JP4520008B2 - Plate making equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plate making apparatus, and more particularly to a plate making apparatus and a support structure for a master roll used therefor.
[0002]
[Prior art]
As a simple printing apparatus, a thermal digital plate-making type stencil printing apparatus is known. In this stencil printing apparatus, a thermal stencil master (hereinafter referred to as “master”) having a thermoplastic resin film is heated and punched by a thermal head in accordance with image information, and the plate-making master having been heated and punched is subjected to a plate cylinder. Ink is supplied from the inside of the plate cylinder. Then, the ink supplied from the inside of the plate cylinder oozes out on the surface of the plate cylinder, and the printing paper is pressed against the surface of the plate cylinder by a pressing means such as a press roller or an impression cylinder through the master made of the plate, The ink that oozes from the perforated portion of the master is transferred to the printing paper and the image is printed.
[0003]
An apparatus for punching and making a plate on a master by a thermal head is called a plate making apparatus or a plate making writing apparatus. As a plate making apparatus, the master supports the master so that it can be fed out from the master roll wound around the core tube, can contact the end surface portion of the core tube, and fits into the core tube to fit the master roll. 2. Description of the Related Art A master roll supporting structure having master roll supporting means for positioning and supporting in a rotatable manner is known.
[0004]
Regarding the support structure of the master roll in such a plate making apparatus, the applicant of the present application has proposed a new technique in Japanese Patent Application Laid-Open No. 2000-43227 paying attention to the following problems and solving them. That is, in Japanese Patent Laid-Open No. 2000-43227, when the master roll direct setting method is adopted or when the roll flange on the master roll support means side does not rotate, abnormal noise is generated or the master back tension is increased. A master roll support structure in an improved plate making apparatus in which the variation in (tension) does not increase or the master of the end face portion of the master roll does not break has been proposed.
[0005]
Hereinafter, in order to clarify the difference from the embodiment described later, the problem of the support structure of the master roll in the plate making apparatus proposed in Japanese Patent Application Laid-Open No. 2000-43227 will be described with reference to FIGS. . 7 and 8 show the configuration of the main part similar to the master roll support structure in the plate making apparatus described in FIG. 1 of Japanese Patent Laid-Open No. 2000-43227.
[0006]
7 and 8, reference numeral 1 is a sheet-shaped master, reference numeral 2 is a master roll formed by winding the master 1 in a roll shape, and reference numeral 3 is a pipe-shaped core tube. When the master roll 2 is formed, a paper tube serving as a core shaft around which the master 1 is wound, and a reference numeral 16 denotes a master holding unit.
[0007]
The master 1 has a laminated structure in which a porous support made of a Japanese paper fiber or synthetic fiber, or a mixture of both materials is attached to a thin thermoplastic resin film having a light transmittance of about 1 to 2 μm. In this case, the material is punched by heating with a heating element such as a thermal head as plate making means.
The paper tube 3 is formed to have the same length as the width of the master 1 or slightly longer in the axial direction. In the example of the paper tube 3 shown in FIGS. 7 and 8, each end surface portion 3a of the paper tube 3 is formed slightly longer than each end surface 2a of the master roll 2, and protrudes outward from each end surface 2a. The paper tube 3 is formed by winding a relatively thick web-like paper obliquely to form a long paper pipe and cutting it into a predetermined dimension.
[0008]
The master holding unit 16 is in contact with the end surface portion 3a of the paper tube 3 on both sides of the master roll 2, and is fitted into the paper tube 3 to support the master roll 2 rotatably. It has. The master holding unit 16 has a plate making insertion position inserted into the main body of the plate making apparatus 15 shown in parentheses by borrowing FIG. 5, and a roll attaching / detaching position for attaching / detaching the master roll 2 that is out of the plate making insertion position (see FIG. (Not shown) through a guide rail 79 disposed on the main body side of the plate making apparatus 15 and is slidable in the arrow directions F and R in the figure. Here, the roll attaching / detaching position includes a position slid outward from the stencil printing apparatus incorporating the plate making apparatus 15.
[0009]
7 and 8, the symbol T indicates the master conveyance direction in which the fed master 1 is conveyed, and the symbol MB is orthogonal to the master conveyance direction T and the axial direction of the master roll 2 (longitudinal direction of the core tube 3). The master width direction, which is also the direction parallel to, is shown.
Note that the roll flange pairs 4a and 4b are shown in parentheses in FIGS. 4 and 5 and are distinguished from the roll flange pairs 4Aa and 4Ab in the embodiments described later. Similarly, the plate making apparatus 15 is shown with parentheses borrowed from FIG. 5, and is distinguished from the plate making apparatus 15A of the embodiment described later. Further, the master holding unit 16 is shown in parentheses in FIGS. 4 and 5 and is distinguished from the master holding unit 16A of the embodiment described later.
[0010]
The roll flange pairs 4a and 4b are disposed on both sides of the roll cradle 27 shown in FIG. 4 and FIG. A pair of roll flanges 4a and 4b includes a conical surface portion 4c of the same size that can be fitted into the paper tube 3 of the master roll 2, and a relief recess 4d as a relief for avoiding contact with the end surface 2a of the master roll 2. An insertion support portion surface 4f that fits loosely into the paper tube 3 of the master roll 2 and a sheet attachment portion 4g that attaches a Mylar sheet 10 to be described later are integrally formed.
[0011]
The outer diameter of the insertion support portion surface 4f of the roll flange pair 4a, 4b is formed to be slightly smaller than the inner diameter of the paper tube 3. The roll flange pairs 4a and 4b are made of a general-purpose plastic such as acrylonitrile butadiene styrene resin (ABS resin), polystyrene (PS), or polycarbonate resin (PC).
[0012]
The sheet sticking part 4g of the roll flange pair 4a, 4b reduces the frictional force when the roll flanges 4a, 4b and the end face part 3a of the paper tube 3 come into contact with each other, and the frictional force falls within a predetermined range. A Mylar sheet 10 made of PET (polyethylene terephthalate) as a friction reducing means for stabilizing the film is adhered and fixed with an adhesive. The mylar sheet 10 is formed to be slightly larger than the outer diameter of the end surface portion 3a of the paper tube 3, and has a substantially ring shape.
[0013]
The right side roll flange 4b in FIGS. 7 and 8 is fixed to one inner wall of the roll cradle 27 shown in FIG. 4 and FIG. On the other hand, the left side roll flange 4a in the figure is connected to the master width via a guide member 5 fixed to the inner wall of a flange support plate 26, which is a member different from the roll cradle 27, and facing and protruding toward the roll flange 4b. It is movable in the direction MB and cannot rotate. An insertion hole 4e having a round hole-like cross section for inserting the guide member 5 loosely into the roll flange 4a and a projection section 5b of the guide member 5 described later having a function of preventing rotation of the roll flange 4a by loosely fitting. A guide groove 4h having a shape is formed, and the entire cross-section is a round shape with a key groove (see FIG. 3 to be borrowed).
