JP2009000996A - Liquid film thickness measuring device, liquid film thickness measuring method, and nip adjusting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid film thickness measuring device, and a liquid film thickness measuring method which enables the easy and precise measurement whether the thickness of a liquid film formed on a roller is uniform in the direction of a roller width or not with a simple constitution, and to provide a nip adjusting method which enables the easy and precise adjustment of a nip by a pair of rollers of an offset printing machine using the liquid film thickness measuring method. <P>SOLUTION: A roller is rotated for a definite time while pushing a blade 24 on the surface of the roller such as a transfer roller 11, so that a water film formed on the surface of the roller is scraped by the blade 24. A water film thickness formed on the surface of the roller is measured whether it is uniform or not in the direction of a roller width from a mass or a volume of the scraped water. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a liquid film thickness measuring device and a liquid film thickness measuring method for measuring whether or not the thickness of a liquid film formed on the surface of a roller is uniform in the width direction of the roller, and the above-mentioned This is a nip adjusting method for adjusting the nip between a pair of rollers in an offset printing machine using the liquid film thickness measuring method.

  Normally, in an offset printing machine, an image is formed by repulsion between ink and dampening water on a plate. Here, since the image quality is greatly affected by the amount of dampening water supplied on the plate, adjusting the amount of dampening water supplied with high accuracy is very important for stabilizing the printing quality. One of the important issues.

As shown in FIGS. 1 and 2, the amount of dampening water supplied during operation of the offset printing press is generally adjusted by adjusting the rotation speeds of the water source roller 12 and the transfer roller 11 in the water supply unit roller mechanism 10. . Here, the water source roller 12 is immersed in a water tank 13 that stores dampening water, and the transfer roller 11 receives water from the water source roller 12 and supplies this water to the water supply roller mechanism 10. It is to be sent to other rollers. In general, in an offset printing machine, a pair of blanket rollers are installed in contact with each other so as to form a nip portion, and offset printing is performed by sending a printed matter to the nip portion between the pair of blanket rollers. It is to be given. Here, FIG. 1 shows an example in which the water supply unit roller mechanism 10 is provided on the blanket roller on the lower side of the printed material, but in reality, the water supply unit roller mechanism 10 is provided on each of the pair of blanket rollers. Yes.
Thus, the adjustment of the rotation speeds of the water source roller 12 and the transfer roller 11 is based on the premise that the water supply amount is uniform in the width direction of the offset printing press. This is because in a non-uniform water supply state, not only does it cause printing troubles as it is, but also it may cause another printing trouble by adjusting the rotation speed, making it difficult to solve the problem.

  For example, when the printed matter is soiled due to insufficient water supply in a part of the plate surface of the offset printing press, in general, the water supply amount is increased by increasing the rotation speed of the water source roller 12 or the like. The problem will be solved, but as a result, the printed matter will not be smudged, but the water supply will increase as a whole. This causes other printing troubles such as gain increase. In such a state, it is difficult to immediately identify that the cause is caused by non-uniform water supply in an offset printing machine having many quality fluctuation factors. For this reason, managing the water supply amount so as to be uniform in the width direction of printing in the offset printing machine is one of the very important issues in efficiently managing the offset printing operation.

  The uniformity of the water supply amount in the width direction of the offset printing press is achieved by uniformly adjusting the nip between the water source roller 12 and the transfer roller 11 in the water supply unit roller mechanism 10 in the width direction. Once proper nip adjustment is performed, it is not necessary to repeatedly perform nip adjustment during continuous printing. However, when the offset printing press is stopped for a long time, it is necessary to separate the water source roller 12 and the transfer roller 11 in order to prevent partial deformation of the water roller 12. Therefore, at least the nip adjustment as described above is required before every start of the offset printing press.

  Conventionally, the nip adjustment as described above has been performed as follows according to the visual judgment and feeling of the operator (operator). That is, when the rollers 11 and 12 are rotated in a state where there is a gap between the water source roller 12 and the transfer roller 11, a wavy pattern due to a water film is formed on the surface of the water source roller 12 immersed in the water tank 13. It is formed. From this state, the operator first reduces the gap between the rollers 11 and 12 uniformly with the gap adjusting screw 14 in the printing width direction, and the wavy pattern on the water source roller 12 disappears to form a uniform water film thickness. Make adjustments as follows. A uniform water film thickness is formed when the water source roller 12 and the transfer roller 11 are in the kiss touch state, and the operator further sets a gap between the rollers 11 and 12 from the kiss touch state. Adjustment is completed by making the gap adjustment screw 14 smaller.

