JP2011240582A - Duct roller for rainbow printing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To propose a duct roller which can be partitioned at more than one places bordering on the grooves in a duct roller where the grooves are prepared in parts corresponding to ink weirs for rainbow printing.SOLUTION: The invention refers to a duct roller which is equipped with belt-like grooves in positions corresponding to ink weirs in order to supply ink of two or more colors with one duct roller in offset printing and which is composed of a roller shaft which has fixed parts of concave or convex section in straight line shape parallel to the longitudinal direction of the duct roller and of two or more split rollers of ring shape which are removable from and are arranged on the roller shaft, and on the roller body and inside of the grooves the fixed parts of the concave or the convex section which are able to be inserted into the fixed parts prepared on the roller shaft are formed.

Description

The present invention relates to a rainbow printing duct roller for reducing an operator's work load such as roller replacement in an offset printing system.

For example, when printing securities, banknotes, and the like, rainbow printing is performed in which printing patterns are printed in a plurality of colors in the width direction to prevent counterfeiting and blur the border between adjacent colors. The rainbow printing method consists of a duct roller (also called an ink discharge roller), a bottom plate, and an ink fountain formed by an ink weir. The ink fountain is divided into a plurality of sections in the width direction according to the plate design. Intermediate ink weirs are provided, and inks having different hues are accommodated in adjacent divided areas (see, for example, Patent Document 1).

A plurality of ink films having different hues are formed on the surface of the ink discharge roller in the width direction from the gap with the bottom plate by the rotation of the duct roller. The plurality of ink films are transferred to the calling roller, and further, the ink is supplied to the downstream roller group formed by the kneading roller and the shaking roller. Adjacent colors are mixed by mixing the ink film boundaries of the matching hues, then transferring to the surface of the plate on the plate cylinder and transferring it from the plate to the printing paper through the blanket surface on the blanket cylinder. It is possible to give a display that blurs the border of the rainbow like a rainbow color.

With respect to the ink fountain mechanism for rainbow printing as described in Patent Document 1, it is possible to supply a plurality of colors of ink at a time by using a plurality of ink weirs in one duct roller. In addition, although it can be displayed in a rainbow-like color at the portion where two adjacent inks are mixed, in the duct roller cleaning operation, etc., with respect to the removal and installation of a plurality of arranged ink weirs It was accompanied by a great work load.

Therefore, there is a method in which a plurality of ink weirs are set in advance at predetermined intervals on the ink tray, and installed together with the ink tray in which the ink weirs are set so as to contact the duct roller (for example, patents) Reference 2).

In addition, there is a method in which a plurality of ink weirs are attached to a holder, the holder is fixed to one stage, and the stage is attached and detached so as to come into contact with the duct roller (see, for example, Patent Document 3).

However, the ink fountain configuration for rainbow printing described in Patent Document 2 and Patent Document 3 has an ink weir once for a normal duct roller (a roller having a flat surface on which nothing is applied to the duct roller itself). In such a configuration, during continuous printing, the two colors of ink are mixed through a slight gap between the ink weir and the duct roller (hereinafter referred to as “ This is called “mixed color”).

When using the prior art as described above, removal of the ink weir is an efficient operation because it can be performed at one time, and although the work load on the operator is reduced, color mixing is undesirable in terms of quality. There was a problem that occurred.

Therefore, as a method for preventing this color mixture, a mechanism is disclosed in which a belt-like groove is provided in the duct roller at the location where the ink weir is arranged in order to make the contact between the ink weir and the duct roller dense (for example, patents). Reference 4).

Japanese Utility Model Publication No. 6-46675 JP 2005-153476 A JP 2005-193508 A JP 2005-144984 A

However, the ink fountain configuration for rainbow printing disclosed in Patent Document 4, especially the duct roller provided with a belt-like groove, can prevent the mixing of two adjacent inks, but prints different printing patterns. In this case, it is necessary to replace the duct roller and install a duct roller provided with a belt-like groove suitable for a new printed pattern. Further, it is necessary to replace the duct roller even when the belt-like groove is worn away by the ink weir due to long-term printing. When replacing the duct roller, the drive mechanism, frame, and related parts in which the duct roller is installed must be removed, which requires a work load and a large replacement time.

