JPH11188840A - Control device for sheet paper conveying apparatus in sheet paper rotary printing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct positive forcible movement in a cam link in particular by connecting a rotation coupling with an energy accumulation means, and holding the energy accumulation means on the rotation coupling arranged on a frame fixation. SOLUTION: The rotation coupling 1 is disposed on a frame fixation in a sheet paper guiding cylinder in a transmission technical manner. The rotation coupling 1 has a cam rocker arm 2 at its end part side. The cam rocker arm 2 supports a roller 3 being in functional connection with a cam 4 secured at its nonrestraint end part. The cam rocker arm 2 is provided with a rotation coupling 6 disposed to be joined with a connection tool 7. Furthermore, the connection tool 7 is connected to a rotation coupling 8 set on another rocker arm 13. Accordingly, the connection tool 7 is a two-section link including rotation couplings 6, 8 in electrical relation. The rocker arm 13 is disposed on a sheet paper guiding cylinder at the rotational coupling 10 of the frame fixture, and includes another rotation coupling 9 between the rotation couplings 8, 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a sheet transporting device in a sheet-fed rotary printing press, which has a cam rocker arm having rollers. The present invention relates to a type in which cam links are paired by frictional engagement.

[0002]

2. Description of the Related Art Such a control device is known, for example, from DE-A-934 770. Here, the sheet transport device is formed as a gripper device for the impression cylinder, and controls the gripper pressure applied to the leading edge of the sheet in consideration of the tensile load. The jaw arrangement consists essentially of a jaw shaft having a roller lever that rotates on the control cam. The gripper shaft is additionally frictionally loaded in the gripper closing direction by a compression spring arranged on the bar. The gripper shaft is opened against the spring force by the cam control device. In another configuration, the spring force is increased by virtue of the fact that the rod supporting the compression spring is lengthened and the levers and rollers pivotally connected to the barrel are geared against the additional cam control device. It can remain unchanged or be reduced.

A disadvantage in this case is that the forces acting on the cam transmission of the first configuration promote wear and, in the worst case, the roller levers lift off the control cam. The second configuration is costly because it requires an additional control cam having levers and rollers. In addition, a lot of construction space is required because the rod passes through the barrel axis, which makes this solution applicable to impression cylinders several times larger (based on the same plate cylinder). Is making it difficult.

Another control device is the European Patent Office Patent No. 0
It is known from US Pat. No. 4,527,721. Here, the sheet transport device is formed as a mouthpiece device for turning a sheet with a paper transfer cylinder. The mouthpiece is operatively connected to two back-to-back swinging jaw devices arranged behind it for turning the sheet on the principle of trailing edge turning. DE-A-43 39 388 discloses a control device for a gripper provided on a turning cylinder. A gripper shaft lever that supports a cam roller at an end is disposed on the gripper shaft. The cam roller, which is loaded by frictional engagement by the tension spring, is paired with the cam track. In this case, the cam track is integrated on the end side inside the roller lever, and the cam roller projects into the roller lever to form a cam link with the cam track. The roller lever has a center of rotation and further supports the roller at the end opposite the cam track. This roller is paired with the control cam to form another cam link. The roller lever is additionally operatively connected to a compression spring that guides the roller on the control cam by frictional engagement.

During the course of the movement of such a device, it is necessary to ensure a forced movement at the cam link, preferably by frictional engagement, so that the force couple between the control cam (drive) and the roller lever (follower) is reduced. The fact that it is exposed to a constantly changing load is a disadvantage. In sheet transport devices, such as rotating sheet guide cylinders and oscillating swing grippers, especially at relatively high machine speeds (greater than about 1000 sheets / hour), additional inertial forces, such as centrifugal forces, cause the cam link to be disengaged at the cam links. It is known that the force couple is partially lost. On the other hand, the constantly occurring rapid load change reaction promotes the wear of the control device formed as a cam transmission.
This has an adverse effect on print quality.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to avoid the disadvantages mentioned above, and in particular to provide a reliable forced movement of the cam link and to significantly reduce the load change response inside the device. Is to provide a control device.