  However, with such a method, it is difficult to adjust the nip between the water source roller 12 and the transfer roller 11 uniformly in the width direction with high accuracy, and individual differences among workers in the adjustment accuracy increase. Therefore, as described above, various printing troubles due to poor setting of the water source roller 12 are caused, and in some cases, a lot of time is wasted or the material of the offset printing machine is damaged. It was happening.

  On the other hand, for example, Patent Document 1 proposes a method of performing nip adjustment with high accuracy by measuring the water film thickness formed on the metallic transfer roller 11 with a gloss meter. However, such a method has a problem that an expensive optical sensor is required for measuring the thickness of the water film formed on the surface of the roller. Furthermore, in order to continuously measure the water film thickness with high accuracy, maintenance work of the optical sensor is also required, so that it is considered that the practicality of the offset printing press at the printing site is poor.

JP-A-8-132585

  The present invention has been made in consideration of such points, and with a simple configuration, it is possible to accurately determine whether the thickness of the liquid film formed on the surface of the roller is uniform in the width direction of the roller. It is an object of the present invention to provide a liquid film thickness measuring apparatus and a liquid film thickness measuring method that can measure well. In addition, the present invention provides a nip adjustment method that can easily and accurately adjust the nip between a pair of rollers in an offset printing machine by using the liquid film thickness measurement method as described above. With the goal.

  The liquid film thickness measuring device of the present invention is a liquid film thickness measuring device for measuring whether or not the thickness of the liquid film formed on the surface of the roller is uniform in the width direction of the roller. A main body portion, a blade provided on the main body portion for scraping off a liquid film formed on the surface of the roller, a handle provided on the main body portion for gripping by an operator, and the main body portion. And a storage portion for storing the liquid scraped off by the blade, and the roller is scraped off by the blade when the roller rotates for a certain time in a state of pressing the blade against the surface of the roller. Based on the mass or volume of the liquid stored in the storage section, it is measured whether the thickness of the liquid film formed on the surface of the roller is uniform in the width direction of the roller. That And butterflies.

  According to such a liquid film thickness measuring apparatus, it is of a type that can be gripped by an operator with a handle, and scrapes off the liquid film formed on the surface of the roller by using a blade provided on the main body. Thus, a simple configuration can be achieved, and manufacturing costs and maintenance costs can be reduced. In addition, based on the mass or volume of the liquid scraped by the blade, it is measured whether the thickness of the liquid film formed on the surface of the roller is uniform in the width direction of the roller. In the measurement of the mass or volume of the liquid scraped off from such a roller, there is no individual difference among workers, and the measurement can be performed easily and accurately.

  In the liquid film thickness measuring apparatus of the present invention, the liquid may be water. In this case, as the liquid film formed on the surface of the roller, for example, a dampening water film in an offset printing machine is assumed.

  In the liquid film thickness measuring device of the present invention, it is preferable that a roller capable of running on the surface of the roller is provided on the main body. As a result, the operation of rotating the roller for a predetermined time while the blade is pressed against the surface of the roller can be performed more smoothly, and the angle of the blade with respect to the surface of the roller is made constant during the rotation of the roller. be able to.

  Here, the roller is provided with at least two pairs of right and left along the width direction of the roller along the circumferential direction of the roller. It is more preferable that the pair of left and right rollers located on the left side is located farther from the handle than the pair of left and right rollers located below. In this case, the position of each pair of rollers is such that the pair of upper left and right rollers protrude toward the roller side from the pair of lower left and right rollers, so that the operator can move the liquid to the roller. It becomes possible to press the film thickness measuring device from slightly below the horizontal direction. At this time, since the pair of left and right rollers on the upper side protrude toward the roller side than the pair of left and right rollers on the lower side, the operator tilts the liquid film thickness measuring device obliquely from below with respect to the rollers. The liquid film thickness measuring device can be pressed against the roller so as to be placed on the roller from above rather than applying a force upward. Therefore, the operator can easily press the liquid film thickness measuring device against the roller, and the operability of the liquid film thickness measuring device for the operator can be further improved.

