WO2017122461A1 - Pre-processing device and pre-processing method - Google Patents

Abstract

To provide a pre-processing device and pre-processing method with which it is possible to process a elastic-material sheet made of a metal into a cylindrical shape to a high degree of accuracy. A pre-processing method in which a pre-processing device 3, used before a rectangular elastic-material sheet 21 made of a metal is processed and molded into a cylindrical printing plate 2, is employed, wherein the pre-processing method is provided with: a step for applying a bending process to one end section 221 of the elastic-material sheet 21; and a step for applying a bending process, at a curvature smaller than that at the one end section 221 of the elastic-material sheet 21, to the other end section 222 of the elastic-material sheet 21.

Description

Pre-processing apparatus and pre-processing method

The present invention relates to a pre-processing apparatus and a pre-processing method for processing a metal elastic material sheet into a cylindrical shape.

Conventionally, it is known that a printing plate having an image pattern and formed in a cylindrical shape is mounted on a plate cylinder of a printing apparatus and printed on a metal can body.

The printing plate is bent by, for example, winding a metal flat plate around a plate cylinder, and both ends of the flat plate are overlapped and joined into a cylindrical shape.

Patent Document 1 includes an upper roll and two lower rolls arranged on the entry side and the exit side of the work material, respectively, and a metal plate passed between the upper roll and the two lower rolls. It is disclosed to impart a bending process.

JP 06-304664 A

However, as in Patent Document 1, when a metal plate to be a printing plate is formed into a cylindrical shape, particularly when formed into a small-diameter cylindrical shape, a large degree of processing is required. When it is molded, there is a possibility that defects such as wrinkles, cracks, and distortion occur in the printing plate after molding.

Also, when processing a metal plate in stages, both ends of the metal plate come into contact when both ends of the metal plate processed into a substantially cylindrical shape are processed into a cylindrical shape in the next work process, etc. Therefore, it often takes time and effort for processing.

The preferred embodiments of the present invention have been made in view of the above and / or other problems in the related art. Preferred embodiments of the present invention can significantly improve existing methods and / or apparatus.

In view of the above-described technical background, an object of the present invention is to provide a pre-processing apparatus and a pre-processing method capable of processing a metal elastic material sheet into a cylindrical shape with high accuracy.

Other objects and advantages of the present invention will be apparent from the following preferred embodiments.

In order to achieve the above object, the present invention has the configurations described in [1] to [10] below.

[1] A pre-processing method by a pre-processing apparatus used before processing a sheet made of a metal and a rectangular elastic material into a cylindrical printing plate,
Bending one end of the elastic material sheet;
Bending the lower end of the elastic material sheet with a lower curvature than the one end of the elastic material sheet; and
A pre-processing method comprising:

[2] The portion excluding one end portion of the elastic material sheet and the other end portion of the elastic material sheet is subjected to bending with a curvature lower than the curvature of the one end portion of the elastic material sheet. The pre-processing method according to item 1 above.

[3] The pre-processing device includes a plate cylinder that is formed in a cylindrical shape and on which the elastic material sheet is wound around an outer peripheral surface,
The plate cylinder is continuous from the outer peripheral surface of the plate cylinder, a first curl portion formed of a curved surface located inside the outer peripheral surface of the plate cylinder, a second curl portion formed of an outer peripheral surface of the plate cylinder, Have
The elastic material sheet is wound around an outer peripheral surface of the plate cylinder, the one end portion is bent by the first curl portion, and the other end portion is bent by the second curl portion. The pre-processing method according to the preceding item 2.

[4] The pre-machining method according to item 3, wherein the radius of curvature of the first curled portion is set to be not less than 0.4 times and not more than 0.8 times the radius of curvature of the second curled portion.

[5] The plate cylinder includes a fixing portion having the first curl portion located on the inner side of the outer peripheral surface of the plate cylinder,
Item 3 or 4 above, wherein the elastic material sheet is wound around and attached to the plate cylinder while one end portion of the elastic material sheet is fixed by the fixing portion. The pre-processing method as described in.

[6] The pre-processing device includes a pressing portion that presses an outer peripheral surface of the elastic material sheet attached to the plate cylinder inward in a radial direction of the plate cylinder,
The pressing portion presses the outer peripheral surface of the elastic material sheet when the plate cylinder rotates while the elastic material sheet is wound around and attached to the outer peripheral surface of the plate cylinder. 6. The pre-processing method according to any one of 3 to 5 above.

[7] The pre-processing method according to the above item 6, wherein the pressing portion is configured to be able to advance and retreat in the radial direction of the plate cylinder according to the thickness of the elastic material sheet.

[8] The method according to any one of 1 to 7 above, wherein a bending process having a curvature higher than the curvature of the other end portion of the elastic material sheet is applied to a portion near the center of the one end portion of the elastic material sheet. Pre-processing method.

[9] The pre-processing method according to item 8 above, wherein the end portion side of the elastic material sheet is formed flatter than the central portion of the one end portion.

[10] A pre-processing apparatus used before processing a sheet made of a metal and rectangular elastic material into a cylindrical printing plate,
A first curl portion that bends one end of the elastic material sheet;
A second curl portion that bends the other end portion of the elastic material sheet with a curvature lower than the curvature of the one end portion of the elastic material sheet;
A pre-processing apparatus comprising:

According to the invention described in [1] above, a pre-processing method by a pre-processing apparatus used before processing a sheet made of a metal and a rectangular elastic material into a cylindrical printing plate, A step of bending one end portion of the elastic material sheet and a step of bending the other end portion of the elastic material sheet with a curvature lower than the curvature of the one end portion of the elastic material sheet. By bending the both ends of the elastic material sheet with the processing device and then forming it into a cylindrical shape, the possibility of defects such as cracks in the elastic material sheet is reduced, and cylindrical printing is performed with high accuracy. A printing plate can be formed.

Also, since one end and the other end of the elastic material sheet are bent with different curvatures, when the elastic material sheet is removed from the pre-processing apparatus and formed into a cylindrical shape after bending, the elastic material sheet Since the one end and the other end of the two are positioned so as to overlap each other in the radial direction in advance, it is possible to efficiently overlap the both ends without deteriorating workability due to contact between the two ends. Cylindrical molding is facilitated.

According to the invention described in [2] above, the portion excluding the one end portion of the elastic material sheet and the other end portion of the elastic material sheet is bent with a curvature lower than the curvature of the one end portion of the elastic material sheet. Therefore, by bending the elastic material sheet at a portion other than the one end portion and the other end portion of the elastic material sheet with a lower curvature than the curvature of the one end portion of the elastic material sheet, the entire elastic material sheet has a curvature. Since it is processed into a tinged shape, cylindrical molding is easier.

According to the invention described in [3] above, the pre-processing apparatus includes a plate cylinder that is formed in a cylindrical shape and on which an elastic material sheet is wound around the outer peripheral surface, and the plate cylinder is continuous from the outer peripheral surface of the plate cylinder. A first curled portion made of a curved surface located on the inner side of the outer peripheral surface of the plate cylinder, and a second curled portion made of the outer peripheral surface of the plate cylinder, and the elastic material sheet is disposed on the outer peripheral surface of the plate cylinder. Since one end is bent by the first curled portion and the other end is bent by the second curled portion, only the elastic material sheet is wound around the outer peripheral surface of the cylindrical plate cylinder, The first curl portion located on the inner side of the outer peripheral surface of the plate cylinder and the second curl portion formed of the outer peripheral surface of the plate cylinder can be bent at both ends of the elastic material sheet, respectively, and the elastic material One end of the sheet is tighter (higher curvature) than the other end It is possible to form the Le, easily machined elastic material-made sheet more easily into a cylindrical shape.

In addition, with such a configuration, both ends of the elastic material sheet are bent with different curvatures, and at the same time, the portions other than both ends of the elastic material sheet are looser than the one end of the elastic material sheet (the curvature is (Low) bending can be applied.

According to the invention described in [4] above, the radius of curvature of the first curled portion is set to be 0.4 to 0.8 times the radius of curvature of the second curled portion. When forming a cylindrical shape, if the difference in the radius of curvature between the first curl portion and the second curl portion is small, one end portion of the elastic material sheet comes into contact with the inner surface of the other end portion. However, since the first curl portion is set to a suitable radius of curvature with respect to the second curl portion, the one end portion side of the elastic material sheet is the other end side. Since one end portion formed by a tighter curl and bent by the first curl portion surely enters inside the other end portion bent by the second curl portion, both ends of the elastic material sheet are overlapped. Is more efficient and easier.

