JPH11309845A - Water content monitoring device for printing sheet and water content controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a quality fault according to a sheet water content by supplying accurate sheet water content information to an operator during printing, supplying a dryer temperature and a guide of a supply water amount regulation, and maintaining the sheet water content constant without operation. SOLUTION: An apparatus for monitoring and controlling a water content of a printing sheet 10 in a printer having a drying step, a folding step and the like comprises a water content monitoring device of a printing sheet having a measuring unit A21 for measuring a water content immediately before printing, a sheet moistening unit 17 after the drying step, a measuring unit B22 for measuring a water content immediately after moistening, a means for comparing a water content value of a sheet immediately after the printing with a predetermined threshold value level to decide and generating an alarm, and the like, and a water content controller having a means for comparing a difference between the water content value immediately before the printing and the water content value after the moistening with a predetermined threshold value level to regulate a dampening amount of the unit 17 and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitor device for monitoring the moisture content of paper used in a printing press and a control device for keeping the moisture content constant. More specifically, the present invention relates to a cutting device in a bookbinding process. The present invention relates to an apparatus for preventing defects such as irregularity, core dropout, and back cracks.

[0002]

2. Description of the Related Art Conventionally, the moisture content of paper of an offset rotary printing press has been measured off-line before an operator sets paper on a paper feeder. I went offline. That is, the operator visually observes the measurement result and the printed book, pulls the fold to determine whether the water content is high or low, and changes the temperature of the dryer and the amount of water supplied to the water supply device to the paper. Was.

[0003] However, the above-mentioned conventional technique has the following problems. In other words, although the moisture content of the outer paper and the inner paper differ in the take-up paper, only the outer paper can be measured in the offline measurement, and the wrap around the paper is removed, and after a while, the surrounding paper is removed. There is a problem that the moisture content of the paper changes due to the influence of humidity. Therefore, since the value measured off-line and the actual value are different for the above reason, the correction amount of the water supply amount cannot be determined from the difference in the water content, and the operator must rely on the intuition. For this reason, particularly in bookbinding, which is a post-process, troubles such as irregular cutting, core slippage, and back cracking rarely occur.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art. It is an object of the present invention to measure in real time the paper moisture content in-line and provide an operator with the paper under printing. Providing accurate moisture content information, providing guidelines for adjusting dryer temperature and water supply to paper, and keeping paper moisture content constant without operator operation, resulting in paper moisture content It is an object of the present invention to provide a water content monitoring device and a water content control device for a printing paper, which can eliminate quality defects.

[0005]

In order to achieve the above-mentioned objects, the present invention first provides a method for measuring the water content of printing paper on a printing machine having a drying step, folding and cutting steps. In the monitoring apparatus, the following means are used: (a) means for measuring the moisture content at an arbitrary position on the sheet immediately before printing; (b) means for humidifying the sheet after the printing and drying steps; (c) printing and Means for measuring the water content at any position on the paper immediately after humidifying the paper after the drying step,
(D) means for comparing and determining the water content value of the sheet immediately before printing with a predetermined threshold level and issuing an alarm;
Means for comparing and determining the moisture content of the humidified paper with a predetermined threshold level and issuing an alarm; (f) determining the moisture content of the paper immediately before printing and the moisture content of the humidified paper Means for determining the difference, comparing and determining the difference with a predetermined threshold level, and issuing an alarm; (g) calculating the ratio of the moisture content value of the paper immediately before printing to the moisture content value of the humidified paper, A means for comparing and judging the threshold value with the threshold level and issuing an alarm.

[0006] In the invention of claim 2, according to claim 1,
Among the means of the water content monitoring device of the printing paper described in the above,
(I) to (c), and at least one of (d) to (g), which is a device for monitoring the moisture content of printing paper.

According to the third aspect of the present invention, the means for measuring the water content in (a) and (c) includes a mechanism for adjusting the movement so that the measurement can be performed on the same line in the printing direction. 3. A device for monitoring the water content of printing paper according to claim 1 or 2.

Further, in the invention of claim 4, the means for measuring the water content in the above (a) and (c) is provided on a guide roller of a paper.
A device for monitoring the moisture content of printing paper according to 2 or 3.

