JP2005254568A - Printing equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide printing equipment which prevents outflow of confidential information on a master. <P>SOLUTION: A master damaging device 60 is constituted of a rotatable projection roller 61 which has a large number of projections 61a provided on the outer peripheral part, a displacement means 67 which displaces the projection roller 61 between a position of contact shown by a long dashed double-short dashed line where the roller is brought into contact with a platemaking image forming part 35 of the master 21 made into a plate and set on a plate cylinder 9 and a position of separation shown by a solid line where the roller is separated from the position of contact, and a control means 68 which controls a solenoid couple 65 of the displacement means 67 so that the projection roller 61 comes into contact with the platemaking image forming part 35 of the master 21 made into the plate and set on the plate cylinder 9, after printing on a prescribed number of printing sheets of paper P is ended, and also controls a main motor 112 so that the plate cylinder 9 rotates. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a printing apparatus including a stencil printing apparatus and the like, and more particularly to a printing apparatus for maintaining the confidentiality of a master for platemaking on a plate cylinder.

Conventionally, a plate cylinder made of a porous support cylinder and a master having a laminate structure in which a porous support is bonded to a thermoplastic resin film are used, and the thermoplastic resin film surface of the master is a thermal head or the like according to image information. After being heated, melted and perforated by the plate making means, it is wound around the plate cylinder, an appropriate amount of ink is supplied to the inner peripheral surface of the plate cylinder by the ink supply means provided inside the plate cylinder, and a press roller, an impression cylinder, etc. There is known a digital thermal stencil printing apparatus that performs printing by transferring and transferring ink oozing from a plate cylinder opening part and a master punching part to a sheet by pressing the sheet against the outer peripheral surface of the plate cylinder by a pressing means. Yes.
The plate cylinder is also called a printing drum, and most of the plate cylinder has a configuration in which a mesh screen as an ink holding member is wound on a single layer or a plurality of layers on the outer peripheral surface of the support cylinder. Hereinafter, in this specification, claims, and the like, a printing drum having a plate cylinder on its outer peripheral portion is also simply referred to as a “plate cylinder”.

Thus, in the stencil printing apparatus, as described above, a master is used as a plate, and the master is made according to image information to create a plate-making master on which a plate-making image is formed, and this is used as the outer peripheral surface of the plate cylinder. A predetermined number of prints are made by wrapping around the paper. After a predetermined number of printings are completed, the used master remains wound on the outer peripheral surface of the plate cylinder in order to prevent drying on the outer peripheral surface of the plate cylinder and ensure fluidity of the ink.
Next, when performing printing by performing plate making on a new master, for example, when performing plate making and printing as described above in accordance with image information from a computer such as a new document or a personal computer (hereinafter referred to as “PC”), By operating the plate removal unit, the used master wound on the plate cylinder is peeled off and transported, and this is stored and discarded in the plate release box of the plate release unit. After the plate discharging operation, or a part of the plate making unit is operated in parallel therewith, a new master is made and is wound around the plate cylinder.

  As described above, in the stencil printing apparatus, a third party can view or check the master-making image formed on the master-making master wound around the plate cylinder or the used master disposed in the waste-printing box. In some cases, it is also possible to copy and view and confirm on a sheet as a transfer material even when it is not directly visible. Therefore, when the plate-making image formed on the plate-making master wound on the plate cylinder and the used master disposed in the discharge box requires confidentiality, the secret may be leaked. . In particular, in recent stencil printing apparatuses, a unitized plate cylinder unit is configured to be detachable from the stencil printing apparatus main body in order to facilitate paper and master jam processing or to change the color of ink. Since there are many things, there is an increasing opportunity for the leakage of confidential information, and a technique for maintaining confidentiality by setting a so-called confidentiality mode or confidential mode has been proposed (for example, (See Patent Documents 1 to 4).

  Incidentally, in Japanese Patent Application Laid-Open No. 9-14001 (Patent Document 3), a heat generating member that is supported so as to be able to contact with and separate from the outer peripheral surface of the plate cylinder and a heat generating member that contacts and separates the heat generating member from the outer peripheral surface of the plate cylinder. When the driving means and the confidentiality mode are selected and the stencil printing apparatus is finished printing, the heating unit moving means is driven to bring the heating member into contact with the master wound around the plate cylinder, There has been proposed a stencil printing apparatus provided with control means for rotationally driving a plate cylinder. When the confidentiality mode is set in the stencil printing apparatus, the master wound around the plate cylinder is melted and dissolved by the heat generating member, so that the platemaking image becomes unreadable and the confidentiality can be surely maintained. Is disclosed.

JP-A-8-183238 JP-A-9-71029 JP 9-14001 A JP 2002-86882 A

  However, in the technique described in Japanese Patent Application Laid-Open No. 9-14001, as shown in FIGS. 18 and 19 of the same publication, for example, when the security key (85) is forgotten to be pressed due to human error. Since the heating member (201) is separated from the master (34) wound around the outer peripheral surface of the plate cylinder (7) and is not driven to generate heat by not being set to the confidentiality mode, the plate cylinder (7) There is a problem that confidential information formed in the master (34) is leaked.

Further, the heat generating member (201) is provided at the front end (204A) of the holder (204) that supports the front end portion of the heat generating member (201) so as to be able to contact with and separate from the outer peripheral surface of the plate cylinder (7). . Connected to the heat generating member (201) provided at the tip (204A) of the holder (204) are lead wires (203a, 203b) connected to the heat generating member drive circuit (203) and supplying power to the heat generating member (201). Has been.
Therefore, each time the heat generating member (201) swings and displaces on the master (34) wound around the outer peripheral surface of the plate cylinder (7) by the operation of the heat generating member driving means (202), the lead wire ( 203a and 203b) are also oscillating and displaced in the same manner, so that the wiring process is troublesome. In particular, the connection portion between the heat generating member (201) and the lead wires (203a and 203b) is a cause of electrical failure. However, the reliability of the operation is lowered and the configuration is complicated. This also applies to the wiring state with the heat generating member (301) shown in FIG.

  Accordingly, the present invention has been made in view of the above-described circumstances, and in a printing apparatus including a stencil printing apparatus, the master and ink are wasted based on winding a new unmade master on a plate cylinder. Of course, even if the security mode key, security key, or security mode button (security mode setting means) is forgotten to be pressed, confidential information of the master on the plate cylinder The first object of the present invention is to provide a printing apparatus capable of preventing the confidential information on the master from being leaked to the outside by making it impossible to see or transfer.

  Further, in addition to the first object or under a unique object, the present invention does not require troublesome wiring processing and has high operation reliability and a simple configuration in a printing apparatus including a stencil printing apparatus. It is possible to view and transfer confidential information of the master (plate) on the plate cylinder as well as not to waste the master and ink based on winding a new unprinted master around the plate cylinder. It is a second object of the present invention to provide a printing apparatus that can prevent confidential information on the master from leaking outside by making it impossible.

  Further, in addition to the first object or under a unique object, the present invention does not require troublesome wiring processing and has high operation reliability and a simple configuration in a printing apparatus including a stencil printing apparatus. Providing a printing device that prevents confidential information on the master from leaking out by making it impossible to view or transfer the confidential information of used masters (plates) that have been stored or discarded in a discharge box, etc. This is the third purpose.

In order to solve the above-described problems and achieve the above-described object, the invention according to each claim employs the following characteristic means and configuration.
The invention described in claim 1 is a printing apparatus having a plate cylinder around which a master including a resin film on which a plate-making image is formed is formed on the plate-making master on the plate cylinder after printing is completed. It has a damaging means for damaging the plate-making image forming unit of the master that has been made to the extent that the plate-making image cannot be read at least.
Here, “the plate-making image forming part of the plate-making master is damaged to the extent that the plate-making image formed on the plate-making master on the plate cylinder is at least unreadable” means “the plate-making on the plate cylinder To the extent that the plate-making image formed on the master is not readable, and the plate-making image formed on the plate-making master on the plate cylinder is transferred so that the plate-making image cannot be read. '' Means. That is, the prepress image formed on the preprinted master on the plate cylinder, which should be kept confidential, is scratched and broken to the extent that a person with normal vision cannot read it by viewing it. For example, it is possible to maintain confidentiality at this level, but even if the plate-making image forming unit is scratched or damaged and cannot be read, sheet-like recording such as paper is recorded on the plate-making image forming unit. This is because the prepress image may be read by pressing the medium (the same applies to claims 2 to 4).
In addition, the “plate-making image forming portion” refers to a portion including at least the thickness of the resin film in addition to the region (area) of the surface on which the plate-making image is formed on the resin film including the thermoplastic resin film. It means that the portion up to the thickness portion of the porous support is included (hereinafter the same).

  According to a second aspect of the present invention, in the printing apparatus that includes a plate cylinder on which a master including a resin film on which a plate-making image is formed is wound, and the security mode can be set, the security mode is set. In this case, after completion of printing, it has a damaging means for damaging the plate-making image forming unit of the plate-making master to the extent that the plate-making image formed on the plate-making master on the plate cylinder is at least unreadable. Features.

  According to a third aspect of the present invention, there is provided a printing cylinder having a plate cylinder on which a master provided with a resin film on which a plate-making image is formed, and capable of setting a security mode. When the confidentiality mode is set by the mode setting means and the confidentiality mode setting means, the prepressed master is set to such an extent that the prepressed image formed on the prepressed master on the plate cylinder is at least unreadable. And damaging means for damaging the plate-making image forming unit.

  The invention described in claim 4 includes a plate cylinder on which a master provided with a resin film on which a plate-making image is formed, and a plate discharging means for performing a plate discharging operation for peeling and discharging a used master on the plate cylinder. In the printing apparatus provided, at the time of the plate removal operation, the used master on the plate cylinder to the extent that the plate-making image formed on the used master on the plate cylinder is at least unreadable. It is characterized by having a damaging means for damaging the plate-making image forming portion of the pre-made master to such an extent that can be peeled and discharged.

  A fifth aspect of the present invention is the printing apparatus according to any one of the first to third aspects, further comprising a plate discharging unit for peeling and discharging a used master on the plate cylinder, wherein the damaging unit includes: The plate making image forming unit is damaged to such an extent that the used master on the plate cylinder can be peeled and discharged by the plate discharging means.

  According to a sixth aspect of the present invention, in the printing apparatus according to any one of the first to fifth aspects, the plate cylinder has an ink holding member around which the master made of the plate is wound, and the damaging means Is characterized in that the plate-making image forming portion is damaged to the extent that the ink holding member is not damaged.

According to a seventh aspect of the present invention, in the printing apparatus according to any one of the first to sixth aspects, the damaging means has a protrusion on the outer peripheral portion for contacting and damaging the plate-making image forming portion. It is characterized by being a rotatable protruding roller provided.
According to an eighth aspect of the present invention, in the printing apparatus according to the seventh aspect, the projection roller contacts the plate-making image forming portion formed on the plate-making master on the rotating plate cylinder and can be driven to rotate. And having braking means for scratching the plate-making image forming unit by applying a braking force to the driven rotation of the protrusion roller.

According to a ninth aspect of the present invention, in the printing apparatus according to any one of the first to sixth aspects, the damaging means includes a file-like projection for contacting and damaging the plate-making image forming portion. It is a file-shaped member.
According to a tenth aspect of the present invention, in the printing apparatus according to any one of the first to sixth aspects, the damaging means includes a sawtooth projection for contacting and damaging the plate-making image forming unit. It is a serrated member.

  According to an eleventh aspect of the present invention, in the printing apparatus according to any one of the first to tenth aspects, a contact position where the damaging means is brought into contact with the plate-making image forming unit and a separation position where the damage means is separated from the contact position. Displacement means for displacing between positions is provided.