According to the invention described in [5] above, the plate cylinder includes the fixing portion having the first curl portion located on the inner side of the outer peripheral surface of the plate cylinder, and fixes one end portion of the elastic material sheet at the fixing portion. In such a state, the elastic material sheet is wound around the plate cylinder and attached to be processed, so that one end of the elastic material sheet is wound around the plate cylinder while being fixed to the fixed portion. It is possible to prevent the elastic material sheet from being displaced or dropped during processing.

According to the invention described in [6] above, the pre-processing apparatus includes a pressing portion that presses the outer peripheral surface of the elastic material sheet attached to the plate cylinder inward in the radial direction of the plate cylinder, When the plate cylinder rotates while the elastic material sheet is wound around and attached to the outer peripheral surface of the plate cylinder, the outer peripheral surface of the elastic material sheet is pressed, so that the elastic material sheet is made while being wound around the rotating plate cylinder. Since the sheet is pressed toward the inside in the radial direction of the plate cylinder by the pressing portion, the sheet made of an elastic material can be more reliably formed into a shape along the outer peripheral surface of the plate cylinder, and a highly accurate forming process is performed. be able to.

According to the invention described in [7] above, the pressing portion is configured to be able to advance and retract in the radial direction of the plate cylinder in accordance with the thickness of the elastic material sheet. When bending elastic material sheets with different thicknesses, the pressing part can be bent and moved back and forth in the radial direction of the plate cylinder according to the thickness of the elastic material sheet that differs depending on the position. In the step portion formed by the difference in thickness of the material sheet, it is possible to prevent an excessive load from being applied to the thick portion by the pressing portion, and there is no possibility that defects such as wrinkles occur.

According to the inventions described in the above [8] and [9], the elastic material sheet is formed into a cylindrical shape after bending because the bending portion having a high curvature is applied to the central portion of the one end portion of the elastic material sheet. When molding, both ends of the elastic material sheet can be more reliably prevented from coming into contact with each other, and the work of overlapping both ends can be performed more efficiently.

According to the invention described in [10] above, the apparatus is a pre-processing apparatus used before processing a metal and rectangular elastic material sheet into a cylindrical printing plate, the elastic material sheet A first curl portion that bends one end portion of the elastic material sheet, and a second curl portion that bends the other end portion of the elastic material sheet with a curvature lower than the curvature of the one end portion of the elastic material sheet. Since the elastic material sheet is formed into a cylindrical shape step by step, the possibility of defects such as cracks in the elastic material sheet is reduced, and a cylindrical printing plate can be formed with high accuracy.

Also, since one end and the other end of the elastic material sheet are processed so as to overlap each other in the radial direction by bending processes with different curvatures, the elastic material sheet is removed from the pre-processing apparatus after the bending process into a cylindrical shape. When molding, both ends are positioned so as to overlap in the radial direction in advance without reducing workability by contacting one end and the other end of the sheet made of elastic material with each other. Can be efficiently carried out, and cylindrical forming can be easily performed.

It is the schematic of the pre-processing apparatus which concerns on this invention. It is explanatory drawing for demonstrating the sheet | seat made from an elastic material processed with the pre-processing apparatus of this invention. It is explanatory drawing for demonstrating the plate cylinder with which the pre-processing apparatus of this invention was equipped. It is side surface sectional drawing of the pre-processing apparatus of this invention. It is a top view of the pre-processing apparatus of this invention. It is explanatory drawing for demonstrating the processing method of the sheet | seat made from an elastic material using the pre-processing apparatus of this invention. It is explanatory drawing for demonstrating the processing method of the sheet | seat made from an elastic material using the pre-processing apparatus of this invention. It is explanatory drawing for demonstrating the shape of the sheet | seat made from an elastic material processed with the pre-processing apparatus of this invention. It is a front view which shows an example of the cylindrical shaping | molding apparatus which carries out the 2nd process of the sheet | seat made from an elastic material after the process by the pre-processing apparatus of this invention. It is a top view which shows an example of the cylindrical shaping | molding apparatus which carries out the 2nd process of the sheet | seat made from an elastic material after the process by the pre-processing apparatus of this invention. It is explanatory drawing for demonstrating the 2nd process which processes the sheet | seat made from an elastic material after a process by the pre-processing apparatus of this invention. It is explanatory drawing for demonstrating the shape after the process of the sheet | seat made from the conventional elastic material.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram of the pre-processing apparatus 3, FIG. 2 is an explanatory diagram for explaining an elastic material sheet 21 processed by the pre-processing apparatus 3, and FIG. 3 is a plate provided in the pre-processing apparatus 3. FIG. 4 is a side sectional view of the pre-processing device 3, FIG. 5 is a plan view of the pre-processing device 3, and FIGS. 6A and 6B are elastic materials using the pre-processing device 3. FIG. 7 is an explanatory diagram for explaining the shape of the elastic material sheet 21 processed by the pre-processing device 3, and FIG. 8 is a diagram by the pre-processing device 3. FIG. 9 is a front view showing an example of a cylindrical forming device 4 that secondly processes the processed elastic material sheet 21, and FIG. 9 is a cylindrical shape that secondly processes the elastic material sheet 21 processed by the pre-processing device 3. FIG. 10 is a plan view showing an example of the device 4, and FIG. Explanatory view for explaining a second process of processing the elastic material-made sheet 21 after processing by, FIG. 11 is an explanatory diagram for explaining a conventional shape after machining of the elastic material-made sheet 21.

In the following description, the pre-processing apparatus 3 shown in FIG.

In describing the pre-processing device 3 used when the rectangular elastic material sheet 21 is formed into a cylindrical shape based on FIGS. 1 to 7, first, the elastic material sheet 21 processed by the pre-processing device 3 is used. Will be described.

The elastic material sheet 21 is formed in a rectangular shape before processing, and is formed into a cylindrical printing plate 2 by rounding it and joining both end portions 221 and 222.

The printing plate 2 is a printing plate 2 formed in a cylindrical shape, and is particularly used as a printing plate 2 having a small diameter.

The printed material to be printed is a beverage metal can, and in particular, a bottomed cylindrical beverage metal can formed by drawing and ironing (DI) molding a flat plate made of aluminum or an aluminum alloy is suitably printed.

The printing plate 2 includes a plate body 21 (hereinafter, also referred to as “elastic material sheet 21”) made of a metal elastic material sheet 21, and a plate portion formed on a part of the outer peripheral portion of the plate body 21. 23.

The plate portion 23 is used in the meaning including both after the printing pattern is engraved and before the printing pattern is engraved.

The plate body 21 is rounded into a cylindrical shape, and is formed into a printing plate 2 by joining the overlapped end portions 221 and 222.

The plate body 21 requires a high degree of processing, particularly when processed into the small-diameter printing plate 2, and if such processing is performed at once, there is a risk that defects such as wrinkles, cracks, and distortion may occur. For this reason, it is formed into a cylindrical printing plate 2 through two stages of processing, the first processing and the second processing.

As will be described in detail later, the plate main body 21 cut to a size necessary for forming the printing plate 2 is applied to a pre-processing apparatus 3 including a plate cylinder 1 that is formed in a cylindrical shape and around which the plate main body 21 is wound. As a result, the first processing is performed.

A cylindrical plate mounting surface 111 is formed on the outer periphery of the plate cylinder 1 of the pre-processing apparatus 3, and the plate body 21 is wound around and mounted on the plate mounting surface 111.

The plate portion 23 is provided at a predetermined location on the outer peripheral surface of the plate main body 21 and is formed on the outer surface portion of the plate main body 21 that is in close contact with the plate mounting surface 111 when the plate main body 21 is mounted on the plate cylinder 1.

The plate body 21 is made of a rectangular elastic material sheet 21 such as a magnetic or non-magnetic suitable metal. For example, a commercially available tin plate (Fe) is used, and the thickness of the plate body 21 is cylindrical. What is necessary is just to be able to form and to hold | maintain a cylindrical shape with an elastic force, and what is necessary is just to set suitably.

The plate main body 21 has a resin layer to be the plate portion 23 formed on one side thereof. For this resin layer, for example, a resin such as polyvinyl alcohol, vinyl ester, or polyamide can be used. For example, a hardness of about D20 to 80 after curing is preferable.