  In the liquid film thickness measuring device of the present invention, it is preferable that the liquid film thickness measuring device further includes a holder for holding the blade on the main body so that the angle of the blade with respect to the surface of the roller is constant. As a result, the operation of scraping the liquid film formed on the surface of the roller with the blade can be further stabilized.

  Moreover, in the liquid film thickness measuring apparatus of this invention, it is preferable that the said main-body part consists of a member which has translucency. Thus, the operator can visually recognize the liquid stored in the storage unit, and the operability of the liquid film thickness measuring device for the operator can be further improved.

  In the liquid film thickness measuring device according to the present invention, the handle includes two bar members extending substantially parallel to the blade and a connecting member for connecting the two bar members to the main body. It is preferable that the space | interval between two bar members is a magnitude | size which an operator can hold | grip both bar members simultaneously. As a result, the handle has the shape of a so-called grip force meter, so that the operator can easily hold the handle, and the operability of the liquid film thickness measuring device for the operator can be further improved.

  The liquid film thickness measuring method of the present invention is a liquid film thickness measuring method for measuring whether or not the thickness of the liquid film formed on the surface of the roller is uniform in the width direction of the roller. A step of pressing a blade of a liquid film thickness measuring device against the surface of the roller, a step of rotating the roller for a predetermined time while pressing the blade against the surface of the roller, and a scraping from the roller by the blade Measuring whether or not the thickness of the liquid film formed on the surface of the roller is uniform in the width direction of the roller based on the mass or volume of the taken liquid. And

  According to such a liquid film thickness measuring method, the liquid film formed on the surface of the roller is scraped off by using a blade provided in the liquid film thickness measuring apparatus. The thickness measuring apparatus can be made simple, and the manufacturing cost and maintenance cost of the liquid film thickness measuring apparatus can be reduced. In addition, based on the mass or volume of the liquid scraped by the blade, it is measured whether the thickness of the liquid film formed on the surface of the roller is uniform in the width direction of the roller. In the measurement of the mass or volume of the liquid scraped off from such a roller, there is no individual difference among workers, and the measurement can be performed easily and accurately.

  In the liquid film thickness measuring method of the present invention, the liquid may be water. In this case, as the liquid film formed on the surface of the roller, for example, a dampening water film in an offset printing machine is assumed.

  In the liquid film thickness measuring method of the present invention, the blades of the liquid film thickness measuring device are sequentially pressed against the surfaces in the vicinity of the end portions on both sides of the roller, and the blades in the vicinity of the end portions on both sides thereof. By comparing the mass or volume of the liquid sequentially scraped from the roller by a preset reference value, the thickness of the liquid film formed on the surface of the roller is uniform in the width direction of the roller. It is preferable to measure whether or not there is. According to such a liquid film thickness measurement method, the thickness of the liquid film is measured on the surfaces of both ends of the roller, so the thickness of the liquid film formed on the surface of the roller is more accurately determined. It is possible to measure whether the thickness is uniform in the width direction of the roller.

  The nip adjusting method of the present invention is a nip adjusting method for adjusting a nip between a pair of rollers in an offset printing machine, and a liquid film is formed on the surface in the vicinity of both ends of one of the pair of rollers. A step of sequentially pressing the blades of the thickness measuring device, a step of rotating the one roller for a predetermined time in a state where the blade is pressed against the surface of the one roller, and end portions on both sides of the one roller By comparing the mass or volume of the liquid sequentially scraped by the blades in the vicinity with a preset reference value, the thickness of the liquid film formed on the surface of the roller is reduced in the width direction of the roller. A step of measuring whether or not it is uniform, and a measurement that the thickness of the liquid film formed on the surface of the roller is not uniform in the width direction of the roller. If so, the step of adjusting the nip between the pair of rollers, and again measuring whether the thickness of the liquid film formed on the surface of the rollers is uniform in the width direction of the rollers; It is provided with.

  According to the liquid film thickness measuring device and the liquid film thickness measuring method of the present invention, whether or not the thickness of the liquid film formed on the surface of the roller is uniform in the width direction of the roller with a simple configuration. Can be measured easily and accurately.