  According to a twelfth aspect of the present invention, in the printing apparatus according to any one of the first to sixth aspects, the damaging means is provided on the plate-making image forming unit formed on the plate-making master on the plate cylinder. It is a laser irradiation means for damaging by irradiating a laser beam and causing thermal contraction.

  According to a thirteenth aspect of the present invention, in the printing apparatus according to the third aspect, the confidentiality mode setting means includes a manuscript reading means for reading an image of the manuscript, a readable mark formed in a specific area of the manuscript, And a control unit that automatically sets the security mode based on a signal related to reading of the sign from the document reading unit.

The printing apparatus that may leave the prepressed plate on the plate cylinder is not limited to the stencil printing apparatus, and for example, printing using a plate instead of the master in an offset printing machine or a direct printing printing machine. It can be applied as a machine.
Accordingly, claims 1 to 5 can be expressed conceptually as the following technical configuration.

The invention according to claim 1, which is expressed conceptually, is a printing apparatus having a plate cylinder around which a plate is made, and after completion of printing, the plate making formed on the plate made on the plate cylinder It is characterized by having a damaging means for damaging the plate-making image forming portion of the plate that has been pre-made so as not to read at least the image.
Here, “the plate-making image forming portion of the plate-making plate is damaged to the extent that the plate-making image formed on the plate-making plate on the plate cylinder is at least unreadable” means “the plate-making image on the plate cylinder” To the extent that the prepress image formed on the prepressed plate cannot be read, and to the extent that the prepress image cannot be read by transferring the prepress image formed on the prepressed plate on the plate cylinder Means " In other words, the prepress image formed on the prepressed plate on the plate cylinder should be kept scratched and broken to such an extent that a person with normal vision cannot read it by viewing it. For example, it is possible to maintain confidentiality at this level, but even if the plate-making image forming unit is scratched or damaged and cannot be read, sheet-like recording such as paper is recorded on the plate-making image forming unit. This is because the plate-making image may be read by pressing the medium (the same applies to claims 2 to 5 expressed in a higher conception).
In addition, the “plate making image forming portion” means that a portion including the thickness of the plate is included in addition to the area (area) of the surface of the plate on which the plate making image is formed (the same applies hereinafter).

The invention according to claim 2 expressed in a high-level concept is a case where the security mode is set in a printing apparatus which includes a plate cylinder around which a pre-made plate is wound and which can set the security mode. It is characterized by having damage means for damaging the plate-making image forming portion of the plate-made plate to the extent that the plate-making image formed on the plate-made plate on the plate cylinder is at least unreadable after printing is completed. Printing device to do.
The invention according to claim 3 expressed in a high-level concept is a security mode setting for setting the security mode in a printing apparatus having a plate cylinder around which a prepressed plate is wound and capable of setting the security mode. And the plate-making of the plate that has been made to the extent that the plate-making image formed on the plate-making plate on the plate cylinder is at least unreadable when the security mode is set by the means and the security mode setting means. And a damage means for damaging the image forming unit.
The invention according to claim 4 expressed in a high-level concept comprises a plate cylinder on which a prepressed plate is wound, and a plate discharging means for performing a plate discharging operation for peeling and discharging the used plate on the plate cylinder. In the printing apparatus, there is a damaging unit that damages the plate-making image forming unit of the plate-making plate to the extent that the plate-making image formed on the plate-making plate on the plate cylinder is at least unreadable during the plate discharging operation. It is characterized by that.
The invention according to claim 5 expressed in a high-level concept is the printing apparatus according to any one of claims 1 to 4, wherein the plate is a master having a resin film on which a plate-making image is formed, The damaging means is characterized by damaging the plate-making image forming section of the master that has been plate-printed to the extent that the plate-making image formed on the resin film is at least unreadable.

ADVANTAGE OF THE INVENTION According to this invention, the various problems which the above prior arts have can be solved, and a novel printing apparatus can be provided. The effects of each major claim are as follows.
According to the present invention, the master and ink are not wasted on the basis of winding a new unfinished master around the plate cylinder, and the confidentiality of the preprinted master on the plate cylinder is concerned. Even if the user forgets to set the confidentiality mode, the used master housed and discarded in the reclaim box with a simple configuration that does not require troublesome wiring processing and is highly reliable in operation. From the beginning, it is possible to reliably maintain the confidentiality of the pre-printed or used master wound on the plate cylinder (claim 1).

  Further, according to the present invention, the master and ink are not wasted based on winding a new unfinished master around the plate cylinder, and troublesome wiring processing is not required and the operation reliability is improved. Due to the high and simple configuration, the used master housed and discarded in the discharge box can be surely kept secret from the pre-made or used master wound on the plate cylinder (claims 2 and 2). 3).

  In addition, according to the present invention, it is possible to reliably maintain the confidentiality of the used master accommodated and discarded in the evacuation box with a simple configuration that does not require troublesome wiring processing and has high operation reliability. It is also possible to perform additional printing using a master that has been made on the plate cylinder at an appropriate time after completion (claim 4).

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention (hereinafter referred to as “embodiments”) including the best mode for carrying out the present invention and examples will be described below with reference to the drawings. In the embodiments and modifications, components such as members and components having the same functions and shapes are described with the same reference numerals, and the description thereof will be omitted. In order to simplify the drawings and the description, even components that are to be represented in the drawings may be omitted as appropriate without being specifically described in the drawings. When quoting and explaining components such as published patent gazettes, the reference numerals including the conventional technology described in the column of problems to be solved by the invention are shown in parentheses to distinguish them from those of each embodiment, etc. Shall.

(First embodiment)
First, an overall configuration of a stencil printing apparatus 1 as an example of a printing apparatus according to a first embodiment to which the present invention is applied will be described with reference to FIGS. In the figure, reference numeral 8 denotes an apparatus main body that forms the framework of the stencil printing apparatus 1. In the upper part of the apparatus main body 8, the part indicated by reference numeral 7 is an image reading unit, the part indicated by reference numeral 3 below is the plate making part, the part indicated by reference numeral 2 on the left side is the printing part, and the reference numeral 5 on the left side thereof. The portion indicated by is a discharge portion, the portion indicated by reference numeral 4 below the plate making portion 3 is a paper feeding portion, and the portion indicated by reference numeral 6 on the left side of the printing portion 2 is a paper discharge portion.

  The printing unit 2 is disposed almost at the center of the apparatus main body 8, and includes a plate cylinder 9 that winds a plate-making master 21 on which a plate-making image is formed, and a plate-making master on the plate cylinder 9. 21 and a press roller 10 as pressing means for pressing the paper P against the paper 21. The printing unit 2 has a function and configuration for printing by pressing the paper P fed from the paper feeding unit 4 to the master 21 on the plate cylinder 9 that is rotationally driven by the press roller 10.

The plate cylinder 9 is a pair of end plates (disposed on the front side and the back side of the paper in FIG. 1) rotatably supported by the support shaft 11 shown in FIG. 1 which also serves as an ink supply pipe, and FIG. As shown in an enlarged and exaggerated manner in FIG. 2, the structure is mainly composed of a porous support plate 9a wound around the outer peripheral surface of each end plate and a mesh screen 9b wound around the outer peripheral surface of the porous support plate 9a. ing.
The porous support plate 9a is formed, for example, by etching a thin plate made of stainless steel or a thin plate formed by nickel electroforming, each having a cylindrical shape, and has a large number of ink-permeable holes. ing. The porous support plate 9a may be called a porous support cylinder or simply a plate cylinder.

  The mesh screen 9b is formed of a mesh number # 100-400 which is woven with fine wires made of metal (for example, stainless steel) or resin (for example, polyester). The mesh screen 9b has a function as an ink holding member that diffuses and holds the ink that oozes from the numerous holes of the porous support plate 9b, and discharges the ink by pressing, and has one or more layers (usually normal) 1 to 3 layers).

The plate cylinder 9 is a drive mechanism similar to the drive mechanism of the plate cylinder (7) shown in FIG. 6 of JP-A-9-14001, for example, and described in paragraphs “0012” and “0016” to “0020”. 1 is rotated in the arrow direction (clockwise) in FIG. In FIG. 1, the code | symbol 112 shows the main motor as a plate cylinder drive means replaced with the motor (12) which comprises the drive mechanism of the said plate cylinder (7). The main motor 112 is composed of, for example, a DC motor capable of forward and reverse control.
Further, around the plate cylinder 9 and the main motor 112, an encoder (22) shown in FIGS. 6 and 9 of the above-mentioned JP-A-9-14001 and described in paragraphs “0016” to “0020”, Similar to the pulse detection sensor (23) and the home position sensor (26), components for detecting and controlling the rotational position (rotational angle) and rotational speed (printing speed) of the plate cylinder 9 are disposed. In the present embodiment, in order to simplify the description, the main components are simply shown in FIG. 2 with the reference numerals obtained by adding the numerical value “100” to the reference numerals of the respective constituent elements. That is, in FIG. 2, reference numeral 122 denotes an optical encoder attached and fixed to the output shaft of the main motor 112, and reference numeral 123 denotes pulse detection fixed to the apparatus main body 8 so as to sandwich the outer periphery of the encoder 122. Reference numeral 126 denotes a home position sensor for detecting the home position of the plate cylinder 9.
FIG. 6 of the above-mentioned Japanese Patent Application Laid-Open No. 9-14001 shows a predetermined portion near the outer peripheral edge of the end plate (not shown) on the back side of the plate cylinder 9 that is not shown. A light shielding plate (not shown) similar to the dog (25) is attached and fixed. The light shielding plate is disposed at the predetermined portion of the plate cylinder 9 in order to detect the home position of the plate cylinder 9.

  An openable / closable clamper 12 for holding the master 21 on the plate cylinder 9 is provided on the outer peripheral surface of the plate cylinder 9. The clamper 12 can peel the used master 21 from the plate supply position shown in FIG. 1 where the tip of the master 21 conveyed and supplied from the plate making unit 3 can be received, and the plate cylinder 9. When the plate cylinder 9 selectively occupies a possible plate removal position (not shown), it is opened and closed by a known opening / closing means provided on the apparatus main body 8 side. A known ink supply means 15 having an ink roller 13 and a doctor roller 14 is disposed inside the plate cylinder 9.

  The home position of the plate cylinder 9 is set in advance so that the rotation center axis of the clamper 12 is located directly above in FIG. In this embodiment, like the plate cylinder (7) shown in FIG. 6 of the above-mentioned Japanese Patent Application Laid-Open No. 9-14001, the plate cylinder 9 is a plate that is detachable from the apparatus main body 8 together with the ink supply means 15 and the like. Only when the plate cylinder 9 occupies the home position, the cylinder unit is configured to be attachable to and detachable from the apparatus main body 8 through the engagement / disengagement relationship between gears (not shown). However, in the present embodiment, the secret mode position sensor (27) shown in FIG. 6 of the above-mentioned Japanese Patent Application Laid-Open No. 9-14001 is not an indispensable configuration and may be omitted due to a configuration unique to the present invention described later. Absent.

  A press roller 10 is disposed below the plate cylinder 9 so as to face the ink roller 13. Both ends of the press roller 10 are rotatably supported between a pair of press roller arms 16, and each press roller arm 16 is swung by a not-shown press roller rocking means to be placed on the outer peripheral surface of the plate cylinder 9. It is approached and separated. The press roller 10 is provided with an obstacle such as a printing position indicated by a two-dot chain line in FIG. 1 that is pressed against the outer peripheral surface of the plate cylinder 9 by the operation of the press roller oscillating means, and a clamper 12 that moves as the plate cylinder 9 rotates. It selectively occupies a non-printing position indicated by a solid line in FIG. 1 separated from the printing position that does not interfere with an object. Around the press roller arm 16, a well-known locking means for holding the press roller 10 in a non-printing position is also provided.