An object of the present invention is to solve such a conventional problem. In a duct roller provided with a groove at a position corresponding to an ink weir for rainbow printing, a plurality of divisions can be performed with the groove as a boundary. A possible duct roller is proposed.

In the offset printing method, in order to supply at least two colors of ink by one duct roller, a belt-like groove is formed at a position corresponding to an ink weir for separating two or more colors of ink in an ink fountain. A rainbow printing duct roller having a roller shaft having a second fixed portion of a linear recess or projection parallel to the longitudinal direction of the duct roller, and removable on the roller shaft A plurality of ring-shaped split rollers are arranged, and the split roller includes a roller body for transferring ink and a groove portion having a diameter smaller than the surface of the roller body. A rainbow-printing duct roller characterized in that a convex or concave first fixing part that can be fitted with a second fixing part provided on the shaft is formed. A.

The roller shaft in the rainbow printing duct roller of the present invention has at least one second fixing portion, and the second fixing portions are provided in the same number and corresponding positions as the first fixing portions. It is characterized by being.

The plurality of divided rollers in the rainbow printing duct roller of the present invention are all characterized by having the same width or at least one different width.

The dividing roller groove in the rainbow printing duct roller of the present invention is provided on one of the side surfaces in all of the plurality of dividing rollers.

The dividing roller groove in the rainbow printing duct roller of the present invention is provided on both sides of the side surface in all of the plurality of dividing rollers.

In the rainbow printing duct roller of the present invention, when the divided roller groove portions are provided on both sides of the side surface of the roller, the groove width of one divided roller is approximately ½ of the width of the ink weir. .

The second fixing portion in the rainbow printing duct roller of the present invention is characterized in that it is formed by a single concave portion or convex portion on a straight line.

The second fixed portion in the rainbow printing duct roller of the present invention is formed by a plurality of concave portions or convex portions divided on a straight line.

The rainbow printing duct roller according to the present invention forms a single duct roller by combining a plurality of divided rollers. Therefore, unlike the conventional duct roller, it is not necessary to remove the drive mechanism, the frame, and related parts. Since the split roller can be removed simply by opening the opening mechanism, the operator can easily replace it in a short time.

The rainbow printing duct roller according to the present invention can prepare a plurality of divided rollers having different roller widths, and can easily and quickly cope with a change in the printed pattern by combining the divided rollers.

Since the rainbow printing duct roller of the present invention can prepare a plurality of divided rollers having different roller widths once to cope with the change of the print pattern by the combination thereof, the change of the print pattern etc. Since it is not necessary to prepare a new duct roller and process a belt-like groove each time, the cost can be reduced.

In the rainbow printing duct roller of the present invention, since the dividing roller can be separated into the main body portion and the groove portion, even if the groove portion is worn away by the ink dam during long-term printing, only the worn and worn groove portion is replaced. The replacement work can be made more efficient and cost can be reduced.

The rainbow printing duct roller replacement method of the present invention does not require handling of heavy objects such as a driving mechanism and a frame at the time of replacement, so that the safety of workers can be maintained.

It is a figure explaining the unit for offset printing to which the rainbow printing roller in this invention was attached. It is a figure which shows the roller for rainbow printing in this invention. It is a figure for demonstrating the roller for rainbow printing comprised by the some division | segmentation roller. It is a figure which shows the structure of a division | segmentation roller. It is a figure explaining the groove part in a division | segmentation roller. It is a block diagram of the rainbow printing roller in the present invention. It is a figure for demonstrating the fixing jig for fixing the position of a division | segmentation roller. It is a figure which shows the example of a fixing jig. It is a figure for demonstrating the fixing | fixed part in a division | segmentation roller and a roller shaft. It is a figure which shows the example of the 2nd fixing | fixed part in a roller shaft. It is a figure which shows the example of arrangement | positioning of the fixing | fixed part in a division | segmentation roller and a roller shaft. It is a figure for demonstrating the replacement | exchange operation | work of a duct roller. It is a figure for demonstrating the detailed structure of the flame | frame which fixes a roller axis | shaft.

Embodiments for carrying out the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the embodiments described below, and includes various other embodiments within the scope of the technical idea described in the claims.

Hereinafter, a rainbow printing roller according to the present invention will be described with reference to the drawings. FIG. 1A is a top view of an offset printing unit (1) provided with a rainbow printing roller (hereinafter referred to as “duct roller”) according to the present invention, and FIG. It is the figure seen from the side.