For example, if a UV curable resin (ultraviolet curable resin) is used for normal offset printing, it does not require complicated cleaning work with other solvents such as curable resin or high-pressure steam. It can be performed.

The resin layer only needs to have a thickness necessary for the printing plate portion 23. In this example, a layer having a thickness of about 0.4 mm to 0.6 mm is provided on one side of the plate body 21 having a thickness of about 0.26 mm. Is adhered.

The printing plate 2 formed in a cylindrical shape is mounted on the outer peripheral surface of the plate cylinder by being fitted from the front end side (operator side) of the cylindrical plate cylinder of a plate mounting device provided in a printing machine or the like. The

The plate mounting device includes, for example, a plate driving shaft and a plate cylinder attached to the plate driving shaft, and the plate cylinder is fitted from the front end side of the plate driving shaft provided in a printing machine or engraving machine. The plate is fixed to the outer peripheral surface of the plate drive shaft, and the printing plate 2 is mounted on the outer peripheral surface of the plate cylinder.

If the width 22 is too short, it is difficult to maintain the bonding strength of the joint 22 formed by joining the two ends 221 and 222 of the plate body 21. On the other hand, if the width is too long, the material cost increases. From the above, they are overlapped and joined with a width dimension at least sufficient to maintain the joining strength.

In addition, as a joining method of the joining part 22, joining by welding is the most preferable, but there is no particular limitation as long as an adhesion method in which both end parts 221 and 222 of the plate body 21 are not easily peeled off is adopted.

The plate body 21 is formed with a notch extending in the axial direction of the plate body 21 at one longitudinal end, specifically, an end on the rear end side when mounted on the outer peripheral surface of the plate cylinder 1. A positioning notch 24 is provided.

The positioning notch 24 is formed, for example, in the center of the plate body 21 in the longitudinal direction. When the plate body 21 is mounted on the cylinder member 41 or the like, the plate cylinder of the plate mounting apparatus or the cylinder of the cylindrical molding apparatus 4 described later is used. The plate main body 21 can be positioned in the circumferential direction and the axial direction by engaging with positioning protrusions provided on the member 41 and the like.

The plate body 21 is opposite to the longitudinal end portion (when the plate cylinder 1 is mounted, the rear end portion of the plate body 21) provided with the positioning cutout 24 (when the plate cylinder 1 is mounted, the front end side of the plate body 21). ) Is provided with a position indicating unit 25.

The position instruction section 25 is for making it easier to grasp the position of the positioning cutout section 24 so that the positioning cutout section 24 can be accurately engaged with a plate cylinder or the like. Is formed by removing the resin layer forming the plate portion 23 in the shape of an isosceles triangle, and the apex angle of the isosceles triangle is arranged toward the positioning notch 24 side.

In the first processing in this example, both the end portions 221 and 222 of the elastic material sheet 21 are wound by winding the elastic material sheet 21 around the plate cylinder 1 in addition to the both end portions 221 and 222 side of the elastic material sheet 21. The parts other than are also plastically deformed until a predetermined degree of processing is achieved.

For example, in the portion excluding the both end portions 221 and 222 side of the elastic material sheet 21, the diameter of the elastic material sheet 21 formed by the first processing is about 1 of the diameter of the elastic material sheet 21 formed into a cylindrical shape. .Plastic deformation until 2 times or more and about 3 times or less.

More specifically, when the inner diameter of the printing plate 2 after joining is 125.45 mm to 125.50 mm, the inner diameter of the elastic material sheet 21 in the first processing is the inner diameter of the printing plate 2 after joining. Processing is performed so that the radius is about 150 mm to 370 mm, which is about 1.2 to 3 times.

The predetermined degree of processing in the first processing is preferably in the range of about 1.2 to 2.8 times the inner diameter of the printing plate 2 (about 150 mm to 350 mm), more preferably the inner diameter of the printing plate 2. It may be set in a range of about 1.4 times to 2.5 times (about 180 mm to 310 mm).

In the first processing, the elastic material sheet 21 after being formed into a cylindrical shape is made of an elastic material until the diameter becomes about 1.2 to about 3 times the diameter of the elastic material sheet 21 formed in the first processing. Since the sheet 21 is plastically deformed, the elastic material sheet 21 is processed within a suitable range in the first processing, so that the second processing applied thereafter is easily performed.

In the first processing, the both ends 221 and 222 of the elastic material sheet 21 are bent so as to have different degrees of processing, that is, different curvatures.

When the ratio of the inner diameters of both ends 221 and 222 (large inner diameter / small inner diameter) is too low (close to 1), both ends 221 and 222 are natural. 11, one end 221 ′ of the elastic material sheet 21 comes into contact with the inside of the other end 222 ′, as can be seen from the processed shape of the conventional elastic material sheet 21 in FIG. 11. It becomes difficult to superimpose.

In addition, it is not preferable because an operation of overlapping both end portions 221 and 222 by an operator or the like is required at the time of joining work.

On the other hand, if the ratio of the degree of processing is too high, the degree of processing of only one end becomes too high, and there is a possibility that distortion may occur.

Therefore, as will be described in detail later, the one end portion 221 of the elastic material sheet 21 is bent with a predetermined curvature, and the other end portion 222 of the elastic material sheet 21 has a curvature lower than the curvature of the one end portion 221. Bending is performed.

In other words, the elastic material sheet 21 is bent at the one end 221 and the other end 222 with different curvatures.

The ratio of the degree of processing of both ends 221 and 222 (the degree of processing of one end 221 of the elastic material sheet 21 / the degree of processing of the other end 222 of the elastic material sheet 21) is in the range of about 1.1 to 2 times. Preferably, it is set to be in the range of about 1.3 times to 1.7 times.

In the first processing, since the processing degree is set to be different between the one end portion 221 side and the other end portion 222 side of the elastic material sheet 21, the end portion on the side having the large processing degree (small inner diameter) has the processing degree. Since it becomes the shape which penetrates into the inside of the edge part of a small (large internal diameter) side and overlaps, it becomes easy to perform the joining process at the time of shape | molding the sheet | seat 21 made from an elastic material into a cylinder shape after that.

In the second processing performed after the first processing is performed, the elastic material sheet 21 is made into a complete cylindrical shape, and the overlapped end portions are joined together to form a joined portion 22, thereby forming a cylindrical shape. Molded into a printing plate 2.

The pre-processing apparatus 3 used for the first processing includes, for example, a base 31, a shaft 100 as a rotation shaft extending in the front-rear direction at the approximate center of the base 31, and a plate fixedly attached to the outer peripheral surface of the shaft 100. And a torso 1.

A pressing portion 34 that presses the elastic material sheet 21 wound around the plate cylinder 1 inward in the radial direction of the plate cylinder 1 is disposed on the right hand side of the plate cylinder 1. A plate supply unit 35 for supplying the elastic material sheet 21 to 1 is disposed.

The plate cylinder 1 includes a plate cylinder main body 11 formed in a cylindrical shape, and an insertion hole 12 through which the shaft 100 is inserted is provided at the center of the plate cylinder main body 11.

The plate mounting surface 111 formed on the outer periphery of the plate cylinder body 11 is formed concentrically with the shaft 100.

The diameter of the plate cylinder 1 is preferably set to about 95 mm to 150 mm, more preferably about 97 mm to 125 mm, and most preferably about 98 mm to 110 mm.

An operation unit 33 fixedly attached is provided on the distal end side of the shaft 100. The operation unit 33 is provided with, for example, a rotary handle as the operation unit main body 331, and the operation unit main body 331 includes a grip. A portion 332 is provided.

The operation unit 33 is configured such that the shaft 100 and the plate cylinder 1 rotate in conjunction with its own rotation.

Between the plate cylinder 1 and the operation unit 33, for example, a shaft support portion 32 is provided which is horizontally mounted on two support columns 321 on the base 31, and the shaft support portion 32 is operated from the plate cylinder 1. The shaft 100 extending to the portion 33 is supported.

The length in the axial direction of the plate cylinder 1 is set to a dimension longer than the length in the short direction of the elastic material sheet 21 or the dimension equivalent to the length in the short direction of the elastic material sheet 21.

The plate supply unit 35 is a device for supplying the elastic material sheet 21 to the plate cylinder 1. The plate supply unit 35 is disposed at a position outside the roll 352, a roll frame 352 to which the roll 351 is attached. , And a frame support portion 354 that supports the roll frame 352.