The plate making unit 3 has a function and a structure for making the master 21 and transporting and feeding the master 21 after the plate making to the outer peripheral surface of the plate cylinder 9. The plate making section 3 includes a master roll support member 17, a platen roller 18, a thermal head 19 as plate making means, a cutting means 20 and the like.
The master roll support member 17 supports a master roll in which the master 21 is wound in a roll shape so as to be rotatable and detachable.

  As shown in an enlarged and exaggerated manner in FIG. 3, the master 21 has a laminate structure in which a thermoplastic resin film 21b and a porous support 21a are bonded together. The master used in the present embodiment is not limited to the one having the above-described configuration, but is a heat-sensitive stencil master proposed in Japanese Patent Laid-Open No. 10-147075 and already in practical use, that is, its thickness is compared with that of a conventional one. A master that is thin and has a relatively low strength and a bending stiffness of 5 mN or more may be used.

  The master proposed in the above-mentioned Japanese Patent Application Laid-Open No. 10-147075 is provided on the side of the thermal head 19 disposed in the plate-making part 3 that faces and contacts the heating element through a protective film (not shown) (printing on the paper P). In this order, the laminated structure is composed of four layers of a stick prevention layer, a thermoplastic resin film, a porous resin film, and a porous fiber layer. The thermoplastic resin film and the porous resin film are fixed substantially integrally by applying a porous resin liquid to the thermoplastic resin film. The porous fiber layer is bonded and fixed on the surface of the porous resin film by applying an appropriate adhesive to the end facing or contacting the porous resin film. When this master is roughly expressed from its function with reference to FIG. 3, the thermoplastic resin film 21b to be heat-melted and perforated, and the porous support 21a for holding the strength and holding the waist are provided. It can be considered that it is comprised from the said porous fiber layer and the said porous resin film.

  As the thermoplastic resin film 21b, a conventionally known film such as polyester, polyamide, polypropylene, polyethylene, polyvinyl chloride, polyvinylidene chloride or a copolymer thereof is used, and a polyester film is particularly preferably used from the viewpoint of perforation sensitivity. . Preferred examples of the polyester used in the polyester film include polyethylene terephthalate, a copolymer of ethylene terephthalate and ethylene isophthalate, and a copolymer of hexamethylene terephthalate and cyclohexanedimethylene terephthalate. In order to improve the perforation sensitivity, particularly preferred are a copolymer of ethylene terephthalate and ethylene isophthalate, a copolymer of hexamethylene terephthalate and cyclohexanedimethylene terephthalate, and the like.

  If necessary, the thermoplastic resin film 21b may be provided with an organic lubricant such as a flame retardant, heat stabilizer, antioxidant, ultraviolet absorber, antistatic agent, pigment, dye, fatty acid ester, wax, or polysiloxane. A foaming agent etc. can be mix | blended. Furthermore, easy slipperiness can be imparted as required.

The platen roller 18 is rotationally driven by a stepping motor 22. The thermal head 19 has a large number of heating elements and is configured to be able to come into contact with and separate from the platen roller 18 by contact / separation means (not shown), and is pressed against the platen roller 18 during plate making. The thermal head 19 is connected to the surface of the thermoplastic resin film 21b of the master 21 based on an image data signal as image information transmitted through a plate making control unit and a thermal head drive circuit (not shown). Is selectively heated to perform hot melt perforation plate-making on the thermoplastic resin film 21b portion of the master 21 to form a plate-making image corresponding to the image data signal.
As the image information, in addition to the image information of the original 69 read by the image sensor 44 of the image reading unit 7, in the case where the image information is connected to the stencil printing apparatus 1 via a network or the like, a personal computer or the like can be used. Image information transmitted from a computer (external image information input means) is also included.

  The cutting means 20 has a movable blade and a fixed blade, and cuts the master 21 by moving the movable blade up and down or rotating relative to the fixed blade. Two sets of master conveyance rollers for conveying the master 21 and a master guide plate for guiding the conveyance are disposed on the downstream side of the cutting unit 20 in the conveyance direction of the master 21.

  The paper feed unit 4 includes a paper feed tray 23 as a paper feed stand, a paper feed roller 24, a separation roller 25, a separation roller 26, a registration roller pair 27, and the like. The sheet feeding tray 23 is loaded with a large number of sheets P on its upper surface and is supported by the apparatus main body 8 so as to be movable up and down, and is moved up and down by lifting means (not shown). The paper feed roller 24 and the separation roller 25 each have a high friction resistance member on the surface thereof, and are in contact with the paper P on the paper feed tray 23 at a predetermined pressure and rotated in synchronization with each other by a common stepping motor 28. Driven. The separation roller 26 is in pressure contact with the separation roller 25 and is intermittently rotated in the same direction as the separation roller 25. The registration roller pair 27 includes a drive roller and a driven roller, and is rotationally driven in synchronization with the rotation of the plate cylinder 9 to feed the paper P toward the printing unit 2 at a predetermined timing.

  The plate discharging unit 5 has a function and configuration as a plate discharging unit that performs a plate discharging operation for peeling and discharging the used master 21 wound around the outer peripheral surface of the plate cylinder 9. The plate discharging unit 5 includes a plate discharging conveyance means 29, a plate discharging box 30, a compression plate 31, and the like. Note that the plate discharging box 30 and the compression plate 31 shown here have the same configuration as the plate discharging apparatus (6) disclosed by the applicant of the present invention in Japanese Patent Laid-Open No. 10-226147, and therefore detailed description thereof is omitted.

The discharged plate conveying means 29 has a peeling roller 32 and a discharged plate conveying roller pair 33. The peeling roller 32 is made of a member having high friction resistance and ink corrosion resistance (oil resistance) such as nitrile rubber or chloroprene rubber, and its central portion is fixed to a spindle having a wheel shape. A plurality are provided. The support shaft is rotationally driven by a peeling roller driving motor (not shown), whereby each peeling roller 32 is integrally rotated clockwise in FIG.
The discharge plate conveying roller pair 33 includes a driving roller disposed on the lower side and a driven roller disposed on the upper side in FIG. 1, and a plurality of pairs are disposed in the master width direction in pairs. Each drive roller and each follower roller are fixed at their central portions to the respective support shafts, and the support shaft on the drive roller side is rotationally driven by an unillustrated plate conveying motor, whereby each drive roller in FIG. Around, each driven roller is driven to rotate counterclockwise in FIG. A spring as an urging means (not shown) is attached to the support shaft on the drive roller side, and each driven roller is in pressure contact with the corresponding drive roller. The rotational speed of a plate conveying motor (not shown) is controlled so that the rotational peripheral speed of each drive roller exceeds the rotational peripheral speed of the plate cylinder 9 at the time of discharging.

The paper discharge unit 6 has a function and configuration for peeling the paper P printed by the printing unit 2 from the outer peripheral surface of the plate cylinder 9 and discharging it to a paper discharge tray 39 as a paper discharge table. The paper discharge unit 6 includes a peeling claw 37, a paper discharge transport unit 38, the paper discharge tray 39, and the like.
The peeling claw 37 has a function of peeling the printed paper P from the outer peripheral surface of the plate cylinder 9 and is supported by the apparatus main body 8 so as to be swingable. The position which adjoins the outer peripheral surface of the plate cylinder 9 and the position where the front-end | tip does not interfere with obstructions, such as the clamper 12 which moves with rotation of the plate cylinder 9, are occupied selectively.

  The paper discharge conveyance unit 38 includes a driving roller, a driven roller, an endless belt having a large number of air suction holes, a suction fan, and the like, and is peeled off from the outer peripheral surface of the plate cylinder 9 by a peeling claw 37. The sheet P is conveyed in the direction indicated by the arrow in FIG. 1 while being sucked onto the endless belt. The paper discharge tray 39 stacks the paper P conveyed by the paper discharge conveyance unit 38 on its upper surface, and has a pair of side fences movable in the paper width direction and one end fence movable in the paper conveyance direction. And have.

  The image reading unit 7 has a function / configuration for reading an image of the document 69. The image reading unit 7 includes a contact glass 40 on which an original 69 is placed, a pressure plate 41, a scanning unit 42 that scans and reads the original 69, a lens 43 that focuses the scanned image, and a CCD (charge) that processes the focused image. An image sensor 44 such as a coupling element) is provided, and an ADF unit 45 that automatically conveys the document 69 to the document reading unit is disposed above the pressure plate 41.

  FIG. 5 shows the operation panel 46 of the stencil printing apparatus 1. The operation panel 46 is provided on the upper front surface of the apparatus main body 8. On the upper surface of the operation panel 46, a plate making start key 47, a printing start key 48, a trial printing key 49, a continuous key 50, a clear / stop key 51, a numeric keypad 52, and an enter key are provided. 53, a program key 54, a mode clear key 55, a printing speed setting key 56, a four-direction key 57, a display device 58 including a 7-segment LED (light emitting diode), a display device 59 including an LCD (liquid crystal display device), and the like. It has a configuration. The present embodiment is also characterized in that the operation panel 46 is not provided with a security mode key as security mode setting means for setting the security mode.

Next, a configuration unique to this embodiment will be described.
In the vicinity of the outer peripheral surface of the plate cylinder 9 between the plate conveying roller pair 33 arrangement portion and the separation claw 37 arrangement portion, the plate making image forming portion 35 of the master 21 on the plate cylinder 9 after printing is finished (FIG. 4). A master damaging device 60 having a protruding roller 61 or the like as a damaging means for damaging a broken line hatched area) is disposed.

  As shown in detail in FIGS. 2 and 4, the master damaging device 60 is configured so as to be able to come into contact with and separate from the master 21 on the plate cylinder 9, and on the plate-making image forming unit of the master 21 on the plate cylinder 9. A rotatable protrusion roller 61 having a large number of protrusions 61a on the outer peripheral portion for contacting and damaging the protrusion 61 and the protrusion roller 61 contacts the plate-making image forming portion 35 of the master 21 on the plate cylinder 9 which has been made. 2 and 4, the displacement means 67 for displacing between the contact position shown by the two-dot chain line in FIG. 2 and FIG. 4 and the separation position shown by the solid line in FIG. 2 and FIG. After the printing on the paper P is completed, the displacement means 67 is controlled so that the projection roller 61 contacts the plate making image forming portion 35 of the master 21 on the plate cylinder 9 and the plate cylinder 9 rotates. The main motor 112 Are mainly composed Gosuru control means 68..

  The protruding roller 61 is made of a metal such as stainless steel and is substantially integrally formed with the roller shaft 61b. The protrusion roller 61 includes the surface density of a large number of sharp protrusions 61a formed on the outer peripheral portion, the shape of the protrusion 61a (the length (height) of the protrusion 61 from the protrusion 61a formation base in the protrusion roller 61, and the degree of taper). ) And the pressing force of the projection roller 61 (pressing force of a solenoid pair 65 to be described later) against the master 21 already made on the plate cylinder 9 is designed in detail.

  That is, the required performance of the protrusion roller 61 is such that the plate-making image formed on the plate-making master 21 on the plate cylinder 9 cannot be read and cannot be transferred by the plate-making image ( (Confidentiality required performance) and to the extent that the used master 21 on the plate cylinder 9 can be peeled and removed by the plate removal unit 5 (removed plate quality required performance) and not to damage the mesh screen 9b ( Print quality required performance).

