JP3005190U - Perforating blade for flexo plate - Google Patents

Abstract

(57) [Summary] [Purpose] A perforating blade that can perforate flexographic plates without producing perforation marks or burrs. [Structure] The flexo plate perforating blade 19 includes a boring cylindrical portion 2
A plurality of chevron-shaped protrusions 21 are provided continuously at the tip of 0 and in the axial direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a punching blade for punching a flexible sheet such as a flexographic plate.

[0002]

[Prior art]

 As a punching blade for punching a flexible sheet such as a flexo plate, a so-called zero-blade 5 having no protrusion in the axial direction of the boring cylinder has been conventionally used as a punching punch for packing or the like. . 11 (1) is a cross-sectional view of the zero-edged blade 5, and FIG. 11 (2) is a front view. When the flexographic plate is perforated by using the zero-edged blade 5, the perforated traces of the concentric circles of the blade remain on the surface of the flexographic plate on which the blade hits. When the flexographic plate is a plastic plate or a surface plastic coated plate, there is a problem that the plastic cracks and flash occurs. There is also the problem that the resistance at the time of perforation increases due to the reaction of the line cutting force on the entire cutting edge. In addition, if the boring cylindrical part is hollow, the boring scraps will be clogged with the boring cylindrical part, and the scraps must be removed after each drilling, and continuous drilling work cannot be performed. For this reason, there is a drilling blade with a hole for scraps to be scraped out like a skin punch, but since the scraps have a large frictional resistance when moving in the hollow part to the scrap hole, they are continuous. When the holes are drilled, the resistance at the time of drilling is further increased, and there is also a problem that traces of holes that are concentric with the blade and burrs that are concentric with the blade on the back surface are more strongly generated.

[0003]

[Problems to be solved by the device]

 An object of the present invention is to provide a perforating blade capable of continuously perforating a flexible sheet such as a flexographic plate without traces of perforation or burrs and without requiring a large force.

[0004]

[Means for Solving the Problems]

 The present invention is a perforating blade for flexographic printing plates, characterized in that it has a blade having a plurality of chevron-shaped projections provided in the axial direction in a continuous manner at the tip of the boring cylinder.

Further, the present invention is characterized in that it has a blade which is continuously provided at the tip of the bored cylindrical portion and has 4 to 10 protrusions in the axial direction.

Further, the present invention is characterized in that an injection pin elastically urged by a compression spring is provided inside the boring cylindrical portion.

[0007]

[Action]

 According to the present invention, a perforated cylindrical portion having a perforated blade having a plurality of protrusions in the axial direction of the perforated cylindrical portion is used for perforating a flexible sheet such as a flexographic plate. FIG. 10 is a cross-sectional view illustrating a situation where the flexographic plate 10 is cut by the blade 2. When the blade 2 comes into contact with the flexographic plate 10, the surface of the flexographic plate 10 is extended as shown in FIG. 10 (1), and the blackened perforation marks 3 are formed on the extended portion. When the surface is cut, the cutting progresses smoothly due to the molecular cohesive force indicated by the arrow as shown in FIG. 10 (2). When the blade 2 reaches the back surface of the flexographic plate 10, the back surface is extended as shown in FIG. 10 (3), and this remains as a flash 4 after cutting as shown in FIG. 10 (4). When the blade is a 0-blade blade as described in the prior art, the traces of drilling and burrs remain on the flexographic plate concentrically with the blade, but if a blade with multiple protrusions in the axial direction of the boring hole is used, Since only the nose contacts the surface of the flexographic plate, the trace of perforation only remains near the contact area. Similarly, burrs only occur near the protrusions. In this way, it is possible to perforate with almost no perforation marks or burrs.

The number of protrusions is preferably 4 to 10. If the number of protrusions is less than 4, the plastic part may crack if the flexographic plate is a plastic plate or surface plastic coated plate. If the number of protrusions exceeds 10, it becomes difficult to manufacture, which is not preferable.

Further, according to the present invention, since the inject pin is provided in the bored cylindrical portion and the inject pin is elastically biased by the compression spring, the perforated waste is continuously extruded from the inside of the hole. Can be perforated.

[0010]

【Example】

 FIG. 1 is a sectional view of a flexographic plate punching blade 19 having four chevron-shaped projections 21 in the axial direction, which is one embodiment of the present invention, and FIGS. FIG. 3 is a cross-sectional view of a flexographic plate punching blade 19 having 8 and 10 protrusions 21. FIGS. 1 to 4A are vertical sectional views, and FIG. 4B is a sectional view taken along the section line B-B in each of FIGS. Since the piercing blade 19 is provided with not only the plurality of projections 21 but also a circumferentially continuous blade in other portions, the surface of the flexographic plate is first formed with the projections 21 to form a small hole. The adjacent part is cut diagonally. Similarly, on the back surface of the flexographic plate, holes are first formed by the projections 21 and the adjacent portions are cut obliquely. As a result, there is no trace of perforation on the front surface and no flash on the back surface.

FIG. 5 is a cross-sectional view for explaining the operation of punching the flexographic plate 10. The flexographic plate 10 is placed on a substrate 11, and a female die 12 is provided on the substrate 11 at the position where the perforation is to be made. The boring cylindrical portion 20 is held by the supporting frame plate 17 and the supporting plate 16 so as to be perpendicular to the substrate 11. A compression spring 23 provided between the support frame plate 17 and the support plate 16 pushes up the roll pin 50 buried in the bored cylindrical portion 20. The lower end of the boring cylindrical portion 20 is housed so that the injection pin 22 elastically urged by the compression spring 23 and the projection 21 of the blade 19 do not project from the support plate 16. The upper end 25 of the boring cylindrical portion 20 is in contact with the pressing cam 18, and the pressing cam 18 is rotated by the eccentric sliding shaft 51. The operating lever 13 is projected to the outside of the column 14 in order to rotate the pressing cam 18, and by operating this, the pressing cam 18 can be rotated and the drilled cylindrical portion 20 can be pushed down. When the operating lever 13 is operated, the boring cylindrical portion 20 is pushed down against the compression spring 15 via the pressing cam 18, the projection 21 of the blade 19 abuts on the flexographic plate 10, and then the blade 19 as a whole is flapped. The lexographic plate 10 is punched. When the boring is finished, the blade 19 enters the female die 12, and the eject pin 22 is projected by the compression spring 23 to eject the boring dust. In this state, when the operation lever 13 is returned to its original position, the boring cylindrical portion 20 is returned to the state shown in FIG. 5 by the compression spring 15.

