JP2002103555A - Plate making device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such problems that burrs to be generated on both edge parts of the inside of a paper tube as a core tube vary in size depending upon each of the paper tubes and therefore, the large-sized burr lessens the inside diameter of the paper tube or the inner peripheral part of the paper tube and the fitting-in support part face of a roll flange come into linear contact with each other, resulting in an increase in the scattering range of a friction load with the paper tube and consequently, the friction load scatter per master roll, that is, a back tension to be applied to a master to be drawn from the master roll tends to scatter. SOLUTION: The master 1 comes into contact with the end face part 3a of the paper tube 3 of the master roll 2 wrapped, like a roll, around the paper tube 3 and a pair of the roll flanges 4Aa and 4Ab which are fitted into the paper tube 3 and support the master roll 2 in a freely rotating manner, have an escape groove 4Aj for avoiding contact with the burr 3A generated at the edge parts, at a region opposite to the inner edge parts of the paper tube 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a plate making apparatus,
More specifically, the present invention relates to a plate making apparatus and a support structure for a master roll used therein.

[0002]

2. Description of the Related Art A thermosensitive digital stencil printing machine is known as a simple printing machine. This stencil printing apparatus heats and perforates a thermosensitive stencil master (hereinafter, referred to as a “master”) having a thermoplastic resin film in accordance with image information by a thermal head, and prints the perforated stencil master on a plate cylinder. And ink is supplied from the inside of the plate cylinder. Then, the ink supplied from the inside of the plate cylinder oozes onto 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 a master having been made into a plate, thereby forming the plate. The image is printed by transferring the ink oozing from the perforated portion of the master to the printing paper.

A device for perforating and making a plate on a master by using a thermal head is called a plate making device or a plate making device. As a plate making device, the master is supported so that the master can be fed out from a master roll wound in a roll shape around a core tube, and can be brought into contact with an end surface of the core tube, and is fitted into the core tube to form the master roll. 2. Description of the Related Art There is known a master roll supporting structure having a master roll supporting means for rotatably positioning and supporting a master roll.

[0004] Regarding the support structure of the master roll in such a plate making apparatus, the applicant of the present invention disclosed in Japanese Patent Application Laid-open No. 2000-4.
In Japanese Patent No. 3227, a new technique has been proposed in order to solve the following problems by focusing on the following problems. That is, JP 20
In JP-A-00-43227, when the direct setting method of the master roll is adopted or when the roll flange on the master roll supporting means side does not rotate, abnormal noise is generated or the back tension (tension) of the master is reduced. A support structure for a master roll in an improved plate-making apparatus in which the variation does not increase or the master at the end face of the master roll does not break is proposed.

Hereinafter, in order to clarify the difference from the embodiment described later, referring to FIGS.
The problem of the support structure of the master roll in the plate making apparatus proposed in JP-A-43227 will be described. 7 and 8
1 shows a configuration of a main part similar to a support structure of a master roll in a plate making apparatus described in FIG. 1 of JP-A-2000-43227.

In FIGS. 7 and 8, reference numeral 1 denotes a sheet-shaped master, reference numeral 2 denotes a master roll formed by winding the master 1 in a roll shape, and reference numeral 3 denotes a pipe-shaped core tube. Therefore, when forming the master roll 2, the master 1
Reference numeral 16 denotes a master holding unit.

The master 1 has a light transmittance of 1 to 2 μm.
A laminated structure in which a porous support made of a Japanese paper fiber or a synthetic fiber or a mixture of both materials is attached to a thin thermoplastic resin film is used, and a thermal head or the like as a plate making means is used. Are heated and perforated by the heating element. Paper core 3
Are 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-shaped sheet obliquely to form a long pipe made of paper, and cutting it into a predetermined size.

The master holding unit 16 is in contact with the end faces 3 a of the paper core 3 on both sides of the master roll 2, and
It has a pair of left and right roll flanges 4a and 4b that fit into the inside and rotatably support the master roll 2. The master holding unit 16 includes a plate making insertion position inserted into the main body of the plate making device 15 shown in parentheses in FIG. 5 and a roll attaching / detaching position (detaching / detaching the master roll 2 out of the plate making insertion position). (Not shown), and is slidable in directions F and R shown by arrows in the figure via a guide rail 79 arranged on the main body side of the plate making apparatus 15. Here, the roll attaching / detaching position also includes a position slid outward from a stencil printing apparatus in which the plate making device 15 is built.

In FIG. 7 and FIG. 8, reference symbol T denotes a master transport direction in which the unwound master 1 is transported, and reference symbol MB denotes an axial direction of the master roll 2 which is orthogonal to the master transport direction T (of the core tube 3). (Longitudinal direction) is also shown in the master width direction. The roll flange pair 4a,
4b is shown in parentheses in both figures with reference to FIGS. 4 and 5, and a pair of roll flanges 4A of an embodiment described later.
a, 4Ab. Similarly, the plate making device 15
It is shown in parentheses with reference to FIG. 5 and is distinguished from a plate making apparatus 15A of an embodiment described later. Further, the master holding unit 16 is shown in parentheses in both figures with reference to FIGS. 4 and 5, and is distinguished from a master holding unit 16A of an embodiment described later.

The pair of roll flanges 4a and 4b are arranged on both sides of a roll receiving stand 27 shown in FIGS. 4 and 5. Roll flange pairs 4a and 4b have the same size,
Conical surface portion 4c that can be fitted into paper core 3 of master roll 2
Recess 4d as an escape for avoiding contact with the end face 2a of the master roll 2, and a paper core 3 of the master roll 2.
A fitting support portion surface 4f that loosely fits inside and a sheet attaching portion 4g that attaches a mylar sheet 10 described later are integrally formed.

The outer diameter of the fitting support surface 4f of the pair of roll flanges 4a, 4b is formed slightly smaller than the inner diameter of the paper tube 3. The roll flange pair 4a, 4b is made of a general-purpose plastic such as acrylonitrile butadiene styrene resin (ABS resin) or polystyrene (P
S) or polycarbonate resin (PC).

The frictional force generated when the roll flanges 4a, 4b abut on the end faces 3a of the paper tube 3 is reduced and the frictional force is reduced on the sheet sticking portion 4g of the pair of roll flanges 4a, 4b. A mylar sheet 10 made of PET (polyethylene terephthalate) as a friction reducing means for stabilizing the sheet in a predetermined range is stuck and fixed with an adhesive. The mylar sheet 10 is formed to be slightly larger than the outer diameter of the end face portion 3a of the paper tube 3, and has a substantially ring band shape.