  The width dimension Wb along the sheet width direction Y of the protrusion roller 61 is shorter than the width dimension along the sheet width direction Y of the master 21 that has been pre-rolled around the outer peripheral surface of the plate cylinder 9, and has already been made. 21 is formed and set longer than the width dimension Wa along the paper width direction Y of the plate-making image forming portion 35 area formed in 21.

  The displacement means 67 includes a pair of arms 64 and 64 (hereinafter referred to as “arm pair 64”) as swing members, a support shaft 62, and a pair of tension springs 63 and 63 (hereinafter referred to as “tensile spring pair” as biasing means). 63 ”), and is composed mainly of a pair of solenoids 65 and 65 (hereinafter referred to as“ solenoid pair 65 ”) as driving means. In FIG. 4, reference numerals 34 a and 34 b indicate a pair of side plates fixed to the printing unit 2 of the apparatus main body 8.

The arm 64 has a plate shape, and a roller shaft 61b is rotatably supported at one end (upper end in FIG. 2), and a plunger 65a of a solenoid 65 is pinned at the other end (lower end in FIG. 2). It is loosely connected via 66. A support shaft 62 whose both ends are supported by a pair of side plates 34a and 34b shown in FIG. One end portion of a tension spring 63 that urges the protruding roller 61 in a direction that always occupies the separated position is locked between each support portion of the roller shaft 61 b and each fixing portion of the support shaft 62 in the arm pair 64. ing. The other end portion of the tension spring pair 63 is locked to a non-illustrated immovable member fixed to the side plate pairs 34a and 34b. In FIG. 2, the illustration of the side plate pairs 34a and 34b is omitted. As described above, the both ends of the roller shaft 61b are supported by bearings (not shown) provided at the respective one ends of the arm pair 64, so that the protruding roller 61 can be described with reference to FIG. In the direction of the arrow (counterclockwise) indicated by a two-dot chain line in FIG. It is configured to be driven and rotatable.
The solenoid pair 65 is of the same specification (power consumption, shape dimensions, etc.) and is of a pull type (the same applies to the solenoid 65 in the second and third embodiments described below and the modified examples 2 and 3). Therefore, this description is omitted below). Similarly, the tension spring pair 63 also has the same specifications (spring load, shape dimensions, etc.) (the same applies to the tension spring pair 63 in the first to third embodiments to be described later and the first to third modifications). Therefore, this description is omitted below).

  Note that the solenoid pair 65 as the driving means and the tension spring pair 63 as the urging means are not limited to this. For example, priority is given to cost reduction of the master damaging device, and the plate cylinder 9 along the sheet width direction Y of the plate cylinder 9 is used. If it is not necessary to have a uniform contact state with the protruding roller 61 at both end positions, the solenoid 65 may be disposed only on one of the side plates 34a or 34b (the first to be described later). The same applies to the solenoid 65 and the tension spring 63 in the second and third embodiments and the modified examples 2 and 3, and the description thereof will be omitted below.

  The control means 68 includes, for example, a CPU (not shown) and a ROM and RAM (not shown) as storage means. The CPU includes a rotation position signal (angle signal) of the main motor 112 detected by the pulse detection sensor 123 and transmitted through a pulse counter and a comparator (not shown), a home position sensor 126, a print number counter 128, and the like. Output signals from various keys of the operation panel 46 are input. The printed sheet counter 128 is composed of a sensor input circuit including a reflection type photosensor disposed between the upper and lower ends of the endless belt provided in the paper discharge conveyance unit 38, and printed paper other than plate printing described later. By detecting the leading and trailing edges of P, it has a function of counting the number of regular printed sheets.

  Each of the inputted signals is subjected to arithmetic processing based on an operation program described later stored in the ROM, to the main motor 112 via a motor drive circuit (not shown), and to the solenoid pair 65 via a solenoid drive circuit (not shown). These are output as operation / command signals to the display devices 58 and 59 via a light emitting diode driving circuit and a liquid crystal driving circuit, respectively, not shown.

  The control means 68 performs a calculation relating to the remaining number of prints based on a predetermined print number setting signal set by the numeric keypad 52 and a signal related to the number of printed sheets from the print number counter 128, and as a result, a predetermined print number When it is determined that printing on the number of sheets P has been completed, the rotation position (home position) of the plate cylinder 9 is determined based on the signals relating to the rotation position of the plate cylinder 9 from the pulse detection sensor 123 and the home position sensor 126. And the main motor 112 is turned on and controlled so that the plate cylinder 9 rotates at a predetermined number of rotations stored in advance in the ROM, and at this time, a signal relating to the rotational position of the plate cylinder 9 is applied. Based on this, the solenoid pair 65 is turned on so that the projection 61a of the projection roller 61 comes into contact with the plate-making image forming portion 35 of the master 21 on the plate cylinder 9 and has been scratched. Controlled, it has a function of projecting rollers 61 are turned off drive and control the solenoid pair 65 so as not to interfere with the clamper 12 disposed portion of the plate cylinder 9.

  In the RAM, various signals from the sensors and various keys input to the CPU, calculation results of the CPU, or an operation program called from the ROM by the CPU are temporarily written. The ROM stores home position information of the plate cylinder 9 and relational data necessary for executing the operation program (the same applies to the control means of the embodiments and modifications described later). Therefore, this description is omitted below).

Based on the above configuration, the operation of the stencil printing apparatus 1 will be described below.
The user sets a document 69 to be printed on the image reading unit 7, sets the platemaking conditions using various keys on the operation panel 46, and then presses the platemaking start key 47.
When the plate making start key 47 is pressed, first, a plate discharging operation is performed in the plate discharging unit 5 for peeling and discharging the used master 21 from the outer peripheral surface of the plate cylinder 9 used in the previous printing. In the present embodiment, the used master 21 that is peeled and discharged from the outer peripheral surface of the plate cylinder 9 by the plate discharging operation is already applied to the plate cylinder 9 by the operation of the master damaging device 60 as described in detail later. Used master on the plate cylinder 9 by the plate removing unit 5 to such an extent that the plate-making image formed on the master-made master 21 is not readable and cannot be transferred by the plate-making image. The screen 21 is scratched to such an extent that the screen 21 can be peeled and discharged, and the mesh screen 9b is not damaged.

  As will be described later, the solenoid pair 65 is not energized by a command from the control means 68 until the end of normal printing for a predetermined number of printed sheets, and the solenoid pair 65 is turned off in a non-excited state. Due to the urging force of 63, the protruding roller 61 supported on one end of the arm pair 64 occupies a separated position and is held at the same position as shown in FIG.

  The plate cylinder 9 on which the used master 21 that has already been damaged as described above is wound around the outer peripheral surface is clamped by the clamper 12 at the leading end of the master 21 when the main motor 112 is activated. The portion is rotated until it reaches the plate discharge position corresponding to the peeling roller 32. When the plate cylinder 9 reaches the plate removal position, the drive of the main motor 112 is stopped to stop the rotation of the plate cylinder 9 and the clamper 12 is opened approximately 180 degrees by the operation of the opening / closing means. Thereafter, a peeling roller drive motor (not shown) and a platen part swinging means (not shown) are operated to occupy the peeling position while each peeling roller 32 rotates, and the leading end portion of the master 21 is moved to the outer periphery of the plate cylinder 9 by each peeling roller 32. It is scooped up from the surface.

A plate discharge conveyance motor (not shown) is operated almost simultaneously with an operation of a peeling roller drive motor (not shown), and each plate discharge conveyance roller pair 33 is rotationally driven in a direction indicated by an arrow in FIG. The leading end portion of the master 21 scooped up from the outer peripheral surface of the plate cylinder 9 is sent to each discharge plate conveying roller pair 33 by the rotation of each peeling roller 32, and is transferred into the discharge plate box 30. When the leading end portion of the master 21 is detected by a plate removal sensor (not shown), the operation of a peeling roller drive motor (not shown) is stopped, and a plate discharging portion swinging unit (not shown) is operated to stop each peeling roller 32. And occupies a standby position.
When the leading end of the master 21 is detected by the above-mentioned plate discharge sensor, the plate cylinder 9 also starts to rotate clockwise in FIG. 1 at a low speed. At this time, the rotational speed of a plate discharge motor (not shown) is controlled so that the rotational peripheral speed of each drive roller 33a exceeds the rotational peripheral speed of the plate cylinder 9. Then, the master 21 wound on the plate cylinder 9 is peeled off from the outer peripheral surface of the plate cylinder 9 while a tension is applied between both by the rotation of the plate cylinder 9 and the rotation of each discharge plate conveying roller pair 33. And accommodated in the inside of the plate removal box 30.

  When it is determined that the plate cylinder 9 occupies a predetermined position and all the masters 21 are peeled off from the plate cylinder 9 and accommodated in the discharge box 30, the rotation of each discharge plate conveying roller pair 33 and the plate cylinder 9 is stopped. The Thereafter, the compression plate 31 is rotated by a predetermined angle to push the master 21 into the discharge box 30 and the plate cylinder 9 is driven to rotate, so that the plate cylinder 9 reaches the plate supply position shown in FIG. When the clamper 12 is opened as indicated by the two-dot chain line by the operation of, the plate removal operation is completed.

When the plate removal operation is completed, the image reading unit 7 performs the reading operation of the document 69. The read image is focused by the lens 43 and then input to the image sensor 44 and subjected to photoelectric conversion. The image sensor 44 sends the input image data to an A / D converter (not shown) and a plate making control unit.
In parallel with the reading operation, the platen roller 18 and the thermal head 19 are operated in the plate making unit 3, and the plate making operation to the master 21 based on the image data is performed to form a plate making image. The master 21 that has been subjected to plate making is sent to the clamper 12, and if it is determined from the number of steps of the stepping motor 22 that the tip of the master 21 has reached the clamper 12, the clamper 12 is closed by the operation of the opening / closing means. Thereafter, the plate cylinder 9 is rotationally driven in the clockwise direction in FIG. 1 at the same rotational peripheral speed as the conveying speed of the master 21 that has been subjected to plate making, and the winding operation of the master 21 that has been subjected to plate making is performed. When the image data signal from the image reading unit 7 is interrupted, the operation of the thermal head 19 is stopped. After that, when it is determined from the number of steps of the stepping motor 22 that the master 21 for one plate has been transported, the plate has been made. The conveyance of the master 21 is stopped, and the cutting means 20 is operated to cut the master 21. The cut master 21 is pulled out from the plate making section 3 by the rotation of the plate cylinder 9, and the plate cylinder 9 is stopped at the home position to complete the plate feeding operation.

  The printing operation is performed following the plate feeding operation. When the plate cylinder 9 reaches the home position and a dog (light-shielding plate) (not shown) is detected by the home position sensor 126, a signal is sent from the home position sensor 126 to the CPU (hereinafter sometimes referred to as “control means 68”). Is output. The control means 68 receives the signal from the home position sensor 126 and controls the main motor 112 to stop the rotation of the main motor 112. After the plate cylinder 9 is stopped at the home position due to the stop of the main motor 112, the plate cylinder 9 is driven to rotate at a low speed, and the paper feed roller 24, the separation roller 25, and the paper discharge transport unit 38 are driven, respectively. The sheet P positioned at the top of the sheet 23 is separated and fed, and the leading end of the sheet P is brought into contact with the nip portion of the registration roller pair 27, whereby a predetermined curved deflection is formed at the leading end of the sheet P. The The registration roller pair 27 feeds the sheet P to the plate cylinder 9 at a predetermined timing when the leading edge of the image area in the plate cylinder rotation direction of the master 21 that has been wound around the plate cylinder 9 reaches the position corresponding to the press roller 10. To the press roller 10. At almost the same time, as shown in FIG. 3, the press roller 10 swings and its peripheral surface is pressed against the outer peripheral surface of the plate cylinder 9 with a predetermined pressure contact force. Hereinafter, the detailed description related to the start / stop of the main motor 112 will be omitted because it is obvious by the rotational drive / stop of the plate cylinder 9.

