or reduced, in which the compression spring-carrying rod is extended and is paired gearbox with a hinged lever on the cylinder and rollers with an additional cam control.
The disadvantage here is that the forces acting on the cam gear in the first training forces promote wear and promote the lifting of the roller lever of the control cam in the worst case. The second training is complicated because an additional cam with lever and roller is required. Furthermore, a lot of space is required as a result of the passage of the rod through the cylinder axis, which complicates the use of this solution for multiply large pressure cylinder (based on a single-sized cylinder shape).

Another control device is known from EP 0 452 721 B1. The sheet transport system is designed here as a suction system in a sheet transfer drum for turning the sheet, which is in operative connection with two downstream, mutually oscillating gripper systems for turning the sheet on the principle of trailing edge turning.

According to DE 43 39 388 A1 a control device for grippers in turning drums is known. On a gripper shaft a gripper shaft lever is arranged, which carries a cam roller at the end. The force-loaded by a tension spring cam roller is paired with a curved path. The cam track is integrated inside a roller lever end and the cam roller protrudes into the roller lever in order to form the cam joint with the curved path. The roller lever has a pivot point and carries at the end facing away from the curved track further a role, which paired with a control cam forms another curve joint. The roller lever is in addition with a compression spring in functional connection, which performs the role frictionally on the control cam.

Since during the movement of deratiger facilities a preferably non-positive Zwanglaufsicherung is required for curved joints, it is disadvantageous that the power pairing between control cam (cam member) and roller lever (engaging member) are subject to ever-changing loads. In sheet transport systems, such as rotating sheet guiding cylinders and swinging pregrippers, it is known, especially at higher machine speeds (for example> 10,000 sheets / hour), that the force pairing in the cam joint is partially canceled out by additional inertial forces, for example centrifugal forces. On the other hand, constant erratic load change reactions promote the wear of the cam mechanism designed as a control device. This has a negative effect on the print quality.

The invention is based on the object to provide a control device of the type described above, which avoids the disadvantages mentioned, which in particular allows a safe forced running in the curve joint and noticeably reduces the load change reactions within the device.

According to the invention the object is achieved by the training features of the main claim. Further developments emerge from the subclaims.

The control device according to the invention relates to a sheet transport system, which can be used in rotating sheet guiding cylinders, such as printing cylinders, transfer drums and turning devices, investment drums and oscillating pregrippers. The sheet transport system is advantageously formed by a plurality of arranged on a gripper shaft grippers or a pneumatically actuated sheet holding system, such as a sucker shaft with corresponding suction systems. In a further development, the sheet transport system can also be used as a vibrating system for recto printing and / or counterpressure grippers and / or suction cups.
The control device for the sheet transport system is suitable for sheet-fed rotary printing presses, which are operable exclusively in Perfecting as well as switchable in Perfecting - or perfecting.
In known manner, the control shaft (gripper shaft or suction shaft) of the sheet transport system with a roller lever with roller, which is paired with a curve coupled. The control shaft is gear technology a rotary joint with a pivot point. The pivot point - as stated above - is not limited to a control shaft.

The roller lever corresponds to transmission technology of a curve rocker and is geared technically connected to an energy storage with the interposition of a frame-fixed rocker and a coupling, such that the forced running in by roller and curve secured curve joint is secured. Under forced backup is the constant contact of role (engaging member) and curve (cam member) to understand in the curve joint, as during the movement curve and engaging member must be constantly in touch.
The Zwanglaufsicherung is achieved by power pairing, which is generated by an energy storage, advantageously in the form of a spring system, alternatively by a hydraulic or pneumatic element.
Moreover, the cam follower of the control device is coupled with other means, so that the force pairing in the cam joint to achieve a more even forced running of the cam member and engaging member is not subject to sudden load change reactions. The force field in the control device is improved to the effect that the forces acting on the gear members outside of the swivel joints, following the curve law, are at a defined level.