[0007]

According to the present invention, a cam rocker arm having a roller supported by a rotary joint has a rotary joint, and a connecting member is connected to the rotary joint. Is arranged, the rocker arm is supported by a rotating joint fixed to the machine frame and has a rotating joint on the end side, and a connecting tool connecting both rocker arms to the rotating joint is arranged, The rocker arm with the rotary joint has another rotary joint, which is connected to the energy storage means, the energy storage means being held by a rotary joint arranged fixed to the machine frame. . Advantageous configurations of the invention are set out in the dependent claims.

The control device according to the invention relates to a sheet transport device which can be used for rotating sheet guide cylinders, such as impression cylinders, transport cylinders and turning devices, feed cylinders and swinging swing grippers. In this case, the sheet transport device is formed by a number of grippers arranged on the gripper shaft or a pneumatically loadable sheet holding device, for example, a mouthpiece shaft with a corresponding mouthpiece device. . In another configuration, the sheet transport device can be used as a swinging device for a front gripper and / or a backprint gripper and / or a mouthpiece.

The control device for the sheet transport device is suitable both for sheet-fed rotary printing presses dedicated to the printing operation and for sheet-fed rotary printing machines capable of switching between front and double-sided printing. .

[0010] The control shaft (holding pawl shaft or mouthpiece shaft) of the sheet transport device is connected in a known manner to a roller lever with a roller paired with a cam. The control shaft is, in the transmission technology, a rotary joint having a center of rotation. In this case, the rotation center point is not limited to the control axis as described above. Instead of the control shaft, it is possible to provide another plate, which oscillates about the center of rotation of the rotary joint, as a control cam, preferably as a control cam for the sheet guide cylinder, which at the same time takes on the function of a roller lever. .

The roller lever corresponds to the cam rocker arm in terms of transmission technology, and the energy is transmitted through the rocker arm fixed to the machine frame and the connecting member so that the forced movement of the cam link formed by the roller and the cam is ensured. It is connected to the storage means by transmission technology. In this case, ensuring the forced movement should be understood as a constant contact between the roller (follower) and the cam (drive). This is because the motor and follower must be in constant contact during the course of exercise. Ensuring the forced movement can be achieved by means of energy storage, which is preferably formed as a spring device, or alternatively by a force pair formed by hydraulic or pneumatic members.

In addition, since the cam rocker arm of the control device is connected to another means, the force couple at the cam link to achieve a more uniform forced movement of the driving and follower joints will result in a sudden load change. Not exposed to reaction. The force field in the control device is improved such that the forces acting on the transmission members according to the law of cam outside the rotary joint are at a defined level.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings.

As shown in FIG. 3, the multicolor offset sheet-fed printing press has a plurality of printing units 16 arranged in a serial manner. Each printing unit 16 is a plate cylinder 2
1, a blanket cylinder 22 and an impression cylinder 25 are provided. The inking unit and, in some cases, the dampening unit are not described in detail here. Arranged between the printing units 16 is at least one turning cylinder 23 for transporting sheets and a transport cylinder 24 for the sheets to be processed in the transport direction 18.
Behind the last printing unit 16 is arranged in a manner known per se a feeder 20 having an annular chain device 19 supporting a plurality of gripper devices. A sheet guiding device 17 is attached to the transport cylinder 24, the turning cylinder 23, and the sheet feeding device 20 in a modular manner having a guiding surface that is as uniform as possible.

FIG. 1 shows a control device according to the invention, generally for a sheet guide cylinder. The kinematic diagram shows the rotary joint 1 which is arranged on a sheet-fed guide cylinder in a machine-fixed manner in the transmission technology. Here, for example, the impression cylinder 25, the turning cylinder 23, the transport cylinder 24, a rotating sheet guiding cylinder formed as a paper feeding cylinder (not shown), or a swinging swing gripper (not shown) is fixed to the machine frame. Is interpreted as

A cam rocker arm 2 is pivotally attached to the end of the rotary joint 1. The cam rocker arm 2 supports, at its unconstrained end, a roller 3 operatively connected to a fixed cam 4. On the cam rocker arm 2, a rotary joint 6 connected to a connecting member 7 is arranged.