  The paper P is pressed by the press roller 10 against the master 21 that has been wound around the plate cylinder 9, whereby the press roller 10, the paper P, the master 21 that has been prepressed, and the plate cylinder 9 are brought into pressure contact with each other, and ink supply means. 15, the ink supplied to the inner peripheral surface of the plate cylinder 9 oozes out from the apertures of the porous support plate 9 a of the plate cylinder 9 and the mesh portion of the mesh screen 9 a, and the outer peripheral surface of the plate cylinder 9 and the master that has been subjected to plate making After being filled in the gap between the porous support 21a and the porous support 21a, it is transferred to the paper P through the perforated portion of the thermoplastic resin film 21b, and so-called printing is performed. The paper P to which the ink has been transferred is peeled off from the outer peripheral surface of the plate cylinder 9 at the tip of the peeling claw 37 and falls downward, and is sucked and conveyed to the left by the paper discharge transport unit 38 and is discharged onto the paper discharge tray 39. To be discharged. Thereafter, the plate cylinder 9 again occupies the home position and stops, and the plate making operation is completed, and the stencil printing apparatus 1 enters a print standby state. Note that the paper P printed by the printing operation is not counted by the print number counter 128 as the normal print number.

  When the trial printing key 49 is pressed after the stencil printing apparatus 1 is in a print standby state, only the topmost sheet P on the paper feed tray 23 is separated and fed as in the case of printing, and the registration is performed. While being sandwiched by the roller pair 27, the plate cylinder 9 is driven to rotate at a higher speed than during plate attachment. The registration roller pair 27 feeds the paper P at a predetermined timing between the plate cylinder 9 and the press roller 10 rotating at a high speed, and the fed paper P is fed by the press roller 10 to the plate cylinder 9. After the ink is transferred to the master 21 wound around the paper, the ink is transferred onto the paper discharge tray 39 in the same manner as described above. The plate cylinder 9 is then returned to the home position again to complete the trial printing operation.

The test print confirms the density of the print image and the print image position, adjusts these appropriately with the various keys on the operation panel 46, performs the test print again, and then sets the number of prints on the display device 58 using the numeric keypad 52. Then, by setting a desired print speed with the print speed setting key 56 and pressing the print start key 48, the paper P is continuously fed from the paper supply unit 4 and a printing operation is performed.
When the set number of prints is consumed, the plate cylinder 9 returns to the home position again and stops, the printing operation is completed, and the stencil printing apparatus 1 enters the plate making standby state again. At this time, the control means 68 performs a calculation related to the remaining number of prints based on a predetermined print number setting signal set by the numeric keypad 52 and a signal related to the number of printed sheets from the print number counter 128, and the remaining print number is calculated. The number of sheets is displayed on the display device 58. Then, when the control means 68 determines that printing on the predetermined number of sheets of paper P has been completed, based on the signals relating to the rotational position of the plate cylinder 9 from the pulse detection sensor 123 and the home position sensor 126, the plate After recognizing that the rotational position of the cylinder 9 has occupied the home position, the main motor 112 is activated so that the plate cylinder 9 rotates clockwise at a rotational peripheral speed that is the same as or slightly faster than that at the time of printing. Begin to.

  The control means 68 refers to the rotational position signal of the main motor 112 detected by the pulse detection sensor 123 and transmitted through the pulse counter and the comparator, and the clamper 12 arrangement portion of the plate cylinder 9 faces the protruding roller 61. At the rotational position of the plate cylinder 9 past the position, that is, at the rotational position of the plate cylinder 9 where the tip of the used master 21 on the plate cylinder 9 is substantially opposite to the protruding roller 61, the solenoid pair 65 of the displacement means 67. This is turned on to energize. When the solenoid pair 65 is energized and turned on, the plunger 65a connected to the other end of the arm pair 64 is pulled leftward in FIG. 2 (upward in FIG. 4). The protruding roller 61 supported at one end portion is swung and displaced clockwise around the support shaft 62 in FIG. 2 against the urging force of the tension spring pair 63 to occupy the contact position.

  When the protruding roller 61 occupies the contact position, the protruding roller 61 comes into contact with the plate-making image forming unit 35 (see FIG. 4) formed on the plate-making master 21 on the plate cylinder 9 that rotates clockwise in FIG. 2, while being rotated counterclockwise indicated by a two-dot chain line in FIG. 2, a large number of protrusions 61 a penetrate the thermoplastic resin film 21 b of the plate-making image forming unit 35 and further to a depth of about half of the porous support 21 a. Since a large number of fine holes are formed by entering, the plate-making image formed on the plate-making master 21 on the plate cylinder 9 is made unreadable and cannot be transferred by the plate-making image. In addition, the used master 21 on the plate cylinder 9 can be peeled and discharged by the discharging unit 5 and is scratched and damaged to the extent that the mesh screen 9b is not damaged. That.

  Here, the number of times the projection roller 61 is pressed against the plate making image forming unit 35 of the used master 21 on the plate cylinder 9, in other words, the plate cylinder 9 is rotated a plurality of times to make the projection roller 61 on the plate cylinder 9. The number of times of abutting and pressing against the plate-making image forming unit 35 of the master 21 can be arbitrarily set according to the user's request. That is, depending on the operation program contents of the ROM, or by using a PROM (programmable read-only storage device) instead of the ROM, the master damaging device 60 is operated over a plurality of rotations of the plate cylinder 9. In this case, the control means 68 refers to the rotational position signal of the main motor 112 detected by the pulse detection sensor 123 and transmitted through the pulse counter and the comparator, and the plate cylinder The energizing force to the solenoid pair 65 is turned off at the rotational position of the plate cylinder 9 before the position where the 9 clamper 12 arrangement portion passes the position facing the projecting roller 61, whereby the projecting roller 61 is moved by the urging force of the tension spring pair 63. Since it occupies the separated position, interference between the protrusion roller 61 and the clamper 12 arrangement portion can be avoided. As described above, when the master damaging device 60 is operated over a plurality of rotations of the plate cylinder 9, compared with the case where the master damaging device 60 is operated only for one rotation of the plate cylinder 9, the protrusion roller 61 causes the upper surface on the plate cylinder 9. A plate-making image formed on the plate-making master 21 on the plate cylinder 9 is obtained by uniformly forming scratches by forming many fine holes in the used master 21 and increasing the surface density of the scratches. Cannot be read more reliably and transfer by the plate-making image cannot be made more reliable, so that the pre-printed or used master 21 wound on the plate cylinder 9 can be more securely maintained. .

  The plate cylinder 9 is not limited to this and may not have the mesh screen 9b. Thus, in the case of a plate cylinder substantially consisting only of the porous support plate 9a, the print quality required performance that the protrusion roller 61 of the master damaging device 60 should have, ie, “to the extent that the mesh screen 9b is not damaged”. (This is the same in the second and third embodiments and modified examples 1 to 3 described later, and will not be described below.)

  Therefore, according to the first embodiment, since the master and ink are not wasted based on winding a new unfinished master around the plate cylinder, the necessity of confidentiality of the master 21 already made Regardless of the above, the used master 21 accommodated and discarded in the plate removal box 30 is wound around the plate cylinder 9 from the beginning by a simple configuration that does not require troublesome wiring processing and has high operation reliability. Further, there is an advantage that confidentiality of the master 21 that has been pre-made or used can be surely maintained.

(Modification 1)
This modification 1 is different from the first embodiment only in that it has braking means for applying a predetermined braking force (braking force) to the counterclockwise driven rotation of the protruding roller 61. . Except this point, the second embodiment is the same as the first embodiment.
Here, the predetermined braking force is indicated by a two-dot chain line in FIG. 2 when the projection roller 61 contacts the plate making image forming unit 35 (see FIG. 4) formed on the plate making master 21 on the plate cylinder 9. While being driven and rotated so as to be dragged counterclockwise, a large number of protrusions 61a penetrate the thermoplastic resin film 21b of the plate-making image forming portion 35, and further enter a depth about half that of the porous support 21a. It means a braking force that forms a large number of holes and at the same time gives scratches and damages to the plate-making image forming unit 35.
As the braking means, for example, a braking force is applied by pressing a plate spring against both ends of the roller shaft 61b, or electromagnetically is applied to the support portions of the side plates 34a and 34b that rotatably support both ends of the roller shaft 61b. Examples thereof include an electromagnetic brake that applies a braking force.

  According to the first modification, the protruding roller 61 to which the braking force is applied comes into contact with the plate-making image forming portion 35 (see FIG. 4) formed on the plate-making master 21 on the plate cylinder 9, and two points in FIG. While being driven and rotated so as to be dragged counterclockwise as indicated by a chain line, a large number of protrusions 61a penetrate the thermoplastic resin film 21b of the plate-making image forming portion 35 and further enter a depth of about half of the porous support 21a. Since a large number of fine holes are formed at the same time, scratching and scratching damage is given to the plate-making image forming unit 35, so that the plate-making image formed on the plate-making master 21 on the plate cylinder 9 cannot be read more reliably and the plate-making image. Therefore, the pre-printed or used master 21 wound on the plate cylinder 9 can be more securely kept confidential than in the first embodiment.

  In the first embodiment and the first modification, the protrusion roller 61 is formed long in the width direction Wb along the axial direction of the plate cylinder 9, and therefore the parallelism of the outer peripheral surface of the plate cylinder 9 along the axial direction of the plate cylinder 9. It is assumed that the situation cannot be secured. In such a case, since the parallelism along the axial direction of the plate cylinder 9 of the master 21 already made or used on the plate cylinder 9 cannot be secured, the master 21 already made on the plate cylinder 9 or used. The plate-making image may be partially readable in the width direction.

  Therefore, in such a case, the material of the protrusion roller 61 and the shape of the protrusion 61a may be devised. That is, for example, the protrusion roller 61 is formed of an elastic material such as resin or rubber so as to give a certain degree of appropriate elasticity, and the protrusion 61a is formed so as to give a slightly longer elastic force. In order to impart strength and durability, for example, vapor deposition / surface treatment may be performed with stainless steel (SUS). Further, when there is a tendency in the accuracy of the parallelism of the outer peripheral surface of the plate cylinder 9 in the paper width direction Y position (for example, the central part tends to be concave), the cross-sectional shape of the protruding roller 61 (for example, the center) Or the length of the protrusion 61a may be adjusted in accordance with the tendency of the Y position in the paper width direction.

  Further, as described in paragraphs “0092” to “0122” of the above-mentioned Japanese Patent Laid-Open No. 9-14001 and shown in FIGS. 18 and 19, the paper width of the protruding roller 61 is the same as that of the heat generating member (201). The length of the direction Y is shortened, and it is configured to be movable in the paper width direction Y by the same screw mechanism as in the above publication, so that the plate-making image is formed in the width direction of the master 21 on the plate cylinder 9 or used. The forming portion 35 may be scratched while securing a lapping allowance in the same direction so that the forming portion 35 can be surely damaged (since this is the same in the second and third embodiments and the second and third modifications described later). Hereinafter, this description is omitted).

