JPH06198855A - Device and method to attenuate mechanical vibration of press - Google Patents

Abstract

PURPOSE: To damp mechanical vibrations of a printing machine, and improve the printing quality. CONSTITUTION: At least one operation members B1 , B3 , B5 , B5 ', Bn , Bn+2 , Bn+4 being arranged at the rotating section of a printing machine 1 are provided, and the operation members are controlled by vibration receivers S2 , S3 , S4 , S5 , Sn , Sn+2 , Sn+4 which are arranged on the printing machine 1, and the regulating forces of the operation members B1 , B3 , B5 , B5 ', Bn , Bn+2 , Bn+4 damp the vibrations.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an apparatus and method for damping mechanical vibrations in a printing press.

[0002]

2. Description of the Related Art Parts of a printing press (eg cylinder and rollers)
The kinetic force of the drive system connected to is defined by the spring constant, inertial force, and the like. The rotating part of the drive system causes vibration due to the following effects. In this case, a distinction is made between angle-related effects that repeat with each rotation and effects that do not repeat aperiodically. Angle-related or synchronous vibrations include load moment vibrations, which can be caused, for example, by cam transmissions or by gear defects. Vibrations that repeat aperiodically with rotation, that is, non-synchronous vibrations, are generated by, for example, periodic excitation different from the rotation speed. Such excitation is caused, for example, by a transmission belt, by a lever stop or by a gear error. The effects of ink splitting or sheet transfer also cause asynchronous vibrations. Furthermore, aperiodic vibrations in the system are caused by parameter changes, for example oil temperature changes that affect friction.

Synchronous disturbances have high excitation energies, and the periodic vibrations caused by such excitation energies do not significantly affect the print quality associated with blurring. This is because the rotating parts of the printing press always occupy the same angular position at the time of sheet delivery. However, asynchronous disturbances appear in the print quality and cause blurring. This is because the angular position of the rotating part of the printing press is displaced by asynchronous vibrations during the sheet transfer. The effects of such disturbances are often based on small excitation energies and often manifest themselves when low damping natural frequencies of the printing press occur.

It is known to use sidewall reinforced or reinforced gears as well as reinforced components to reduce mechanical vibrations of the printing press. Such a procedure is expensive and adds significantly to the weight of the press and does not produce the desired result.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus and method for damping mechanical vibrations of a printing press to improve print quality.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, in the structure of the present invention, at least one operating member assigned to a rotating part of the printing machine is provided, and the operating member is provided by a vibration receiver arranged in the printing machine. It is controlled so that the adjusting force of the operating member damps the vibration. Furthermore, the method according to the invention is adapted to detect vibration as a measured value and thereby form an adjusting force, which causes a damping effect on the printing material guiding mechanism.

[0007]

With the arrangement according to the invention, asynchronous disturbances are advantageously eliminated. This is because such disturbances have significantly less excitation energy and are damped by a relatively small adjustment force (compared to the overall drive power). Vibrations are detected by at least one vibration receiver. The data detected by the vibration receiver are evaluated and provided for the control of the actuating element, the actuating element being embodied as an active adjusting element. The adjusting force produced by the actuating member acts against the vibration-exciting force, resulting in a damping action. Asynchronous interference damping prevents blurring and consequently improves print quality.

According to another aspect of the invention, the operating member is configured as a controllable eddy current brake. The eddy current brake is controlled-corresponding to the excitation frequency-and acts actively on the entire drive system, so that asynchronous vibrations are eliminated.

Additionally or alternatively, one operating member is provided.
It is also possible to configure with one drive motor or with an additional motor of the printing press. The moment due to the drive motor is controlled in relation to the data detected by the vibration receiver, for example by means of suitable components of the output electronics, so that the drive motor itself forms the operating member and participates in the vibration damping. To do. To this end, the drive motor has a dual function, producing drive output on the one hand and vibration damping action on the other hand. Similarly, an additional motor can be installed in the drive system of the printing press,
The motor is correspondingly controlled for vibration damping.

Further advantageously, the vibration receiver and the actuating member are arranged in the adjusting circuit of the damping and adjusting device. With such a configuration as the adjusting circuit, the generated asynchronous vibration is always adjusted to zero, and as a result, the optimum damping action is obtained.

A plurality of vibration receivers and / or operating elements are preferably arranged distributed over the drive system of the printing press, in particular over the gear system. With the aid of several vibration receivers, the vibration form required for damping can be derived with great precision, and the vibration form--in some cases in processed form--is fed to several active actuating elements of the drive train. It

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A printing machine 1 shown in FIG. 1 has a plurality of printing devices 2. Each printing device 2 comprises a plurality of printing cylinders and rollers, the printing cylinders and rollers being shown only partly for the sake of clarity. Each printing device 2 has a drive motor (electric motor) M ₁ . M ₃ , M ₅ , M _n ,
It is driven by M _{n + 2} and M _{n + 4} . A vibration receiver (Schwingungsaufnehme
r) S ₂ , S ₃ , S ₄ , S ₅ , S _n ′, S _{n + 2} , S _{n + 4} are assigned and the vibration receiver is connected to the adjusting device 3.

Although the drawings illustrate embodiments of the present invention, the invention is not limited to the illustrated embodiments. The printing device 2 located on the leftmost side in the drawing has a drive motor M ₁ which acts on the drive train of the printing press 1.
A vibration receiver S ₂ is assigned to one of the printing cylinders / rollers of the printing device 2, which vibration receiver is connected to the adjusting device 3. A line of action leads from the adjusting device 3 to the drive motor M ₁ .