The right roll flange 4b in FIGS. 7 and 8 is provided with the roll receiving stand 2 shown in FIGS. 4 and 5.
7 is fixed to one inner wall. On the other hand, the roll flange 4a on the left side in the figure is fixed to the inner wall of a flange support plate 26, which is a member different from the roll receiving stand 27, and has a master width via a guide member 5 facing and protruding toward the roll flange 4b. It is movable in the direction MB and cannot rotate. The roll flange 4a is provided with an insertion hole 4e having a circular cross section for loosely fitting the guide member 5, and a guide member 5 described later.
And a guide groove 4h having a rectangular cross-section having a function of preventing rotation of the roll flange 4a is loosely fitted into the protrusion 5b, and the entire cross-section is substantially a round hole with a key groove. (See Figure 3).

The guide member 5 is made of a metal such as stainless steel, for example, and has a cross-sectional shape of a substantially keyed round bar. At the right end of the guide member 5, a head 5a for restricting the movement of the roll flange 4a is provided. On the guide member 5, the roll flange 4a is parallel to the master width direction MB, and the fitting support surface 4f on the roll flange 4b side. And roll flange 4
Rectangular projections 5b are formed integrally with each other so as to coaxially slide and guide the fitting support surface 4f on the side a in parallel (see FIG. 3 to be borrowed).

The guide member 5 between the inner wall of the flange support plate 26 and the left end wall of the roll flange 4a has a sheet attaching portion 4g of the roll flange 4a via a mylar sheet 10.
A compression spring 6 is wrapped around the end portion 3a of the paper tube 3 so as to press the end portion 3a. The compression spring 6 acts to press the sheet sticking portion 4 g of the roll flange 4 a to the end surface 3 a of the paper tube 3 via the Mylar sheet 10,
When the master roll 2 rotates in the feeding direction, the paper core 3
A force that generates a predetermined range of frictional force between each end surface portion 3a and each mylar sheet 10 to resist the feeding of the master 1 from the master roll 2, in other words, the master pulled out from the master roll 2. 1 has a function of generating back tension. Thereby, there is an advantage that the slack which tends to occur when the master 1 is fed out can be eliminated.

As described above, the roll flange 4
When the master holding unit 16 occupies the plate making insertion position, the positioning position (borrowed) is capable of abutting on one end surface 3a of the paper tube 3 via the mylar sheet 10 and positioning the master roll 2. 4 and a non-positioning position where the master holding unit 16 occupies the roll attaching / detaching position and is separated from one end surface 3a of the paper tube 3 (a position indicated by a solid line in FIG. 4 to be borrowed). ) Has a function as a roll positioning means that is movable between the rollers.
In FIG. 3 to be borrowed and FIGS. 4 and 7 to be borrowed, the roll positioning guide means 30 is provided with the inclined guide portion 78 of the side plate 78.
a and the slide guide portion 78b, the inclined portion 26a of the flange support plate 26, the slide portion 26b, the protrusion 5b of the guide member 5, the conical surface portion 4c of the roll flange 4Aa, and the guide groove 4.
h and a compression spring 6.

According to the conventional example shown in FIGS. 7 and 8,
The roll flange pairs 4a, 4a,
4b and the compression spring 6, even if the end face 3a of each paper tube 3 and the mylar sheet 10 rotate while being pressed against and pressed against each other, an unusual noise (scraping sound of a key key) as in the related art is generated. Is no longer to be done. Also,
When starting to use the master roll 2 with a large roll diameter,
The difference in the pulling power required to pull out the master 1 from the master roll 2 can be suppressed in a small range between when the roll diameter is small and the end of use, in other words, the variation in the back tension of the master 1 can be reduced. FIG. 4 of the publication
As shown in (a) and (b), it was possible to substantially reduce by half. As a result, the effect of stabilizing the feed amount of the master 1 and stabilizing the dimensional reproduction accuracy of the image has come to be achieved.

[0018]

However, both ends of the master roll 2 on the inner side of the paper tube 3 are provided with the paper tube 3.
When cutting is performed, burrs 3A of various sizes are generated. The cutting of the paper tube 3 is intended to reduce man-hours and costs.
This is done using a circular saw electric cutter with a saw blade. The burr 3A is mainly used for cutting the paper tube 3 when, for example, a circular saw electric cutter (not shown) is moved from the upper portion to the lower portion of the paper tube 3 as shown in an enlarged view in FIG. 1 and 6, which will be referred to later, the rotation of the master roll 2 with respect to the fixed roll flange pair 4a, 4b is considered. Then, for convenience, it is shown to occur over the entire periphery of both end edges inside the paper tube 3.

When there are no burrs 3A at both end portions inside the paper tube 3, the inner peripheral surface of the paper tube 3 and the roll flange pair 4a,
Due to surface contact with the fitting support portion surface 4f in 4b, frictional resistance (friction load) occurs in a relatively small range. However, the burrs 3 </ b> A generated at both inner edges of the paper tube 3 are generated when the paper tube 3 is cut.
(The height of the paper tube 3 from the inner peripheral surface to the center of the paper tube 3 and the length of the paper tube 3 in the longitudinal direction) are different. Large and paper tube 3
Of the paper tube 3 and the inner peripheral portion of the paper tube 3 and the fitting support portion surface 4f are in line contact with each other. The friction load varies, that is, the back tension applied to the master 2 pulled out from the master roll 2 causes variation. In particular, as shown in FIGS. 7 and 8, when only the master roll 2 rotates without the roll flange pair 4a, 4b rotating (fixed), the inner peripheral portion of the paper tube 3 and the fitting support portion surface are rotated. By rotating contact with 4f,
When the inner peripheral portion of the burr 3A generating portion of the paper tube 3 is worn, the back tension varies.

Although it is not difficult to remove the burrs 3A generated on both inner edges of the paper tube 3 by increasing the number of processes and costs, it is called for resource saving and energy saving. In today's situation, it is the best way to reduce man-hours and costs if the stencil printing apparatus that uses hundreds of master rolls is used as a supply. The core tube is not limited to the paper tube 3 described above, but may be an acrylonitrile butadiene styrene resin (ABS).
Some materials are made of synthetic resin such as resin) and polycarbonate resin (PC). However, a core tube made of such a material not only increases the cost but also reduces the burrs at the time of cutting.
The generation of A is inevitable, and even when molding is performed by the injection molding method, the burr 3A occurs due to parting.