Fig. 1

das kinematische Schema einer Steuereinrichtung

Fig.2

die Steuereinrichtung für einen Bogenführungszylinder

Fig. 3

eine Bogenrotationsdruckmaschine (in Teilansicht)

Fig. 4

die Steuereinrichtung gem. Fig. 2 im Kurventiefstpunkt

Fig. 5

die Steuereinrichtung gem. Fig. 2 im Kurvenhöchstpunkt

The invention will be explained in more detail using an exemplary embodiment. Here are shown schematically:

Fig. 1

the kinematic scheme of a control device

Fig.2

the control device for a sheet guiding cylinder

Fig. 3

a sheet-fed rotary printing press (in partial view)

Fig. 4

the control device acc. Fig. 2 in the curve low point

Fig. 5

the control device acc. Fig. 2 in the highest curve

A multi-color offset printing machine has gem. Fig. 3 on several arranged in series construction printing units 16. Each printing unit 16 has a plate cylinder 21, a blanket cylinder 22 and a printing cylinder 25. On the inking unit and possibly the dampening unit will not be discussed here. Between the printing units 16 at least one turning drum 23 and transfer drums 24 are arranged for the sheet to be processed in the conveying direction 18 for the sheet transport. The last printing unit 16 is a boom 20 with a plurality of gripper systems supporting, circulating Kettensytem 19 downstream in a conventional manner. The transfer drums 24 and turning drums 23 and the boom 20 are sheet guiding devices 17 in a modular design lined up with as uniform as possible guide surface assigned.

The control device according to the invention is shown in Fig. 1 generally for a sheet guiding cylinder. The kinematic scheme shows a hinge 1, which is arranged gear frame fixed to the sheet guiding cylinder. Fixed frame is hereby the rotating sheet guiding cylinder, for example in the form of a printing cylinder 25, a turning drum 23, a transfer drum 24, a collision drum or a vibrating pre-gripper system (the latter not shown) to understand.

At the pivot 1 a curve rocker 2 is articulated end, which carries at the free end with a fixed curve 4 operatively connected roller 3. At the curve rocker 2, a rotary joint 6 is arranged, which is connected to a coupling 7.
Alternatively, the rotary joint 6 (with articulated coupling 7) can also be arranged in the axis of rotation of the roller 3.
The coupling 7 is further connected to a arranged on a separate rocker pivot 13 8. The coupling 7 is thus geared a binary member with two pivot joints 6, 8. The rocker 13 is a frame-fixed pivot 10 is arranged on the sheet guiding cylinder and has between the swivel joints 8, 10, a further rotary joint 9.
Alternatively, the rotary joint 9 can also be arranged in the axis of rotation of the rotary joint 8.
The rotary joint 9 is coupled to an energy store 12, the energy store 12 being arranged in a frame-fixed pivot 11 on the sheet guiding cylinder. All hinges 1, 6, 8, 9, 10, 11 each have a joint degree of freedom of f = 1.
The rocker 13 is alternatively executable as an angle lever and thus is a ternary member with the three hinges 8, 9, 10th

• das Drehgelenk 1 ist eine am Druckzylinder gelagerte Greiferwelle mit einer Mehrzahl von Greifern,
• die Kurvenschwinge 2 (mit Rolie 3) ist seitlich an der Greiferwelle als Rollenhebel angeordnet,
• die Kurve 4 ist eine Steuerkurve, welche über die Rolle 3 und Rollenhebel (Kurvenschwinge 2) die Öffnungs- bzw. Schließbewegung der Greifer auf der Greiferwelle (Drehgelenk 1) steuert,
• die Koppel 7 ist eine Stange oder ein äquivalentes Zugmittel, welches am Drehgelenk 6 des Rollenhebels (Kurvenschwinge 2) und am Drehgelenk 8 der Schwinge 13 endseitig angelenkt ist,
• die Schwinge 13 ist ein Hebel, der im am Druckzylinder 25 gestellfesten Drehgelenk 10 angeordnet ist und auf einer Strecke zwischen den Drehgelenken 8, 10 ein weiteres Drehgelenk 9 aufweist (Fig. 1, 2) oder ist ein Winkelhebel mit drei Drehgelenken 8, 9, 10 als ternäres Glied (nicht gezeigt),
• das Drehgelenk 9 ist ein erster Kraftangriffspunkt des Energiespeichers 12.
• der Energiespeicher 12 ist bevorzugt ein Federsystem, welches einen weiteren Kraftangriffspunkt im Drehgelenk 11 aufweist, wobei das Drehgelenk 11 gestellfest am Druckzylinder 25 angeordnet ist.