According to a fifth aspect of the present invention, there is provided an apparatus for controlling the water content of a printing sheet on a printing press including a drying step, a folding step, and a cutting step. Means for measuring the moisture content at any position in
(B) means for humidifying the paper after the printing and drying steps,
(C) means for measuring the water content at an arbitrary position on the paper immediately after humidification of the paper that has undergone the printing and drying steps; (d) comparing the water content value of the paper immediately before printing with a predetermined threshold level Means for judging and issuing an alarm; (e) means for comparing and judging the moisture content value of the humidified paper with a predetermined threshold level to issue an alarm; (f) moisture content value of the paper immediately before printing And the difference between the moisture content value of the paper after the humidification,
Means for comparing and determining with a predetermined threshold level and issuing an alarm; (g) calculating a ratio of a moisture content value of the paper immediately before printing to a moisture content value of the humidified paper, and Means for comparing and determining and issuing an alarm; (h) determining the difference between the moisture content value of the paper immediately before printing and the moisture content value of the paper after the humidification, and comparing and determining with a predetermined threshold level; (B) means for adjusting the humidification amount of the humidification means, (iii) the water content value of the paper immediately before printing,
Among the means for adjusting the humidification amount of the humidification means of (b) based on the ratio of the humidified paper to the moisture content value of the humidified sheet and comparing and determining the ratio with a predetermined threshold value level, the result is obtained.
An apparatus for controlling the water content of printing paper, comprising (c) and (h).

[0010] According to the invention of claim 6, in the invention of claim 5,
Of the means for controlling the water content of the printing paper described in (a),
To (c) and (i), which is a device for controlling the water content of printing paper.

Further, in the invention of claim 7, the means for measuring the water content in (a) and (c) includes a mechanism for adjusting the movement so that the measurement can be made on the same line in the printing direction. An apparatus for controlling the water content of printing paper according to claim 5 or 6.

8. The printing paper according to claim 5, wherein the means for measuring the water content in (a) and (c) is provided on a paper guide roller. This is a water content control device.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a water content monitoring device and a water content control device of a printing paper according to the present invention will be described in detail with reference to the drawings.

First, FIG. 1 shows a typical offset rotary printing press (3), showing the installation position of a measuring device for measuring the water content of printing paper, and the like. The flow of the printing paper (10) exits the paper feeder (11), passes through the infeed (12) that stabilizes the flow of the printing paper (10), and enters the printing unit (13) to be printed. After being printed, it is thermally dried by a dryer (14) and then cooled by a cooling roller (15). Next, the paper enters a folding machine (18) through a web path section (16) for stabilizing the flow of paper. In the web path section (16), there is a paper humidifier (17) for replenishing lost water.

The increase or decrease of paper moisture in the printing process is achieved by absorbing moisture transferred from the blanket in the printing unit (13), losing moisture in the dryer (14), and absorbing moisture from the paper humidifier (17). The paper humidifier (17) mistes water or some kind of aqueous solution into printing paper (1).
0) to humidify the printing paper (10)
There are a method of applying atomized water to a rubber roller and transferring it to a printing paper (10), and a method of using static electricity in order to give it to the whole. Printing paper is also affected by the humidity in the factory.

In the present invention, it is preferable to carry out the measurement at the following places in consideration of the portion which affects the moisture content of the paper. That is, among the means provided in the water content monitoring device and the water content control device of the printing paper of the present invention, (A)
A measuring device A (21) as a means for measuring the moisture content at an arbitrary position on the sheet immediately before printing is installed after the infeed section (12) for controlling meandering, wrinkles, etc. of the printing sheet (10), (C) The measuring device B (22) as a means for measuring the moisture content at an arbitrary position of the paper immediately after the paper that has undergone the printing and drying steps is humidified is installed after the paper humidifier (17).

The measuring device A (21) is provided with a printing paper (1).
The measuring device B (22) measures the moisture content of the printing paper (10) through the paper humidifier (17) and absorbs the moisture evaporated by the dryer (14) or the like. The measurement is performed at the stage where the measurement is performed.