[0014]
The guide member 5 is made of a metal such as stainless steel, for example, and has a cross-sectional shape of a round bar with a key. A head 5a that restricts the movement of the roll flange 4a is provided at the right end of the guide member 5, and the roll flange 4a is provided on the guide member 5 in parallel with the master width direction MB and the insertion support portion surface 4f on the roll flange 4b side. And a protrusion 5b having a rectangular shape for slidingly and coaxially guiding the insertion support portion surface 4f on the roll flange 4a side in parallel (see FIG. 3 to be borrowed).
[0015]
In the guide member 5 between the inner wall of the flange support plate 26 and the left end wall of the roll flange 4a, the sheet sticking portion 4g of the roll flange 4a is pressed against the end surface portion 3a of the paper tube 3 via the mylar sheet 10. A compression spring 6 for energizing is wound around. The compression spring 6 acts to press the sheet sticking part 4g of the roll flange 4a against the end face part 3a of the paper tube 3 via the mylar sheet 10, so that the paper tube is rotated when the master roll 2 rotates in the feeding direction. 3, each of the end surface portions 3 a and each mylar sheet 10 generates a predetermined range of frictional force to resist the master 1 from being fed out of the master roll 2, in other words, pulled out from the master roll 2. The master 1 has a function of generating back tension (tension). Thereby, there exists an advantage which can eliminate the slack which is easy to occur when the master 1 is extended.
[0016]
As described above, when the master holding unit 16 occupies the plate making insertion position, the roll flange 4a can come into contact with one end surface portion 3a of the paper tube 3 via the mylar sheet 10 and the master roll 2 Positioning position (position indicated by phantom lines in FIG. 4 to be borrowed) and a non-positioning position (borrowing) that is separated from one end surface portion 3a of the paper tube 3 when the master holding unit 16 occupies the roll attachment / detachment position. (Position shown by a solid line in FIG. 4) that functions as roll positioning means that can move freely.
In FIG. 3 to borrow, FIG. 4 and FIG. 7 to borrow, the roll positioning guide means 30 includes the inclined guide portion 78a and the slide guide portion 78b of the side plate 78, the inclined portion 26a of the flange support plate 26, the slide portion 26b, and the guide member 5. The protrusion 5b, the conical surface 4c of the roll flange 4Aa, the guide groove 4h, and the compression spring 6 are mainly configured.
[0017]
According to the conventional example shown in FIG. 7 and FIG. 8, the Mylar sheet 10 is attached, and the roll flange pair 4 a and 4 b each having the relief recess 4 d and the compression spring 6 are provided. Even if the end face portion 3a of each paper tube 3 and the Mylar sheet 10 are in direct contact with each other and are rotated while being pressed, the conventional noise (a rubbing sound called a key key) is not generated.
Further, the difference in pulling force required to pull out the master 1 from the master roll 2 can be suppressed in a small range between when the master roll 2 having a large roll diameter is first used and when the master roll 2 having a small roll diameter is used. In other words, the variation in the back tension of the master 1 can be substantially halved as shown in FIGS. 4 (a) and 4 (b). As a result, there is an effect that the dimensional reproduction accuracy of the image is also stabilized by stabilizing the feed amount of the master 1.
[0018]
[Problems to be solved by the invention]
However, burrs 3 </ b> A of various sizes are generated at both end edges inside the paper tube 3 in the master roll 2 when the paper tube 3 is cut. The cutting of the paper tube 3 is performed using a circular saw electric cutter equipped with a saw blade in order to reduce man-hours and costs. When the paper tube 3 is cut, the burr 3A is mainly used when a circular saw electric cutter (not shown) is moved from the upper part to the lower part of the paper tube 3 as shown in an enlarged view in FIG. However, in FIG. 7 including FIGS. 1 and 6 to be referred to later, it is considered that the master roll 2 rotates with respect to the fixed roll flange pair 4a and 4b. For the sake of convenience, it is shown that it occurs over the entire circumference of both end edges inside the paper tube 3.
[0019]
When there are no burrs 3A at both end edges inside the paper tube 3, the inner peripheral surface of the paper tube 3 is in surface contact with the fitting support surface 4f of the roll flange pair 4a, 4b, so that there is relatively little variation. Friction resistance (friction load) in the range occurs. However, the burrs 3A generated at both end edges inside the paper tube 3 are each one of the paper tubes 3 at the time of cutting the paper tube 3 (from the inner peripheral surface of the paper tube 3 to the paper tube 3). Since the height dimension toward the center and the length dimension in the longitudinal direction of the paper tube 3 are different), if the burr 3A is large, the inner diameter of the paper tube 3 is reduced or the inner periphery of the paper tube 3 is fitted. Since the support surface 4f is in line contact, the variation width of the friction load with the paper tube 3 is increased, and the friction load varies for each master roll 2, that is, applied to the master 2 drawn from the master roll 2. Will cause the back tension to vary.
In particular, as shown in FIGS. 7 and 8, when the roll flange pair 4a, 4b does not rotate (fixed) and only the master roll 2 rotates, the inner peripheral portion of the paper tube 3 and the insertion support portion surface Due to the rotational contact with 4f, the inner peripheral portion of the burr 3A generating portion of the paper tube 3 is worn, which causes the back tension to vary.
[0020]
It should be noted that it is not difficult to remove the burrs 3A generated at both ends of the inner side of the paper tube 3 as long as man-hours and costs are spent. Then, it can be said that handling on the stencil printing apparatus main body side using hundreds of master rolls as a supply is the best countermeasure from the viewpoint of reducing man-hours and costs.
Further, the core tube is not limited to the paper tube 3 described above, but may be made of a synthetic resin such as acrylonitrile butadiene styrene resin (ABS resin) or polycarbonate resin (PC). In addition to the cost increase, the core tube is inevitably generated with burrs 3A at the time of cutting, and even when molded by an injection molding method, burrs 3A are generated due to parting.
[0021]
Therefore, the present invention has been made in view of the above-described circumstances, and the object of the present invention is a case where a direct setting method of a master roll is adopted or a method in which a roll flange (master roll support means) does not rotate. In some cases, even if burrs are generated on the inner edge of the core tube (paper tube), the use of the same master roll is started as well as minimizing variations in the back tension (tensile force) of each master roll. Another object of the present invention is to provide a plate making apparatus that can suppress variations in back tension until the end of use, and can stabilize the dimensional reproduction accuracy of an image by stabilizing the feed amount of the master.
In addition to the above purpose, the material and material of the roll flange (master roll support means) that contacts the core pipe of the master roll is made of a material that is slippery with reduced frictional resistance and has high wear resistance. Accordingly, it is an object of the present invention to provide a plate making apparatus that can always obtain a stable back tension, and thereby can further stabilize the image size reproduction accuracy by further stabilizing the feed amount of the master.
