JP2000085108A - Method for controlling transfer rate of medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively control transfer rate of a medium prepared by a medium supply system at little expenses by altering the transfer rate of the medium such as a lacquer, water or ink in a specific range of a percentage circumferential speed ratio of a meshed roller and a roller placed at the rear side of the meshed roller. SOLUTION: An impression cylinder 1 having a gripper mechanism 2, an offset cylinder and a plate cylinder 4 are disposed. In order to indirectly adhere ink to the cylinder 4 via an inking roller 7, a meshed roller 5 to be driven by a variable speed driver 8 of an inking roller is installed together with a storage bottom plate 6 of an ink fountain bottom plate. A range of a percentage circumferential speed ratio of the roller 5 to a roller placed at the rear side of the roller 5 is set to 0.970 to 1.015 by the variable speed driver 8. Thus, an amount of the medium to be transferred can be easily set by altering the speed ratio of the roller 5 or a transfer roller to rollers 7, 4 or the like placed at the rear side of the previous rollers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the transmission of a medium such as ink, water or lacquer used in a printing press.

[0002]

2. Description of the Related Art In order to transmit ink or lacquer,
2. Description of the Related Art A feeding device is known which includes a meshed roller cooperating with a reservoir bottom plate (a roller having fine concave meshes on its surface), and at least one transfer roller cooperating with the meshed roller and a plate cylinder. German Patent 4344084). The meshed roller is connected to the drive gear system of the printing press, and rotates at the same peripheral speed as the downstream roller.

In order to change the optical density on printing paper, the peripheral speed ratio between an anilox roller (a roller having fine pits on its surface) and a forming roller is reduced from 1: 1 to 3: 1 to 1: 3. , Preferably from 2: 1 to 1: 2 (US Pat. No. 4,444,543).
No. 3). However, this change is ineffective in practice because of an improperly selected peripheral speed ratio and requires a transmission with a wide adjustment range. As a result, the amount of media to be transferred can only be changed by replacing the meshed rollers, i.e. to replace the previously used meshed rollers with a larger or smaller pumping capacity (volume of microcavities). It can only be done by replacing it with a meshed roller. Furthermore, when the rotational speed of the machine is low, the transmission rate of the medium (ink, lacquer, etc.) is very large and excessively supplied, and therefore, when applying ink, the density value of the printed matter is adversely affected. Disadvantage.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for effectively controlling the transmission rate of a medium prepared by a medium supply system (meshed roller / reservoir bottom plate) at low cost. It is in.

[0005]

SUMMARY OF THE INVENTION In accordance with the invention, this object is achieved in a printing press with a sump bottom plate and a roller which is located downstream of the sump bottom plate and functions as a setting roller, a setting cylinder, a transfer roller or a plate cylinder. Lacquer provided by the working meshed roller, water, a method of controlling the transmission of a medium such as ink by changing the peripheral speed ratio of the meshed roller and the roller placed behind it, The change of the percentage peripheral speed ratio is solved by means of claim 1 characterized in the range of 0.970 to 1.015, advantageous embodiments of the invention being described in the dependent claims. ing.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The method according to the present invention will be described below in detail with reference to the embodiments shown in the drawings.

[0007] The amount of medium to be transmitted (transmittance v-0) is
It is determined by the peripheral speed difference v-diff between the meshed roller or the transfer roller and the roller placed behind it. FIG.
Shows the transfer characteristic curve of this medium. This diagram shows the relationship between the transmissibility v-0 and the percentage peripheral speed difference v-diff, and the percentage peripheral speed difference 1 indicates that the peripheral speed of the meshed roller is the same as the peripheral speed thereof. Means.

In accordance with the method according to the invention, the transmission v-0 between the meshed roller and the roller following it, the setting roller, plate cylinder or transfer roller, depends on the meshed roller or transfer roller. For the trailing roller, it is changed by only slightly changing the peripheral speed, and thus by forming a minimum peripheral speed difference v-diff. The range of the percentage peripheral speed difference between the meshed roller or the transfer roller and the roller placed after it is 0.970 to 0.970.
1.015 is enough. Only in this minimum range can the transmission rate be changed effectively, and thus, for example, when applying ink, the optical density in the printing paper can be changed effectively. The change in the peripheral speed is made in the positive or negative direction, that is, as a decrease in the peripheral speed or as an increase in the peripheral speed. Thereby, many driving modes are conceivable. In the first operation mode, the transmission rate v-0 is reduced by forming the peripheral speed difference from the first operating point B1 (the peripheral speed difference is 1, ie, constant speed operation).