In a first embodiment, the control device according to FIG. 1 is arranged on a pressure cylinder 25 with center 5. The kinematic scheme corresponds to the following formed transmission organs:

• the rotary joint 1 is a gripper shaft mounted on the printing cylinder with a plurality of grippers,
• the curve rocker 2 (with Rolie 3) is arranged laterally on the gripper shaft as a roller lever,
• the curve 4 is a control cam which controls the opening and closing movement of the grippers on the gripper shaft (rotary joint 1) via the roller 3 and roller lever (curve rocker 2),
• the coupling 7 is a rod or an equivalent traction means, which is articulated on the pivot 6 of the roller lever (curve rocker 2) and the pivot 8 of the rocker 13 end,
• the rocker 13 is a lever which is arranged in the frame fixed to the pressure cylinder 25 pivot 10 and on a distance between the hinges 8, 10 another pivot joint 9 (FIG. 1, 2) or is an angle lever with three hinges 8, 9, 10 as a ternary member (not shown),
• the rotary joint 9 is a first point of force application of the energy store 12.
• the energy storage 12 is preferably a spring system, which has a further force application point in the rotary joint 11, wherein the rotary joint 11 is arranged fixed to the frame on the pressure cylinder 25.

Alternatively, the gripper shaft described for the rotary joint 1 can be substituted with a roller lever by a suction shaft with roller lever.

• das Drehgelenk 1 einer fixierten Drehachse an der Wendetrommel 23,
• die Kurvenschwinge 2 (mit Rolle 3) einer auf der o. g. Drehachse des Drehgelenkes 1 schwenkbar gelagerten Platte, die eine Doppelfunktion:
  • 1. ais Rollenhebel und
  • 2. als Steuerkurve für Schwingsysteme, insbesondere für Schöndruck- und Widerdruckgreifer besitzt, wobei die Steuerkurve durch zwei Kurvenäste 14, 15 gebildet ist und die Rolle 3 wiederum mit der Kurve 4 gepaart ist, welche die Schwenkbewegung der Platte um die Drehachse (Drehgelenk 1) steuert und die Kurvenäste 14, 15 mit weiteren Rollenhebeln (mit Rolle) Kurvengelenke für Schöndruck-bzw. Widerdruckgreifersysteme bilden,
• die Drehgelenke 6,8 sind Anlenkpunkte der als Stange ausgebildeten Koppel 7,
• die Schwinge 13 ist ein im gestellfesten Drehgelenk 10 der Wendetrommel 23 angeordneter Hebel, welcher um die Achse des Drehgelenkes 10 schwenkbar ist,
• das Drehgelenk 9 ist der Anlenkpunkt des Energiespeichers 12, der hier als Federsystem ausgebildet ist,
• das an der Wendetrommel 23 gestellfeste Drehgelenk 11 ist die Drehachse und Kraftangriffspunkt für den Energiespeicher 12 bzw. das Federsystem.

In a second embodiment, which is not part of the protection of claims 1 to 8, the control device of FIG. 2 is arranged on a turning drum 23 with center 5 and relates to a sheet-fed printing press operable in straight printing and perfecting. Where:

• the rotary joint 1 of a fixed axis of rotation on the turning drum 23,
• the curve rocker 2 (with roller 3) a pivotally mounted on the above-mentioned axis of rotation of the rotary joint 1 plate, which has a dual function:
  • 1. ais roller lever and
  • 2. As a control curve for oscillating systems, in particular for Perfecting and reverse pressure gripper has, wherein the control cam is formed by two curve branches 14, 15 and the roller 3 is in turn paired with the curve 4, which the pivotal movement of the plate about the axis of rotation (pivot 1) controls and the curve branches 14, 15 with other roller levers (with roller) curve joints for Perfecting resp. Form back pressure gripper systems,
• the hinges 6,8 are articulation points of the coupling formed as a rod 7,
• the rocker 13 is a fixed to the frame pivot 10 of the turning drum 23 lever which is pivotable about the axis of the rotary joint 10,
• the hinge 9 is the point of articulation of the energy store 12, which is designed here as a spring system,
• the frame on the turning drum 23 fixed pivot 11 is the axis of rotation and force application point for the energy storage 12 and the spring system.