  Further, according to the nip adjusting method of the present invention, the nip adjustment between the pair of rollers in the offset printing press can be easily and accurately performed by using the liquid film thickness measuring method as described above.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 3 to 6 are diagrams showing an embodiment of a water film thickness measuring apparatus according to the present invention.
3 is a top view schematically showing the configuration of the water film thickness measuring apparatus according to one embodiment of the present invention, and FIG. 4 is a side view of the water film thickness measuring apparatus shown in FIG. It is. FIG. 5 is a diagram showing an operation of measuring the thickness of a water film formed on the surface of a roller such as a transfer roller of an offset printing machine by the water film thickness measuring device shown in FIGS. 6 is a side view of FIG.

  First, the outline of the water film thickness measuring apparatus in the present embodiment will be described with reference to FIGS. 3 and 4. The water film thickness measuring apparatus shown in FIG. 3 and FIG. 4 determines whether the thickness of the water film formed on the surface of a roller such as a metal transfer roller in an offset printing machine is uniform in the width direction of the roller. It is for measuring.

  As shown in FIGS. 3 and 4, the water film thickness measuring device 20 includes a main body portion 21 formed of a substantially rectangular parallelepiped housing, and a handle provided on the back side (lower side of FIG. 3) of the main body portion 21. 22, four rollers 23 provided in the main body 21, and a blade 24 for scraping off a water film formed on the surface of a roller such as the transfer roller 11. Hereafter, each component of such a water film thickness measuring apparatus 20 is explained in full detail.

  As described above, the main body 21 of the water film thickness measuring apparatus 20 is formed of a substantially rectangular parallelepiped housing, and a part of one surface thereof is open. For this reason, a storage portion 21 a for storing water scraped off from a roller such as the transfer roller 11 by the blade 24 is formed inside the main body portion 21. More specifically, as shown in FIG. 4, when the main body 21 of the water film thickness measuring device 20 is viewed from the side, the front edge of the bottom plate of the main body 21 (the right edge in FIG. 4) A return portion 21b protruding upward is formed. By such a return portion 21b, the water that has entered the main body portion 21 from the opening of the main body portion 21 does not escape to the outside, and thus the storage portion 21a is formed in the main body portion 21 in this way.

  The handle 22 is formed so as to extend straight from the back side (the side opposite to the side where the opening is provided) of the main body 21 and is configured to be gripped by an operator (operator).

  A total of four rollers 23 are provided in the main body 21. Specifically, as shown in FIG. 3, the pair of rollers 23 is symmetric with respect to the water film thickness measuring device 20, and as shown in FIG. Two sets are provided along the vertical direction of the measuring device 20. These rollers 23 can run on the surface of rollers such as the water source roller 12 and the transfer roller 11.

  The blade 24 is made of rubber, for example, and extends along the width direction of the main body 21 as shown in FIG. 3, and the size of the width is slightly smaller than the width of the main body 21. The blade 24 is provided with a holder 25 for holding the blade 24. The combination of the blade 24 and the holder 25 is held on the ceiling plate of the main body 21 by a pair of left and right holding members 26 so that the angle of the blade 24 with respect to the surface of the roller such as the transfer roller 11 is constant. A through hole extending in the left-right direction in FIG. 4 is formed in the holding member 26, and a holding rod 26 a for guiding the holding member 26 in the left-right direction in FIG. 4 is inserted into the through hole. The holding rod 26 a extends in the left-right direction in FIG. 4, and its base end is attached to the back plate of the main body portion 21. Since the holding member 26 can be moved in the left-right direction in FIG. 4 by such a holding rod 26a, the holding member 26 advances and retreats in the left-right direction in FIG. 4 while keeping the blade 24 parallel to the roller. And the position of the blade 24 can be adjusted appropriately.

  In such a water film thickness measuring device 20, when the blade 24 is pressed against the surface of a roller such as a metal transfer roller 11 of an offset printing machine, the blade 24 comes into contact with the surface of the roller, and the tip thereof Is warped along the surface of the roller. Then, as shown in FIG. 6, when the blade 24 is pressed against the surface of the roller such as the transfer roller 11 from the side, when the roller rotates for a certain time, the blade 24 is scraped and stored in the main body 21. Based on the amount of water stored in 21a, it is measured whether the thickness of the water film formed on the surface of the roller is uniform in the width direction of the roller.

  Next, a method for adjusting the nip between the water source roller 12 and the transfer roller 11 in the offset printing machine using the water film thickness measuring device 20 as described above will be described.