Further, the measurement position in the direction perpendicular to the flow direction of the printing paper is determined by the operator according to the picture. In the invention according to claim 3 or 7, as shown in FIG. ) Or a mechanism (4) for moving and adjusting the measuring instrument B (22) in the direction (P) perpendicular to the flow direction of the printing paper (10). The measuring device A (21) or the measuring device B (22) is fixed to a linear guide (23), and a timing belt (24).
The timing guide belt (24) is driven by a servo motor (25) to move the linear guide (23). Further, the measuring device A (21) or the measuring device B (22) controls the servomotor (25) by the sequencer (26) so as to move to the same position. At this time, there is no problem regarding the meandering of the sheet without any particular consideration because there is a meandering correction device in the infeed section (12) and the web path section (16).

The measured values obtained from the measuring instrument positioned as described above are used as follows. That is, in the case of the paper surface water content monitoring device, when the water content obtained by the measuring device A (21) and the water content obtained by the measuring device B (22) are compared with the predetermined threshold value for each, and the threshold value level is exceeded. Then, a warning is issued by voice, light, etc., to alert the operator. Since these are online information, the operator can immediately respond to the temperature change of the dryer (14) and the humidifier condition of the paper humidifier (17) shown in FIG. it can.

Also, as data used for the monitor,
Instead of the measured value itself, a value obtained by the measuring device A (21) may be used as a reference, and a difference value or a quotient value from the value obtained by the measuring device B (22) may be used as judgment data. good.
Also in this case, similarly, a threshold value is compared with a predetermined threshold value, and when the threshold value is exceeded, a warning is issued by voice, light, or the like to alert the operator.

FIG. 3 shows the operation flow from the measurement of the water content of the printing paper (10) to the warning as described above.

Next, the apparatus for controlling the water content of printing paper according to the present invention will be described. The value measured by the measuring device A (21) is the original moisture content of the paper, and is the most stable value in the environment used for the printing paper (10). Then, this value is finally compared with a measuring device B (22) for determining the water content of the printing paper (10), and becomes a target value for water supply control of the paper humidifier (17) (however, this target value is It may be replaced by a fixed constant or a function of the measured value of the measuring device A (21)). FIG. 4 shows an operation flow from the measurement of the water content of the printing paper (10) to the control of the paper humidifier (17). The operation flow will be described. First, the difference between the measured value A measured by the measuring device A (21) and the measured value B measured by the measuring device B (22) is obtained, and this value is multiplied by a gain. The sum of this value and the existing value is a signal for appropriately changing the water supply amount of the paper humidifier (17) (when the ratio of B to measured value A is taken,
The value obtained by dividing the existing value by the value obtained by multiplying this value by the gain is a signal for appropriately changing the water absorption of the paper humidifier (17). The paper humidifier (17) receives this signal and changes the amount of water supply. This operation is repeated until an end signal is received.

By controlling the paper humidifier (17) and stabilizing the water content of the paper in this way, it is possible to eliminate irregularities in cutting after bookbinding, defects such as stuck-out needles and back cracks. .

Finally, FIG. 5 shows a method for measuring the moisture content of the paper.
Shown in The measuring device A (21) and the measuring device B (22) for measuring the water content comprise a light source (31), a rotating interference filter (32), and a light receiving section (34), and the light emitted from the light source (31). Passes through the rotation interference filter (32), is reflected by the printing paper (10), and enters the light receiving section (34). At this time, the rotational interference filter (32) is equipped with two filters, filter a (35) ₁ That reference light lambda, passes light of a wavelength that is not affected by moisture. Filter b (36) moisture measurement light lambda ₂ that is, a filter passing light of a wavelength absorbed only in the water, by rotating them, reference light lambda _1, to obtain a moisture measuring light lambda ₂ it can. Absorbance X is obtained from the electric signal obtained by the light receiving section (34), and the paper surface moisture content is obtained by substituting into the following relational expression. Paper surface moisture content [%] I = aX + b

Further, as shown in FIG.
Or B (21, 22) portion (light source, light source lens system (3
3), the rotation interference filter, and the light receiving unit) are arranged directly above the paper guide roller (39) and separated from the printing paper (10) by a specified distance (d), so that the flapping of the printing paper (10) is reduced. Effect removal, back side of printing paper (10
The removal of the incident light from (a) and the stabilization of the intensity of the reflected light on the paper back surface (10a) are performed, and a stable signal with a good SN is obtained.