In addition to the above-mentioned purposes, the master roll support means and the end face of the core tube are brought into contact with each other via the friction reducing means, thereby generating abnormal noise associated with the rotation of the master roll and the core tube. It is an object of the present invention to provide a plate making apparatus that can prevent and always obtain a stable back tension, thereby further stabilizing the dimensional reproduction accuracy of an image by further stabilizing the feed amount of a master.
[0022]
[Means for Solving the Problems]
In order to solve the above-described problems and achieve the object, the invention described in each claim employs the following characteristic configurations.
According to the first aspect of the present invention, the master is in contact with the end surface portion of the core roll of the master roll wound around the core pipe, and is fitted into the core pipe so that the master roll can be rotated. In the plate making apparatus having a supporting master roll supporting means, the master roll supporting means has a relief for avoiding contact with the end edge at a portion facing the inner edge of the core tube. And
Here, the “end surface portion of the core tube” refers to a portion of the end surface of the core tube itself, and is shown in FIGS. 1, 2, 6, 6, 7 and 8 referred to in the embodiments described later. Thus, it means that the part of the end surface side of the core pipe among the burrs generated at the end edge of the core pipe is also included.
[0023]
According to a second aspect of the present invention, in the plate making apparatus according to the first aspect, the master roll support means reduces a frictional force when coming into contact with the end face of the core tube and / or the master roll, and wear resistance. It is formed by the material which has property.
Here, the portion where the master roll support means contacts the core tube includes the inner peripheral surface of the core tube and the end surface portion of the core tube.
[0024]
According to a third aspect of the present invention, in the plate making apparatus according to the first or second aspect, the master roll includes a friction reducing means for reducing a frictional force when the master roll supporting means and the end surface portion of the core tube abut. It is provided on the end surface portion of the supporting means and / or the core tube.
Here, as the arrangement position of the friction reducing means, as described above, it may be provided on the end surface portion of the master roll supporting means and / or the core tube, but when provided on the end surface of the master roll supporting means and the core tube, When it is provided on the end surface portion of the core tube, it is necessary to provide the master roll for each of the master rolls, which is disadvantageous in terms of cost. Therefore, the arrangement position of the friction reducing means is determined from the standpoint of durability of the friction reducing means according to the arrangement position of the friction reducing means, stabilization of the frictional force for putting the frictional force within a predetermined range, and economical efficiency. It is preferable to provide at the site | part which contact | abuts to the roll support means, ie, the end surface part of the core pipe of the master roll support means side.
Further, from the same reason as described above and from the viewpoint of facilitating the mounting workability, the friction reducing means is formed to be substantially the same as the outer diameter of the end face of the core tube or slightly smaller than the outer diameter. A sheet-like material is preferable.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention including examples will be described with reference to the drawings (hereinafter simply referred to as “embodiments”). In the conventional example and the embodiment shown in FIGS. 7 and 8, the constituent elements such as members and components having the same function and shape are denoted by the same reference numerals, and the description thereof is omitted as much as possible. In order to simplify the drawings and the description, even if the components are to be represented in the drawings, the components that do not need to be specifically described in the drawings may be omitted as appropriate. In the figure, components that are configured in a pair and do not need to be specifically distinguished and described are described by appropriately describing one of them for the sake of simplification of description.
[0026]
1 to 5 show an embodiment of the plate making apparatus of the present invention. This embodiment is different from the plate making apparatus 15 shown in FIG. 3 of Japanese Patent Laid-Open No. 2000-43227 described in the conventional example, and the master holding unit 16 shown in FIGS. 2 and 3 of the publication. Instead, the only difference is that the plate making apparatus 15A having the master holding unit 16A is provided.
The embodiment described in Japanese Patent Laid-Open No. 2000-43227 is one step ahead of the previous embodiment shown in FIGS. 1 and 2 of Japanese Patent Laid-Open No. 9-226088. Instead of the plate making apparatus 20 having the master holding unit 21 in the conventional embodiment, the only difference is that the plate making apparatus 15 having the master holding unit 16 is provided.
[0027]
First, with reference to FIG. 5, the structure of the principal part of the stencil printing apparatus as a printing apparatus to which the plate making apparatus 15A is applied will be briefly described. The stencil printing apparatus shown in FIG. 5 includes a stencil printing process unit in which a plate cylinder 14 having a clamper 13 that clamps and holds the leading end of the master 1 that has been subjected to plate making is disposed. The apparatus mainly includes a paper device, a plate discharge unit, a paper discharge unit, and the plate making device 15A. In the stencil printing apparatus, the plate making apparatus 15A has a novel configuration according to the present invention, and the other sheet feeding apparatus, the plate discharging section, the sheet discharging section, and the like are shown in Japanese Patent Laid-Open No. 9-226088. 1 and the configuration similar to that shown in FIG.
[0028]
The plate making apparatus 15A is mainly composed of the master holding unit 16A, the platen pressure control unit 55, and the cutting unit 70, and the configuration around the platen pressure control unit 55 and the cutting unit 70 other than the master holding unit 16A is special. Since it has the same configuration as that shown in FIG. 1 and FIG. 2 of Kaihei 9-226088 and that shown in FIG. 3 of Japanese Patent Laid-Open No. 2000-43227, duplicate explanation will be given. For the sake of avoidance, only the main component names and their functions are described briefly.
In FIG. 5, reference numeral 51 denotes a guide member, 56 denotes a thermal head, 57 denotes a head base, 65 denotes a platen roller, 71 denotes a rotary cutter, 72 denotes a first conveying roller pair, Reference numeral 74 denotes a second conveying roller pair.
[0029]
The guide member 51 is provided on the master conveyance path MR between the vicinity of the pressing portion between the thermal head 56 and the platen roller 65 and the guide plate 35, and when the master holding unit 16A occupies the plate making insertion position shown in FIG. Further, it has a function as a master introducing means for positioning and introducing the front end of the master 1 engaged with the guide plate 35 and conveyed by the drawing roller 40 in the vicinity of the pressing portion.
The thermal head 56 has a plurality of heating elements arranged along the main scanning direction corresponding to the axial direction of the platen roller 65, and selectively heats the heating elements by selective energization control on the heating elements. Therefore, it has a well-known function as a plate making means for perforating by heating and melting the portion of the master 1 corresponding to the heat generation position. As a result, the thermal head 56 selectively heats and perforates the master 1 that is fed from the master roll 2 and conveyed by the rotation of the drawing roller 40. The thermal head 56 can be brought into and out of contact with the platen roller 65 by a platen pressure control means which is not described here.