First, the operator adjusts the water supply amount as usual for the offset printing press.
Next, as shown in FIG. 5 and FIG. 6, when the operator holds the handle 22 of the water film thickness measuring device 20, the water film thickness measuring device is formed on the surface in the vicinity of the end portions on both sides of the transfer roller 11. Twenty blades 24 are sequentially pressed. In FIG. 5, the blade 24 of the water film thickness measuring device 20 is pressed against the surface of the outer peripheral surface of the transfer roller 11 in the vicinity of the end portion on the drive side (right side in FIG. 5). After the measurement work of the surface water film thickness in the vicinity of the end of the transfer roller 11, the measurement work of the surface water film thickness in the vicinity of the operation side (left side in FIG. 5) of the outer peripheral surface of the transfer roller 11 is continued. It will be.

  Next, in a state where the blade 24 is pressed against the surface of the transfer roller 11, the transfer roller 11 is rotated for a predetermined time. Specifically, for example, it is rotated for 1 minute. The rotation time of the transfer roller 11 is the same in the measurement work of the water film thickness of the surface in the vicinity of the operation-side end portion of the outer peripheral surface of the transfer roller 11 in the post process of the measurement work shown in FIG. When the transfer roller 11 is rotated with the blade 24 fixed, the water film formed on the surface of the transfer roller 11 is scraped off by the blade 24, and the scraped water is stored in the storage portion 21 a of the main body portion 21. Stored. In addition, the collection time of the water film formed on the surface of the transfer roller 11, that is, the rotation time of the transfer roller 11, and the mass of water stored in the storage unit 21a are in a proportional relationship.

  Next, the amount of water scraped off by the blade 24 and stored in the storage unit 21a is quantified by a mass method. Specifically, the mass of the water film thickness measuring device 20 is measured in advance, and after the water film formed on the surface of the transfer roller 11 is scraped off by the blade 24, the water film thickness measuring device 20 again. The mass of water stored in the reservoir 21a is calculated by measuring the mass and calculating the difference between the two.

  The mass of water scraped from the surface near the end on the driving side on the outer peripheral surface of the transfer roller 11 and the mass of water scraped from the surface near the end on the operating side of the outer peripheral surface of the passing roller 11 Are respectively compared with a preset reference value. In this way, quality determination is performed for each of the water supply amount on the drive side and the operation side. Here, when the difference from the reference value is large, nip adjustment between these rollers is performed on one side or both sides in the width direction of the pair of rollers until the difference becomes small, and the difference is formed on the surface of the transfer roller 11 again. It is measured whether the thickness of the water film is uniform in the width direction of the transfer roller 11. In this way, the mass of water scraped from the surface near the driving end on the outer peripheral surface of the passing roller 11 and the surface near the operating end on the outer peripheral surface of the passing roller 11 were scraped off. The nip adjustment between the pair of rollers and the measurement again by the water film thickness measuring device 20 are performed until the mass of water substantially matches the reference value. When all of these water masses substantially coincide with the reference value, it is determined that the desired nip adjustment has been performed, and the series of operations ends.

  As described above, according to the water film thickness measuring device 20 and the water film thickness measuring method of the present embodiment, the roller is rotated for a certain time while the blade 24 is pressed against the surface of the roller such as the transfer roller 11. Thus, the water film formed on the surface of the roller is scraped off by the blade 24, and the thickness of the water film formed on the surface of the roller is uniform in the width direction of the roller based on the mass of the scraped water. It is designed to measure whether or not. In this way, the water film thickness measuring device 20 is of a type that can be gripped by the operator with the handle 22, and the water film formed on the surface of the roller by using the blade 24 provided on the main body 21. Since it is made to scrape off, the said water film thickness measuring apparatus 20 can be made into a simple structure, and a manufacturing cost and a maintenance cost can be reduced. Further, since the thickness of the water film formed on the surface of the roller is measured in the width direction of the roller based on the mass of water scraped off by the blade 24, this is the case. In the measurement of the mass of water scraped from the roller, there is no individual difference among workers, and the measurement can be performed easily and accurately.

  Further, according to the nip adjusting method of the present embodiment, by using the water film thickness measuring method as described above, it is passed between a pair of rollers in the offset printing machine, specifically, for example, the water source roller 12. The nip adjustment with the roller 11 can be easily and accurately performed.