The offset printing unit (1) includes an ink fountain (2) for charging ink, a duct roller (3) that is a feature of the present invention in contact with the ink fountain (2), and the ink on the duct roller. The rubber-like calling roller (6) for transferring to the other roller, the kneading roller (7) for receiving and kneading ink from the calling roller (6), and an appropriate color mixture at the boundary between different inks adjacent to each other In order to make (rainbow), it is comprised by the swing roller (8) which reciprocates in the X direction of Fig.1 (a).

In the ink fountain (2) and the duct roller (3), at least two colors of ink (4a and 4b) are put in order to perform rainbow printing. A plurality of weirs (5) are arranged. By this ink weir (5), for example, the first ink (4a) and the second ink (4b) are not mixed in the ink fountain (2).

In addition, if only different inks are separated by the ink weir (5), a slight amount of leakage occurs between the ink weir (5) and the ink fountain (2) or the duct roller (3) as the printing time elapses. Therefore, when adjacent inks are mixed with each other or when the desired rainbow printing cannot be performed, as shown in FIG. 2, a notch that allows the ink weir (5) to be fitted on the duct roller (3) ( (Concave part) (11) is provided.

The notch (11) on the duct roller (3) is cut at a position corresponding to the ink weir (5), and for that position, two adjacent colors of ink are printed on the pattern to be printed. This is the position where rainbow printing is performed by mixing colors. Therefore, when the pattern is changed, it is necessary to replace it with a duct roller (3) having a cut (11) corresponding to the pattern.

As shown in FIG. 1A, the duct roller (3) is provided with a frame (9) for supporting the roller and a drive gear (10) for rotating the roller on both sides of each roller. Therefore, in the replacement work of the duct roller (3), the frame (9) and the drive gear (10) must be disassembled.

On the other hand, as shown in FIG. 3, the duct roller (3) according to the present invention is composed of a plurality of divided rollers (12), and the troublesome driving gear ( 10) and the frame (9) can be easily replaced without dismantling. This replacement work will be described later.

FIG. 4 is a view for explaining a plurality of divided rollers (12) constituting the duct roller (3) of the present invention. As shown in FIG. 4A, the dividing roller (12) is composed of a roller body (13) for transferring ink and a groove (14) corresponding to a notch (11) for fitting the ink weir (5). It is configured.

The groove (14) may be provided at one end of the roller body (13) as shown in FIG. 4 (a), or may be provided on the roller body (13) as shown in FIG. 4 (b). It may be provided at both ends. When the groove portions (14) are provided at both ends of the roller body (13), when the two adjacent divided rollers (12) are combined, the total width (Y) of the combined groove portions (14a and 14b) is the ink weir ( The width must be 5). Therefore, the individual widths of the groove portions (14a and 14b) at both ends of the roller body (13) need only satisfy the relationship of Y = 14a + 14b. Therefore, it is not always necessary to set 14a = 14b. In consideration of the correspondence, it is preferable to set 14a = 14b = Y / 2.

Moreover, as shown in FIG. 5, the division | segmentation roller (12) may be able to isolate | separate a roller main body (13) and a groove part (14). By making it separable, it is possible to replace only the roller body (13) even when the duct roller (3) is replaced in accordance with the change of the rainbow print pattern, or when the divided roller (12) is damaged or worn out. Since the groove portions (14) all have the same width, the same groove portion (14) can be used over and over, which leads to cost reduction.

Next, the configuration of the duct roller (3) in which a plurality of divided rollers (12) are combined will be described. FIG. 6 is a diagram illustrating the configuration of the duct roller (3). As described above, the duct roller (3) is configured by arranging a plurality of divided rollers (12). Each divided roller (12) has a ring shape as shown in FIG. It has become. In FIG. 6A, for the sake of explanation, the integrated duct roller (3) is used. However, in reality, the duct roller (3) is composed of a plurality of divided rollers (12).