[0030]
The platen roller 65 rotates while pressing the masterless plate 1 conveyed by the rotation of the drawing roller 40 or the platen master 1 heated and perforated by the thermal head 56 between the platen roller 65 and the thermal head 56. It has a well-known function of conveying to the downstream side of MR. The platen roller 65 is made of, for example, silicon rubber or the like, and has a friction coefficient larger than that of the drawing roller 40 with respect to the master 1. The platen roller 65 is rotationally driven via a driving force transmission mechanism (not shown) that transmits the rotational driving force of a driving motor (not shown), which is not described here, to the platen roller 65.
[0031]
The head base 57 is supported so as to be able to swing with the base shaft inserted through base shaft holes formed on both side walls thereof and supported by both side plates 78 shown in FIG. The head base 57 and the guide mounting portion have a function of a swinging member that supports the thermal head 56 so as to be swingable.
[0032]
The rotary cutter 71 has a function as a cutting means for cutting the rear end portion of the master 1 that has been made by the platen or the master 1 that has not been made by the platen roller 65. A guide rail for reciprocating the rotary cutter 71 in the master width direction MB is arranged in the master width direction MB in the vicinity of the rotary cutter 71 arrangement portion. The rotary cutter 71 has a known configuration that can move in the master width direction MB while rotating. The rotary cutter 71 traverses the master conveyance path MR while rotating only when the master 1 that has been pre-made or the master 1 that has not been pre-cut is cut, and usually the guide rail in the master width direction MB. Is waiting at one end of the master 1 so as not to hinder the conveyance of the master 1. The rotary cutter 71 is rotated and moved by a cutter drive motor (not shown). The cutting part 70 provided with the rotary cutter 71 and the guide rail has a known configuration similar to, for example, FIG. 1 of JP-A-7-101135.
[0033]
The upper roller 72 of the first conveying roller pair 72 is a driving roller formed integrally with the shaft, and the lower roller 72 is a driven roller formed integrally with the shaft, both shown in FIG. It is rotatably supported between the two side plates 78 (only the left side is shown in FIG. 4). The upper driving force of the drive motor is transmitted to the upper roller 72 via a first rotational force transmission mechanism that transmits the rotational driving force of the driving motor as a master transport driving means to the first transport roller pair 72. .
Similarly, the upper roller 74 of the second conveying roller pair 74 is a drive roller formed integrally with the shaft, and the lower roller 74 is a driven roller formed integrally with the shaft. 4 is supported rotatably between both side plates 78 shown in FIG. The upper driving force of the driving motor is transmitted to the upper roller 74 via a second rotating force transmission mechanism that transmits the rotational driving force of the driving motor to the second conveying roller pair 74.
The second conveying roller pair 74 has a peripheral speed slightly higher than the peripheral speed of the first conveying roller pair 72 via the second rotational force transmission mechanism, and the first conveying roller pair 72 transmits the first rotational force. It is preset in advance so as to rotate at a peripheral speed slightly faster than the peripheral speed of the platen roller 65 via the mechanism.
[0034]
On the main body side of the plate making apparatus 15A, a pair of left and right sheet metal side plates 78 are disposed in parallel to each other. 4 and 5, the master holding unit 16A is interposed between the plate making insertion position and the roll attaching / detaching position by engaging with the slide rails 27c of the roll receiving base 27 as shown in FIGS. A pair of left and right guide rails 79 are formed as guide means for slidably guiding them. These guide rails 79 are respectively engaged with the slide rails 27c at channel-shaped portions that open to the inside.
[0035]
As shown in FIGS. 1 to 5, the master holding unit 16 </ b> A is arranged in the master holding unit 16 as compared with the master holding unit 16 shown in FIGS. 1 to 3 of Japanese Patent Laid-Open No. 2000-43227. Instead of the pair of left and right roll flanges 4a and 4b, the main difference is that a pair of left and right roll flanges 4Aa and 4Ab is provided.
The master holding unit 16A is mainly composed of a roll receiving base 27, a pair of left and right roll flanges 4Aa and 4Ab, a guide plate 35 and a drawing roller 40 described above. The configuration of the master holding unit 16A around the roll cradle 27, the guide plate 35 and the drawing roller 40 other than the configuration around the roll flange pair 4Aa, 4Ab is shown in FIGS. 1 to 6 of Japanese Patent Laid-Open No. 9-226088. In order to avoid duplication of explanation, the configuration and functions thereof are only briefly described. In the following, while supplementing the contents not explained in the conventional example shown in FIGS. 7 and 8, first, a configuration similar to that shown in FIGS. 1 to 6 of JP-A-9-226088 will be described. . The arrangement of the flange support plate 26 and the side plate 78 is opposite to that shown in FIG. 4 of JP-A-9-226088.
[0036]
As shown in FIGS. 4 and 5, the roll cradle 27 has a substantially casing shape and is integrally formed of a synthetic resin. A slightly wide opening is formed above the roll cradle 27 in order to improve the workability when the master roll 2 is attached and detached, and a cross-section approximately U that communicates with the opening and houses the master roll 2. A character-shaped storage portion 27e is formed.
[0037]
In the approximate center of the bottom wall of the roll cradle 27, an opening 27d is provided for allowing a master detection means to be described later to face when the master holding unit 16A occupies the plate making insertion position. A handle 27 b is integrally attached to the center of the rear outer wall of the roll cradle 27. The master holding unit 16A can be moved to the plate making insertion position shown in FIG. 5 by pushing the handle 27b in the direction indicated by the arrow F through the guiding means described later, and by drawing it in the arrow direction R, the plate making apparatus 15A. Can be selectively moved to the roll attaching / detaching position shown in FIG. A slide rail 27c having a channel shape whose cross section is opened upward is integrally formed at the lower part of both side walls of the roll pedestal 27, and the slide rail 27c is appropriately reinforced with sheet metal.
[0038]
As shown in FIG. 4, a pair of left and right side plates 78 (only the left side is shown in FIG. 4) is provided on the main body side of the plate making apparatus 15A (hereinafter sometimes simply referred to as “apparatus main body side”). Are arranged in parallel to each other. 5, the master holding unit 16A slides between the plate making insertion position and the roll attaching / detaching position by engaging with the slide rails 27c of the roll receiving base 27 as shown in FIG. A pair of left and right guide rails 79 are formed as guide means for guiding freely. These guide rails 79 are respectively engaged with the slide rails 27c at channel-shaped portions that open to the inside. In FIG. 5, symbol MR indicates a master transport path for transporting the master 1 fed out from the master roll 2.
The left side plate 78 in FIG. 4 on the apparatus main body side is an inclined guide portion 78a formed by bending the rear end portion thereof outward, and the right side plate 78 (not shown in FIG. 4) in FIG. It consists of the slide guide part 78b formed in parallel.
[0039]
The flange support plate 26 is made of a plating. As shown in FIG. 4, the flange support plate 26 is formed in parallel with the inclined portion 26 a formed by bending the front end portion in the arrow direction F inward and the slide guide portion 78 b of the side plate 78, and the guide member 5 and a slide portion 26b attached to the inner wall.