  Here, in the water film thickness measuring device 20, since the roller 23 that can run on the surface of the transfer roller 11 or the like is provided on the main body 21, the blade 24 is pressed against the surface of the roller. The operation of rotating the roller for a predetermined time can be performed more smoothly, and the angle of the blade 24 with respect to the surface of the roller can be made constant during the rotation of the roller.

  Further, since a holder 25 is provided for holding the blade 24 on the main body 21 so that the angle of the blade 24 with respect to the surface of the roller such as the transfer roller 11 is constant, the water film formed on the surface of the roller is The operation of scraping by 24 can be further stabilized.

  Further, in the above-described water film thickness measuring method, the blade 24 of the water film thickness measuring device 20 is sequentially pressed against the surface in the vicinity of both ends of the transfer roller 11 or the like, and the ends on both sides thereof By comparing the mass of water sequentially scraped from the roller by the blade 24 in the vicinity of the portion with a preset reference value, the thickness of the water film formed on the surface of the roller can be determined in the width direction of the roller. Whether or not it is uniform is measured. For this reason, since the thickness of the water film is measured on the surface of the roller in the vicinity of both the driving side and the operating side, the thickness of the water film formed on the surface of the roller is more accurately determined. It becomes possible to measure whether or not it is uniform in the width direction.

  The liquid film thickness measuring device, the liquid film thickness measuring method, and the nip adjusting method according to the present invention are not limited to the above-described configuration, and various changes can be made. For example, the object of measurement is not limited to the water film formed on the surface of the roller, but can be, for example, an ink film formed on the surface of the roller, or other liquid film You can also. When the object of measurement is an ink film formed on the surface of the roller, the printing machine is set under the condition that the amount of ink supplied to the printing machine is uniform in the width direction, and idling is performed. Thereafter, if the amount of ink on the roller at an arbitrary position in the inker is quantified by the liquid film thickness measuring device according to the present invention, ink key adjustment and roller adjustment can be performed accurately and simply.

  Further, after scraping off the liquid film formed on the surface of the roller by the blade, the volume may be measured instead of measuring the mass of the liquid stored in the storage unit. Even in this case, it is possible to measure whether or not the thickness of the liquid film formed on the surface of the roller is uniform in the width direction of the roller.

  Further, the main body portion may be formed of a translucent member, for example, a transparent or translucent acrylic plate. Accordingly, the operator can visually recognize the water stored in the storage unit, and the operability of the water film thickness measuring device for the operator can be further improved.

  Still another water film thickness measuring apparatus according to the present invention will be described with reference to FIG. FIG. 7 is a top view schematically showing the configuration of another water film thickness measuring apparatus.

  A handle 32 in another water film thickness measuring apparatus as shown in FIG. 7 connects two bar members 32 a extending substantially in parallel with the blade 24, and connects these two bar members 32 a to the main body 21. It is comprised from the connection member 32b. And the space | interval between these two bar members 32a is a magnitude | size which an operator can hold | grip both the bar members 32a simultaneously. For this reason, as shown in FIG. 7, since the handle 32 has a so-called grip force meter shape, the operator can easily hold the handle 32, and the operability of the water film thickness measuring device for the operator is further improved. be able to.

  Still another water film thickness measuring device according to the present invention will be described with reference to FIGS. 8 and 9 are side views showing an outline of the configuration of still another water film thickness measuring apparatus.

  As shown in FIGS. 8 and 9, in still another water film thickness measuring device, a total of four rollers 33 a and 33 b are provided in the main body 31. Here, each roller 33a, 33b is provided in two pairs along the circumferential direction of the roller, such as a pair of left and right along the width direction of the transfer roller 11 or the like. As shown in FIGS. 8 and 9, the positions of the rollers 33 a and 33 b of each set with respect to the main body 31 are set to the left and right positions when the operator holds the handle 22 with the handle 22 in a substantially horizontal state. The pair of rollers 33a is positioned farther from the handle 22 than the pair of left and right rollers 33b below. That is, the pair of left and right rollers 33a on the upper side protrude toward the transfer roller 11 side than the pair of left and right rollers 33b on the lower side.