The receiving roll 351 has a roll that is rotatable at both ends supported by the roll frame 352, and supplies the elastic material sheet 21 to the plate cylinder 1 by the rotating operation of the roll.

A long hole 355 extending in the vertical direction is formed in the frame support portion 354, and a hole 353 extending in the longitudinal direction is formed in each roll frame 352, and the long hole 355 of each frame support portion 354 is formed. The connecting member 356 is fitted, and the connecting member 356 is fitted into the hole 353 of the roll frame 352 to connect the frame support portion 354 and the receiving roll 351 and fix the connecting member 356 at an appropriate position. The position of the receiving roll 351 can be adjusted.

The plate cylinder 1 is provided with lid portions 15 that respectively cover the front surface and the rear surface of the plate cylinder 1, and each lid portion 15 is provided with an engagement portion 16 formed in a square shape so as to protrude. Yes.

The engaging portion 16 is provided on the upper side of the lid portion 15. Specifically, in this example, the upper surface of the engaging portion 16 and the upper surface of the flat portion 131 are arranged so as to be a flat surface having almost no step. Yes.

An engagement hole 161 into which a member such as a screw is inserted is formed on the upper surface of the engagement portion 16. *

The plate cylinder 1 has a mounting portion 13 and a pressing portion 14 that function as fixing portions 13 and 14 for fixing one end portion 221 of the elastic material sheet 21 in a part thereof.

As shown in FIG. 6A, an elastic material sheet 21 is placed on the placement portion 13, and the upper surface of the elastic material sheet 21 placed on the placement portion 13 is covered with the pressing portion 14 to hold down. Removably attached to.

In this example, the placing portion 13 and the holding portion 14 are provided on the upper portion of the plate cylinder 1, and the upper and lower surfaces of the elastic material sheet 21 are sandwiched between the placing portion 13 and the holding portion 14. The elastic material sheet 21 is fixed to the plate cylinder 1.

At this time, the one end 221 of the elastic material sheet 21 is fixed at a position inside the plate mounting surface 111 of the plate cylinder 1.

The placing portion 13 includes a flat portion 131 on which the elastic material sheet 21 is placed, an abutting portion 134 with which the one end 221 of the elastic material sheet 21 abuts, and a convex portion 133 that forms the abutting portion 134. Have.

The flat portion 131 is formed by a flat surface from which a part of the cylindrical portion of the plate cylinder 1 is removed, and continues to the plate mounting surface 111 which is the outer peripheral surface of the plate cylinder 1.

The length dimension of the flat portion 131 (the length in the direction perpendicular to the axial direction of the plate cylinder 1) is preferably set in the range of about 10 mm to 25 mm, and more preferably about 15 mm to 25 mm.

The flat portion 131 extends long in the axial direction of the plate cylinder 1 and is set to a length dimension equivalent to the axial dimension of the plate cylinder 1.

The flat portion 131 is located on the radially inner side with respect to the cylindrical surface including the plate mounting surface 111, and a curved portion 132 is formed at a portion continuous from the flat portion 131 to the outer peripheral surface of the plate cylinder 1.

The curved portion 132 is set to have a higher curvature than the curvature of the plate mounting surface 111 of the plate cylinder 1.

When the elastic material sheet 21 is wound around the outer peripheral surface of the plate cylinder 1, the elastic material sheet 21 has one end portion 221 placed on the flat portion 131, and is further wound along the curve of the bending portion 132 to mount the plate. A plane 111 is reached.

With such a configuration, the bending portion 132 can be bent at the one end portion 221 side of the elastic material sheet 21 with the curvature of the continuous portion from the flat portion 131 to the outer peripheral surface of the plate cylinder 1.

As will be described later, the other end 222 of the elastic material sheet 21 is subjected to bending corresponding to the curvature of the outer peripheral surface of the plate cylinder 1 (plate mounting surface 111).

That is, the curved portion 132 functions as the first curled portion 132, and the outer peripheral surface ( plate mounting surfaces 141, 111 described later) of the plate cylinder 1 functions as the second curled portions 141, 111.

The curvature radius r of the curved portion 132 (first curl portion 132) is compared with the radius (curvature radius) R of the outer peripheral surface (second curl portion 141, 111) of the plate cylinder 1 (the curvature radius of the first curl portion 132). r / the radius of curvature R of the second curled portion 141) is preferably set in the range of about 0.4 times to 0.8 times, preferably about 0.5 times to 0.7 times, and more preferably about 0. More preferably, it is set to .55 times to 0.65 times.

When the radius of curvature r of the first curled portion 132 is set to be 0.4 to 0.8 times the radius of curvature R of the second curled portions 141 and 111, the elastic material sheet 21 is formed into a cylindrical shape. At this time, if the difference in the radius of curvature between the first curl portion 132 and the second curl portions 141 and 111 is small, the one end portion 221 of the elastic material sheet 21 comes into contact with the inner surface of the other end portion 222 and the elastic material. It is difficult to superimpose both ends 221 and 222 of the sheet 21 in the radial direction.

However, in the present invention, since the first curl portion 132 is set to have a suitable radius of curvature with respect to the second curl portions 141 and 111, the one end portion 221 side of the elastic material sheet 21 is more than the other end portion 222 side. Since one end 221 formed by a tight (high curvature) curl and bent by the first curl portion 132 surely enters the inside of the other end 222 bent by the second curl portion 141, it is made of an elastic material. The overlapping of both end portions 221 and 222 of the sheet 21 becomes more efficient and easy.

When the plate cylinder 1 is viewed from the front, as shown in FIG. 3B, the flat portion 131 is formed with a wall surface that rises perpendicularly to the flat portion 131. A step portion (convex portion 133) having a height substantially corresponding to the intermediate height position is formed.

The convex portion 133 is formed in, for example, a rectangular shape that is long in the axial direction of the plate cylinder 1, and is fixedly attached to the upper end portion of the flat portion 131 in contact with a wall surface perpendicular to the flat portion 131.

The convex portion 133 is provided with an equal length between both end portions in the axial direction of the plate cylinder 1 and is fixedly attached to the flat portion 131 via a screwing member such as a screw.

The contact portion 134 is a surface that rises vertically from the flat portion 131 having the convex portion 133.

The abutting portion 134 is configured such that one end portion 221 of the elastic material sheet 21 placed on the flat portion 131 abuts when the elastic material sheet 21 is bent.

Accordingly, when the elastic material sheet 21 is mounted on the plate cylinder 1, the elastic material sheet 21 to be placed can be positioned by bringing the one end portion 221 of the elastic material sheet 21 into contact with the contact portion 134. .

As described above, the pressing portion 14 is attached to the upper portion of the plate cylinder main body 11 so as to cover the upper portion of the flat portion 131 formed by cutting out a part of the cylindrical surface of the plate cylinder 1.

The holding portion 14 is attached to the upper portion of the plate cylinder main body 11, and the outer peripheral surface thereof has an arc having the same curvature as the outer peripheral surface of the plate cylinder main body 11 (plate mounting surface 111), and the plate mounting surface 111 It is formed so as to be a continuous surface, and functions as a plate mounting surface 141 like the plate cylinder body 11.

A concave portion 143 is formed in the lower portion (rear surface) of the holding portion 14 so as to be fitted to the convex portion 133 of the plate cylinder main body 11. An upper hole 142 is formed in the upper portion of the holding portion 14, such as a bolt. The joining member 144 is screwed into the upper hole 142 and is fixedly attached to the plate cylinder 1.

The holding part 14 is attached to the plate cylinder main body 11 and is equal to the thickness of the elastic material sheet 21 between the flat part 131 of the mounting part 13 or more than the thickness of the elastic material sheet 21. A slightly thin gap is formed.

The holding portion 14 is set to be longer than the axial length of the plate cylinder 1, and when the holding portion 14 is attached to the upper portion of the plate cylinder 1, the front surface of the plate cylinder 1 before and after the plate cylinder 1 in the axial direction. And it is provided so that it may protrude in the front direction and the back direction from the cover part 15 provided in the rear surface, respectively.

The holding portion 14 has a length dimension in which the front and rear end portions protrude forward and rearward from the lid portion 15, and an upper hole 142 is formed above the portion protruding from the lid portion 15. Is formed.