(Second Embodiment)
1 to 4 and 6 show a second embodiment.
Compared with the first embodiment, the second embodiment is a stencil printing apparatus 1 in which the confidentiality mode can be set, and is mainly different in that it includes a master damaging device 60A instead of the master damaging device 60. To do.
The master damaging device 60A has an operation panel 46A shown in FIG. 6 in place of the operation panel 46 as compared with the master damaging device 60 in the first embodiment, and the control means shown in FIG. The main difference is that it has 68A. Other configurations are the same as those of the first embodiment.

The operation panel 46A is different from the operation panel 46 only in that the operation panel 46A has a security mode key 36 as a security mode setting means for setting the security mode of the stencil printing apparatus 1.
Compared with the control unit 68, the control unit 68 </ b> A has the protrusion roller 61 applied to the plate-making image forming unit 35 of the master 21 on the plate cylinder 9 when the security mode is set by pressing the confidential mode key 36. The difference is that the displacement means 67 is controlled so as to come into contact with the main motor 112 so that the plate cylinder 9 rotates.

Based on the above-described configuration, the operation of the second embodiment will be described focusing on differences from the first embodiment.
The first difference is that the plate discharging operation executed when the user presses the plate making start key 47 after setting the plate making conditions with the various keys on the operation panel 46, and the user performs the confidential mode key 36 at the end of the previous printing. If the security mode is not set without pressing the button, the master damaging device 60A is in an inoperative state (the protruding roller 61 remains occupied), and peels off from the outer peripheral surface of the plate cylinder 9. For the used master 21 to be ejected, the prepress image can be read and transferred by the prepress image.

  Similar to the first embodiment, the second difference is that when the set number of prints is consumed, the plate cylinder 9 returns to the home position and stops, and the printing operation is completed. When the security mode is set by the user pressing down the confidential mode key 36 when the plate-making standby state is entered again, the master damaging device is started for the first time in the same manner as in the first embodiment by an instruction from the control means 68A. 60A is in operation.

  Therefore, according to the second embodiment, since the master and ink are not wasted based on winding a new unfinished master around the plate cylinder, troublesome wiring processing is not required and the operation of the master is not performed. By using a simple and highly reliable configuration, the used master 21 accommodated and discarded in the plate release box 30 can be used to ensure the confidentiality of the master 21 that has been made on the plate cylinder 9 or has been used. There is an advantage that can be done. Moreover, when the necessity of confidentiality of the master 21 that has been made is determined by the user and the confidentiality mode is set by pressing the confidential mode key 36, the master damaging device 60A is the same as in the first embodiment. By operating, for example, when performing continuous printing that does not require confidentiality, that is, when performing a series of operations from discharging to printing / discharge processes continuously, the master damaging device 60A is not activated. Since it remains in the state, the total printing time can be shortened compared to the first embodiment.

  Also in the second embodiment, similarly to the first modification, the projection roller 61 is operated in a state where an appropriate braking force is applied, so that scratches and damages are given to the plate-making image forming unit 35, and the plate cylinder Since the plate-making image formed on the plate-making master 21 on the plate 9 cannot be read more reliably and the transfer by the plate-making image cannot be made more reliably, it is wound on the plate cylinder 9 than in the first embodiment. There is an advantage that the confidentiality of the master 21 that has been subjected to plate making or used can be more reliably maintained (hereinafter referred to as “Modification 2”).

(Third embodiment)
1 to 5 show a third embodiment.
The third embodiment is mainly different from the first embodiment in that a master damaging device 60B is used instead of the master damaging device 60.
The master damaging device 60B is mainly different from the master damaging device 60 of the first embodiment in that the master damaging device 60B has control means 68B instead of the control means 68. Other configurations are the same as those of the first embodiment.

Compared with the control means 68, the control means 68B replaces the solenoid pair 65 of the displacement means 67 after the printing on the predetermined number of printed sheets P as shown in FIG. That is, based on a signal relating to the start of the plate removal operation from the plate making start key 47, the displacement means 67 is controlled so that the protruding roller 61 contacts the plate making image forming portion 35 of the used master 21 on the plate cylinder 9. The main difference is that it has a function of controlling the main motor 112 so that the plate cylinder 9 rotates.
Here, “at the time of the plate removal operation” means to include both “immediately before the plate release operation is performed” or “in parallel with the activation of the plate release operation” (also in the sixth embodiment described later). Since this is the same, this description will be omitted below).

Based on the above-described configuration, the operation of the third embodiment will be described with a focus on differences from the first embodiment.
The first difference is that when printing on a predetermined number of sheets of paper P is completed, the main motor 112 is not activated and the displacement means 67 and the protrusion roller 61 are not activated by a command from the control means 68B. It is not in the holding state. That is, the plate cylinder unit can be detached from the apparatus main body 8, and the confidential information related to the plate-making image of the master 21 on the plate cylinder 9 can be read visually or by transfer to a sheet.

  The second difference is that the control means 68B performs the following on the basis of a signal relating to the start of the plate discharge operation generated when the user presses the plate-making start key 47 after setting the plate-making conditions using various keys on the operation panel 46. It is a point which performs control operation like this. That is, the plate cylinder 9 in which the used master 21 is wound around the outer peripheral surface and occupies the home position is clamped by the tip end portion (the clamper 12) of the master 21 when the main motor 112 is activated. When the portion is rotated clockwise in FIG. 2 until reaching the plate discharging position corresponding to the peeling roller 32, the operation is similar to the operations of the solenoid pair 65 and the protruding roller 61 in the first embodiment. Thus, the plate making image of the used master 21 peeled and discharged from the outer peripheral surface of the plate cylinder 9 cannot be read and cannot be transferred by the plate making image, and the plate removing unit 5 can remove the plate making image on the plate cylinder 9. The used master 21 is scratched and damaged to such an extent that the master 21 can be peeled and discharged, and the mesh screen 9b is not damaged.

Therefore, according to the third embodiment, regardless of the necessity of confidentiality of the used master 21, it is accommodated in the plate removal box 30 with a simple configuration which does not require troublesome wiring processing and has high operation reliability. There is an advantage that the confidentiality of the discarded used master 21 can be reliably ensured. In addition, in the third embodiment, after completion of the predetermined printing, the master 21 already made on the plate cylinder 9 is not damaged, so that there is an advantage that additional printing using the master 21 is possible. is there.
Also in the third embodiment, similarly to the first modification, the projection roller 61 is operated in a state where an appropriate braking force is applied, so that scratching damage is given to the plate-making image forming unit 35. There is an advantage that confidentiality of the used master 21 accommodated / discarded in the box 30 can be more reliably maintained (hereinafter referred to as “Modification 3”).

  As described above, in the third embodiment and the third modification, when printing on a predetermined number of sheets of paper P is completed, the plate cylinder unit is detached from the apparatus main body 8 and the plate cylinder 9 on the plate cylinder 9 has been made. Since it is possible to read the confidential information related to the plate-making image of the master 21 by visual recognition or by transfer to a sheet, for example, a plate cylinder lock shown in FIG. The mechanism and the mechanism for engaging and disengaging the gears in the plate cylinder drive mechanism shown in FIG. 6 and the operation panel 46A (secret mode key 36) used in the second embodiment are employed to mount the plate cylinder unit to the apparatus main body 8. It is desirable to keep confidentiality by making it impossible to leave. Yes.

(Fourth embodiment)
A fourth embodiment is shown in FIG. 5, FIG. 7 and FIG.
The fourth embodiment is mainly different from the first embodiment in having a master damaging device 70 instead of the master damaging device 60, and other configurations are the same as those of the first embodiment. . The master damaging device 70 is disposed in the vicinity of the outer peripheral surface of the plate cylinder 9 between the plate conveying roller pair 33 arrangement portion and the peeling claw 37 arrangement portion. 21 is referred to as a file-like member 71 (hereinafter referred to as “file-like blade 71”) as a damaging means for damaging the plate-making image forming portion 35 (region portion shown by hatching in FIG. ) Etc.
Compared with the master damaging device 60, the master damaging device 70 has a filed blade 71 in place of the protruding roller 61, a displacement means 77 in place of the displacing means 67, as shown in FIG. The main difference is that a control means 78 is provided instead of the control means 68.

  That is, as shown in FIG. 7, the master damaging device 70 is configured so as to be able to come into contact with and separate from the master 21 on the plate cylinder 9 and comes into contact with the plate-making image forming section of the master 21 on the plate cylinder 9. A file-shaped blade 71 provided with a file-like projection 71a for damaging it at the tip (lower end in the figure), and a file-making image forming portion of the master 21 on the plate cylinder 9 where the file-shaped blade 71 is made. 7 is moved between a contact position indicated by a two-dot chain line in FIG. 7 and a separation position indicated by a solid line in FIG. After the printing is completed, the displacement means 77 is controlled so that the file-shaped blade 71 contacts the plate-making image forming portion 35 of the master 21 on the plate cylinder 9 so that the plate cylinder 9 rotates. Main motor 11 Is mainly a control unit 78 which controls.

  The file-like blade 71 is made of, for example, a file having a surface (roughness) of # 300. The file number of the file-like projection 71a (shown by the mesh pattern in FIG. 8) of the file-shaped blade 71 is about # 80 to # 1000 from the viewpoint of satisfying the required performance as described in the first embodiment. Is preferred. Here, if the file number of the file-like projection 71a is less than # 80, the thermoplastic resin film 21b of the master 21 that has been scraped off causes clogging, and if it exceeds # 1000, the plate is already made. It is not preferable from the point that it becomes difficult to damage the thermoplastic resin film 21b portion of the master 21. The number of the file-like projection 71a of the file-shaped blade 71 and the pressing force of the file-shaped blade 71 against the master 21 on the plate cylinder 9 (the force applied by the solenoid pair 75 described later) satisfy the above required performance. Detailed design is made to do.

  As the more detailed confidentiality required performance of the file-shaped blade 71, as described in the first embodiment, the dot shape constituting the plate-making image formed on the thermoplastic resin film 21b portion of the plate-making master 21 is provided. Needless to say, it is also set in consideration of the size of the holes and the surface density. In FIG. 8, the width dimension Wc along the sheet width direction Y of the file-like projection 71 a of the file-shaped blade 71 is the width dimension along the sheet width direction Y of the master 21 that has been made around the outer peripheral surface of the plate cylinder 9. And is formed and set longer than the width dimension Wa along the paper width direction Y of the plate-making image forming unit 35 region formed on the plate-making master 21 shown in FIG.

  The displacement unit 77 is mainly different from the displacement unit 67 of the first embodiment in the arrangement state, and the constituent elements thereof are the same. Therefore, the displacement unit 77 of the first embodiment is different from the displacement unit 67 of the first embodiment. Since the numerical value “10” is added to the reference numerals of the constituent elements, the description thereof is omitted as much as possible. The displacement means 77 mainly comprises an arm pair 74 as a swing member, a support shaft 72, a tension spring pair 73 as an urging means, and a solenoid pair 75 as a drive means.

  The arm 74 has a plate shape, and a file-like blade 71 is fixed to one end (the lower end in FIG. 7), and the plunger 75a of the solenoid 75 has a pin 76 at the other end (the upper end in FIG. 7). It is connected loosely through. A support shaft 72 is fixed to a substantially central portion of the arm pair 74 in the vertical direction. Both ends of the arm pair 74 are supported by the side plate pairs 34a and 34b so as to be rotatable by a predetermined angle. One end portion of a tension spring 73 that urges the file blade 71 in a direction that always occupies the separated position is associated between each fixed portion of the file-like blade 71 and each fixed portion of the support shaft 72 in the arm pair 74. It has been stopped. The other end portion of the tension spring pair 73 is locked to a non-illustrated immovable member fixed to the side plate pairs 34a and 34b as explained with reference to FIG. In FIG. 7, illustration of the side plate pairs 34a and 34b is omitted. As described above, the file-like projection 71a at one end of the file-like blade 71 is fixed and supported at one end of the arm pair 74 at a counter angle, whereby the file-like projection 71a of the file-like blade 71 is shown in FIG. The plate-making image forming unit 35 (see FIG. 4) formed on the plate-making master 21 on the plate cylinder 9 rotating in the direction of the arrow (clockwise) is configured to contact at a relatively strong angle.