Therefore, the present invention has been made in view of the above-mentioned circumstances, and its object is to provide:
When the direct set method of the master roll is adopted or the roll flange (master roll support means) does not rotate, etc., even if burrs are generated on the inner edge of the core tube (paper tube), the master roll is not affected. In addition to minimizing the variation of the back tension (tension) for each roll, the variation of the back tension can be reduced until the start or the end of use of the same master roll, thereby stabilizing the master feed amount. Accordingly, it is an object of the present invention to provide a plate making apparatus capable of stabilizing the dimensional reproduction accuracy of an image. In addition to the above-mentioned object, in addition to forming the material of the roll flange (master roll supporting means) which comes into contact with the core pipe of the master roll, the material is made of a material which reduces frictional resistance, is slippery, and has high wear resistance. Accordingly, it is an object of the present invention to provide a plate making apparatus which can always obtain a stable back tension and thereby further stabilize the feed amount of the master, thereby further stabilizing the dimensional reproduction accuracy of an image. Further, in addition to the above objects, by causing the master roll supporting means and the end face of the core tube to abut via the friction reducing means, the generation of abnormal noise caused by the rotation of the master roll and the core tube is reduced. It is another object of the present invention to provide a plate making apparatus capable of preventing the occurrence of a back tension and constantly stabilizing the feed amount of the master, thereby further stabilizing the dimensional reproduction accuracy of the image.

[0022]

Means for Solving the Problems In order to solve the above-mentioned problems and to achieve the above object, the invention described in each claim has the following characteristic structure. The invention according to claim 1 is such that the master abuts on the end face of the core tube of a master roll wound in a roll shape around the core tube, and is fitted into the core tube so that the master roll is rotatable. In the plate-making apparatus having a master roll supporting means for supporting, the master roll supporting means has a relief for avoiding contact with the edge at a portion facing an inner edge of the core tube. And Here, the “end surface portion of the core tube” refers to a portion of the end surface itself of the core tube, and is shown in FIGS. 1, 2, 6, 6, 7, and 8 to be referred to in embodiments described later. As described above, this means that the portion of the burr generated on the edge of the core tube on the end surface side of the core tube is also included.

According to a second aspect of the present invention, in the plate making apparatus according to the first aspect, the master roll supporting means reduces a frictional force when coming into contact with the core tube and / or the end face of the master roll. , Made of a material having wear resistance. Here, the portion where the master roll supporting means contacts the core tube includes the inner peripheral surface of the core tube and the end surface of the core tube.

The invention according to claim 3 is the invention according to claim 1 or 2
In the plate making apparatus described above, friction reducing means for reducing a frictional force when the master roll supporting means and the end face of the core tube come into contact with each other is provided on the master roll supporting means and / or the end face of the core pipe. It is characterized by having been provided. Here, the position of the friction reducing means may be provided on the end face of the master roll support means and / or the core pipe as described above, but may be provided on the end face of the master roll support means and the core pipe, When provided on the end face of the core tube, the master roll is a supply and must be provided for each one, which is disadvantageous in cost. Therefore, the position of the friction reducing means is determined based on the durability of the friction reducing means depending on the position of the friction reducing means, the stabilization of the frictional force for keeping the frictional force within a predetermined range, and the economical efficiency. It is preferably provided at the roll supporting means, that is, at a portion which comes into contact with the end face of the core tube on the master roll supporting 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 or slightly smaller than the outer diameter of the end face of the core tube, and to be substantially ring-shaped. Further, a sheet-like material is preferable.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention including embodiments with reference to the drawings (hereinafter, simply referred to as "embodiments").
Will be described. In the conventional examples and embodiments shown in FIGS. 7 and 8, members having the same functions, shapes, and the like are designated by the same reference numerals, and description thereof will be omitted as much as possible. For the sake of simplicity of the drawings and the description, even if they are components to be shown in the drawings, components that do not need to be specifically described in the drawings may be appropriately omitted without omission. In the drawings, components that are configured as a pair and do not need to be specifically distinguished and described will be replaced with the description by appropriately describing one of them in order to simplify the description.

FIGS. 1 to 5 show an embodiment of a plate making apparatus according to the present invention. This embodiment is different from the plate making apparatus 15 shown in FIG. 3 of JP-A-2000-43227 described in the conventional example in that the master holding unit 16 shown in FIGS. Instead of
The only difference is that a plate making device 15A having a master holding unit 16A is provided. Note that Japanese Patent Application Laid-Open No. 2000-4322
The embodiment described in Japanese Patent Application Publication No. 7-210 is compared with the previous conventional example shown in FIG. 1 and FIG. Making apparatus 20 having master holding unit 21
Instead of the master making unit 16 having the master holding unit 16
5 with the only difference being that

First, with reference to FIG. 5, the configuration of a main part of a stencil printing apparatus as a printing apparatus to which the plate making apparatus 15A is applied will be briefly described. The stencil printing machine shown in FIG. 5 includes a clamper 1 that clamps and holds the leading end of the master 1 that has been made.
A stencil printing process unit in which a plate cylinder 14 provided with a stencil 3 is provided, and a sheet feeding device, a plate discharging unit,
It is mainly composed of a paper discharge unit and the above-described plate making device 15A. In the stencil printing machine, the stencil making machine 15A has a novel configuration according to the present invention.
It has a configuration similar to that shown in FIGS. 1 and 2 of JP 26088.

The plate making device 15A includes the master holding unit 16A, the platen pressure control unit 55, and the cutting unit 70.
The configuration around the platen pressure control unit 55 and the cutting unit 70 other than the master holding unit 16A is shown in FIGS. 1 and 2 of JP-A-9-226088, Since it has the same configuration as that shown in FIG. 3 of Japanese Unexamined Patent Publication No. 2000-43227, the main component names and their functions will be simply described in order to avoid redundant description. In FIG.
Reference numeral 51 denotes a guide member, reference numeral 56 denotes a thermal head, reference numeral 57 denotes a head base, reference numeral 65 denotes a platen roller, reference numeral 71 denotes a rotary cutter, and reference numeral 72 denotes a first cutter.
Reference numeral 74 denotes a second conveying roller pair, and reference numeral 74 denotes a second conveying roller pair.