By fitting this ring-shaped divided roller (12) to the roller shaft (17) shown in FIG. 6B, the duct roller (3) is completed. Therefore, the inner diameter of the ring of the split roller (12) and the outer diameter of the roller shaft (17) are substantially equal. This abbreviation means that the roller shaft (17) can be fitted into the ring of the split roller (12). Therefore, the outer diameter of the roller shaft (17) is slightly larger than the inner diameter of the ring. The roller shaft (17) needs to be small, but if the outer diameter of the roller shaft (17) is too small, the roller shaft (17) will move in the ring, so that the roller shaft (17) does not move in the ring. Are substantially equal.

In addition, the divided roller (12) must rotate during printing in the same way as the roller shaft (17), insufficient rotation due to ink adhesion, some ring inner diameter and outer diameter of the roller shaft (17). In order to prevent shortage of rotation due to the difference between the first fixing portion (15) and the first fixing portion (15), the split roller (12) is provided with a first fixing portion (15) as shown in FIG. The roller shaft (17) is provided with a second fixing portion (16) having a shape that can be fitted with each other. The description about this fixing | fixed part is mentioned later.

Furthermore, a fixing jig (18) as shown in FIG. 6B is provided at both ends of the roller shaft (17) in order to fix the positions of both ends of the divided roller (12). The fixing jig (18) will be described with reference to FIGS.

The form of the fixing jig (18) is not particularly limited, and it is possible to fit the divided roller (12) along the roller shaft (17), and after fitting, the divided rollers (12 ) As long as the position can be fixed.

As an example of the fixing jig (18), as shown in FIG. 7A, a pin-shaped fixing jig (18) may be used. FIG. 7B illustrates the pin-shaped fixing jig 18 shown in FIG. 7A in more detail. If no external force is applied to the pin-shaped fixing jig (18), the pin-shaped fixing jig (18) protrudes from a predetermined position of the roller shaft (17). However, as shown in FIG. When an external force is applied to the fixing jig (18) from the vertical direction (the arrow direction in the drawing), the fixing jig (18) is housed inside the roller shaft (17). This is because the pin-shaped fixing jig (18) is projected from the inside of the roller shaft (17) using the force of the spring, and when an external force repelling the spring force is applied, the pin-shaped fixing jig ( 18) is housed inside. Therefore, when the dividing roller (12) is fitted into the roller shaft (17), the dividing roller (12) may be fitted while pushing the pin-shaped fixing jig (18) from the vertical direction. When the external force from the vertical direction is not applied when the fitting of 12) is completed, the pin-shaped fixing jig (18) naturally protrudes by the force of the spring, and the position of the end split roller (12) is fixed. It becomes possible.

Further, as another example of the fixing jig (18), as shown in FIG. 8A, a ring-shaped fixing jig (18) may be used. FIG. 8B and FIG. 8C illustrate the ring-shaped fixing jig (18) in more detail. As shown in FIG. 8B, the ring-shaped fixing jig (18) is provided with a recess (19) in which the ring-shaped fixing jig (18) can be fitted into the roller shaft (17). A ring-shaped fixing jig (18) is fitted. For example, as shown in FIG. 8C, the ring-shaped fixing jig (18) is formed into a ring shape by fixing a member divided into two with screws or the like (20). In FIG. 8C, the upper and lower portions are completely separated, but a configuration in which only one of them can be separated may be used.

Next, each fixed part of a division | segmentation roller (12) and a roller axis | shaft (17) is demonstrated. As described above, the fixing portion has a role of appropriately rotating the dividing roller (12) when the dividing roller (12) is fitted to the roller shaft (17), and the dividing roller (12). There is also a role to serve as a guide for fitting the roller to the roller shaft (17).

For example, as shown in FIG. 9A, each of the fixing portions has a concave shape with respect to the ring-shaped interior of the divided roller (12), and the roller shaft (17) is fitted into the concave shape. A convex shape is possible. Further, as an opposite aspect, as shown in FIG. 9B, a convex shape is formed with respect to the ring-shaped inside of the divided roller (12), and the roller shaft (17) is fitted into the concave shape. It is good also as possible concave shape. Thus, the 2nd fixing | fixed part (16) of a division | segmentation roller (12) and the 1st fixing | fixed part (15) of a roller axis | shaft (17) should just be a shape which can be fitted.

Further, the fixed portion, particularly the second fixed portion (16) provided on the roller shaft (17) may be integrated as shown in FIG. 10 (a), but as shown in FIG. 10 (b). In addition, there may be a certain interval.

