JPS62165135A - Printing pressure measuring instrument for printing machine - Google Patents

Abstract

PURPOSE:To improve the efficiency of printing pressure adjustment by providing a layer of a piezoelectric film nearby the surface of a blanket drum and mounting an electrode couple on its inside and outside surfaces to measure printing pressure during the operation of a printer. CONSTITUTION:The blanket drum 2, a blanket 5, the piezoelectric film 7, the electrode couple 8, a signal input part 14, etc., are provided. Then, when compressive force is applied to the film 7, a piezoelectric voltage is developed in proportion to the force and sent to the input part 14 through the electrode couple 8. The input part 14 samples the generated voltage from an electrode couple group 8 which is equal in length and width when the lowermost part of the blanket 5 reaches a specific position, and then sends it to a receiving and analyzing part 20 outside the printer. When the lowermost depression part further moves to a next specific position, the generated voltage is sampled again from an electrode couple group 8 which is equal in width and specific length shorter and sent to the analyzing part 20. The analyzing part 20 extract the generated voltage of a position corresponding to the difference in electrode length by the electrode couple group 8, etc. Thus, the profile of a printing pressure distribution is obtained.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is applicable to printing machines, paper processing machines, paper making machines, etc., where quantitative excess or deficiency of roll pressure, non-uniformity in the axial direction and circumferential direction, etc. Applicable to equipment that affects performance or product quality.

[Conventional technology]

FIG. 6 is a roll arrangement diagram near the blanket cylinder of the printing press, where l is the plate cylinder, 2 is the blanket cylinder, 3 is the impression cylinder,
4 is the printing paper.

The blanket cylinder 2 has a structure as shown in Fig. 9.
, the blanket 5 covering the outer periphery of the blanket cylinder 2 is fixed by a fastening fitting (not shown) in the gap 6.

Conventionally, a printing press has a blanket cylinder 2 and an impression cylinder 3 or a plate cylinder 1.
To adjust the printing pressure, insert a thin plate of stainless steel or other material into the paper to be printed, and intuitively judge the unevenness of the pressure by the resistance when pulling it out by hand. Detect the average printing pressure distribution by installing a load cell that converts force for bending or compression into electricity, or use pressure-sensitive color-changing paper to convert the pressure distribution into the degree of color change and perceive the degree of pressure. The shaft position was adjusted by means such as

Furthermore, recently, a sheet of piezoelectric organic polymer material (hereinafter referred to as piezo film) has been sandwiched between sheets of printing paper 40 in FIG. 6, and the pressure distribution has been measured by pressure→electricity conversion. For example, JP 60-15533.60-1553
4.60-15535 etc. have been released.

[Problem that the invention seeks to solve]

The conventional technology described above can only measure static printing pressure.1)
However, there are problems such as that it is not suitable for applications such as axis adjustment by timely measurement of printing pressure during test runs or operation.

[Means for solving problems]

As shown in FIG. 1, a film-like plastic (piezo film) 7 having a piezo effect is embedded within or on the surface of the blanket cylinder 2 and blanket 5, or a similar film is sandwiched between the cylinder and the blanket. Two electrode pair groups 8, 8' divided in the axial direction and the circumferential direction as shown in FIG. 2 are attached to both sides of the film. When another roll (impression cylinder or plate cylinder) compresses the blanket 5, the voltage value generated at the two electrode pair groups 8 and 8' divided in the axial direction and the circumferential direction is collected by the voltmeter 9. , the signal is transmitted to the outside via wired or wireless method, and the signal is received and analyzed outside the aircraft.

[For production]

A voltage is generated in the piezo film in response to the pressure that the blanket cylinder presses against the printing paper, and this generated voltage is detected by a voltmeter via a group of electrodes attached to the piezo film.

In this way, the applied pressure at each position on the blanket cylinder surface is detected.

〔Example〕

In FIGS. 1 and 2, 2 is a blanket cylinder, 5 is a blanket wrapped around the blanket cylinder 2, 6 is a gap provided with a metal fitting for attaching and tightening the blanket 5, 7 is a piezo film, and 8 and 8' are electrode pairs provided to sandwich the film 7, and 14 is a signal input section.

The arrangement of the rolls near the blanket cylinder 2 is the same as that shown in FIG. 6.

In FIG. 3, the compressive force in the direction of the thick arrow 8 is applied to the film 7.
, a piezoelectric voltage proportional to the force is generated and transmitted to the signal input section 14 in FIG. 1 via the electrode pair 8 or 8'. When the loosely inserted lower part of the blanket 5, which is generated by being pressurized by the mating roll, comes to the position a in FIG.
The generated voltage is sampled and transmitted to the reception analysis section 20 outside the machine. Furthermore, the lower part of the loose insertion moves and reaches the position tK in Figure 3.
When the voltage is reached, the generated voltage is sampled again from the electrode pair group 8, which has the same width and is shortened by a certain length, and is transmitted to the reception analysis section 20 outside the machine.