  The positional relationship between the rollers 33a and 33b is as shown in FIG. 9, that is, the pair of upper left and right rollers 33a are directed toward the passing roller 11 rather than the pair of left and right rollers 33b below. Therefore, the operator can press the water film thickness measuring device against the transfer roller 11 from slightly below the horizontal direction (see FIG. 8). At this time, the operator places the water film thickness measuring device on the transfer roller 11 so that the water film thickness measuring device is placed on the transfer roller 11 from above instead of applying a force obliquely upward from below. It can be pressed against the transfer roller 11. For this reason, the worker can easily press the water film thickness measuring device against the transfer roller 11, and the operability of the water film thickness measuring device for the worker can be further improved.

  Still another water film thickness measuring apparatus according to the present invention will be described with reference to FIGS. FIG. 10 is a configuration diagram showing an outline of another water supply roller mechanism of the offset printing machine, and FIG. 11 shows a water film thickness measuring device applied to another water supply roller mechanism as shown in FIG. It is a side view which shows the outline of a structure.

  FIG. 10 shows an outline of another water supply roller mechanism 40 in the offset printing machine. As shown in FIG. 10, in the water supply roller mechanism 40, the amount of dampening water supplied during the operation of the offset printing press is adjusted by adjusting the rotational speeds of the water source roller 42 and the transfer roller 41. Here, the water source roller 42 is immersed in a water tank 43 that stores dampening water, and the transfer roller 41 receives water from the water source roller 42 and sends this water to other rollers. It has become.

  As shown in FIG. 10, a water film thickness measuring device 50 is applied to the transfer roller 41. Here, since the transfer roller 41 in the water supply section roller mechanism 40 as shown in FIG. 10 is an open space above the transfer roller 41, the water film thickness measuring device 50 is connected to the transfer roller 41 from above the transfer roller 41. 41 can be pressed.

  As shown in FIG. 11, the water film thickness measuring device 50 is composed of a base 55 having a substantially rectangular parallelepiped casing and having an opening on the top, and four rollers provided on the bottom of the base 55. 53, a support arm 56 attached to the base body 55, a blade 54 supported by the support arm 56 for scraping off a water film formed on the surface of a roller such as the transfer roller 41, and the tip of the support arm 56. The storage part 51a which is provided and stores the water scraped off by the blade 54 is provided with the storage member 51 provided inside.

  A handle 52 is formed on the upper surface of the base 55. The handle 52 is composed of two bar members 52a and 52b provided in openings on the upper surface of the base 55 so as to extend substantially parallel to the blade 54, respectively. And the space | interval between these two bar members 52a and 52b is a magnitude | size which an operator can hold | grip both bar members 52a and 52b simultaneously. For this reason, since the handle 52 has a so-called grip force meter shape, the operator can easily hold the handle 52, and the operability of the water film thickness measuring device for the operator can be further improved.

  According to the water film thickness measuring device 50 as shown in FIG. 11, the storage member 51 provided therein with the blade 54 and the storage portion 51 a for storing the water scraped off by the blade 54 is provided for each of the support arms 56. Even if the water is scraped off from a roller such as the transfer roller 41 or the like having a small surrounding space because it is provided near the tip, the transfer roller is inserted by the blade 54 by inserting the support arm 56 into the narrow space. Water is scraped off from the rollers 41 and the like, and the scraped water can be stored in the storage portion 51a.

It is a block diagram which shows the outline of the water supply part roller mechanism of an offset printing machine. It is a block diagram which shows the detailed structure of the transfer roller in the water supply part roller mechanism of FIG. It is a top view which shows the outline of a structure of the water film thickness measuring apparatus in one embodiment of this invention. It is a side view of the water film thickness measuring apparatus shown in FIG. It is a figure which shows the operation | movement which measures the thickness of the water film formed in the surface of rollers, such as a transfer roller of an offset printing machine, by the water film thickness measuring apparatus shown to FIG. FIG. 6 is a side view of FIG. 5. It is a top view which shows the outline of a structure of the water film thickness measuring apparatus in other embodiment of this invention. It is a figure which shows the operation | movement which measures the thickness of the water film formed in the surface of rollers, such as a transfer roller of an offset printing machine, by the water film thickness measuring apparatus in further another embodiment of this invention. It is a side view of the water film thickness measuring apparatus shown in FIG. It is a block diagram which shows the outline of the other water supply part roller mechanism of an offset printing machine. It is a side view which shows the outline of a structure of the water film thickness measuring apparatus applied to another water supply part roller mechanism as shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Water supply part roller mechanism 11 Delivery roller 12 Water source roller 13 Water tank 14 Gap adjustment screw 20 Water film thickness measuring device 21 Main body part 21a Storage part 21b Return part 22 Handle 23 Roller 24 Blade 25 Holder 26 Holding member 26a Holding rod 31 Main body 32 Handle 32a Bar member 32b Connecting member 33a, 33b Roller 40 Water supply roller mechanism 41 Transfer roller 42 Water source roller 43 Water tank 50 Water film thickness measuring device 51 Storage member 51a Storage unit 52 Handles 52a, 52b Bar member 53 Roller 54 Blade 55 Base 56 Support arm