The guide member 51 is provided on the master transport 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 the master holding unit 16A moves the plate making insertion position shown in FIG. When it is occupied, it has a function as a master introducing means for positioning and introducing the tip of the master 1 conveyed by the pull-out roller 40 by engaging with the guide plate 35 near 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 of the heating elements. Accordingly, the master 1 has a well-known function as a plate making means for heating and melting a portion of the master 1 corresponding to the heat generation position to make a hole. Thereby, the thermal head 56
Is pulled out from the master roll 2 and is pulled out from the pull-out roller 40.
Heating and punching are selectively performed on the master 1 conveyed by the rotation of. The thermal head 56 is controlled by a platen roller 6 by a platen pressure control means, the description of which is omitted here.
5 is freely movable.

The platen roller 65 is connected to the pull-out roller 4.
The unprinted master 1 conveyed by the rotation of 0 or the prepressed master 1 heated and perforated by the thermal head 56 rotates while being pressed between the thermal head 56 and is conveyed to the downstream side of the master conveyance path MR. It has a well-known function. The platen roller 65 is made of, for example, silicon rubber or the like, and has a friction coefficient larger than that of the pull-out roller 40 with respect to the master 1. The platen roller 65 is rotationally driven via a driving force transmission mechanism (not shown) for transmitting the rotational driving force of a driving motor (not shown), the description of which is omitted here, to the platen roller 65.

The head base 57 is swingably supported by the base shaft supported by both side plates 78 shown in FIG. 4 and inserted into base shaft holes formed on both side walls thereof. The head base 57 and the guide mounting portion have a function of a swingable member that supports the thermal head 56 in a swingable manner.

The rotary cutter 71 includes a platen roller 6.
5 has a function as a cutting means for cutting the rear end of the master 1 having been made or the master 1 which is not made. In the master width direction MB near the rotary cutter 71 arrangement portion, the rotary cutter 71 is moved in the master width direction M.
A guide rail for reciprocating guidance at B is arranged. The rotary cutter 71 has a known configuration that can move in the master width direction MB while rotating. The rotary cutter 71 rotates and crosses the master transport path MR only when cutting the rear end of the master 1 on which the master 1 has been made or the master 1 which has not made the master. Usually, the guide rail in the master width direction MB is used. Are arranged at one end so that the transfer of the master 1 is not hindered. The rotary cutter 71 is rotated and moved by a cutter driving motor (not shown). The rotary cutter 71 and the cutting portion 70 provided with the guide rail have a known configuration similar to that of, for example, FIG. 1 of JP-A-7-101135.

Roller 72 above first transport roller pair 72
Is a drive roller formed integrally with the shaft, and the lower roller 72 is a driven roller formed integrally with the shaft. (Shown) is rotatably supported. The rotational drive force of the drive motor is transmitted to the upper roller 72 via a first rotational force transmission mechanism that transmits the rotational drive force of the drive motor as a master transport drive unit 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 rotatably supported between the two side plates 78. The rotational driving force of the drive motor is transmitted to the upper roller 74 via a second rotational force transmission mechanism that transmits the rotational drive force of the drive 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.
Each is preset to rotate at a peripheral speed slightly higher than the peripheral speed of the platen roller 65 via the first rotational force transmission mechanism.

On the main body side of the plate making apparatus 15A, a pair of left and right sheet metal side plates 78 are arranged in parallel with each other. As shown in FIGS. 4 and 5, the lower portions of the both side plates 78 are engaged with the respective slide rails 27c of the roll receiving table 27, so that the master holding unit 16A is moved between the plate making insertion position and the roll attaching / detaching position. A pair of left and right guide rails 79 is formed as guide means for slidably guiding the rails. These guide rails 79 are adapted to engage with the respective slide rails 27c at channel-shaped portions opened inward.

As shown in FIGS. 1 to 5, the master holding unit 16A is a master holding unit 16A shown in FIGS. 1 to 3 of JP-A-2000-43227.
In comparison with the above, instead of the pair of left and right roll flanges 4a and 4b provided on the master holding unit 16,
The main difference lies in having a pair of left and right roll flanges 4Aa and 4Ab. The master holding unit 16A includes a roll receiver 27, a pair of left and right roll flanges 4Aa,
4Ab, a guide plate 35 and a pull-out roller 40. Except for the configuration around the roll flange pair 4Aa and 4Ab, the configuration of the roll holding table 27, the guide plate 35, and the master holding unit 16A around the pull-out roller 40 are described in FIGS.
Because it has a configuration similar to that shown in
In order to avoid repetition, only their configurations and functions will be briefly described. Hereinafter, while supplementing the contents not described in the conventional example shown in FIGS. 7 and 8, first, the same configuration as 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 described in JP-A-9-22608.
The arrangement shown in FIG.

As shown in FIGS. 4 and 5, the roll receiving table 27 has a substantially housing shape and is integrally formed of a synthetic resin. Above the roll receiving stand 27, an opening having a slightly wide frontage is formed in order to improve workability when the master roll 2 is attached and detached. A letter-shaped storage section 27e is formed.

At the approximate center of the bottom wall of the roll receiving stand 27, an opening 27d for opening a master detecting means to be described later when the master holding unit 16A occupies the plate making insertion position is opened. A handle 27b is integrally attached to the center of the rear outer wall of the roll receiver 27. This handle 27
The master holding unit 16A can be moved to the plate making insertion position shown in FIG. Can be selectively moved to the roll attaching / detaching position shown in FIG. At the lower part of both side walls of the roll receiving stand 27, a slide rail 2 having a channel shape having a cross section opened upward is provided.
7c are integrally formed, and the slide rail 27c is appropriately reinforced by sheet metal.

As shown in FIG. 4, a pair of left and right sheet metal side plates 78 (only the left side is shown in FIG. 4) is provided on the main body side (hereinafter sometimes simply referred to as "apparatus main body side") of the plate making apparatus 15A. Are arranged parallel to each other. As shown in FIG. 5, the master holding unit 16 </ b> A slides between the plate making insertion position and the roll attaching / detaching position by engaging with the respective slide rails 27 c of the roll receiving stand 27 at the lower portions of these both side plates 78. A pair of left and right guide rails 79 is formed as guide means for guiding freely. These guide rails 79 are adapted to engage with the respective slide rails 27c at channel-shaped portions opened inward. In FIG. 5, reference numeral MR indicates a master transport path for transporting the master 1 unwound from the master roll 2. The left side plate 78 in FIG. 4 on the apparatus main body side has an inclined guide portion 78a formed by bending the rear end outward, and a right side plate 78 (omitted in FIG. 4) in FIG. And a slide guide portion 78b formed in parallel.