Alternatively, it is also possible to arrange the rotary joint 6 (to which the coupling 7 is pivotally mounted) on the axis of rotation of the roller 3.

Further, the connecting member 7 is a separate rocker arm 1.
3 is connected to the rotary joint 8.

The coupling 7 is thus a two-joint link with two rotary joints 6, 8 in transmission technology. The rocker arm 13 is arranged on the sheet guide cylinder with a rotary joint 10 fixed to the machine frame, and has another rotary joint 9 between the rotary joints 8 and 10.

Alternatively, it is possible to arrange the rotary joint 9 at the rotation axis of the rotary joint 8.

The rotary joint 9 is connected to the energy storage means 12, and the energy storage means 12 is disposed on the sheet guide cylinder by a rotary joint 11 fixed to the machine frame. All rotary joints 1, 6, 8, 9, 10, 11 each have a link degree of freedom f = 1.

The rocker arm 13 can alternatively be formed as an angle lever, in which case it is a three-bar link with rotary joints 8, 9, 10.

In a first configuration, the control device shown in FIG. 1 is arranged on an impression cylinder 25 having a center 5. The kinematic diagram corresponds to a transmission member configured as follows.

The rotary joint 1 is a gripper shaft having a plurality of grippers supported on the impression cylinder.

Cam rocker arm 2 (and roller 3)
Is disposed as a roller lever on the side of the gripper shaft.

The cam 4 is a control cam for controlling the opening and closing movement of the gripper on the gripper shaft (rotary joint 1) via the roller 3 and the roller lever (cam rocker arm 2).

The coupling 7 is a rod or equivalent pulling means which is pivotally connected at its end to the rotary joint 6 of the roller lever (cam rocker arm 2) and to the rotary joint 8 of the rocker arm 13.

The rocker arm 13 is a lever which is arranged on a rotary joint fixed to the machine frame by the impression cylinder 25 and has another rotary joint 9 in the section between the rotary joints 8 and 10 ( 1 and 2) three rotary joints 8, 9, 10
An angle lever (not shown) as a three-bar link having the following.

The rotary joint 9 is the first point of action of the energy storage means 12.

The energy storage means 12 is preferably a spring device with another force application point at the rotary joint 11. In this case, the rotary joint 11 is arranged on the impression cylinder 25 in a machine frame fixed manner. The gripper shaft with roller lever described for the rotary joint 1 can alternatively be replaced by a mouthpiece shaft with roller lever.

In a second configuration, a control device according to FIG. 2 is arranged on a turning cylinder 23 having a center point 5, which can be used both for sheet-fed printing presses and for sheet-fed printing operation. It also relates to paper printing machines. At this time, the correspondence is as follows.

The rotary joint 1 corresponds to the fixed rotation axis of the turning cylinder 23.

Cam rocker arm 2 (and roller 3)
Corresponds to a plate that is pivotally supported on the rotation axis of the rotary joint 1. This plate is the first
A roller lever and, secondly, a dual function as a control cam for a rocking device for the gripping pawls, especially for front printing and duplex printing. In this case, the control cam is formed by two cam backs 14, 15,
The roller 3 is again paired with the cam 4. The cam 4 controls the pivoting movement of the plate about the axis of rotation (rotary joint 1), and the cam backs 14 and 15 have separate roller levers (and rolls) and a gripper for front printing or a gripper for double-sided printing. To form a cam link.

The rotary joints 6, 8 are the pivot points of the coupling 7 formed as a rod.

The rocker arm 13 is a lever which is arranged on the rotary joint 10 of the turning cylinder 23 and which is fixed to the machine frame, and which can turn around the axis of the rotary joint 10.

The rotary joint 9 is the pivot point of the energy storage means 12, here formed as a spring device.

The rotary joint 11 fixed to the machine frame by the turning cylinder 23 is
The axis of rotation and the point of application of force for the energy storage means 12 or the spring device.

As is well known, the law of motion of the cam 4 provides the highest point and the lowest point of the cam link so as to realize a desired periodic movement that progresses over time. In terms of transmission technology, the roller 3 and the cam 4 form a cam link at their point of evenness. In this case, the forced movement of the roller 3 is ensured by frictional engagement by means of an energy storage means 12, for example a spring device having a compression spring or a tension spring.