[0040]
In FIG. 4, the left roll flange 4 </ b> Aa is fixed to the inner wall of a flange support plate 26, which is a member different from the roll cradle 27. In FIG. 4, the right roll flange 4 </ b> Ab is fixed to one inner wall of the roll cradle 27. When the master holding unit 16A occupies the plate making insertion position, the roll flange 4Aa can come into contact with the end surface portion 3a of the core tube 3 of the master roll 2 via the mylar sheet 10 and is one core tube of the master roll 2. When the master holding unit 16A occupies the roll attachment / detachment position, the positioning position for positioning the three end surface portions 3a and the end surface portion 3a of one core tube 3 of the master roll 2 It has a function as a roll positioning means that can move between a non-positioning position (a position indicated by a solid line in FIG. 4) that is separated.
[0041]
In FIG. 4, reference numeral 30 denotes a roll positioning guide means. The roll positioning guide means 30 has a function of guiding the roll flange 4Aa as the roll positioning means so as to be movable between a positioning position and a non-positioning position.
1, 3, and 4, the roll positioning guide means 30 includes an inclined guide portion 78 a and a slide guide portion 78 b of the side plate 78, an inclined portion 26 a of the flange support plate 26, a slide portion 26 b, and a protruding portion 5 b of the guide member 5. The roller flange 4Aa is mainly composed of a conical surface portion 4c, a guide groove 4h, and a compression spring 6.
[0042]
In addition to the roll positioning guide means 30 provided only on the left side in FIG. 4, the roll positioning guide means 30 is provided on the left roll flange 4Ab side, and the roll flange 4Ab is positioned between the positioning position and the non-positioning position. Of course, it may be configured similarly to the roll flange 4Aa so as to be freely movable between the two.
[0043]
As shown in FIG. 4, a pair of guide plate support portions 27 f that are integrally formed with the roll pedestal 27 are formed at the left and right ends of the front upper portion of the roll pedestal 27. A guide plate 35 as a master guide means for placing the tip of the master 1 fed out from the master roll 2 is swingably disposed on the pair of guide plate support portions 27f. The guide plate 35 has a substantially rectangular shape in plan view and is made of a plating. The base end portion of the guide plate 35 is rotatably supported by a pair of guide plate support portions 27f via a pair of guide plate shafts 36. On the free end side of the guide plate 35, the downward swing range is regulated by a stopper (not shown) formed integrally with the guide plate support portion 27f, so that the guide plate 35 can swing by its own weight. .
[0044]
Two stepped pins 29 are planted at predetermined intervals in the vertical direction on the lower outer wall of each guide plate support portion 27 f in the roll cradle 27. An elongated plate-like roller arm 43 is disposed above the guide plate 35 and across the lower outer walls of the roll cradle 27. In the lower part of the both sides of the roller arm 43, vertically long guide grooves 43b are respectively formed, and the two stepped pins 29 are loosely fitted in these guide grooves 43b. The roller arm 43 is made of plating, and a handle portion 43a is bent upward at a right angle on the upper portion of the roller arm 43. Therefore, the roller arm 43 is supported and guided by the two stepped pins 29 within the range of the pair of left and right guide grooves 43b so as to be movable up and down.
[0045]
Between both upper side portions of the roller arm 43, a drawing roller 40 is disposed as a master transport unit that contacts the guide plate 35 via the tip of the master 1 and transports the master 1. The drawing roller 40 is formed integrally with the roller shaft 41, and is rotatably supported between both upper side portions of the roller arm 43 via the roller shaft 41. In FIG. 4, the right roller shaft 41 protrudes from the upper portion of the roller arm 43, and a roller gear 42 is fixed to the end of the roller shaft 41. The drawing roller 40 is made of a sponge-like roller such as foamed chloroprene rubber or polyurethane foam.
[0046]
As described above, the pulling roller 40 swings the guide plate 35 through the supporting and guiding operations of the stepped pin 29 and the guide groove 43b by the respective weights of the roller arm 43 and the pulling roller 40. In contact with the upper surface of the guide plate 35. When the master holding unit 16A occupies the roll attaching / detaching position, that is, when the master holding unit 16A is pulled out from the apparatus main body side to the roll attaching / detaching position, the operator holds the handle 43a of the roller arm 43 and holds the roller arm 43. Further, while lifting the pulling roller 40 upward, the leading end of the master 1 can be pulled out from the master roll 2, and the leading end of the master 1 can be placed on the upper surface of the guide plate 35. Therefore, the drawing roller 40 is configured to be able to contact and separate from the guide plate 35 when the master holding unit 16A occupies the roll attaching / detaching position.
The drawing roller 40 is selectively rotated via a roller gear 42 by a driving motor 45 and a driving force transmission mechanism as master conveying driving means similar to that shown in FIG. 6 of Japanese Patent Laid-Open No. 9-226088. It is designed to be driven.
[0047]
4 and 5, reference numeral 32 indicates a master detection sensor. The master detection sensor 32 is installed at the center of an immobile member (not shown) bridged between a pair of guide rails 79. The master detection sensor 32 is a well-known reflective optical sensor including a light emitting unit and a light receiving unit. The master detection sensor 32 can detect the reflected light obtained when the master roll 2 is loaded in the storage portion 27e of the master holding unit 16A. When the master roll 23 is located in the storage portion 27e of the master holding unit 16A, it is detected by the master detection sensor 32.
In FIG. 5, the code | symbol 33 shows a master set detection sensor. The master set detection sensor 33 is provided to detect that the master holding unit 16A is inserted into the plate making apparatus 15A and occupies the plate making insertion position. In this embodiment, the master set detection sensor 33 is provided on the lower wall of the guide rail 79 on the apparatus main body side, and only when the master holding unit 16A occupies the plate making insertion position, Engaging microswitches are used. The master set detection sensor 33 detects that the master holding unit 16A has been pushed to the plate making insertion position, detects the operation start time of the drive motor that rotates the drawing roller 40 and the like, and the detection signal is not shown. Output to the control unit.
[0048]
The master holding unit 16A has a plate making insertion position (position shown in FIG. 5) inserted into the main body of the plate making apparatus 15A, and a roll attaching / detaching position (see FIG. 4) where the master roll 2 is attached to and detached from the plate making insertion position. Between the position shown in the drawing and a position drawn further down on the paper surface) through the guide rail 79 in the direction of arrows F and R in the figure. Here, the roll attaching / detaching position includes a position slid outward from a stencil printing apparatus incorporating the plate making apparatus 15A.
[0049]
The master holding unit 16A is in contact with the end surface portion 3a of the paper tube 3 of the master roll 2 similar to that shown in FIGS. 7 and 8, and is fitted into the paper tube 3 to rotatably support the master roll 2. A pair of left and right roll flanges 4Aa and 4Ab are provided as master roll support means.