The flange support plate 26 is made of sheet metal.
The flange support plate 26 is, as shown in FIG.
Of the side plate 78 are formed in parallel with the slide guide portion 78b of the side plate 78 and the guide member 5 is attached to the inner wall thereof.

In FIG. 4, the left roll flange 4A is shown.
“a” is fixed to the inner wall of the flange support plate 26 which is a member different from the roll receiving stand 27. In FIG. 4, the right roll flange 4Ab is fixed to an inner wall on one side of the roll receiver 27. When the master holding unit 16A occupies the stencil insertion position, the roll flange 4Aa holds the end face 3 of the core tube 3 of the master roll 2 via the mylar sheet 10.
a and the master holding unit 16A occupies the roll attachment / detachment position (position indicated by a phantom line in FIG. 4), which is capable of abutting on the end surface 3a of one core tube 3 of the master roll 2. At this time, one core tube 3 of the master roll 2
Has a function as a roll positioning means movable between a non-positioning position (a position indicated by a solid line in FIG. 4) separated from the end face portion 3a.

In FIG. 4, reference numeral 30 denotes a roll positioning guide means. The roll positioning guide means 30 has a function of movably guiding the roll flange 4Aa as a roll positioning means between a positioning position and a non-positioning position. The roll positioning / guiding means 30 is shown in FIG.
3 and 4, the inclined guide portion 78a of the side plate 78 is shown.
And the slide guide portion 78b, the inclined portion 26a of the flange support plate 26, the slide portion 26b, and the protrusion 5 of the guide member 5.
b, conical surface portion 4c of roll flange 4Aa, guide groove 4h
And a compression spring 6.

In FIG. 4, the roll positioning and guiding means 30 is provided not only on the left side of the roll positioning and guiding means 30 but also on the left side of the roll flange 4Ab. Roll flange 4Aa movably between position
Of course, it may be configured in the same manner as described above.

As shown in FIG. 4, a pair of guide plate support portions 27f formed integrally with the roll receiving stand 27 are formed at the left and right ends of the front upper portion of the roll receiving stand 27, respectively. The pair of guide plate support portions 27f include:
A guide plate 35 as master guide means for mounting the leading end of the master 1 unwound from the master roll 2 is arranged swingably. The guide plate 35 has a substantially rectangular shape in plan view, and is made of sheet metal. The base end 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. Guide plate 3
The free end side of 5 has a downward swing range regulated by a stopper (not shown) formed integrally with the guide plate support portion 27f, and can swing freely by its own weight of the guide plate 35.

Two stepped pins 29 are planted at predetermined intervals in the vertical direction on the lower outer wall of each guide plate support portion 27f of the roll receiving stand 27. An elongated plate-like roller arm 43 is disposed above the guide plate 35 and over the lower outer walls on both sides of the roll receiver 27. In the lower part on both sides of the roller arm 43, vertically long guide grooves 43b are formed, and two stepped pins 29 are loosely fitted in these guide grooves 43b, respectively. The roller arm 43 is made of sheet metal, and a handle portion 43a is formed at an upper portion of the roller arm 43 by bending upward at a right angle. Therefore, the roller arm 43 is supported and guided by the two stepped pins 29 so as to be able to move up and down within the range of the pair of left and right guide grooves 43b.

The upper end of the roller arm 43 contacts the guide plate 35 via the leading end of the master 1 to contact the master 1.
Roller 40 as a master transport unit for transporting
Are arranged. The pull-out roller 40 has a roller shaft 4
1 and is rotatably supported between both upper portions of the roller arm 43 via a roller shaft 41. In FIG. 4, the roller shaft 41 on the right side protrudes from the upper part of the roller arm 43, and a roller gear 42 is fixed to an end of the roller shaft 41. The pull-out roller 40 is a sponge-shaped roller made of, for example, foamed chloroprene rubber or foamed polyurethane.

As described above, the pull-out roller 40
Due to the respective weights of the roller arm 43 and the pull-out roller 40, on the upper surface of the guide plate 35 while interlocking with the above-mentioned swinging operation of the guide plate 35 through the above-mentioned supporting and guiding operation of the stepped pin 29 and the guide groove 43b. In contact. 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 roller arm 43 by holding the handle 43a of the roller arm 43. And pulling out the leading end of the master 1 from the master roll 2 while lifting the drawer roller 40 upward,
The tip of the master 1 can be placed on the upper surface of the guide plate 35. Therefore, when the master holding unit 16 </ b> A occupies the roll attaching / detaching position, the drawer roller 40 is configured to be able to contact and separate from the guide plate 35. The pull-out roller 40 is driven by a roller gear 42,
The drive motor 45 and the drive force transmission mechanism as master transport drive means similar to those shown in FIG.

4 and 5, reference numeral 32 denotes a master detection sensor. The master detection sensor 32 is installed at the center of a non-illustrated immovable member bridged between a pair of guide rails 79. The master detection sensor 32
This is a known reflection type optical sensor including a light emitting unit and a light receiving unit. The master detection sensor 32 can detect reflected light obtained when the master roll 2 is loaded in the storage section 27e of the master holding unit 16A. When the master roll 23 is located in the storage section 27e of the master holding unit 16A, the presence of the master roll 23 is detected by the master detection sensor 32. In FIG. 5, reference numeral 33 denotes 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 device 15A and occupies the plate making insertion position. In this embodiment, the master set detection sensor 33 is provided on a lower wall of the guide rail 79 on the apparatus main body side.
Only when the master holding unit 16A occupies the plate making insertion position is a microswitch that engages with the lower end wall of the slide rail 27c. The master set detection sensor 33 detects that the master holding unit 16A has been pushed to the plate making insertion position, and
The operation start timing of the drive motor for rotating the motor and the like is detected, and the detection signal is output to a control unit (not shown).

The master holding unit 16A is provided with the plate making device 1
5A and the master roll 2 which is out of the plate making insertion position (the position shown in FIG. 5).
4 can be slid in the directions indicated by arrows F and R via the guide rails 79 between a roll attaching / detaching position for attaching / detaching the roller (a position further pulled down from the position shown in FIG. 4). ing. Here, the roll attaching / detaching position refers to the plate making device 15.
The position slid outward from the stencil printing apparatus containing A is also included.