The law of motion of the curve 4 is known to provide the highest and lowest points on the cam member in order to realize the desired: time-expiring, periodic movements. Gearbox form roller 3 and curve 4 at the mating a curve joint, the roller 3 is frictionally secured by the energy storage 12, for example, a spring system with compression spring or tension spring in their forced operation.
A defined force for the forcible securing of roll 3 and curve 4 in the curved joint is maintained with the control device according to the invention essentially over the entire law of motion.
It is realized by the fact that the rocker 13 mounted on the turning drum 23 fixed to the frame in the rotary joint 10 has two rotary joints 8, 9. The rocker 13 compensates for the forces resulting from the law of motion of the curve 4 and usually causing load change reactions by the swinging movement of the rocker 13 about the pivot 10, the lever ratios and the force ratios and thus change the moments.

4, the rocker 13 is shown pivoted about the axis of rotation of the rotary joint 10 when the cam joint (roller 3, curve 4) occupies approximately the lowest point on the cam body of the curve 4. This corresponds to the position shown in FIG. 2 with solid lines. In the direction of force of the energy accumulator 12, a force F ₁ acts, which with a lever arm I ₁ (solder from the pivot point 10 on the force direction F ₁ ) results in the moment M ₁ . Furthermore, acts on the coupling 7, a force F ₂ , which with a lever arm I ₂ (Lot of the pivot point pivot 10 on the direction of force F ₂ ) results in the moment M ₂ .
The rocker 13 with hinges 8, 9 is formed with the lever arms I ₁ , I ₂ such that at the lowest point of the cam (curve 4) for the lever ratios applies: I ₁ > I ₂ .

According to Fig. 5, the rocker 13 is pivoted about the axis of rotation of the pivot 10 in the position shown when the cam joint (roller 3, curve 4) approximately the highest point on the cam body (curve 4) occupies. This corresponds to the position shown in dashed lines in Fig. 2. In the direction of the energy accumulator 12, a force F ₁ ', which results in a moment arm M ₁ ' with a lever arm I ₁ ', acts. At the coupling 7 acts a force F ₂ ', which results with a lever arm I ₂ ' the moment M ₂ '. At the highest point of the cam (curve 4), the following applies for the lever ratios: I ₁ '<I ₂ '.

By the pivotal movement of the rocker 13 about the axis of rotation (pivot 10) and thus change the forces F ₁ , F ₂ , F ₁ ', F ₂ ' and the lever arms I ₁ , I ₂ , I ₁ ', I ₂ ' are the moments M ₁ , M ₂ , M ₁ ', M ₂ ' compensated such that there is always a force of defined size in the cam joint of roller 3 and curve 4, wherein the pivotal movement and thus change in the lever ratios of the rocker 13 in conjunction with the curve law the curve 4 takes place. According to the design of the lever arms on the rocker 13 is the contact force of the roller 3 in the cam joint At the highest and lowest points of the cam body approximately equal or preferred is the contact force of the roller 3 in the deepest curve point greater than the highest curve point, in which case the levers I ₁ > I ₂ at the lowest curve point and I ₁ '<I ₂ on the rocker apply at the highest curve point.
The control device is not limited to a sheet guiding cylinder with simply large diameter ßem, based on a single-size forme cylinder. Rather, the device is also suitable for multiple-sized sheet guiding cylinder. For example, in a double-sized sheet guiding cylinder, the control means offset by 180 ° symmetrically and mutually mirror-image on the cylinder circumference anordbar.