  The solenoid pair 75 uses the same specification (power consumption, shape and size) and pull type (the same applies to the solenoid pair 75 in fifth and sixth embodiments to be described later). Is omitted). Similarly, the tension spring pair 73 has the same specifications (spring load, shape, etc.) (the tension spring pair 73 in the fifth and sixth embodiments to be described later is also the same). Is omitted).

  Note that the solenoid pair 75 as the driving means and the tension spring pair 73 as the urging means are not limited to this. For example, priority is given to cost reduction of the master damaging device, and the plate cylinder 9 along the sheet width direction Y of the plate cylinder 9 is used. If it is not necessary to have a uniform contact state with the file-shaped blade 71 at both end positions, the solenoid 75 may be disposed only on one of the side plates 34a or 34b (fifth). Since the same applies to the solenoid 75 and the tension spring 73 in the sixth embodiment, the description thereof will be omitted below.

Like the control unit 68 of the first embodiment, the control unit 78 includes, for example, a CPU (not shown), a ROM (not shown) as a storage unit, and a RAM. The input configuration is the same as that of the first embodiment. is there.
Each signal similar to that of the first embodiment input to the CPU of the control means 78 is processed based on an operation program described later stored in the ROM, and the main motor 112 is connected via a motor drive circuit (not shown). In addition, an operation / command signal is output to the solenoid pair 75 via a solenoid drive circuit (not shown) and to the display devices 58 and 59 via a light emitting diode drive circuit and a liquid crystal drive circuit (not shown), respectively. .

  Based on the predetermined print number setting signal set by the numeric keypad 52 and the signal related to the number of printed sheets from the print number counter 128, the control means 78 performs a calculation relating to the remaining number of printed sheets as a result of the predetermined printing. When it is determined that printing on the number of sheets P has been completed, the rotation position (home position) of the plate cylinder 9 is determined based on the signals relating to the rotation position of the plate cylinder 9 from the pulse detection sensor 123 and the home position sensor 126. And the main motor 112 is turned on and controlled so that the plate cylinder 9 rotates at a predetermined number of rotations stored in advance in the ROM, and at this time, a signal relating to the rotational position of the plate cylinder 9 is applied. Based on this, the pair of solenoids is formed so that the file-like projection 71a of the file-shaped blade 71 contacts the plate-making image forming portion 35 of the plate-making master 21 on the plate cylinder 9 and is scratched. 5 the on drive-control, has the function of rasp-like blade 71 is turned off drive and control the solenoid pair 75 so as not to interfere with the clamper 12 disposed portion of the plate cylinder 9.

Based on the above-described configuration, the operation of the fourth embodiment will be described below with a focus on differences from the first embodiment.
The user sets a document 69 to be printed on the image reading unit 7, sets the platemaking conditions using various keys on the operation panel 46, and then presses the platemaking start key 47.
When the plate making start key 47 is pressed, first, a plate discharging operation is performed in the plate discharging unit 5 for peeling and discharging the used master 21 from the outer peripheral surface of the plate cylinder 9 used in the previous printing. In the present embodiment, the used master 21 that is peeled and discharged from the outer peripheral surface of the plate cylinder 9 by the plate discharging operation is already applied to the plate cylinder 9 by the operation of the master damaging device 70 as described in detail later. Used master on the plate cylinder 9 by the plate removing unit 5 to such an extent that the plate-making image formed on the master-made master 21 is not readable and cannot be transferred by the plate-making image. The screen 21 is scratched to such an extent that the screen 21 can be peeled and discharged, and the mesh screen 9b is not damaged.

As will be described later, the solenoid pair 75 is not energized by a command from the control means 78 until the end of normal printing for a predetermined number of printed sheets, and the solenoid pair 75 is turned off in a non-excited state. Due to the urging force of 73, the file-like blade 71 supported on one end of the arm pair 74 occupies a separated position and is held at the same position as shown in FIG.
The plate cylinder 9 on which the used master 21 that has already been damaged as described above is wound around the outer peripheral surface is clamped by the clamper 12 at the leading end of the master 21 when the main motor 112 is activated. The portion is rotated until it reaches the plate discharging position corresponding to the peeling roller 32, and the same plate discharging operation as in the first embodiment, the reading operation of the original 69 by the image reading unit 7, the plate making operation, the plate feeding The operation, the printing operation, the test printing operation that is appropriately executed, and the regular printing operation are performed.

  When the set number of prints is exhausted by the regular printing operation, the plate cylinder 9 returns to the home position again and stops, the printing operation is completed, and the stencil printing apparatus 1 enters the plate making standby state again. At this time, the control means 78 performs a calculation relating to the remaining number of prints based on a predetermined print number setting signal set by the numeric keypad 52 and a signal relating to the number of printed sheets from the print number counter 128, and the remaining print number is calculated. The number of sheets is displayed on the display device 58. Then, when the control means 78 determines that printing on the predetermined number of sheets of paper P has been completed, based on the signals relating to the rotational position of the plate cylinder 9 from the pulse detection sensor 123 and the home position sensor 126, the plate After recognizing that the rotational position of the cylinder 9 occupies the home position, the main motor 112 is activated so that the plate cylinder 9 rotates clockwise at a rotational peripheral speed as low as or slightly faster than that at the time of printing. Begin to.

  The control means 78 refers to the rotational position signal of the main motor 112 detected by the pulse detection sensor 123 and transmitted through the pulse counter and the comparator, and the clamper 12 placement portion of the plate cylinder 9 faces the file blade 71. The solenoid pair 75 of the displacement means 77 is rotated at the rotational position of the plate cylinder 9 that has passed the position to be moved, that is, at the rotational position of the plate cylinder 9 where the tip of the used master 21 on the plate cylinder 9 is substantially opposite to the file blade 71. This is turned on to energize. When the solenoid pair 75 is energized and turned on, the plunger 75a connected to the other end of the arm pair 74 is pulled leftward in FIG. The blade 71 oscillates and is displaced counterclockwise about the support shaft 72 in FIG. 7 against the urging force of the tension spring pair 73 and occupies the contact position.

  When the file-shaped blade 71 occupies the contact position, the file-shaped projection 71a of the file-shaped blade 71 has a plate-making image forming section 35 (formed on the plate-making master 21 on the plate cylinder 9 that rotates clockwise in FIG. 4) and penetrates the thermoplastic resin film 21b of the plate-making image forming portion 35, and further penetrates to about half the depth of the porous support 21a to form a large number of fine scratches. 9 to the extent that the plate-making image formed on the plate-making master 21 on the plate 9 cannot be read and cannot be transferred by the plate-making image. The master 21 is scratched and damaged to such an extent that the master 21 can be peeled and discharged, and the mesh screen 9b is not damaged.

  Here, the number of times the file-shaped blade 71 is pressed against the plate-making image forming unit 35 of the used master 21 on the plate cylinder 9, in other words, the plate cylinder 9 is rotated a plurality of times to move the file-shaped blade 71 on the plate cylinder 9. The number of times of abutting and pressing on the plate-making image forming unit 35 of the plate-making master 21 can be arbitrarily set as desired by the user as described in the first embodiment. That is, depending on the contents of the operation program of the ROM, or by using a PROM (programmable read-only storage device) instead of the ROM, the master damaging device 70 is operated over a plurality of rotations of the plate cylinder 9. In this case, the control means 78 refers to the rotational position signal of the main motor 112 detected by the pulse detection sensor 123 and transmitted through the pulse counter and the comparator, and the plate cylinder In the rotational position of the plate cylinder 9 before passing the position where the 9 clamper 12 arrangement portion faces the file-shaped blade 71, the energization to the solenoid pair 75 is turned off, so that the file-shaped blade is energized by the urging force of the tension spring pair 73. 71 occupies the separated position, and interference between the file-like blade 71 and the clamper 12 placement portion can be avoided. . As described above, when the master damaging device 70 is operated over a plurality of rotations of the plate cylinder 9, the file-shaped blade 71 causes the master damaging device 70 to move on the plate cylinder 9 as compared with the case where the master damaging device 70 is operated only for one rotation of the plate cylinder 9. By forming a large number of fine scratch scratches on the used master 21, scratch scratches are uniformly applied, and the surface density of the scratch scratches is increased, so that the master 21 on the plate cylinder 9 is formed. The plate-making image thus made cannot be read more reliably and the transfer by the plate-making image cannot be made more reliable, so that the confidentiality of the plate-making or used master 21 wound on the plate cylinder 9 is more reliably secured. You can do it.

  The plate cylinder 9 is not limited to this and may not have the mesh screen 9b. As described above, in the case of a plate cylinder substantially consisting only of the porous support plate 9a, the print quality requirement performance that should be provided in the file-shaped blade 71 of the master damaging device 70, that is, “to the extent that the mesh screen 9b is not damaged. Is unnecessary (the same applies to fifth and sixth embodiments to be described later, and hence this description is omitted below).

Therefore, according to the fourth embodiment, there are advantages similar to those of the first embodiment.
In the fourth embodiment, since the file-shaped blade 71 is formed long in the width dimension Wc along the axial direction of the plate cylinder 9, the parallelism of the outer peripheral surface of the plate cylinder 9 along the axial direction of the plate cylinder 9 cannot be ensured. Such a case is assumed. In such a case, since the parallelism along the axial direction of the plate cylinder 9 of the master 21 already made or used on the plate cylinder 9 cannot be secured, the master 21 already made on the plate cylinder 9 or used. The plate-making image may be partially readable in the width direction.
Therefore, in such a case, the material of the file blade 71 and the shape of the file projection 71a may be devised. That is, for example, the material of the file blade 71 may be formed of an elastic material such as resin or thin sheet metal so as to give a certain degree of appropriate elasticity. In addition, when there is a tendency in the accuracy of the parallelism by the Y position of the outer periphery of the plate cylinder 9 (for example, the central part tends to be concave), the cross-sectional shape of the file-like blade 71 (for example, its The central portion may be convex), or the length of the file-like projection 71a may be adjusted according to the tendency of the Y position in the paper width direction.

  Further, as described in paragraphs “0092” to “0122” of the above-mentioned Japanese Patent Application Laid-Open No. 9-14001 and shown in FIGS. 18 and 19, the paper of the file-like blade 71 is the same as the heat generating member (201). The length in the width direction Y is shortened, and it is configured to be movable in the sheet width direction Y by a screw mechanism similar to that in the above publication, so that plate making is performed in the width direction of the master 21 on the plate cylinder 9 or used. The image forming unit 35 may be scratched while securing a lapping allowance in the same direction so that the image forming unit 35 can be surely damaged (this is the same in the fifth and sixth embodiments to be described later. Is omitted).

(Fifth embodiment)
6 to 8 show a fifth embodiment.
Compared with the fourth embodiment, the fifth embodiment is a stencil printing apparatus 1 in which the security mode can be set, and is mainly different in that a master damaging device 70A is substituted for the master damaging device 70. To do.
Compared with the master damaging device 70 of the fourth embodiment, the master damaging device 70A has an operation panel 46A shown in FIG. 6 in place of the operation panel 46, and the control means shown in FIG. The main difference is that it has 78A. Other configurations are the same as those of the fourth embodiment.