[0050]
The roll flange pair 4Aa, 4Ab of the master holding unit 16A is, as shown in FIGS. 1 to 3, compared with the roll flange pair 4a, 4b of the master holding unit 16 of the conventional example shown in FIGS. It has a relief groove 4Aj as a relief for avoiding contact with the both end edges at a portion opposite to both end edges (burr 3A generation site) inside the tube 3, and is formed of general-purpose plastic. (For example, acrylonitrile butadiene styrene resin (ABS resin), polystyrene (PS), polycarbonate resin (PC), etc.) Instead of the material (material) of the roll flange pair 4a, 4b, the inner peripheral surface of the core tube 3 The main difference is that it is made of a material (material) having a wear resistance while reducing the frictional force at the time of contact.
[0051]
The burr 3A generated at both edge portions on the inner side of the paper tube 3 is a height from the inner peripheral surface of the paper tube 3 toward the center of the paper tube 3, depending on the difference in tools and cutting conditions at the time of cutting. The length of the paper tube 3 in the longitudinal direction is 0.2 to 1.5 mm, for example 0.2 to 2 mm, and various sizes are generated, and the variation is large.
Therefore, the size of the relief groove 4Aj formed in the pair of roll flanges 4a and 4b only needs to be formed so as not to contact the large and small burrs 3A generated at both end edges inside the paper tube 3. 3, the height from the inner peripheral surface of the paper tube 3 toward the center of the paper tube 3 is, for example, 2 mm, and the length in the longitudinal direction of the paper tube 3 is, for example, about 3 mm.
[0052]
The roll flange pair 4Aa, 4Ab reduces frictional force (friction resistance) when coming into contact with the inner peripheral surface of the core tube 3, and as a material having wear resistance, for example, slidable acrylonitrile butadiene styrene resin (ABS). Resin) and slidable polyacetal resin (POM).
[0053]
The roll flange pairs 4Aa and 4Ab have the same structure and configuration as the conventional roll flange pairs 4a and 4b shown in FIGS. 7 and 8, except for the above-described features. In other words, the roll flange pair 4Aa, 4Ab has a relief recess as a relief for avoiding contact between the conical surface portion 4c of the same size that can be freely inserted into the paper tube 3 of the master roll 2 and the end surface 2a of the master roll 2. 4d, a fitting support part surface 4f that fits loosely into the paper tube 3 of the master roll 2, and a sheet sticking part 4g for sticking a mylar sheet 10 described later are integrally formed.
[0054]
The conical surface portion 4c has a truncated cone shape, the escape recess portion 4d has a ring band groove shape, and the insertion support portion surface 4f has a columnar shape. The outer diameter of the fitting support portion surface 4f of the roll flange pair 4Aa, 4Ab is formed to be slightly smaller than the inner diameter of the paper tube 3. The fitting support surface 4f of the roll flange pair 4Aa, 4Ab is fitted into the paper tube 3 of the master roll 2 and abuts against the inner peripheral surface of the paper tube 3, and the sheet bonding of the roll flange pair 4Aa, 4Ab is also performed. The portion 4g has a function of positioning the master roll 2 in the three-dimensional direction of the master transport direction T, the master width direction MB, and the height direction by contacting the end surface portion 3a of the paper tube 3 via the mylar sheet 10. Have. The conical surface portions 4 c of the roll flange pairs 4 </ b> Aa and 4 </ b> Ab have a function of automatically aligning and guiding the core tubes 3 on both sides of the master roll 2 to the three-dimensional positioning positions of the master roll 2.
[0055]
The sheet adhering portion 4g of the roll flange pair 4Aa, 4Ab reduces the frictional force when the roll flanges 4Aa, 4Ab abut on the end face portions 3a of the paper tube 3 and reduces the frictional force within a predetermined range. A PET (polyethylene terephthalate) sheet 10 as a friction reducing means for stabilizing the film is adhered and fixed with an adhesive. The mylar sheet 10 is formed to be slightly larger than the outer diameter of the end surface portion 3a of the paper tube 3, and has a substantially ring shape.
[0056]
The mylar sheet 10 has a thickness of about 0.05 to 0.3 mm. The thickness of the Mylar sheet 10 is shown somewhat exaggerated in each figure. The Mylar sheet 10 is made of a material having a high surface smoothness and a small friction coefficient that is slippery with respect to the surface state of the end surface portion 3a of the paper tube 3. The arrangement position of the Mylar sheet 10 has a configuration in which the Mylar sheet 10 is adhered to each sheet adhering portion 4g of the roll flange pair 4Aa, 4Ab from the viewpoint of durability, stabilization of frictional force and economy. Adopted.
[0057]
The friction reducing means is not limited to the Mylar sheet 10 as long as it has the above-described function. For example, the Teflon tape (trade name) or the ultra tape (trade name), or the Teflon tape or the ultra tape can be used. The surface may be coated with a metal foil such as aluminum or powder.
[0058]
The thermoplastic resin film of the master 1 is made of, for example, polyester. The thickness of the master 1 is about ½ of the conventionally used master thickness of 40 to 60 μm. In this embodiment, a thickness of 3 to 30 μm can be used. . Therefore, the outer diameter of the master roll 2 is significantly smaller and more compact than that of the conventional roll, contributing to the downsizing of the apparatus. In addition, since the master 1 can be used with a very thin thickness compared to the thickness of the conventional master, the image quality is improved by reducing the so-called fiber mesh, and the high-speed plate making by increasing the heat drilling time. Is possible. The master roll 2 is formed with a low reflectivity portion (not shown) similar to that disclosed in FIG. 8 of JP-A-9-226088.
[0059]
In the guide member 5 between the inner wall of the flange support plate 26 and the left end wall of the roll flange 4Aa, the sheet sticking portion 4g of the roll flange 4Aa is pressed against the end surface portion 3a of the paper tube 3 via the mylar sheet 10 A compression spring 6 for energizing is wound around. The compression spring 6 acts to press the sheet adhering portion 4g of the roll flange 4Aa against the end surface portion 3a of the paper tube 3 via the mylar sheet 10, so that the paper tube is rotated when the master roll 2 rotates in the feeding direction. 3, each of the end surface portions 3 a and each mylar sheet 10 generates a predetermined range of frictional force to resist the master 1 from being fed out of the master roll 2, in other words, pulled out from the master roll 2. The master 1 has a function of generating back tension (tension). Thereby, there exists an advantage which can eliminate the slack which is easy to occur when the master 1 is extended.
[0060]
Next, the operation from the attachment / detachment of the master roll 2 to the winding of the master 1 around the plate cylinder 14 is only partially different from the operation due to the difference in the partial configuration of the roll positioning guide means 30. Since the operation is basically the same as the operation disclosed in the Kaihei 9-226088, the description of the other operations will be omitted by describing only the different operations.