As described above, in order to provide the injection pin 22 and the compression spring 23 in the boring cylindrical portion 20, the following configuration is preferable, but not limited to these.

FIG. 6 is a cross-sectional view showing an example of a configuration in which the compression spring 23 and the injection pin 22 are inserted into the boring cylindrical portion 20a. A hollow cylindrical portion 20a having a step 24 is formed, and the injection pin 22 is inserted from the opposite direction of the blade 19 so that the head 26 abuts on the step 24, and then the compression spring 23. Insert. Finally, the cylindrical pin plug 27 is press-fitted.

FIG. 7 is a cross-sectional view showing another example of inserting the compression spring 23 and the injection pin 22 into the bored cylindrical portion 20b. This embodiment also has substantially the same configuration as the embodiment of FIG. 6, and the same members are designated by the same reference numerals. It should be noted that in this embodiment, the bored cylindrical portion 20b is provided with the internal screw 28, and the screw plug 27a is provided with the external screw 29, so that the bored cylindrical portion 20b is screwed. The plug 27a is screwed.

FIG. 8 is a sectional view showing still another example in which the compression spring 23 and the injection pin 22 are inserted into the boring cylindrical portion 20c. It should be noted that, in this embodiment, the compression spring 23 and the injector pin 22 are set by the setting member 30 and inserted into the boring cylindrical portion 20c from the side where the blade 19 is present. The setting member 30 is provided with a step 34, which supports the head 26 of the injector pin 22. Here, a commonly used spring plunger can be used. The side of the boring cylindrical portion 20c on the side of the blade 19 is hollow, and an inner screw 31 is engraved therein, and is screwed into an outer screw 32 engraved on the set member 30 to inject the compression spring 23 and the injector. The pin 22 and the boring cylindrical portion 20c are inserted.

FIG. 9 is a cross-sectional view showing still another example of inserting the compression spring 23 and the injection pin 22 into the bored cylindrical portion 20d. Also in this embodiment, the compression spring 23 and the injector pin 22 are inserted from the side where the blade 19 is present into the bored cylindrical portion 20d in which the inner screw 31 is engraved. In this case, after inserting the compression spring 23 and the injector pin 22, a cap 35 having an external thread 32 engraved therein is screwed. The cap 35 has a hole 36 into which the injector pin 22 is inserted, and the head 26 of the injector pin 22 is supported.

[0017]

[Effect of device]

 As described above, according to the present invention, since a flexible sheet such as a flexographic plate is perforated by using a blade having a plurality of protrusions in the axial direction of the boring portion, it is possible to form perforations without traces or burrs. Obtainable. In addition, it does not require a large force when drilling.

Further, according to the present invention, since the inject pin is provided in the bored cylindrical portion and the inject pin is elastically urged by the compression spring, the perforated waste is extruded from the inside of the hole and continuously. Can be perforated.

[Brief description of drawings]

FIG. 1 is a perforating blade for flexographic printing plate 1 according to an embodiment of the present invention.
9 is a sectional view of FIG.

FIG. 2 is a perspective view of a flexographic plate punching blade 19 according to another embodiment of the present invention.
FIG.

FIG. 3 is a perforating blade for flexographic printing plate according to a third embodiment of the present invention.
FIG.

FIG. 4 is a perforating blade for flexographic printing plate according to a fourth embodiment of the present invention.
FIG.

FIG. 5 is a cross-sectional view illustrating the operation of punching the flexographic plate 10 using the punching blade 19 of the present invention.

FIG. 6 is a cross-sectional view of an embodiment of a boring cylindrical portion 20a having a flexographic plate punching blade 19 of the present invention.

FIG. 7 is a sectional view of another embodiment of a boring cylinder portion 20b having a flexographic plate punching blade 19 of the present invention.

FIG. 8 is a cross-sectional view of another embodiment of a boring cylindrical portion 20c having a flexographic plate punching blade 19 of the present invention.

FIG. 9 is a cross-sectional view of another embodiment of a boring cylindrical portion 20d having a flexographic plate punching blade of the present invention.

FIG. 10 is a cross-sectional view illustrating a state when the flexographic plate 10 is punched with a blade 2.

FIG. 11 is a cross-sectional view of a conventional flexographic plate punching blade 5.

[Explanation of symbols]

 10 Flexographic Plate 19 Perforating Blade for Flexographic Plate 20, 20a, 20b, 20c Bore Cylindrical Part 21 Protrusion 22 Inject Pin 23 Compression Spring

Claims (3)

[Scope of utility model registration request] 1. A perforating blade for flexographic printing plate, comprising a blade continuously provided at the tip of a boring cylindrical portion and having a plurality of chevron-shaped projections in the axial direction. 2. The perforating blade for flexographic printing plate according to claim 1, further comprising a blade having four to ten protrusions provided in the axial direction in a continuous manner at the tip of the boring cylindrical portion. 3. The punching blade for a flexographic plate according to claim 1, wherein an injection pin elastically biased by a compression spring is provided inside the boring cylindrical portion.