On the other hand, the receiving/analyzing section outside the machine obtains the axial profile of the applied voltage and the voltage generated at the electrode pair group 8' sampled at the position a in FIG. Next, the voltage generated by the electrode pair group 8 sampled at the position w in Figure 3 is corrected using the axial profile of the printing pressure obtained at the position a previously. Further, by calculating the difference in the generated voltage between adjacent electrode pairs of the electrode pair group 8, the generated voltage at a portion corresponding to the difference in length of the electrodes is extracted.

In this way, by performing calculations one after another, a profile of the printing pressure distribution in the circumferential direction can be obtained.6 Especially in recent years, with advances in microelectronics, the signal input section and analysis section are housed inside the machine, and the processing It is also possible to transmit and receive only the results outside the aircraft.

FIG. 4 is a block diagram of the signal input section 14 of the apparatus shown in FIG. It is something. 16 is an at9res generator, activated by the trigger from the trigger sensor 15,
Generates an address according to the sample position.

17 is an analog signal multiplexer which selects an electrode pair on the piezo film based on the address from the at9res generator 16 and transmits it to the address generator 16.

Transmitters 18 and 19 have the function of transmitting the At9less signal from the At9less generator 16 and the piezo voltage of the electrode pair selected by the analog multiplexer 17 to the outside of the machine. On the other hand, a reception analysis section 20 outside the machine receives and analyzes these signals to obtain the axial distribution and circumferential distribution of roll pressure.

In the figure, the transmission method from transmitters 18 and 19 is a wireless method, but it may also be a wired method that transmits to the outside of the aircraft via a slip ring installed on the axis of the blanket cylinder 2, or an optical transmission method. There may be. The trigger sensor 15 detects the position where the targeted mating roll is compressing the piezo film 7.
The film is mounted at a location on the blanket cylinder 2 so that a signal from an optical or magnetic generator provided externally can be detected at the position where the mating roll compresses the film.

Here, the piezo film 7 may be placed anywhere on the circumference of the blanket cylinder 2, and there is no limit to the number of piezo films 7. In addition, the piezo film 7 attached to the blanket 5
Depending on the thickness of the electrodes 8 and 8', they are integrated at the film processing stage so that there are no steps on the blanket 5, and are either wrapped around the blanket body to a uniform thickness or embedded on or inside the blanket 5. , the structure is such that the thickness and elasticity are uniform, similar to the above.

Further, the output lines from each electrode 8, 8' are matched to the thickness of the electrode, so that no step is formed on the blanket 5 due to a change in the printing pressure at this portion.

〔Effect of the invention〕

By implementing the present invention, it is possible to measure the axial profile and circumferential profile of the roll pressure between the blanket cylinder and other rolls during operation of the printing press, and the efficiency of printing pressure adjustment can be improved.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the printing pressure measuring device of the printing press of the present invention, FIG. 2 is an enlarged view of the piezo film and electrode pair group in FIG. 1, and FIG. 3 is a drawing for explaining the present invention in detail. Figure 3 (a) shows the deformation due to compression of the blanket cylinder, and Figure 3 (b) shows the deformation caused by the compression of the blanket cylinder.
FIG. 3(c) shows the pressing down of the blanket and piezo film corresponding to (a), and the arrangement of electrode pairs corresponding to FIG. 3(b). FIG. 4 is a block diagram of the signal input section of FIG. 1, and FIG. 5 is a diagram of the principle of generating piezo voltage. FIG. 6 is a roll arrangement diagram near a blanket cylinder of a printing press, and FIG. 7 is a schematic diagram of a conventional blanket cylinder. 2... Blanket body 5... Blanket 7.
...Piezo film 8...Electrode pair 14...Signal input section 20...Receiving analysis section Fig. 1 2- Bra) Cerato date 5- Brush Cerato 7- Piezo film 8- Den 4 Nishikari 14- I (Bow input large β 20-one receiver heavy input analysis section Fig. 3 Fig. 4 Fig. 5

Claims (1)

[Claims] A layer of piezo film is provided near the surface of the blanket cylinder of the printing press, and a plurality of independent electrode pairs are attached to the inner and outer surfaces of the piezo film, and the piezo film in the portion compressed when the blanket cylinder contacts the other roll. A printing pressure measuring device for a printing press, characterized in that the voltage generated at the blanket cylinder is detected through the electrode pair, and the compressive force generated on the surface of the blanket cylinder is measured as a pressure profile in the axial direction and the circumferential direction.