Claims (11)

A liquid film thickness measuring device for measuring whether or not the thickness of the liquid film formed on the surface of the roller is uniform in the width direction of the roller,
The main body,
A blade provided on the main body for scraping off a liquid film formed on the surface of the roller;
A handle provided on the main body for an operator to hold;
A storage section that is provided in the main body section and stores the liquid scraped off by the blade;
With
Based on the mass or volume of the liquid scraped off by the blade and stored in the storage section when the roller rotates for a certain time with the blade pressed against the surface of the roller, the surface of the roller A liquid film thickness measuring apparatus which measures whether or not the thickness of a liquid film to be formed is uniform in the width direction of the roller.   2. The liquid film thickness measuring device according to claim 1, wherein the liquid is water.   The liquid film thickness measuring device according to claim 1, wherein a roller capable of running on the surface of the roller is provided on the main body.   The roller is provided with at least two pairs of right and left along the width direction of the roller along the circumferential direction of the roller. 4. The liquid film thickness measuring device according to claim 3, wherein the pair of rollers are located on the side farther from the handle than the pair of left and right rollers located below.   5. The liquid film thickness according to claim 1, further comprising a holder that holds the blade on the main body so that the angle of the blade with respect to a surface of the roller is constant. measuring device.   The liquid film thickness measuring apparatus according to claim 1, wherein the main body portion is made of a translucent member.   The handle includes two bar members extending substantially parallel to the blade and a connecting member that connects the two bar members to the main body. The liquid film thickness measuring device according to any one of claims 1 to 6, wherein the liquid film thickness measuring device is sized so that a person can hold both rod members simultaneously. A liquid film thickness measuring method for measuring whether or not the thickness of the liquid film formed on the surface of the roller is uniform in the width direction of the roller,
Pressing the blade of the liquid film thickness measuring device against the surface of the roller;
Rotating the roller for a certain period of time with the blade pressed against the surface of the roller;
Measuring whether the thickness of the liquid film formed on the surface of the roller is uniform in the width direction of the roller based on the mass or volume of the liquid scraped off from the roller by the blade; ,
A liquid film thickness measuring method comprising:   9. The liquid film thickness measuring method according to claim 8, wherein the liquid is water.   The mass of the liquid film thickness measuring device is sequentially pressed against the surface in the vicinity of the ends on both sides of the roller, and the liquid is sequentially scraped from the roller by the blade in the vicinity of the ends on both sides of the roller. Alternatively, by comparing the volume with a preset reference value, it is measured whether the thickness of the liquid film formed on the surface of the roller is uniform in the width direction of the roller. The liquid film thickness measuring method according to claim 8 or 9. A nip adjustment method for adjusting a nip between a pair of rollers in an offset printing machine,
A step of sequentially pressing the blades of the liquid film thickness measuring device respectively against the surfaces in the vicinity of the ends on both sides of one of the pair of rollers;
Rotating the one roller for a predetermined time in a state where the blade is pressed against the surface of the one roller;
By comparing the mass or volume of the liquid sequentially scraped by the blades in the vicinity of both end portions of the one roller with a preset reference value, the liquid film formed on the surface of the roller Measuring whether the thickness is uniform in the width direction of the roller;
When it is measured that the thickness of the liquid film formed on the surface of the roller is not uniform in the width direction of the roller, nip adjustment between the pair of rollers is performed, and the liquid film is formed on the surface of the roller again. Measuring whether the thickness of the liquid film is uniform in the width direction of the roller;
A nip adjusting method characterized by comprising:

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