The master holding unit 16A is in contact with the end face 3a of the paper core 3 of the same master roll 2 as shown in FIGS. 7 and 8, and is fitted into the paper core 3 to rotate the master roll 2. And a pair of left and right roll flanges 4Aa and 4Ab as master roll support means for supporting the roll flanges.

The roll flange pairs 4Aa and 4Ab of the master holding unit 16A are, as shown in FIGS.
Conventional master holding unit 1 shown in FIGS. 7 and 8
6 compared to the roll flange pair 4a, 4b.
Are provided with escape grooves 4Aj as escapes for avoiding contact with the both end portions at portions opposed to both inside edge portions (occurrence sites of burrs 3A) of the inside of, and are formed of general-purpose plastic ( For example, acrylonitrile butadiene styrene resin (ABS resin), polystyrene (P
S) or polycarbonate resin (PC)) In place of the material (material) of the pair of roll flanges 4a and 4b, the frictional force at the time of contact with the inner peripheral surface of the core tube 3 is reduced, and the material has wear resistance. The main difference is that they are made of a material (material).

The burrs 3 generated on both inner edges of the paper tube 3
A is a height from the inner peripheral surface of the paper tube 3 toward the center of the paper tube 3, for example, 0.2 to 1.5 mm, although it depends on a difference in cutting tools and cutting conditions. There are various sizes in the longitudinal direction, for example, 0.2 to 2 mm, and the variation is large. Therefore, the size of the clearance groove 4Aj formed in the pair of roll flanges 4a and 4b is determined by the size of the large and small burrs 3 generated at the inner edges of the paper tube 3.
A is sufficient if it is formed so as not to come into contact with A. The height from the inner peripheral surface of the paper tube 3 toward the center of the paper tube 3, for example, 2 mm
The length of the paper tube 3 in the longitudinal direction is, for example, about 3 mm and a rectangular cross section.

The pair of roll flanges 4Aa and 4Ab reduce the frictional force (frictional resistance) when coming into contact with the inner peripheral surface of the core tube 3 and, as a material having wear resistance, for example,
Sliding acrylonitrile butadiene styrene resin (AB
S resin) and slidable polyacetal resin (PO
M).

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. That is, the roll flange pair 4Aa, 4Ab
A conical surface portion 4c of the same size, which can be fitted into the paper tube 3 of the master roll 2, an escape recess 4d as an escape for avoiding contact with the end surface 2a of the master roll 2, and a paper of the master roll 2 Fitting support surface 4f loosely fitted into tube 3
And a sheet sticking portion 4g for sticking a mylar sheet 10 described later are integrally formed.

The conical surface portion 4c has a truncated conical shape,
Has a ring-shaped groove shape, and the fitting support portion surface 4f has a columnar shape. The outer diameter of the fitting support surface 4f of the roll flange pair 4Aa, 4Ab is formed slightly smaller than the inner diameter of the paper tube 3. The fitting support surface 4f of the pair of roll flanges 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, thereby adhering the sheet of the pair of roll flanges 4Aa, 4Ab. 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 abutting the end surface portion 3a of the paper core 3 via the mylar sheet 10. Have. The conical surface portion 4c of the pair of roll flanges 4Aa and 4Ab has a function of guiding the core tubes 3 on both sides of the master roll 2 to the three-dimensional positioning position of the master roll 2 in a self-centering manner.

The sheet sticking portion 4g of the pair of roll flanges 4Aa, 4Ab reduces the frictional force when the roll flanges 4Aa, 4Ab abut on the respective end surfaces 3a of the paper tube 3, and reduces the frictional force. A PET (polyethylene terephthalate) sheet 10 as a friction reducing means for stabilizing the sheet in a predetermined range is stuck and fixed with an adhesive. The mylar sheet 10 is formed to be slightly larger than the outer diameter of the end face portion 3a of the paper tube 3, and has a substantially ring band shape.

The mylar sheet 10 has a thickness of 0.0
Those having a size of about 5 to 0.3 mm are used. The thickness of the mylar sheet 10 is somewhat exaggerated in each figure. Mylar sheet 10 has high surface smoothness and
The paper tube 3 is made of a material having a small coefficient of friction that is easy to slip on the surface state of the end face portion 3a. The position of the Mylar sheet 10 is such that the Mylar sheet 10 is rolled to the roll flange 4A in view of its durability, stabilization of frictional force, and economy.
a and 4Ab are adhered to the respective sheet adhering portions 4g.

The friction reducing means is not limited to the Mylar sheet 10 but may be any having the above-mentioned functions. For example, a Teflon tape (trade name), an ultra tape (trade name), or the Teflon tape or The surface of the ultra tape may be coated with a metal foil or powder such as aluminum.

The thermoplastic resin film of the master 1 is made of, for example, polyester or the like. The thickness of the master 1 is about 1/2 of the thickness of a conventionally used master of 40 to 60 μm, and in this embodiment, it is 3 to 30 μm.
m can be used. Therefore, the outer diameter of the master roll 2 is extremely small and compact as compared with the conventional one, contributing to the miniaturization of the apparatus. Also, since the thickness of the master 1 can be very thin compared to the thickness of the conventional master, the image quality can be improved by reducing the so-called fibrous grain, and the high-speed plate making can be achieved by shortening the time of heat perforation. Is possible. Also, the master roll 2 is provided in Japanese Patent Application Laid-Open No. 9-22 / 1990.
A low reflectance portion (not shown) similar to that disclosed in FIG.

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 attached to the end surface 3a of the paper tube 3 via the mylar sheet 10. A compression spring 6 that urges in a pressing direction is wound. The compression spring 6 acts to press the sheet sticking part 4g of the roll flange 4Aa through the Mylar sheet 10 against the end face part 3a of the paper tube 3, so that when the master roll 2 rotates in the feeding direction,
A force that generates a predetermined range of frictional force between each end surface 3a of the paper core 3 and each mylar sheet 10 to resist the unwinding of the master 1 from the master roll 2, in other words, from the master roll 2. It has a function of causing a back tension (tension) in the master 1 to be pulled out. This allows
There is an advantage that slack that easily occurs when the master 1 is extended can be eliminated.