Further, each fixing portion may be provided at least at one place as shown in FIG. 11 (a), or at two places as shown in FIG. 11 (b) or at three places as shown in FIG. 11 (c).

Next, the exchange work of the rainbow printing duct roller in the present invention will be described.

In order to efficiently replace the duct roller (3) of the present invention, the offset printing unit (1) for installing the duct roller (3) has an operation side (on the non-gear side) as shown in FIG. The opening portion (21) that can be opened and closed or removed with a width that is partially larger than the diameter of the duct roller (3) may be provided in the attachment portion of the roller shaft (17) of the frame (9). FIG. 12 (a) shows a state in which the open portion (21) is closed, that is, a state in which a so-called duct roller (3) is installed, and FIG. 12 (b) shows a state in which the duct roller (3) is removed. The state which opened the open part (21) is shown.

As shown in FIG. 13, the bearing (22) of the roller shaft (17) is attached to the frame (9) having the opening (21).

The bearing portion (22) is provided with a spun ring (23) and a bearing (24). By removing the spun ring (23), the roller shaft (17) and the bearing (24) are opened. The support is movable up and down, left and right, and does not apply a load to the roller shaft (17) when replacing the duct roller (3), thereby facilitating the replacement work.

Specifically, since the roller shaft (17) and the bearing (24) are fixed by the spun ring (23), the spun ring (23) is removed. At this time, the duct roller (3) is supported by a roller support (not shown). Next, the open part (21) of the frame (9) is opened, and the duct roller (3) is pulled out. At this time, before the duct roller (3) is completely removed, the roller shaft (17) is supported by another roller support (not shown).

When only the roller shaft (17) is reached, the duct roller (3) is sequentially inserted from the opening (21) of the operation side (non-gear side) frame (9). After the duct roller (3) is inserted, the opening (21) of the frame (9) is closed, and the roller shaft (17) and the bearing (24) are fixed by the spun ring (23).

DESCRIPTION OF SYMBOLS 1 Offset printing unit 2 Ink fountain 3 Duct roller 4 Ink 5 Ink weir 6 Ink roller 7 Kneading roller 8 Shaking roller 9 Frame 10 Drive gear 11 Notch 12 on a duct roller Dividing roller 13 Roller body 14 Groove part 15 First fixed part 16 Second fixing portion 17 Roller shaft 18 Fixing jig 19 Fixing jig recess 20 Fixing jig screw 21 Opening portion 22 Bearing portion 23 Span ring 24 Bearing bearing

Claims (8)

In the offset printing method, in order to supply at least two colors of ink by one duct roller, a rainbow having a belt-like groove at a position corresponding to the ink weir for separating the two or more colors in the ink fountain. A duct roller for printing, wherein the duct roller is removable on the roller shaft having a linear fixing portion that is a linear recess or projection parallel to the longitudinal direction of the duct roller. A plurality of ring-shaped division rollers are arranged, and the division roller includes a roller main body for transferring the ink and a groove portion having a diameter smaller than the surface of the roller main body, and the inner side of the roller main body and the groove portion. Is formed with a first fixed portion of a convex portion or a concave portion that can be fitted with a second fixed portion provided on the roller shaft. Nbo printing duct roller. The roller shaft includes at least one second fixing portion, and the second fixing portions are provided in the same number and corresponding positions as the first fixing portions. The rainbow printing duct roller according to claim 1. 3. The rainbow printing duct roller according to claim 1, wherein all of the plurality of divided rollers have the same width or at least one different width. 4. 4. The rainbow printing duct roller according to claim 1, wherein a groove portion of the dividing roller is provided on one of the side surfaces of all of the plurality of dividing rollers. 5. The rainbow printing duct roller according to any one of claims 1 to 3, wherein the groove portions of the dividing rollers are provided on both sides of the plurality of dividing rollers. 6. The groove portion of one of the divided rollers is approximately ½ of the width of the ink weir when the groove portions of the divided roller are provided on both sides of the side surface of the roller. Duct roller for rainbow printing. The rainbow printing duct roller according to any one of claims 1 to 6, wherein the second fixing portion is formed by a single concave portion or convex portion on a straight line. The rainbow printing duct roller according to any one of claims 1 to 6, wherein the second fixing portion is formed by a plurality of concave portions or convex portions divided on a straight line.

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