The holding part 14 is fixed by engaging an engaging member 144 such as a bolt into the upper hole 142 and screwing into an engaging hole 161 of the engaging part 16 provided at the front upper part of each lid part 15. Attached.

Since the length dimension of the elastic material sheet 21 in the short direction is set to be shorter than the length in the axial direction of the plate cylinder 1, the position where the holding part 14 protrudes outward in the axial direction of the plate cylinder 1. By fixing with, it can be surely fixed without damaging the elastic material sheet 21 or the like.

The remaining portion of the elastic material sheet 21 is wound around the plate cylinder 1 in a state where the one end 221 of the elastic material sheet 21 is fixed to the fixing portions 13 and 14 (the placement portion 13 and the holding portion 14). As a result, the one end portion 221 and the other end portion 222 of the elastic material sheet 21 are bent with different curvatures.

In addition, by winding the elastic material sheet 21 around the plate cylinder 1, curvatures (elasticity) substantially equal to those of the outer peripheral surfaces 111 and 141 of the plate cylinder 1 are also applied to portions other than both end portions 221 and 222 of the elastic material sheet 21. Bending is performed with a curvature equal to that of the other end portion 222 of the material sheet 21.

In the pre-processing apparatus 3, the plate mounting surface 111 of the plate cylinder 1 functions as the second curl portions 111 and 141 in addition to the plate mounting surface 141 of the holding portion 14.

As described above, the pre-processing apparatus 3 includes the plate cylinder 1 that is formed in a cylindrical shape and on which the elastic material sheet 21 is wound around the outer peripheral surface (the plate mounting surfaces 111 and 141). A first curl portion 132 formed of a curved surface that is continuous from the outer peripheral surfaces 111 and 141 and is located inside the outer peripheral surfaces 111 and 141 of the plate cylinder 1 and a second curl portion 141 that includes the outer peripheral surfaces 111 and 141 of the plate cylinder 1. The elastic material sheet 21 is wound around the outer peripheral surfaces 111 and 141 of the plate cylinder 1, the one end part 221 is bent by the first curl part 132, and the other end part by the second curl part 141. Since 222 is bent, the first curl positioned on the inner side of the outer peripheral surfaces 111 and 141 of the plate cylinder 1 simply by winding the elastic material sheet 21 around the outer peripheral surfaces 111 and 141 of the cylindrical plate cylinder 1. Part 132 and plate The second curled portion 141 consisting of one of the outer circumferential surface 111,141 is, may be subjected to each bent at both ends 221 and 222 of the elastic material-made sheet 21.

In addition, since one end 221 of the elastic material sheet 21 can be curled (having a higher curvature) than the other end 222, the elastic material sheet 21 can be easily processed into a cylindrical shape.

In addition, with such a configuration, the both ends 221 and 222 of the elastic material sheet 21 are bent with different curvatures, and at the same time, the elastic material sheet 21 is also applied to portions other than the both ends 221 and 222 of the elastic material sheet 21. 21 can be bent (having a lower curvature) than the one end portion 221.

Since the portion excluding the one end 221 of the elastic material sheet 21 and the other end 222 of the elastic material sheet 21 is subjected to bending with a curvature lower than the curvature of the one end 221 of the elastic material sheet 21, the elastic material The entire portion of the elastic material sheet 21 is also curved by bending the lower part of the elastic material sheet 21 than the curvature of the one end part 221 of the elastic material sheet 21 at a portion other than the one end part 221 and the other end part 222. Since it is processed into a tinged shape, cylindrical molding is easier.

In addition, the plate cylinder 1 has a fixed portion (a mounting portion 13 and a holding portion) having a first curl portion 132 (curved portion 132) located inside the outer peripheral surface (plate mounting surfaces 111 and 141) of the plate cylinder 1. 14), and the elastic material sheet 21 is wound around and mounted on the plate cylinder 1 in a state where the one end 221 of the elastic material sheet 21 is fixed by the fixing part (the mounting part 13 and the holding part 14). Therefore, since one end portion 221 of the elastic material sheet 21 is wound around the plate cylinder 1 in a state of being fixed to the fixing portion (the placement portion 13 and the retaining portion 14), the elasticity during the processing is obtained. It is possible to prevent the material sheet 21 from shifting or dropping off.

The pressing part 34 includes a pressing roll 341 that is a long roll in the axial direction of the plate cylinder 1, a roll bearing 342 that rotatably supports both ends of the pressing roll 341, a bearing support part 343 that supports the roll bearing 342, Is provided.

The pressing unit 34 is disposed at a position facing the plate supply unit 35 across the plate cylinder 1, and is provided so that the axial direction of each pressing roll 341 is parallel to the axial direction of the plate cylinder 1.

The pressing roll 341 is rotatably supported by the roll bearing 342, and a part of the outer peripheral surface thereof abuts on the elastic material sheet 21 mounted on the outer peripheral surface of the plate cylinder 1, and faces the inner side in the radial direction of the plate cylinder 1. By being pressed, the elastic material sheet 21 to be the printing plate 2 is bent as the first processing.

The roll bearing 342 is fixedly attached to the support column 321 via the bearing support portion 343.

In this example, a plurality of pressing portions 34 are provided, and are provided at three locations, an upper position, an intermediate position, and a lower position of the plate cylinder 1.

Since a plurality of portions of the elastic material sheet 21 are pressed by the pressing portion 34 and bent, the elastic material sheet 21 supplied from the plate supply portion 35 and wound around the plate cylinder 1 is attached to the outer periphery of the plate cylinder 1. It is possible to obtain the elastic material sheet 21 which can be wound while being in close contact with the surface, and which has been subjected to bending with the expected curvature.

The pre-processing device 3 includes a pressing portion 34 that presses the outer peripheral surface (plate mounting surface 111) of the elastic material sheet 21 mounted on the plate cylinder 1 toward the inside in the radial direction of the plate cylinder 1. When the plate cylinder 1 rotates with the elastic material sheet 21 wound around and mounted on the outer peripheral surface (plate mounting surface 111) of the plate cylinder 1, the outer peripheral surface (plate mounting surface 111) of the elastic material sheet 21 is rotated. Since the elastic material sheet 21 is pressed toward the inner side in the radial direction of the plate cylinder 1 by the pressing portion 34 while being wound around the rotating plate cylinder 1, the elastic material sheet 21 is more reliably attached to the plate cylinder. 1 can be formed into a shape along the outer peripheral surface (plate mounting surface 111), and a highly accurate forming process can be performed.

In the elastic material sheet 21 in this example, since the thickness is different between the location where the plate portion 23 formed on the outer periphery of the elastic material sheet 21 is provided and the location where it is not provided, the pressing portion 34 is It is preferable that the plate cylinder 1 is configured to be movable inward and outward in the radial direction.

In this example, a retractable spring 344 is provided on the side of the roll bearing 342 opposite to the side where the pressing roll 341 contacts the elastic material sheet 21, and the pressing roll 341 can advance and retract in the radial direction of the plate cylinder 1. Configured.

Specifically, when the plate cylinder 1 is rotated, the elastic material sheet 21 is gradually wound around the plate cylinder 1, and the pressing roll 341 that is in contact with the elastic material sheet 21 is provided with the plate portion 23. When applied to the location, the surface of the pressing roll 341 that is pressed to the outer side in the radial direction of the plate cylinder 1 by the thickness of the plate portion 23 moves to the outer side in the radial direction of the plate cylinder 1. .

In this state, when the plate cylinder 1 continues to rotate and the contact portion of the pressing roll 341 reaches a portion where the plate portion 23 is not formed, the plate cylinder is as much as the thickness of the plate portion 23 lost by the elastic force of the spring 344. 1, the surface of the pressing roll 341 that is in contact with the elastic material sheet 21 moves inward in the radial direction of the plate cylinder 1.

Since the pressing portion 34 is configured to be able to advance and retreat in the radial direction of the plate cylinder 1 according to the thickness of the elastic material sheet 21, the pressing portion 34 has an image pattern or the like so that the elastic material sheet 21 having a partially different thickness is provided. When the bending process is performed, the pressing portion 34 can be bent while moving back and forth in the radial direction of the plate cylinder 1 according to the thickness of the elastic material sheet 21 that varies depending on the position. In the step portion formed by the difference in thickness, it is possible to prevent an excessive load from being applied to the thick portion by the pressing portion 34, and there is no possibility that defects such as wrinkles occur.