Next, after the master roll 2 is attached and detached,
The operation until the master 1 is wound around the roll positioning guide means 30 is only partially different from the operation according to the difference in the partial configuration of the roll positioning guide means 30, and the operation disclosed in Japanese Patent Application Laid-Open No. 9-2226088. Since the operation is basically the same as that described above, only the different operation will be described, and the other operation description will be omitted.

With the master holding unit 16A occupying the plate making insertion position as shown in FIG.
When the remaining amount of the master 1 is exhausted or the master roll 2 itself does not exist, the lock state of the master holding unit 16A is released by operating the handle 27b of the roll receiving stand 27 by the operator, and the master holding is performed. When the unit 16A is pulled out in the arrow direction R outside the plate making device 15A, the roll receiving table 27
Slide rail 27c is the guide rail 79 of the side plate 78.
While sliding inside, the master holding unit 16A occupies the roll attaching / detaching position.

The pull-out amount for the master holding unit 16A to occupy the roll attaching / detaching position can be adjusted so that the master roll 2 can be attached / detached, and at least the operator can see the pull-out roller 40 and the roller arm 43 can be seen.
Handle portion 43a can be operated. Since the platen pressure applied to the master roll 2 by the platen pressure control unit 55 has been released, the master roll 2 does not receive resistance when the plate making device 15A is pulled out. In FIG. 4, under the urging force of the compression spring 6, the slide portion 26 b of the flange support plate 26 slidably contacting the slide guide portion 78 b of the side plate 78 is
When the master holding unit 16A is moved in the arrow direction R, the engagement with the slide guide 78b is released,
Next, the inclined guide portion 78a of the side plate 78 and the flange support plate 2
6 is engaged and slidably contacted with the inclined portion 26a. Thereby, the conical surface portion 4c of the roll flange 4Aa enters and fits in the paper tube 3 on the left side of the master roll 2 as shown in FIG.
From the positioning position indicated by the imaginary line to the non-positioning position indicated by the solid line retracted from the inside of the paper core 3 on the left side of the master roll 2, and the fitted / engaged state between the master roll 2 and the roll flange 4Aa is released. You.

Then, with the master holding unit 16A occupying the roll attaching / detaching position, the operator removes the used master roll 2 from the storage section 27e of the roll receiving stand 27, and then removes the unused new master roll 2. Prepare and fit the conical surface 4c of the roll flange 4Ab 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 and
Hold the handle 43a of the roller arm 43, lift the roller arm 43 and the pull-out roller 40 upward, place the leading end of the master 1 on the guide plate 35, and then move the roller arm 43 and the pull-out roller 40 downward. Return to the position shown in. That is, the operator places the drawer roller 40 on the guide plate 35 on which the leading end of the master 1 is placed, and the weight of the roller arm 43 and the drawer roller 40 causes the drawer roller 40 to move between the guide plate 35 and the drawer roller 40.
And the front end of the master 1 is clamped between them.

Next, the operator operates the handle 27b of the roll receiver 27 to remove the master holding unit 16A from the roll holder 27.
The compression spring 6 is pushed in the arrow direction F toward the inside of the plate making device 15A against the urging force of the compression spring 6. By this operation, the plate making device 15
An operation opposite to the above-described operation of pulling out from inside A in the arrow direction R is performed. That is, the slide rail 27c of the roll receiving base 27 slides in 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 The state of engagement / sliding contact with the inclined portion 26a of the flange support plate 26 is shifted to the state of engagement / sliding contact between the slide guide portion 78b and the slide portion 26b. Then, the master holding unit 16A
4 and 5, the roll flange 4Aa is displaced from the non-positioning position to the positioning position in parallel with the operation of occupying the plate making insertion position. 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 is connected to the master roll 2 via the mylar sheet 10. 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, is automatically centered, and the roll flange pair 4Aa,
4Ab rotatably supported by the master holding unit 1
6A. Thus, the attachment and detachment of the master roll 2 can be performed by a simple one-touch operation.

The master holding unit 1 of the present embodiment
In the state where the master roll 2 is set and loaded on the pair of roll flanges 4Aa and 4Ab in 6A, Japanese Patent Laid-Open No. 2000-4
In the same manner as shown in FIG. 4A of Japanese Patent No. 3227, the pulling power required to pull out the master 1 from the master roll 2, that is, when the master roll 2 having a large roll diameter starts to be used, and when the roll diameter The variation of the back tension (tension) of the master 1 was measured with respect to the number n of the test specimens at the end of use of the master 1. In the measurement result of the back tension (tension: BT) in the present embodiment, the minimum value BT to the maximum value BT = 3.234N to 3.92.
0N (330 gf to 400 gf, the difference of which is 0.686 N
(70 gf)). This result and Japanese Patent Application Laid-Open
No. 43227, the measurement results shown in FIG. 4B (minimum value BT to maximum value BT = 2.842 N to 4.116)
Comparing with N (290 gf to 420 gf), it was found that the back tension in the present embodiment was smaller than the conventional example in both the width and range of the variation, indicating that the back tension was sufficiently effective.

As described above, according to the present embodiment,
The same advantages as in the conventional example can be obtained, and the burrs 3A generated at the respective inner edges of the paper tube 3 and the roll flange pairs 4Aa and 4Ab are in contact with each other by the relief grooves 4Aj provided in the roll flange pairs 4Aa and 4Ab. Therefore, the variation in the back tension of each of the master rolls 2 can be reduced, and the variation in the back tension can be reduced until the start or the end of use of the same master roll 2. As a result, the feed amount of the master 1 was stabilized, and the dimensional reproduction accuracy of the image was also stabilized. Further, when the pair of roll flanges 4Aa, 4Ab is in contact with the inner peripheral surface of the core tube 3, or when the end surface 2a of the master 1 wound on the master roll 2 is formed.
Even if the end face 2a of the master roll 2 comes into contact with the inner side walls of the pair of roll flanges 4Aa and 4Ab due to the variation in the positions of
And the frictional force (friction resistance) when the fitting support surface 4f of the roll flange pair 4Aa, 4Ab comes into contact with the inner peripheral surface of the core tube 3 and the master The frictional force (frictional resistance) when the end face 2a of the roll 2 and the inner wall of the pair of roll flanges 4Aa, 4Ab come into contact with each other is reduced to make it slippery, and the fitting support surface 4f and / or the core tube 3 are worn. Since it is extremely small, a stable back tension can always be obtained, and thus the dimensional reproduction accuracy of the image can be further stabilized by further stabilizing the feed amount of the master 1.