The prescribed force for ensuring the forced movement of the roller 3 and the cam 4 at the cam link is maintained by the control device of the invention over almost the entire law of motion. This is realized by the rocker arm 13 supported on the rotary joint 10 fixed to the machine frame by the turning cylinder 23 and having two rotary joints 8 and 9. The rocker arm 13 is driven by the rocker arm 13 pivoting about the rotary joint 10 such that this ratio and force relationship, and thus the moment, changes, resulting from the law of motion of the cam 4 and causing a normal load change response. To compensate.

According to FIG. 4, the rocker arm 13 is turned around the rotation axis of the rotary joint 10 and the cam link (roller 3, cam 4) is represented by a position where the cam 4 has almost the lowest point on the cam body. ing. This corresponds to the position shown by the solid line in FIG. The force F1 acts in the direction of the force of the energy storage means 12, and a moment M1 is generated by the arm L1 (a perpendicular line from the rotation center point of the rotary joint 10 toward the direction F1 of the force). Further, a force F2 is applied by the connecting tool 7, and a moment M2 is generated by the lever L2 (a perpendicular line from the rotation center point of the rotary joint 10 toward the force direction F2). The rocker arm 13 having the rotary joints 8 and 9 is formed by the lever arms L1 and L2 such that the ratio L1> L2 at the lowest point of the cam body (cam 4).

According to FIG. 5, the rocker arm 13 pivots around the rotation axis of the rotary joint 10 and is represented by the position where the cam link (roller 3, cam 4) has almost the highest point on the cam body (cam 4). Have been. This corresponds to the position indicated by the broken line in FIG. A force F1 'acts in the direction of the force of the energy storage means 12, and a moment M1' is generated by the arm L1 '. A force F2 'acts on the connecting member 7, and a moment M2' is generated by the lever L2 '. At the highest point of the cam body (cam 4), this ratio becomes L1 '<L2'.

The rocker arm 13 has a rotation axis (rotary joint 1).
0), so that the forces F1, F2,
F1 ', F2' and lever arms L1, L2, L1 ', L
By the change of 2 ', the moments M1, M2, M1', M2 'are compensated for one another so that a constant force is always produced at the cam link of the roller 3 and the cam 4. In this case, the pivoting movement of the rocker arm 13 and thus the change of the leverage takes place in connection with the cam law of the cam 4. According to the formation of the lever arm in the rocker arm 13, the contact force of the roller 3 at the highest point and the lowest point of the cam body in the cam link is substantially equal, and preferably, the contact force of the roller 3 at the lowest point of the cam is the highest point of the cam. Greater than the contact force at In this case, in the rocker arm 13, this ratio is L1> L2 at the lowest cam point, and L1 at the highest cam point.
1 ′ <L2 ′.

The control device is not limited to a unit-size sheet guiding cylinder on the basis of a unit-size plate cylinder. This device is also suitable for sheet guide cylinders that are several times larger. For example, in a sheet-guiding cylinder which is twice as large, the control devices are arranged in a mirror image relative to each other, offset by 180 ° symmetrically around the cylinder circumference.

The mode of operation is as follows. In a first configuration of the sheet-guiding cylinder, in particular of the impression cylinder 25, the cam 4 is fixed to the machine frame and the rollers 3 rotate on the cam 4. When the roller 3 reaches the lowest point of the cam, the cam rocker arm 2, here the roller lever, pivots on the gripper shaft (or the suction shaft in some cases) corresponding to the rotary joint 1, and the gripper is opened. When the roller 3 reaches the highest point of the cam, the swiveling motion of the cam rocker arm 2 operates the gripping pawl axis (or, in some cases, the mouthpiece axis), and the gripping pawl closes again. In the second configuration of the turning cylinder 23, the cam 4 is also fixed to the machine frame, and the roller 3 rotates on the cam 4. When the roller 3 reaches the lowest point of the cam, the cam rocker arm 2, here the roller lever and the control cam for the swinging device, are connected to the rotary joint so that the back-printing gripper device can oscillate via the cam back 14. It turns around 1 around like a pendulum. When the roller 3 reaches the highest point of the cam, the cam rocker arm 2 is moved so that the holding pawl device for front printing can respond via the cam back portion 15.
Swings around the rotary joint 1 like a pendulum

[Brief description of the drawings]

FIG. 1 is a motion diagram of a control device according to the present invention.