The elastic material sheet 21 rounded by the first processing is finally formed into the cylindrical printing plate 2 by using a cylindrical molding device for performing the second processing. .

The inner diameter of the printing plate 2 is processed by the second processing so as to have a dimension substantially equal to the outer diameter of the plate cylinder provided in the plate mounting device.

The cylindrical molding device 4 includes a cylindrical cylinder member 41. For example, the cylindrical member 41 is wound around the cylinder member 41 by bending the sheet 21 made of an elastic material having different curvatures at both ends 221 and 222 in the first processing. The elastic material sheet 21 wound around 41 is pressed and fixed to the cylinder member 41, and after the elastic material sheet 21 is processed into a cylindrical shape, both ends 221 and 222 thereof are joined.

As the cylindrical molding device 4, it is only necessary that the cylindrical printing plate 2 having a desired curvature can be molded by the second processing after the first processing is performed. 4 or the like can be used as appropriate.

As shown in FIGS. 8 and 9, as an example, in the second process, the cylinder member 41, the lower support portion 42 that presses the elastic material sheet 21 from below and fixes the cylinder member 41 to the cylinder member 41, and the shaft of the cylinder member 41. It is set to a length dimension substantially equal to the length in the direction, and can be moved in the contact / separation direction with respect to the outer peripheral surface of the cylinder member 41 and the roller portions 43 provided on the left and right sides of the cylinder member 41 respectively. In the state where the shaft body 44 and the both end portions 221 and 222 of the elastic material sheet are overlapped, the pressing portion 45 that presses the both end portions 221 and 222 overlapped from the outside in the radial direction of the cylinder member 41 and the welding rod are accommodated. The spread of the elastic material sheet 21 wound around the cylinder member 41 due to the spring back (repulsive force) and the joining machine 46 having a welding gun or the like is suppressed. A stopper portion 47, the positioning notches 24 of the elastic material-made sheet 21 and the positioning protrusion to be engaged, the cylindrical forming device 4 having a used.

The cylinder member 41 has the outer diameter of the cylinder member 41 substantially equal to the inner diameter of the printing plate 2 after molding in order to obtain the printing plate 2 having an expected inner diameter by winding the elastic material sheet 21 around the outer peripheral surface thereof. The dimensions are set.

The cylinder member 41 is formed with a positioning projection (not shown) on the lower side in FIG. 8 with which the positioning notch 24 formed on the elastic material sheet 21 is engaged.

The lower support portion 42 moves up and down so as to be able to contact and separate from the outer peripheral surface of the cylinder member 41, and the upper surface 421 thereof is formed to have the same curvature as that of the outer peripheral surface of the cylinder member 41. It is configured to touch.

Thus, even when the elastic material sheet wound around the outer periphery of the cylinder member 41 is pressed, deformation of the elastic material sheet does not occur.

The shaft body 44 is provided with a movable portion at the base end portion thereof, and is configured to move in the contact / separation direction with respect to the outer peripheral surface of the cylinder member 41.

A telescopic portion 441 that is extendable and retractable is provided on the distal end side of the shaft body 44, and is configured to move along the outer peripheral surface of the cylinder member 41 as indicated by a broken line in FIG.

The roller portion 43 is loosely fitted into a curved hole 431 formed in a frame or the like at the end thereof, and is attached to the outer peripheral surface of the elastic material sheet 21 attached to the cylinder member 41 as the expansion and contraction portion 441 expands and contracts. It is configured to move within the range of the curved hole 431 while abutting.

The roller portion 43 moves in the range of the curved hole 431 along the outer peripheral surface of the cylinder member 41 from the lower side to the upper side of the cylinder member 41 around which the elastic material sheet 21 is wound, except for the uppermost portion of the cylinder member 41. The elastic material sheet 21 is pressed and processed.

When attaching the elastic material sheet 21 to the cylinder member 41 and removing the molded printing plate 2 from the cylinder member 41, in order to form a gap between the roller portion 43 and the outer peripheral surface of the cylinder portion, The roller unit 43 is moved to the lowest position of the curved hole 431.

The pressing portion 45 is formed, for example, in an L-shaped cross section, and the lower surface thereof serves as a pressing surface that presses both end portions 221 and 222 of the overlapped elastic material sheet 21 from the outside in the radial direction of the cylinder member 41. .

For example, a plurality of elliptical through holes 451 are formed on the pressing surface in an aligned state.

The joining machine 46 is configured to be movable in the axial direction of the cylinder member 41 above the elastic material sheet 21.

The joining machine 46 is made of an elastic material by spot welding or the like through a through hole 451 on the pressing surface in a state where both ends 221 and 222 on which the elastic material sheets 21 are overlapped are pressed and temporarily fixed by the pressing portion 45. The both ends 221 and 222 of the manufactured sheet are joined and fixed.

By being configured in this way, it is easy to perform the joining operation without causing the end portions 221 and 222 of the elastic material sheet to shift.

The stopper portion 47 is, for example, a plate-like member that extends along the axial direction of the cylinder member 41, and is disposed on each side of the cylinder member 41 in the axial direction.

The stopper portion 47 is provided at a position slightly below the uppermost end of the cylinder member 41, for example, and configured to be able to contact and separate in the horizontal direction with respect to the outer peripheral surface of the cylinder member 41.

Hereinafter, a method for forming the elastic material sheet 21 into the cylindrical printing plate 2 using the pre-processing apparatus 3 and the cylindrical forming apparatus 4 described above will be described.

First, based on FIG. 6A, FIG. 6B, and FIG. 7, the method to perform the 1st process to the sheet | seat 21 made from an elastic material using the pre-processing apparatus 3 is demonstrated.

In this example, a plate cylinder 1 having a diameter of about 100 mm is used as the plate cylinder 1 provided in the pre-processing apparatus 3.

A positioning notch 24 is formed at one end in the longitudinal direction of a rectangular elastic material sheet 21 having a resin layer to be the plate 23 formed on one side.

In this example, the elastic material sheet 21 (plate body 21) has a size of about 187.9 mm × about 418 mm, and the plate portion 23 is left and right with respect to the longitudinal center position of the elastic material sheet 21. It is provided asymmetrically.

The illustrated elastic material sheet 21 is provided so that the plate portion 23 is asymmetrical with respect to the center position in the longitudinal direction of the plate body 21, but this is only for explaining the configuration of the present invention. It is only an example and does not limit the present invention.

Specifically, the plate portion 23 on the one end portion 221 side is provided with a length of about 88 mm from the longitudinal center position of the elastic material sheet 21, and the plate portion 23 on the other end portion 222 side is made of an elastic material. The sheet 21 is provided with a length of about 121 mm from the longitudinal center position.

The other end portion 222 side of the elastic material sheet 21 is formed with a plate portion 23 having a length in the longitudinal direction so that the other end portion 222 does not cover the plate portion 23 on the one end portion 221 side when being formed into a cylindrical shape. Therefore, when wound around the plate cylinder 1 in a state of being fixed to the fixing portions 13 and 14 (the mounting portion 13 and the holding portion 14) of the plate cylinder 1, the other end portion 222 of the elastic material sheet 21 is wound. Is surely overlapped with a portion where the plate portion 23 on the one end 221 side is absent.

The positioning notch 24 is placed on a jig or the like and positioned and fixed, and the positioning notch 24 of the predetermined elastic material sheet 21 is formed (in this example, the abbreviation of the elastic material sheet 21). It is formed by pressing a punch against the center part and hitting it with a hammer.

At the end of the elastic material sheet 21 in the longitudinal direction, a position indicating portion 25 is formed at a position facing the positioning notch 24.

The position indicating portion 25 is formed by removing the resin layer that becomes the plate portion 23 in an isosceles triangle shape at a substantially central portion of the longitudinal end portion of the elastic material sheet 21.

The elastic material sheet 21 on which the positioning notch 24 and the position indicating portion 25 are formed is supplied to the pre-processing device 3 and subjected to the first processing, whereby the curvatures of both end portions 221 and 222 are different, and It is molded into a slightly curved shape as a whole.

The elastic material sheet 21 is supplied from the plate supply unit 35 to the plate cylinder 1 with the resin layer serving as the plate unit 23 facing upward, and one end portion 221 of the plate 21 contacts the mounting unit 13 of the plate cylinder body 11. When it comes into contact with the portion 134, the supply of the elastic material sheet 21 is temporarily stopped.