This mode of operation is also involved in the control circuit. When the number of revolutions of the machine decreases or is low, the peripheral speed difference v-diff is increased, and the transmission rate v-0 is reduced in order to reduce the amount of ink transmitted.

In a second embodiment, the printing press is usually
It is operated at a second operating point B2 located on the up line or down line of the characteristic curve. When the peripheral speed difference v-diff decreases in the direction of the value 1, that is, at a constant speed, the transmission rate v-0 increases.

FIG. 1 schematically shows a roller structure of an instantaneous setting (anilox type) device of a sheet paper printing machine. The method according to the invention is used for this short-range wearing device. This roller arrangement structure has an impression cylinder 1 provided with a gripping mechanism 2, an offset cylinder 3, and a plate cylinder 4. To indirectly apply ink to the plate cylinder 4 via a setting roller 7, a meshed roller (ink discharge roller) 5 is attached together with a reservoir bottom plate (ink fountain bottom plate) 6. The meshed roller 5 is provided with a variable speed drive 8. A transfer roller can be arranged between the setting roller 7 and the meshed roller 5. In this case, either the meshed roller 5 or the transfer roller is provided with a variable speed drive 8.

The variable speed drive 8 is designed as a specific drive, for example as a motor. This drive is
It can also be achieved by incorporating the drive gear system of the meshed roller 5 or the transfer roller into the drive gear system of the printing press, and by interposing a variable speed conversion element between the drive gear and the meshed roller 5 or the transfer roller. . The conversion factors for the minimum peripheral speed to be realized are brakes,
A clutch or the like is used.

The mesh roller 5 rotates in the same direction (indicated by the rotating arrow in FIG. 1), ie the meshed roller and the roller following it have the same direction of rotation at their point of contact. .

In a different embodiment, the meshed roller 5 operates in a counter-rotating manner (indicated by a double arrow in FIG. 1), ie the meshed roller and the rollers following it are in contact with each other. The points have different directions of rotation.

[0015]

[Brief description of the drawings]

FIG. 1 is a schematic view of a roller arrangement structure of a printing press according to the present invention.

FIG. 2 is a characteristic curve diagram of a transmissivity of a medium.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Impression cylinder 2 Holding mechanism 3 Offset cylinder 4 Plate cylinder 5 Meshed roller (ink fountain roller) 6 Reservoir bottom plate (ink fountain bottom plate) 7 Wearing roller 8 Drive unit v-diff Circumferential speed difference v-0 Transmission rate B1 First Operating point B2 Second operating point

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Reinhard, Nerger Radebeul, Germany, August-Karden-Strasse, 9 (72) Inventor Bernd, Pazelt Hemnitz, Germany, Karl-Imerman-Strasse, 10 a

Claims (4)

[Claims] In a printing press, lacquer and water are provided by a sump bottom plate and a meshed roller which is provided behind the sump bottom plate and cooperates with a roller serving as a setting roller, a setting cylinder, a transfer roller or a plate cylinder. In a method of controlling the transmission rate of a medium such as ink by changing the peripheral speed ratio between a meshed roller and a roller placed behind the roller, the percentage peripheral speed ratio is changed from 0.970 to 0.970. 1.01
5. A method for controlling the transmission rate of a medium in a printing press, the method comprising: 2. The method according to claim 1, wherein the percentage peripheral speed ratio is changed from a value of 1 in a positive or negative direction. 3. The method according to claim 1, wherein the percentage peripheral speed ratio is changed in a direction of a value of one. 4. The medium transmission rate control according to claim 1, wherein when the speed of the printing press is low, the peripheral speed of the meshed roller or the transfer roller is changed in a direction of a large peripheral speed difference. Method.