The vibration receiver S ₂ detects the vibration generated by the printing device _{2 to} which it belongs and transmits the corresponding data to the adjusting device 3. The coordinator makes the evaluation. In particular, non-periodic vibrations are detected, control values are formed and act on the drive motor M ₁ . Therefore, the drive motor M ₁ forms the operating member B ₁ . The control of the drive motor M ₁ does not give rise to a constant drive moment, but is based on a special control, the adjusting device 3
By means of an additional adjustment force, which acts against asynchronous vibrations, and as a result
Vibration damping is performed overall.

The second printing device 2 from the left shows the same suitable arrangement as the printing device 2 located on the leftmost side in the drawing, but in this case there is a difference, however, that a plurality of vibration receivers, S ₃ and It is provided with a S _4, these vibrations receiver detects the vibration at different positions of the drive system, which supplies the corresponding data to the adjustment unit 3. A drive motor is also conceivable as the operating member. This is the motor M ₃ .

The third printing device 2 from the left in the drawing shows another embodiment. Only one vibration receiver S ₅ is provided, which is connected to the adjusting device 3. However, two components are used as actuating members for producing the adjusting force. This is a drive motor M ₅ , which acts as an actuating member B ₅ and is an additional motor M ₅ ′, which is arranged elsewhere in the drive system, which motor B ₅ ′. Acts as. Both motors are adapted to be controlled by the adjusting device 3 so that the moments produced are adjusted corresponding to the required drive power and in connection with the asynchronous damping of the vibration.

In the fourth printing press from the left, the arrangement is based on the printing device 2 on the left-most side, but in this case there is a difference, and the adjusting device 3 additionally controls the eddy current brake W. Then, the eddy current brake actively acts on the drive system to which the printing device 2 belongs, and the generated vibration is damped.

Obviously, the embodiments described are only examples and can be used in any combination with a plurality of vibration receivers or actuating members in the enlarged range.

[Brief description of drawings]

FIG. 1 is a schematic view of a printing machine provided with a vibration damping device.

[Explanation of symbols]

1 printing machine, 2 printing device, 3 adjusting device,
_{B 1, B 3, B 5} , B 5 ', B n, B n + 2, B n + 4 operating _{member, M 1, M 3, M} 5, M n, M n + 2, M n + 4 drive Motor, S ₂ , S ₃ , S ₄ , S ₅ , S _n ′, S _{n + 2} , S _{n + 4}
Vibration receiver, W Eddy current brake

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Bernhard Wagen Sommer Federal Republic of Germany Wiesloch Pestarozzi Strasse 18

Claims (7)

[Claims] 1. A device for damping mechanical vibrations of a printing press, wherein at least one operating member (B ₁ , B ₃ , B ₅ , B ₅ ′) assigned to a rotating part of the printing press (1). ，
B _n , B _{n + 2} , B _{n + 4} ) are provided, and the operation members are arranged on the printing machine (1) by vibration receivers (S ₂ , S ₃ , S ₄ ,
S ₅ , S _n ′, S _{n + 2} , S _{n + 4} ) are controlled by the operating members (B ₁ , B ₃ , B ₅ , B ₅ ′, B _n , B _{n + 2} , B _{n + 4).} Device for damping mechanical vibrations of a printing press, characterized in that the adjusting force of (a) is adapted to damp vibrations. 2. An operating member (B ₁ , B ₃ , B ₅ , B ₅ ′, B _n ,
_2. The device according to claim 1, wherein _{Bn + 2} , _{Bn + 4} ) are designed as controllable eddy current brakes (W). 3. An operating member (B ₁ , B ₃ , B ₅ , B ₅ ′,
B _n , B _{n + 2} , and B _{n + 4} are additional motors (M ₅ ′) or drive motors (M ₁ .M ₃ , M ₅ , M _n ,) of the printing machine (1).
_{Mn + 2} , _{Mn + 4} ).
The described device. 4. A vibration receiver (S ₂ , S ₃ , S ₄ , S ₅ , S
_n ′, S _{n + 2} , S _{n + 4} ) and operating members (B ₁ , B ₃ , B ₅ ,
_4. Device according to claim 1, wherein B ₅ ′, B _n , B _{n + 2} , B _{n + 4} ) are arranged in the adjusting circuit of the vibration damping and adjusting device (3). 5. The adjusting device (3) comprises operating members (B ₁ , B ₃ ,
B ₅ , B ₅ ′, B _n , B _{n + 2} , B _{n + 4} ) are controlled so that the rotation of the rotating portion and the non-periodic vibrations, that is, the asynchronous vibrations are damped. Claims 1 to 4
The apparatus according to claim 1. 6. A plurality of vibration receivers (S ₂ , S ₃ , S ₄ ,
S ₅ , S _n ′, S _{n + 2} , S _{n + 4} ) and operating members (B ₁ , B ₃ ,
B ₅ , B ₅ ′, B _n , B _{n + 2} , B _{n + 4} ) are arranged distributed over the drive system, in particular over the gear system of the printing press (1). The apparatus according to item 1. 7. A method for attenuating mechanical vibrations in a printing material guiding mechanism of a printing press, which reduces the print quality, wherein the vibrations are detected as measured values, whereby an adjusting force is formed, which adjustments are made. A method for dampening mechanical vibrations of a printing press, characterized in that the force exerts a vibration damping effect on the printing material guiding mechanism.