The operation is as follows: In the first embodiment of a sheet guiding cylinder, in particular a pressure cylinder 25, the curve 4 is fixed to a frame and the roller 3 runs on the curve 4. If the roller 3 reaches the lowest curve point, the curve rocker 2, here as a roller lever, is pivoted with the gripper shaft (possibly suction shaft) corresponding to the rotary joint 1, so that the grippers are opened. Reached the roller 3 the highest curve point, the gripper shaft (possibly suction shaft) is actuated by means of pivoting movement of the cam follower 2, so that the gripper are closed again.

In the second embodiment of the turning drum 23, the curve 4 is in turn fixed to the frame and the roller 3 rotates on the curve 4. Reached the role of the 3 deepest curve point, the rocker arm 2, here roller lever and control cam for vibration systems, pivoted about the pivot 1 swinging, so that over the Kurvenast 14 a Widerdruckgreifersystem is engageable. Reached the role of the highest curve point 3, the rocker arm 2 is pivoted about the pivot 1 oscillating, such that on the Kurvenast 15 a Perfecting gripper system is engageable.

REFERENCE NUMBERS

1

swivel

2

curve rocker

3

role

4

Curve

5

Focus

6

swivel

7

paddock

8th

swivel

9

swivel

10

swivel

11

swivel

12

energy storage

13

wing

14

curve branch

15

curve branch

16

printing unit

17

Bogenieiteinrichtung

18

conveying direction

19

chain system

20

boom

21

plate cylinder

22

Blanket cylinder

23

beater

24

transfer drum

25

pressure cylinder

F ₁

force

F ₁ '

force

F ₂

force

F ₂ '

force

I ₁

lever arm

I ₁ '

lever arm

I ₂

lever arm

I ₂ '

lever arm

M ₁

moment

M ₁ '

moment

M ₂

moment

M ₂ '

moment

Claims (8)

1. Control device for a sheet transport sheet system in a rotary sheet printing press with a swivel cam with a roller which is paired in force positive fashion with a cam in a cam linkage, characterised in that the swivel cam (2) with roller (3) mounted in a first rotary pivot (1), which is a gripper shaft or a suction shaft of a sheet guidance cylinder or is a pre-gripper, has a second rotary pivot (6) on which a link (7) is arranged, a swivel (13) is mounted in a fixed third rotary pivot (10) and has on its end a fourth rotary pivot (8) to which is fitted the link (7) connecting both swivels (2, 13), the swivel (13) with the fourth and third rotary pivots (8, 10), has a further fifth rotary pivot (9) which is connected with an energy store (12), and the energy store (12) is taken up in a sixth rotary pivot (11) arranged fixed.
2. Control device according to Claim 1, characterised in that the swivel (13) mounted swivellably in the third rotary pivot (10) has an arrangement of the fourth and fifth rotary pivots (8, 9) in such a fashion that:

   substantially at the deepest point of the cam (4), a lever arm (I₁) of a force (F₁) of the energy store (12) is greater than a lever arm (I₂) of a force (F₂) of the link (7) and

   approximateiy at the highest point of the cam (4), a lever arm (I₁') of a force (F₁') of the energy store (12) is smaller than a lever arm (I₂') or force (F₂') of the link (7).
3. Control device according to Claim 1, characterised in that the energy store (12) is a spring system.
4. Control device according to Claim 1, characterised in that the second rotary pivot (6) is arranged in the rotational axis of the roller (3).
5. Control device according to Claim 1, characterised in that the fifth rotary pivot (9) is arranged in the rotational axis of the fourth rotary pivot (8) of the swivel (13).
6. Control device according to Claim 1, characterised in that the fifth rotary pivot (9) is arranged between the fourth and third rotary pivots (8, 10) of the swivel (13).
7. Control device accordi ng to Claim 1, characterised in that the swivel (13) is a ternary member having the fourth, fifth and third rotary pivots (8, 9, 10).
8. Control device according to Claim 1, characterised in that, in the case of a double size sheet guiding cylinder, the control device is arranged symmetrically offset through 180° and in mirror fashion relative to one another on the cylinder periphery.

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