FIG. 6 shows a modification of the above embodiment. This modification is a modification of the mylar sheet 10 of the embodiment.
Instead, the mylar sheet 10 ′ having the same outer diameter as the end face portion 3 a of the paper tube 3 is attached to each roll flange 4 A.
a and 4Ab only differ in that they are attached to the sheet attaching portion 4g. In FIG. 6, the relief recess 4d of the roll flange 4Aa is drawn in an end view for clarity with the end surface 2a of the master roll 2 '.

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 face portion 3 a of the paper tube 3, the protruding portion is also formed. The outer peripheral edge of the mylar sheet 10 'of the pair of roll flanges 4Aa, 4Ab does not contact the end face 2a of the master roll 2' in the bent portion, so that the end face 2a of the master roll 2 'is less likely to be broken. be able to. The outer diameter of the mylar sheet 10 ′ may be formed slightly smaller than the outer diameter of the paper tube 3 in consideration of variations in the dimensional accuracy of the outer diameter of the paper tube 3.

If the advantages of the embodiment shown in FIGS. 1 to 5 and the modification shown in FIG. 6 need not be desired,
The configuration in which the material of the pair of roll flanges 4Aa and 4Ab of the embodiment shown in FIGS. 1 to 5 and the modification shown in FIG. 6 is the same as that of the conventional example, and the mylar sheet 10 is removed from the pair of roll flanges 4Aa and 4Ab. That is, the core tube 3
A pair of roll flanges (master roll support means) having only a relief groove 4Aj as a relief for avoiding contact with the both end edges at portions opposed to both end edges (sites where the burrs 3A are generated) on the inside. (See claim 1).

If the advantages of the embodiment shown in FIGS. 1 to 5 and the modification shown in FIG. 6 need not be desired, the embodiment shown in FIGS. 1 to 5 and FIG. A configuration in which only the mylar sheet 10 is removed from the pair of roll flanges 4Aa and 4Ab of the modification shown (see claim 2). In this case, the roll flange pair 4Aa, 4Ab
The sheet sticking portion 4g 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.

If the advantages of the embodiment shown in FIGS. 1 to 5 and the modification shown in FIG. 6 need not be desired, the embodiment shown in FIGS. 1 to 5 and FIG. Only the material of the pair of roll flanges 4Aa and 4Ab of the modification shown may be the same as that of the conventional example (see claim 3).

The embodiments and the modifications of the present invention are not limited to the above-described embodiments and the modifications.
The present invention can also be applied to the same embodiments and modifications thereof as shown in FIGS. In other words, the present invention provides a master roll support in which a master abuts on an end surface of a core tube of a master roll wound in a roll shape around a core tube, and is fitted into the core tube to rotatably support the master roll. The present invention can be applied to any plate making apparatus or a plate making / printing apparatus having the plate making apparatus as long as it has a means. As described above, the present invention has been described with respect to the specific embodiments and the like including the examples. However, the configuration of the present invention is not limited to the above-described embodiments and modified examples, and may be configured by appropriately combining these. It will be apparent to those skilled in the art that various embodiments and examples can be configured within the scope of the present invention according to the necessity and use thereof.

[0073]

As described above, according to the present invention, it is possible to solve the above-mentioned problems of the conventional apparatus and to provide a new plate making apparatus. The effects of each claim are as follows. According to the first aspect of the present invention, the master roll supporting means has a relief for avoiding contact with the edge at a portion facing the inner edge of the core tube, so that the inner portion of the core tube can be prevented. Since the burrs generated at the edges do not come into contact with the master roll supporting means, the variation in the back tension (tension) of each master roll (one by one of the master rolls) can be suppressed, as well as the same master roll. Until the use of the roll starts or ends, the variation in the back tension can be suppressed to a small value. As a result, the dimensional reproduction accuracy of the image can be stabilized by stabilizing the feed amount of the master.

According to the second aspect of the present invention, the master roll supporting means is made of a material having a reduced frictional force when coming into contact with the end face of the core tube and / or the master roll, and having wear resistance. As a result, a stable back tension can always be obtained, whereby the master feed amount can be further stabilized, so that the dimensional reproduction accuracy of the image can be further stabilized.

According to the third aspect of the present invention, the master roll supporting means and the end face of the core tube are in contact with each other via the friction reducing means. No noise is generated due to the rotation of the roll and the core tube. In addition, variations in back tension (tension) applied to the master pulled out from the master roll can be further reduced, and the feed amount of the master is further stabilized, so that the dimensional reproduction accuracy of the image is further stabilized. 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 according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional plan view showing a main part of FIG. 1 in an enlarged manner.

FIG. 3 is a perspective view showing a 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. 5 is a partial sectional front view of a main part of a stencil printing machine provided with a stencil making machine according to an embodiment of the present invention.

FIG. 6 is a partial 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. 7 is a partial cross-sectional plan view of a main part explaining a problem around a master holding unit in a conventional plate making apparatus.

FIG. 8 is a partial cross-sectional plan view showing a main part of FIG. 7 in an enlarged manner.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Master 2, 2 'Master roll 2a End face of master roll 3 Paper tube as a core tube 3a End surface of a paper tube 3A Burr generated at the end surface of a paper tube 4Aa, 4Ab Roll flange pair 4Aj as master roll support means Escape Relief groove 4d relief recess 4f insertion support surface 5 guide member 6 compression spring 10, 10 'mylar sheet 15A as a friction reducing means plate making device 16A master holding unit constituting plate making device MB master width direction T master transport direction

Claims (3)

[Claims] 1. A master roll in which a master abuts on an end face of a core roll of a master roll wound in a roll shape around a core pipe, and is fitted into the core pipe to rotatably support the master roll. In a plate making apparatus having roll supporting means, wherein the master roll supporting means has a relief at a portion facing an inner edge portion of the core tube to avoid contact with the edge portion. apparatus. 2. The plate making apparatus according to claim 1, wherein said master roll supporting means reduces frictional force when coming into contact with said core tube and / or an end face of said master roll, and has wear resistance. A plate making device characterized by being formed of a material. 3. A plate making apparatus according to claim 1, wherein said master roll supporting means and friction reducing means for reducing a frictional force when said end face portion of said core tube comes into contact with said master roll supporting means. And / or a plate making device provided on the end surface of the core tube.