[0061]
In the state where the master holding unit 16A occupies the plate making insertion position as shown in FIG. 5, when the remaining amount of the master 1 in the master roll 2 runs out or the master roll 2 itself does not exist, By operating the handle 27b of 27, the locked state of the master holding unit 16A is released and the master holding unit 16A is pulled out in the arrow direction R outward of the plate making apparatus 15A, whereby the slide rail of the roll receiving base 27 is obtained. The master holding unit 16A occupies the roll attaching / detaching position while 27c slides in the guide rail 79 of the side plate 78.
[0062]
The pull-out amount for the master holding unit 16A to occupy the roll attachment / detachment position allows the master roll 2 to be attached / detached, and at least the operator can see the pull-out roller 40 and can operate the handle portion 43a of the roller arm 43. It is supposed to be in a state. And since the platen pressure in the platen pressure control part 55 with respect to the master 1 is cancelled | released, the master roll 2 does not receive resistance at the time of pulling out outward of the platemaking apparatus 15A. In FIG. 4, the master holding unit 16 </ b> A is moved in the arrow direction R in the slide portion 26 b of the flange support plate 26 slidably in contact with the slide guide portion 78 b of the side plate 78 under the biasing force of the compression spring 6. By being moved, the engagement with the slide guide portion 78b is released, and then the inclined guide portion 78a of the side plate 78 and the inclined portion 26a of the flange support plate 26 are engaged and slidably contacted. As a result, the conical surface portion 4c of the roll flange 4Aa enters the paper tube 3 on the left side of the master roll 2 from the positioning position indicated by the phantom line in FIG. The master roll 2 and the roll flange 4Aa are released from the fitted / engaged state by being displaced to a non-positioning position indicated by a solid line that has left the base.
[0063]
Then, in a state where the master holding unit 16A occupies the roll attaching / detaching position, the operator removes the used master roll 2 from the storage portion 27e of the roll receiving base 27, and then prepares an unused new master roll 2. The conical surface portion 4c of the roll flange 4Ab is fitted into the paper tube 3 on the right side of the new master roll 2. Next, the operator pulls out the tip of the master 1 from the master roll 2, holds the handle 43 a of the roller arm 43, lifts the roller arm 43 and the pulling roller 40 upward, and puts the tip of the master 1 on the guide plate 35. After placing, the roller arm 43 and the drawing roller 40 are returned to the positions shown in the downward direction. That is, the operator places the pulling roller 40 on the guide plate 35 on which the front end portion of the master 1 is placed, so that the weight of the roller arm 43 and the pulling roller 40 causes the weight between the guide plate 35 and the pulling roller 40. The tip of the master 1 is held between the two.
[0064]
Next, the operator operates the handle 27 b of the roll cradle 27 to push the master holding unit 16 </ b> A in the arrow direction F toward the plate making apparatus 15 </ b> A against the urging force of the compression spring 6. By this operation, an operation opposite to the above-described operation pulled out from the plate making apparatus 15A in the arrow direction R is performed. That is, the slide rail 27c of the roll pedestal 27 slides within the guide rail 79 of the side plate 78, and in FIGS. 4 and 5, the inclined guide portion 78a of the side plate 78 against the biasing force of the compression spring 6 The engagement / sliding contact state of the flange support plate 26 with the inclined portion 26a is shifted to the engagement / sliding contact state of the slide guide portion 78b and the slide portion 26b.
In parallel with the operation in which the master holding unit 16A occupies the plate making insertion position, the roll flange 4Aa is displaced from the non-positioning position to the positioning position in FIGS. At this time, the conical surface portion 4c of the roll flange 4Aa completely enters and fits into the paper tube 3 on the left side of the master roll 2, and the sheet sticking portion 4g of the roll flange 4Aa passes through the mylar sheet 10 to the master roll 2. The master roll 2 is positioned in the three-dimensional direction in contact with the end face portion 3a of the core tube 3, in other words, automatically aligned and rotatably supported by the roll flange pairs 4Aa and 4Ab. It is loaded into the holding unit 16A. In this manner, the master roll 2 can be attached and detached with a simple one-touch operation.
[0065]
Further, in the state in which the master roll 2 is set and loaded on the pair of roll flanges 4Aa and 4Ab in the master holding unit 16A of the present embodiment, as shown in FIG. 4A of Japanese Patent Laid-Open No. 2000-43227. Thus, the pulling force required for pulling out the master 1 from the master roll 2, that is, the back tension (tension) of the master 1 when the master roll 2 having a large roll diameter is started and when the master roll 2 having a small roll diameter is ended. Was measured for the number of specimens n = 10.
The measurement result of the back tension (tension: BT) in the present embodiment was the minimum value BT to the maximum value BT = 3.234N to 3.920N (330 gf to 400 gf, the difference 0.686N (70 gf)). Compare this result with the measurement results (minimum value BT to maximum value BT = 2.842N to 4.116N (290 gf to 420 gf)) shown in FIG. It was found that the back tension in this embodiment is sufficiently effective because both the width and range of variation are smaller than those of the conventional example.
[0066]
As described above, according to the present embodiment, the same advantages as those of the conventional example can be obtained, and generated at each end edge inside the paper tube 3 by the relief grooves 4Aj provided in the roll flange pairs 4Aa and 4Ab. Since the burrs 3A and the roll flange pairs 4Aa and 4Ab are not in contact with each other, variation in back tension for each master roll 2 can be suppressed, and the same master roll 2 can be used. In addition, the variation in back tension can be suppressed until the end of use, whereby the feed amount of the master 1 is stabilized and the dimensional reproduction accuracy of the image can also be stabilized.
Further, when the roll flange pair 4Aa, 4Ab comes into contact with the inner peripheral surface of the core tube 3 or due to variations in the position of the end surface 2a of the master 1 wound around the master roll 2, the end surface 2a of the master roll 2 and the roll flange Even if the inner walls of the pair 4Aa and 4Ab come into contact with each other, the frictional force (friction resistance) is reduced and the wear-resistant material is used. Therefore, the roll flange pair 4Aa and 4Ab are fitted. Friction force (friction resistance) when the support surface 4f contacts the inner peripheral surface of the core tube 3, and friction force (friction) when the end surface 2a of the master roll 2 contacts the inner walls of the roll flange pairs 4Aa and 4Ab. (Resistance) is reduced and slipping is facilitated, and wear of the insertion support surface 4f and / or the core tube 3 is extremely reduced, so that a stable back tension can always be obtained. Dimensional reproducibility of an image by causing more stable the feed amount of the master 1 could also be more stable by.