At this time, a sufficient space is provided between the placing portion 13 and the holding portion 14 provided on the upper portion of the plate cylinder 1 so that the elastic material sheet 21 can be inserted, or the holding portion. 14 is removed from the plate cylinder main body 11.

The elastic material sheet 21 has its one end 221 in contact with the contact portion 134, and the holding portion 14 and the engagement portion 16 are engaged with each other via the engagement member 144. The one end 221 side is fixed to the plate cylinder 1 by being clamped by the holding portion 14.

In a state where the one end 221 side of the elastic material sheet 21 is fixed to the plate cylinder 1, the elastic material sheet 21 indicated by the arrow in the figure is wound around the plate cylinder 1 (in FIGS. 6B (a) to (c), The plate cylinder 1 rotates in the clockwise direction toward the paper surface, and the elastic material sheet 21 is wound around the outer peripheral surface of the plate cylinder 1 and attached.

Since the placing portion 13 and the holding portion 14 fix the elastic material sheet 21 at a position inside the outer peripheral surface (the plate mounting surface 111) of the plate cylinder 1, the one end portion 221 of the elastic material sheet 21 includes Bending with a higher working degree than that of the other end 222 side wound around the outer peripheral surface of the plate cylinder 1 is performed.

In this example, the radius of curvature of the first curled portion 132 (curved portion 132) for bending the one end portion 221 of the elastic material sheet 21 is set to 30 mm, and the second curled portion for bending the other end portion 222 is set. The radii of curvature of 111, 141 (plate mounting surfaces 111, 141) are set to 50 mm (radius of the plate cylinder 1).

As shown in the drawing, the first curl portion 132 is not bent near the end portion of the one end portion 221 of the elastic material sheet 21 (it remains flat) and is closer to the center than the end portion on the one end portion 221 side ( Bending is performed on the portion near the other end 222) to form an inward curl having a higher curvature than the other end 222 side bent by the second curl 111, 141 equal to the curvature of the plate cylinder 1 It is configured to

Further, the second curl portions 111 and 141 bend the other end portion 222 of the elastic material sheet 21, but as shown in the drawing, the vicinity of the end portion of the other end portion 222 subjected to the bend is Due to the spring back (repulsive force) generated at the end portion of the end portion 222, it slightly returns to the original position and is separated from the outer peripheral surface of the plate cylinder 1.

When the first curl portion 132 is provided so that a curl is formed at a portion near the center (near the other end portion 222) excluding the vicinity of the end portion on the one end portion 221 side, the elastic material removed from the plate cylinder 1 is provided. It is preferable because both ends 221 and 222 of the sheet 21 do not come into contact with each other and it is easy to stack the both ends 221 and 222 in the subsequent joining step, or it is easy to press the stacked ends 221 and 222. Alternatively, the bending may be performed only in the vicinity.

The bending on the other end 222 side is preferably configured to bend the entire end on the other end 222 side, but is not limited to this, and the other end 222 side is not limited thereto. It may be configured to bend a portion closer to the center (near the one end 221) excluding the vicinity of the end.

From the outside of the elastic material sheet 21 wound around the plate cylinder 1 at the positions where the pressing portions 34 provided at the upper, middle, and lower three positions on the outer right half of the plate cylinder 1 are dispersed. The plate cylinder 1 is pressed toward the inside in the radial direction.

Since the plate cylinder 1 has a structure in which the holding portion 14 is attached to the upper portion of the plate cylinder main body 11, the plate cylinder 1 is made of an elastic material due to a slight step generated at the joint between the plate cylinder main body 11 and the holding portion 14. In order to avoid a possibility that a bending failure of the sheet 21 may occur, the pressing portion 34 provided on the upper side of the plate cylinder 1 is disposed at a position not covering the seam.

When the elastic material sheet 21 is wound around the plate cylinder 1, the pressing portion 34 abuts on a portion having a step between the portion where the plate portion 23 is provided and the portion where the plate portion 23 is not provided. Since the abutting position of the pressing roll 341 is automatically moved in accordance with the level difference, the bending process due to the level difference of the elastic material sheet 21 does not occur.

The elastic material sheet 21 is set in such a manner that the one end 221 and the other end 222 are maximum and the overlap is allowed in an angle range of an angle O = about 95 ° in the state where the sheet cylinder 1 has been wound. (See FIG. 7).

When the first processing is performed in this manner, the elastic material sheet 21 is bent at both ends 221 and 222 with different curvatures, and is plastically deformed into a generally rounded substantially cylindrical shape as a whole.

Subsequently, the elastic material sheet 21 formed in a substantially cylindrical shape in the first processing is inserted from the distal end side of the cylinder member 41 of the cylindrical forming device 4 and attached to the outer periphery of the cylinder member 41, so that the second Processing is applied.

Hereinafter, a method of performing the second processing using the cylindrical forming device 4 on the elastic material sheet 21 subjected to the first processing will be described with reference to FIGS.

The diameter of the elastic material sheet 21 after the first processing is set to be about 1.2 times to about 3 times the inner diameter of the printing plate 2 after being formed into a cylindrical shape. The diameter of the plate cylinder 1 of the pre-processing device 3 (about 100 mm) is smaller than the diameter of the cylinder member 41 of the cylindrical forming device 4 (about 125.5 mm). Yes.

Since the one end 221 side of the elastic material sheet 21 is processed at a higher workability than the other end 222 side, the other end of the one end 221 processed at a high workability is processed at a low workability. It is easy to overlap and enter the lower side of 222, and to be easily attached to the cylinder member 41.

The elastic material sheet 21 is fitted to the positioning protrusion of the cylinder member 41 while the position of the positioning notch 24 is confirmed based on the position indicating portion 25, so that the positioning notch 24 is fitted to the positioning protrusion of the cylinder member 41. Mounted in a positioned state.

Below the cylinder member 41, when the elastic material sheet 21 is positioned on the cylinder member 41, the lower support portion 42 is raised and brought into contact with the elastic material sheet 21 to be pressed against the cylinder member 41. The elastic material sheet 21 is fixed.

The elastic material sheet 21 is fixed so as to be pressed from below the cylinder member 41 without being displaced in the circumferential direction because the positioning notch 24 is engaged with the positioning protrusion. Therefore, it does not shift in the axial direction.

At this time, both end portions 221 and 222 of the elastic material sheet 21 are unjoined free ends.

The elastic material sheet 21 is formed into a cylindrical shape by the roller portions 43 waiting on the left and right sides below the cylinder member 41 rising and moving along the outer periphery of the cylinder member 41.

For example, the roller portion 43 is in contact with the elastic material sheet 21 wound around the outer periphery of the cylinder member 41 and extends from the lower side of the cylinder member 41 to the front side where the stopper portion 47 is provided. Then, the elastic material sheet 21 is gradually moved upward and the second process is performed on the elastic material sheet 21, and the shape of the elastic material sheet 21 approaches a cylindrical shape.

In order to suppress the spring back (repulsive force) that the elastic material sheet tries to return to the original shape when the roller part 43 is raised to the front of the stopper part 47, the stopper part 47 provided in the cylindrical molding apparatus is used as a cylinder member. The vicinity of the end portions 221 and 222 of the elastic material sheet 21 is fixed so as to be close to 41 and pressed against the outer peripheral surface of the cylinder member 41.

In this state, the pressing portion 45 located at the upper part of the cylinder member 41 is lowered, and the both ends 221 and 222 where the elastic material sheet 21 is overlapped are pressed in a temporarily fixed state, and are made of an elastic material. A joining step for joining both end portions 221 and 222 of the sheet 21 is performed.

The gun of the joining machine 46 moves in the axial direction of the cylinder member 41 above the elastic material sheet 21 and performs spot welding through the through-holes 451 of the pressing part 45, so that both end portions of the elastic material sheet 21 are moved. 221 and 222 are joined.

Thus, the printing plate 2 formed into a cylindrical shape is obtained through the first processing and the second processing.

As described above, the elastic material sheet 21 is bent by the first curl portion 132 and the second curl portion 141, respectively, and further bent, so that both end portions 221 and 222 of the elastic material sheet 21 are formed. Since it is formed into a cylindrical shape by being overlapped and joined, the possibility of occurrence of defects such as cracks in the elastic material sheet 21 is reduced by performing the bending process step by step. Since the bent one end 221 and the other end 222 are processed so as to overlap in the radial direction, the joining operation can be easily performed.