FIG. 2 shows a control device for a sheet guiding cylinder.

FIG. 3 is a partial sectional view of a sheet-fed rotary printing press.

FIG. 4 shows the control device according to FIG. 2 at the lowest point of the cam.

FIG. 5 shows the control device according to FIG. 2 at the highest point of the cam.

[Explanation of symbols]

1 rotary joint, 2 cam rocker arm, 3 roller, 4 cam, 5 center point, 6 rotary joint, 7
Connecting device, 8 rotating joint, 9 rotating joint, 10 rotating joint, 11 rotating joint, 12 energy storage means, 13 rocker arm, 14 cam back, 15
Back of cam, 16 printing unit, 17 sheet guiding device, 18 transport device, 19 chain device, 2
0 paper feeder, 21 plate cylinder, 22 blanket cylinder, 23
Turning cylinder, 24 transfer cylinder, 25 impression cylinder, F1 force,
F1 'force, F2 force, F2' force, L1 lever arm, L1 'lever arm, L2 lever arm, L
2 'lever arm, M1 moment, M1' moment, M2 moment, M2 'moment

Claims (12)

[Claims] 1. A control device for a sheet transport device in a sheet-fed rotary printing press, comprising a cam rocker arm having rollers, the rollers of the cam rocker arm being in contact with a cam by frictional engagement. A cam linker arm (2) supported by a rotary joint (1) comprising a roller (3) having a rotary joint (6), comprising a roller (3). A coupling (7) is arranged on the rotary joint (6), and the rocker arm (1) is mounted on the rotary joint (10) fixed to the machine frame.
3) are supported, this rocker arm (13) has a rotary joint (8) on the end side and a connection connecting both rocker arms (2, 13) to this rotary joint (8). Tool (7) is disposed, and the rotary joint (8, 1
Rocker arm (13) having a rotary joint (9), which is connected to the energy storage means (12), and the energy storage means (12) A control device for a sheet transport device in a sheet-fed rotary printing press, characterized in that it is held with a rotating joint (11) that is fixedly arranged. 2. The control device according to claim 1, wherein the rotary joint is a gripper shaft of a sheet guide cylinder or a swing gripper. 3. The control device according to claim 1, wherein the rotary joint is a sheet guiding cylinder or a suction shaft of a swing gripper. 4. The control device according to claim 1, wherein the rotary joint is a rotary shaft of a control cam of a sheet guiding cylinder. 5. The control cam comprises two cam backs (14,
The control device according to claim 1, wherein the control device has 15). 6. A rocker arm (13) pivotally supported by a rotary joint (10) having the device of a rotary joint (8, 9), and at approximately the lowest point of the cam (4) an energy storage means (6). 12)
The lever (L1) of the lever (L1) of the force (F1) is larger than the lever (L2) of the lever (F2) of the connecting member (7), and the energy storage means (12) at the highest point of the cam (4).
2. The control device according to claim 1, wherein the lever arm (L1 ') of the force (F1') is smaller than the lever arm (L2 ') of the coupling device (7). 7. The control device according to claim 1, wherein the energy storage means is a spring device. 8. The control device according to claim 1, wherein the rotary joint (6) is arranged in the rotation axis of a roller (3). 9. The rocker arm (1), wherein the rotary joint (9) is
2. The control device according to claim 1, wherein the control device is arranged in a rotation shaft of the rotation joint (3). 10. The control device according to claim 1, wherein the rotary joint (9) is arranged between the rotary joints (8, 10) of the rocker arm (13). 11. The rocker arm (13) is a three-bar link having a rotary joint (8, 9, 10).
The control device as described. 12. The control device according to claim 1, wherein the sheet guiding cylinder is a double-size cylinder, and the control devices are arranged 180 degrees symmetrically around the outer circumference of the cylinder and are arranged in a mirror image with each other.