[0067]
FIG. 6 shows a modification of the embodiment. In this modification, instead of the Mylar sheet 10 in the above embodiment, the Mylar sheet 10 ′ formed to have the same outer diameter as the end face part 3a of the paper tube 3 is replaced with a sheet attaching part 4g of each roll flange 4Aa, 4Ab. The only difference is that it was affixed to. In FIG. 6, the relief recess 4 d of the roll flange 4 </ b> Aa is illustrated in an end view for clarity with the end surface 2 a of the master roll 2 ′.
[0068]
According to this modification, in addition to the advantages of the above-described embodiment, even if the master roll 2 ′ is wound with the side end of the master 1 protruding from the end surface portion 3 a of the paper tube 3, Since the outer peripheral edge of the Mylar sheet 10 'of the roll flange pair 4Aa, 4Ab does not come into contact with the end surface 2a of the master roll 2', it is possible to make it difficult for the end surface 2a portion of the master roll 2 'to be broken. . Note that the outer diameter of the Mylar sheet 10 ′ may be formed to be slightly smaller than the outer diameter of the paper tube 3 in consideration of variations in dimensional accuracy of the outer diameter of the paper tube 3.
[0069]
If the advantages of the embodiment shown in FIG. 1 to FIG. 5 and the modification shown in FIG. 6 are not desired, the embodiment shown in FIG. 1 to FIG. 5 and the modification shown in FIG. The material of the roll flange pair 4Aa, 4Ab is made the same as that of the conventional example, and the mylar sheet 10 is removed from the roll flange pair 4Aa, 4Ab, that is, both end edges inside the core tube 3 (where burr 3A occurs) A pair of roll flanges (master roll support means) having only a relief groove 4Aj as a relief that avoids contact with the edge portions at both ends may be provided (refer to claim 1).
[0070]
If the advantages shown in the embodiment shown in FIGS. 1 to 5 and the modification shown in FIG. 6 are not desired, the embodiment shown in FIGS. 1 to 5 and the modification shown in FIG. A configuration in which only the mylar sheet 10 is removed from the example roll flange pair 4Aa, 4Ab may be used (see claim 2). In this case, the sheet sticking portion 4g of the roll flange pair 4Aa, 4Ab may be brought into contact with the end surface portion 3a of the paper tube 3 in consideration of the thickness of the mylar sheet 10.
[0071]
If the advantages shown in the embodiment shown in FIGS. 1 to 5 and the modification shown in FIG. 6 are not desired, the embodiment shown in FIGS. 1 to 5 and the modification shown in FIG. Only the material of the example roll flange pair 4Aa, 4Ab may be the same as the conventional example (see claim 3).
[0072]
The embodiments and modifications of the present invention are not limited to the above-described embodiments and modifications. For example, the same embodiments as shown in FIGS. 22 to 31 of Japanese Patent Laid-Open No. 9-226088 are used. The present invention can also be applied to examples and modifications thereof. In other words, the present invention provides a master roll support in which the master abuts on the end surface of the core tube of the master roll wound around the core tube and is fitted into the core tube to rotatably support the master roll. Any plate-making apparatus having a means can be applied to any plate-making apparatus and a plate-making printing apparatus equipped with the plate-making apparatus.
As described above, the present invention has been described with respect to specific embodiments including examples. However, the configuration of the present invention is not limited to the above-described embodiments and modifications, and is configured by appropriately combining them. It will be apparent to those skilled in the art that various embodiments and examples can be made within the scope of the present invention according to the necessity and application thereof.
[0073]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a new plate making apparatus by solving the problems of the conventional apparatus as described above. The effects for each claim are as follows.
According to the first aspect of the present invention, the master roll support means has a relief for avoiding contact with the end edge at a portion facing the inner end edge of the core tube, so that Since the burr generated at the edge and the master roll support means do not come into contact with each other, the variation in back tension (tension) for each master roll (each of the master rolls) can be suppressed to a small level. The variation in back tension can be kept small until the start of use or the end of use of the roll, thereby stabilizing the feed amount of the master and stabilizing the dimensional reproduction accuracy of the image.
[0074]
According to the second aspect of the present invention, the master roll support means is formed of a material that reduces frictional force when coming into contact with the end face of the core tube and / or the master roll and has wear resistance. Thus, it is possible to always obtain a stable back tension, thereby further stabilizing the feed amount of the master, thereby further stabilizing the dimensional reproduction accuracy of the image.
[0075]
According to the invention described in claim 3, since the master roll support means and the end surface portion of the core tube abut via the friction reducing means, in addition to the effect of the invention described in claim 1 or 2, the master roll and the core No abnormal noise is generated when the tube rotates. In addition, the variation in back tension applied to the master drawn from the master roll can be further reduced, thereby further stabilizing the dimensional reproduction accuracy of the image by further stabilizing the master feed amount. can do.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional plan view of a main part around a master holding unit in a plate making apparatus showing an embodiment of the present invention.
FIG. 2 is an enlarged partial cross-sectional plan view showing a main part of FIG. 1;
3 is a perspective view showing the periphery of a roll flange of the master holding unit of FIG. 1. FIG.
4 is a plan view of a main part around the plate making apparatus and the master holding unit of FIG. 1. FIG.
FIG. 5 is a partial cross-sectional front view of an essential part of a stencil printing apparatus provided with a plate making apparatus showing an embodiment of the present invention.
6 is a partial cross-sectional plan view of a main part around a master holding unit in a plate making apparatus showing a modification of the embodiment of FIG. 1; FIG.
FIG. 7 is a partial cross-sectional plan view of a main part for explaining problems around a master holding unit in a conventional plate making apparatus.
8 is an enlarged partial cross-sectional plan view showing the main part of FIG.
[Explanation of symbols]
1 Master
2,2 'master role
2a Master roll end face
3 Paper tube as a core tube
3a End face of paper tube
3A Burrs generated on the end face of the paper tube
4Aa, 4Ab Roll flange pair as master roll support means
4Aj Escape groove as escape
4d relief recess
4f Insertion support surface
5 Guide members
6 Compression spring
10,10 'Mylar sheet as friction reducing means
15A plate making equipment
16A Master holding unit constituting the plate making apparatus
MB master width direction
T Master transfer direction

Claims (3)

Master roll support means for contacting the end face of the core roll of the master roll wound around the core pipe in a roll shape, and being fitted into the core pipe and rotatably supporting the master roll In plate making equipment,
The master roll supporting means has a relief for avoiding contact with the end edge at a portion facing the inner edge of the core tube. The plate making apparatus according to claim 1,
The master roll supporting means is made of a material that reduces frictional force when coming into contact with the core tube and / or the end face of the master roll, and is made of a wear-resistant material. In the plate making apparatus according to claim 1 or 2,
Friction reducing means for reducing a frictional force when the master roll support means and the end face portion of the core tube abut on each other is provided on the master roll support means and / or the end face portion of the core pipe. Plate making equipment.

Images