[0026]

As described above, the present invention has the following effects. That is, on a printing machine that includes a drying step, folding, and cutting steps, the following means: a means for measuring the moisture content at an arbitrary position on the sheet immediately before printing; a means for humidifying the sheet after the printing and drying steps; Means for measuring the water content at any position on the paper immediately after humidification of the paper after the drying step, means for comparing and determining the paper water content value immediately before printing with a predetermined threshold level, and means for issuing an alarm, Means for comparing and determining the moisture content value of the paper after humidification with a predetermined threshold level, issuing a warning, obtaining the difference between the moisture content value of the paper immediately before printing and the moisture content value of the paper after humidification, Means for issuing a warning by comparing with the determined threshold level, determining the ratio of the moisture content value of the paper immediately before printing to the moisture content value of the paper after humidification, and comparing and determining with a predetermined threshold level to issue an alarm. Emitting means for printing Because it is monitoring the moisture content device, by providing an accurate moisture content information of the paper being printed on the operator, it is possible to provide guidance of the water supply amount adjusting to the dryer temperature and paper.

The difference between the moisture content value of the paper immediately before printing and the moisture content value of the humidified paper is determined by means provided in the above-described printing paper moisture content monitoring device, and the difference is compared with a predetermined threshold level. Judging means for adjusting the humidification amount of the humidifying means from the result, and / or determining the ratio of the moisture content value of the paper immediately before printing to the moisture content value of the paper after humidification, and a predetermined threshold value A water content control device comprising means for comparing and judging with the level and adjusting the humidification amount of the humidifying means based on the result, so that the water content of the paper is kept constant without operation by an operator, Quality defects caused by the above can be eliminated.

Further, since the moisture content measuring device immediately before printing or immediately after humidifying the paper is set on the paper guide roller, the influence of the flapping of the paper, the removal of incident light from the back of the paper, and the The intensity of the reflected light on the back surface is stabilized, and there is an effect that a stable signal with good SN is obtained.

Therefore, according to the present invention, irregularities in cutting, staple removal, and the like in the bookbinding process of printed matter printed by an offset rotary press or the like are provided.
Excellent practical effect in the prevention of back cracking etc.

[Brief description of the drawings]

FIG. 1 is an explanatory view schematically showing an overall view of one embodiment of an offset rotary printing press according to the present invention.

FIGS. 2A and 2B are schematic diagrams illustrating a mechanism for moving the printing paper in a direction perpendicular to the flow direction of the printing paper according to the present invention, and FIG.
Is a top view thereof. (B) is a side view thereof.

FIG. 3 is an operation flow of the printing paper moisture content monitoring device according to the present invention.

FIG. 4 is an operation flow of a control method of a paper humidifying apparatus according to the present invention.

FIG. 5 is an explanatory view showing an outline of an embodiment of a measuring method of a moisture content measuring device according to the present invention, and (a) is an overall view thereof. (B) is a front view of a rotary interference filter which is a part of the filter.

FIG. 6 is an explanatory diagram showing an embodiment of a positional relationship of a moisture content measuring device according to the present invention in a side cross section.

[Explanation of symbols]

 3 Offset rotary printing press 4 Movement adjustment mechanism of measuring instrument 10 Printing paper 10a Backside of printing paper 11 Paper feeder 12 Infeed unit 13 Printing unit 14 Dryer 15 ‥‥ Cooling roller 16 ‥‥ Web path 17 ‥‥ Paper humidifier 18 ‥‥ Folding machine 19 ‥‥ Printed product unloading section 21 ‥‥ Measuring device A 22 ‥‥ Measuring device B 23 ‥‥ Linear guide 24 ‥‥ Timing belt 25 ‥ ‥ Servo motor 26 ‥‥ Gear 27 ‥‥ Sequencer 28 ‥‥ Timing roll 29 ‥‥ Linear guide rail 31 ‥‥ Light source 32 ‥‥ Rotating interference filter 33 ‥‥ Optical lens system 34 ‥‥ Light receiving unit 35 ‥‥ Filter a 36 ‥ {Filter b 37} Rotating body 38} Support shaft 39} Paper guide roll P {Direction perpendicular to the flow direction of printing paper d} Paper and instrument specified distance A or B