In the above description, the elastic material sheet 21 which is the plate body 21 is processed by the pre-processing device 3 in a state where the positioning cutout portion 24 and the position instruction portion 25 are all formed in the resin layer to be the plate portion 23. However, of course, only the plate body 21 before the plate part 23 is formed can be bent.

Further, the elastic material sheet 21 is applicable not only to the above-described materials but also to other metal materials.

In the above description, the elastic material sheet 21 is processed into a cylindrical shape using the pre-processing device 3 and the cylindrical forming device 4, but the pre-processing device 3 and the cylindrical forming device 4 described above are examples.

The pre-processing device 3 processes the elastic material sheet 21 into a cylindrical shape using other devices as long as at least the two ends 221 and 222 of the elastic material sheet 21 are bent with different curvatures. It may be present and is not limited to the configuration described above.

For example, as described above, the curved portion 132 (first curl portion 132) set to have a higher curvature than the plate mounting surface 141 (second curl portion 141) of the holding portion 14 is provided, and the elastic material sheet 21 is provided. Although it is preferable that the elastic material sheet 21 is wound around the plate cylinder 1 while being fixed to the first curl portion 132, it is preferable to wind the elastic material sheet 21, but a cylinder member like the cylindrical molding device 4 described above is preferable. The elastic material sheet 21 is pressed upward from the lower side of the cylinder member 41 along the outer peripheral surface of the cylinder member 41. When the elastic material sheet 21 is formed into a cylindrical shape, the end portion side that enters the inside has a high curvature. It may be configured to be bent.

Further, for example, the pre-processing device 3 does not include the plate cylinder 1, and at least the first curl portion 132 that performs bending of the one end portion 221 of the elastic material sheet 21 and the other end portion 222 of the elastic material sheet 21. If the second curl portion 141 is formed to bend with a curvature lower than the curvature of the one end portion 221, and then the cylindrical printing plate 2 is finally formed, The elastic material sheet 21 may be configured not to have a curvature at an intermediate portion thereof.

Of course, the number of times the elastic material sheet 21 is processed until the cylindrical printing plate 2 is obtained is not limited to that described above, and the elastic material sheet 21 is formed into a cylindrical shape through a plurality of stages. If it is.

In the above description, the cylindrical forming device 4 is used in the second processing. However, the pre-processing device 3 described above is further provided with a joining machine 46 and the like, and is formed into a substantially cylindrical shape after the first processing of the elastic material sheet 21. The joining step may be performed by replacing the sheet 21 made of elastic material.

The pre-processing method as described above is based on the pre-processing device 3 used before processing the metal-made rectangular elastic material sheet 21 and forming it into the cylindrical printing plate 2.
A step of bending the one end portion 221 of the elastic material sheet 21, and a step of bending the other end portion 222 of the elastic material sheet 21 with a curvature lower than the curvature of the one end portion 221 of the elastic material sheet 21; Therefore, the elastic material sheet 21 is defective such as cracks by being formed into a cylindrical shape after being bent at both ends 221 and 222 of the elastic material sheet 21 by the pre-processing device 3. This reduces the possibility that the cylindrical printing plate 2 can be formed with high accuracy.

Moreover, since the one end part 221 and the other end part 222 of the elastic material sheet 21 are bent with different curvatures, when the elastic material sheet 21 is removed from the pre-processing apparatus 3 and formed into a cylindrical shape after the bending process. Since the one end portion 221 and the other end portion 222 of the elastic material sheet 21 are positioned so as to overlap each other in the radial direction in advance, the workability is not deteriorated because the both end portions 221 and 222 are in contact with each other. The work of superimposing both end portions 221 and 222 can be performed efficiently, and the cylindrical forming process becomes easy.

Also, it is obvious that the pre-processing apparatus 3 as described above has the same effect as the above-described effect.

The embodiment described above is merely an example of the present invention, and it is needless to say that the specific configuration and the like can be appropriately changed and designed within the scope of the effects of the present invention.

The present invention is used for forming a printing plate for printing a metal can body. This application is accompanied by the priority claim of Japanese Patent Application No. 2016-4706 filed on Jan. 13, 2016, the disclosure of which constitutes part of the present application as it is. .

The terms and expressions used herein are for illustrative purposes and are not to be construed as limiting, but represent any equivalent of the features shown and described herein. It should be recognized that various modifications within the claimed scope of the present invention are permissible.

While this invention may be embodied in many different forms, this disclosure is to be considered as providing examples of the principles of the invention, which examples are hereby incorporated by reference. Many illustrated embodiments are described herein with the understanding that they are not intended to be limited to the preferred embodiments described and / or illustrated.

Although several illustrated embodiments of the present invention have been described herein, the present invention is not limited to the various preferred embodiments described herein, and is equivalent to what may be recognized by those skilled in the art based on this disclosure. Any and all embodiments having various elements, modifications, deletions, combinations (eg, combinations of features across the various embodiments), improvements and / or changes are encompassed. Claim limitations should be construed broadly based on the terms used in the claims, and should not be limited to the embodiments described herein or in the process of this application, as such The examples should be construed as non-exclusive.

DESCRIPTION OF SYMBOLS 1 ... Plate cylinder 2 ... Printing plate 3 ... Pre-processing apparatus 13 ... Fixed part (mounting part)
14 ... Fixing part (holding part)
21 ... Sheet made of elastic material (plate body)
22 ... plate portion 34 ... pressing portion 211 ... one end portion 212 ... other end portion 111 ... second curl portion (plate mounting surface)
132 ... 1st curl part (curved part)
141: Second curl portion (plate mounting surface)

Claims (10)

1. It is a pre-processing method by a pre-processing device used before processing a sheet made of a metal and rectangular elastic material to form a cylindrical printing plate,
   Bending one end of the elastic material sheet;
   Bending the lower end of the elastic material sheet with a lower curvature than the one end of the elastic material sheet; and
   A pre-processing method comprising:
2. The portion excluding one end portion of the elastic material sheet and the other end portion of the elastic material sheet is subjected to bending with a curvature lower than the curvature of the one end portion of the elastic material sheet. The pre-processing method according to 1.
3. The pre-processing device includes a plate cylinder that is formed in a cylindrical shape and on which an elastic material sheet is wound around an outer peripheral surface,
   The plate cylinder is continuous from the outer peripheral surface of the plate cylinder, a first curl portion formed of a curved surface located inside the outer peripheral surface of the plate cylinder, a second curl portion formed of an outer peripheral surface of the plate cylinder, Have
   The elastic material sheet is wound around an outer peripheral surface of the plate cylinder, the one end portion is bent by the first curl portion, and the other end portion is bent by the second curl portion. The pre-processing method according to claim 2.
4. The pre-machining method according to claim 3, wherein the radius of curvature of the first curled portion is set to be 0.4 times or more and 0.8 times or less of the radius of curvature of the second curled portion.
5. The plate cylinder includes a fixing portion having the first curl portion located inside the outer peripheral surface of the plate cylinder,
   The processing is performed by winding and mounting the elastic material sheet around the plate cylinder in a state where one end portion of the elastic material sheet is fixed by the fixing portion. 4. The pre-processing method according to 4.
6. The pre-processing apparatus includes a pressing portion that presses an outer peripheral surface of the elastic material sheet attached to the plate cylinder to a radially inner side of the plate cylinder,
   The pressing portion presses the outer peripheral surface of the elastic material sheet when the plate cylinder rotates while the elastic material sheet is wound around and attached to the outer peripheral surface of the plate cylinder. The pre-processing method according to any one of claims 3 to 5.
7. The pre-processing method according to claim 6, wherein the pressing portion is configured to be movable back and forth in the radial direction of the plate cylinder according to the thickness of the elastic material sheet.
8. The pre-treatment according to any one of claims 1 to 7, wherein a bending process having a curvature higher than a curvature of the other end portion of the elastic material sheet is applied to a portion near the center of the one end portion of the elastic material sheet. Processing method.
9. The pre-processing method according to claim 8, wherein the end portion side of the elastic material sheet is formed flatter than the central portion of the one end portion.
10. It is a pre-processing device used before processing a sheet made of metal and a rectangular elastic material into a cylindrical printing plate,
    A first curl portion that bends one end of the elastic material sheet;
    A second curl portion that bends the other end portion of the elastic material sheet with a curvature lower than the curvature of the one end portion of the elastic material sheet;
    A pre-processing apparatus comprising:
    

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