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Morikazu Hirota 1-5-1, Taito, Taito-ku, Tokyo Inside Toppan Printing Co., Ltd. (72) Yoshikazu Shimamura 1-5-1, Taito 1-5-1, Taito-ku, Tokyo No. Letterpress Printing Co., Ltd.

Claims (8)

[Claims] An apparatus for monitoring the water content of a printing paper on a printing press having a drying step, folding and cutting steps, comprises the following means: (a) water content at an arbitrary position of the paper immediately before printing; (B) means for humidifying the paper that has undergone the printing and drying steps; (c) means for measuring the moisture content at any position on the paper immediately after humidifying the paper that has undergone the printing and drying steps; Means for comparing and determining the moisture content of the paper immediately before printing with a predetermined threshold level and issuing an alarm; (e) comparing and determining the moisture content of the humidified paper with a predetermined threshold level. Means to issue an alarm, (f)
Means for obtaining a difference between the moisture content value of the paper immediately before printing and the moisture content value of the paper after humidification, comparing and determining the difference with a predetermined threshold level, and issuing an alarm; Means for determining the ratio of the moisture content value to the moisture content value of the paper after humidification, comparing with a predetermined threshold level and issuing an alarm, and issuing a warning. . 2. A means for monitoring the moisture content of printing paper according to claim 1, wherein said means comprises (a) to (c) and at least one of (d) to (g). Characteristic device for monitoring the moisture content of printing paper. 3. The method according to claim 1, wherein the means for measuring the water content in (a) and (c) comprises a mechanism for adjusting the movement so that the same line can be measured in the printing direction. 3. The apparatus for monitoring the moisture content of printing paper according to 1 or 2. 4. The printing paper according to claim 1, wherein the means for measuring the water content of (a) and (c) is provided on a paper guide roller. Rate monitoring device. 5. An apparatus for controlling the water content of a printing sheet on a printing press having a drying step, folding and cutting steps, comprising the following means: (a) the water content at an arbitrary position of the sheet immediately before printing; (B) means for humidifying the paper that has undergone the printing and drying steps; (c) means for measuring the moisture content at any position on the paper immediately after humidifying the paper that has undergone the printing and drying steps; Means for comparing and determining the moisture content of the paper immediately before printing with a predetermined threshold level and issuing an alarm; (e) comparing and determining the moisture content of the humidified paper with a predetermined threshold level. Means for issuing a warning, (f) means for obtaining a difference between the moisture content value of the paper immediately before printing and the moisture content value of the paper after humidification, comparing and determining the difference with a predetermined threshold level, and issuing an alarm; (G) the water content value of the paper immediately before printing, Means for determining the ratio of the moisture content of the wet paper to a predetermined threshold level and issuing an alarm; (h) the moisture content of the paper immediately before printing and the moisture content of the wet paper (B) means for adjusting the humidification amount of the humidification means (b) based on the result, and (iii) the humidification value of the water content value of the paper immediately before printing. Determine the ratio to the moisture content value of the paper after, and compare and determine with the predetermined threshold level,
A water content control apparatus for printing paper, comprising (a) to (c) and (h) among the means for adjusting the humidification amount of the humidification means of (b) based on the result. 6. The water content of a printing paper according to claim 5, wherein said means for controlling the water content of a printing paper comprises (a) to (c) and (i). Control device. 7. The means for measuring the water content of (a) and (c) comprises a mechanism for adjusting the movement so that the same line can be measured in the printing direction. 7. The water content control device for printing paper according to 5 or 6. 8. The printing paper according to claim 5, wherein the means for measuring the water content in (a) and (c) is provided on a paper guide roller. Rate control device.