  Compared with the control means 78, the control means 78A has a plate-making image of the master 21 on which the one end of the file-like blade 71 is made on the plate cylinder 9 when the security mode is set by pressing the confidential mode key 36. The difference is that the displacement means 77 is controlled so as to come into contact with the forming portion 35 and the main motor 112 is controlled so that the plate cylinder 9 rotates.

Based on the above-described configuration, the operation of the fifth embodiment will be described focusing on differences from the fourth embodiment.
The first difference is that the plate discharging operation executed when the user presses the plate making start key 47 after setting the plate making conditions with the various keys on the operation panel 46, and the user performs the confidential mode key 36 at the end of the previous printing. When the security mode is not set without pressing down, the master damaging device 70A is in the non-operating state (the state where the file-shaped blade 71 occupies the separated position), and from the outer peripheral surface of the plate cylinder 9 The used master 21 to be peeled and discharged is capable of reading the plate-making image and transferring it with the plate-making image.

  The second difference is that, as in the fourth embodiment, when the set number of prints is consumed, the plate cylinder 9 returns to the home position again and stops, the printing operation is completed, and the stencil printing apparatus 1 If the security mode is set by pressing the confidential mode key 36 when the user enters the plate-making standby state again, the master damaging device is started for the first time in the same manner as in the fourth embodiment by an instruction from the control means 78A. 70A is in operation.

  Therefore, according to the fifth embodiment, since the master and ink are not wasted based on winding a new unfinished master around the plate cylinder, troublesome wiring processing is unnecessary and the operation is not performed. By using a simple and highly reliable configuration, the used master 21 accommodated and discarded in the plate release box 30 can be used to ensure the confidentiality of the master 21 that has been made on the plate cylinder 9 or has been used. There is an advantage that can be done. In addition, when the necessity of confidentiality of the master 21 that has been made is determined by the user and the confidentiality mode is set by pressing the confidential mode key 36, the master damaging device 70A is the same as in the fourth embodiment. By operating, for example, when continuous printing that does not require confidentiality is performed, that is, when a series of operations from discharging to printing / discharge processes are continuously performed, the master damaging device 70A is not operated. Since it remains in the state, the total printing time can be shortened compared to the fourth embodiment.

(Sixth embodiment)
5, 6 and 8 show a sixth embodiment.
The sixth embodiment is mainly different from the fourth embodiment in that a master damaging device 70B is used instead of the master damaging device 70.
The master damaging device 70B is mainly different from the master damaging device 70 of the fourth embodiment in that it includes control means 78B instead of the control means 78. Other configurations are the same as those of the fourth embodiment.

  Compared with the control means 78, the control means 78B, as shown in FIG. 2, replaces the solenoid pair 75 of the displacement means 77 after the printing on the predetermined number of sheets of paper P, instead of operating the solenoid pair 75. That is, based on a signal related to the start of the plate removal operation from the plate making start key 47, the displacement means 77 is arranged so that one end of the file-like blade 71 contacts the plate making image forming portion 35 of the used master 21 on the plate cylinder 9. The main difference is that it has a function of controlling the main motor 112 so that the plate cylinder 9 rotates.

Based on the above-described configuration, the operation of the sixth embodiment will be described focusing on differences from the fourth embodiment.
The first difference is that when the printing on the predetermined number of sheets of paper P is completed, the main motor 112 is not activated and the displacement means 77 and the file-like blade 71 are not operated by a command from the control means 78B. It is not in a confidential state. That is, the plate cylinder unit can be detached from the apparatus main body 8, and the confidential information related to the plate-making image of the master 21 on the plate cylinder 9 can be read visually or by transfer to a sheet.

  The second difference is that the control means 78B performs the following on the basis of a signal relating to the start of the plate discharging operation generated when the user presses the plate making start key 47 after setting the plate making conditions with various keys on the operation panel 46. It is a point which performs control operation like this. That is, the plate cylinder 9 in which the used master 21 is wound around the outer peripheral surface and occupies the home position is clamped by the tip end portion (the clamper 12) of the master 21 when the main motor 112 is activated. When the part) is rotated clockwise in FIG. 7 until it reaches the plate discharging position corresponding to the peeling roller 32, the same operation as that of the solenoid pair 75 and the file blade 71 in the fourth embodiment is performed. Accordingly, the plate cylinder 9 is peeled off from the outer peripheral surface of the plate cylinder 9 so that the plate-making image of the used master 21 cannot be read and cannot be transferred by the plate-making image, and the plate cylinder 9 is moved by the plate discharging unit 5. The used master 21 is scratched and damaged to such an extent that the used master 21 can be peeled and discharged, and the mesh screen 9b is not damaged.

Therefore, according to the sixth embodiment, regardless of the necessity of confidentiality of the used master 21, it is accommodated in the plate removal box 30 with a simple configuration that does not require troublesome wiring processing and has high operation reliability. There is an advantage that the confidentiality of the discarded used master 21 can be reliably ensured. In addition, in the sixth embodiment, after the completion of the predetermined printing, the master 21 on the plate cylinder 9 is not yet damaged, so that an additional printing using the master 21 is possible. is there.
As described above, in the sixth embodiment, when printing on a predetermined number of sheets of paper P is completed, the plate cylinder unit is detached from the apparatus main body 8 and the plate making of the master 21 on the plate cylinder 9 is completed. Since it is possible to read the confidential information relating to the image by visual recognition or by transfer to a sheet, for example, a plate cylinder lock mechanism shown in FIG. 4 of Japanese Patent Laid-Open No. 9-14001 and FIG. In the plate cylinder drive mechanism shown in FIG. 4, the gear engagement / disengagement mechanism and the operation panel 46A (confidential mode key 36) used in the fifth embodiment are employed so that the plate cylinder unit cannot be detached from the apparatus body 8. It is desirable to ensure confidentiality by doing so.

(Modification 4)
FIG. 9 shows a fourth modification of the fourth embodiment.
In the modified example 4, as compared with the fourth embodiment, the file-like projection 71a at one end of the file-like blade 71 is fixed and supported at one end of the arm pair 74 at the pressing angle shown in FIG. Is different. As a result, the file-shaped projection 71a of the file-shaped blade 71 causes the plate-making image forming portion 35 (see FIG. 4) formed on the plate-making master 21 on the plate cylinder 9 rotating in the direction of the arrow (clockwise) in FIG. Moreover, although it contacts weakly compared with the case shown in FIG. 7, the same advantage as 4th Embodiment is acquired. Modification 4 can be applied to the fifth and sixth embodiments, and the same advantages as those of the fifth and sixth embodiments can be obtained.

(Modification 5)
7, 9, and 10 show a fifth modification of the fourth embodiment.
In the modified example 5, as compared with the fourth embodiment, instead of the file-shaped blade 71, a plate-making image forming unit of the plate-making master 21 on the plate cylinder 9 as shown by reference numerals in parentheses in FIG. It is different from the sawtooth member 79 (hereinafter referred to as “sawtooth blade 79”) provided with a sawtooth projection 79a for contacting and damaging 35 (see FIG. 4).

  The serrated blade 79 is formed, for example, with a height Ha of 1 mm from the base and a pitch La of 1 mm. In FIG. 10, the height Ha from the base portion of the serrated projection 79a of the serrated blade 79 satisfies the same required performance as described in the first embodiment, but the range of 0.1 mm or more is serrated. The pitch La between the protrusions 79a is preferably in the range of 1 to 5 mm. Here, when the height Ha of the sawtooth projection 79a is less than 0.1 mm and the pitch La is less than 1 mm, the sawtooth-shaped master 21 of the master 21 that has been scraped off causes clogging, and the sawtooth If the pitch La of the protrusions 79a exceeds 5 mm, it is not preferable because the effect of preventing leakage of confidential information is reduced. The height Ha of the serrated projection 79a of the serrated blade 79, the pitch La, and the pressing force of the serrated blade 79 against the master 21 on the plate cylinder 9 (the pressing force by the solenoid pair 75) satisfy the above required performance. Detailed design is made to do.

  In FIG. 10, the width dimension Wd of the serrated blade 79 along the sheet width direction Y is shorter than the width dimension along the sheet width direction Y of the plate-making master 21 wound around the outer peripheral surface of the plate cylinder 9, and 4 is formed and set longer than the width dimension Wa along the paper width direction Y of the plate-making image forming portion 35 area formed on the plate-making master 21 shown in FIG. Modification 5 can also be applied to the fifth and sixth embodiments, and the same advantages as those of the fifth and sixth embodiments can be obtained.

(Seventh embodiment)
FIG. 11 shows a seventh embodiment.
The seventh embodiment is mainly different from the first embodiment in having a master damaging device 80 instead of the master damaging device 60, and the other configuration is the same as that of the first embodiment. . The master damaging device 80 is disposed in the vicinity of the outer peripheral surface of the plate cylinder 9 between the plate conveying roller pair 33 arrangement portion and the peeling claw 37 arrangement portion. Heating wire 81 and the like as damage means for damaging 21 plate-making image forming portion 35 (region portion shown by hatching in FIG. The master damaging device 80 is not limited to the above-described arrangement position, and when it is desired to reduce the amount of rotation of the plate cylinder 9, a position close to the upstream home position in the rotation direction (clockwise) of the plate cylinder 9 is preferable. It may be disposed near the outer peripheral surface of the plate cylinder 9 between the portion 3 and the registration roller pair 27 (the same applies to the eighth and ninth embodiments described later).

Compared with the master damaging device 60, the master damaging device 80 has a heating wire 81 in place of the protruding roller 61, and the displacement means 67 is removed so that the heating wire 81 always avoids interference from the clamper 12 placement portion. The main difference is that it is arranged and held in the vicinity of the outer side away from the outer peripheral surface of the plate cylinder 9 as a position, and that it has a control means 82 instead of the control means 68.
That is, the master damaging device 80 radiates heat (heat radiation) to the master 21 on the plate cylinder 9 and heat-shrinks and damages the master 21 and the heat line from the heating wire 81 is transferred to the plate cylinder. 9 and a heating plate driving circuit (not shown) so that the heating wire 81 generates heat after the printing on the predetermined number of sheets of paper P is finished. The control unit 82 mainly controls the power source and controls the main motor 112 so that the plate cylinder 9 rotates.

The heating wire 81 is formed of a nichrome wire, for example. The thermal energy radiated from the heating wire 81 to the master 21 that has been made on the plate cylinder 9 satisfies the required performance similar to that described in the first embodiment, that is, the thermoplastic resin film 21b portion. From the surface of the plate-making master 21 on the plate cylinder 9 at 80 ° C. or higher (provided that the thermoplastic resin film 21b is a polyester resin) 200 ° C. The current / power supplied to the heating wire 81 from the heating wire driving circuit is set so as to be within the range.
The width dimension along the sheet width direction Y of the heating wire 81 is shorter than the width dimension along the sheet width direction Y of the master 21 that has been made on the outer periphery of the plate cylinder 9 and is shown in FIG. It is formed and set longer than the width dimension Wa along the sheet width direction Y of the plate-making image forming portion 35 area formed on the plate-making master 21.

Like the control unit 68 of the first embodiment, the control unit 82 includes, for example, a CPU (not shown) and a ROM and RAM (not shown) as storage units, and the input configuration is the same as that of the first embodiment. is there.
Each signal similar to that of the first embodiment input to the CPU of the control means 82 is processed based on an operation program described later stored in the ROM, and the main motor 112 is connected via a motor drive circuit (not shown). In addition, they are output as operation / command signals to the heating wire 81 via the heating wire driving circuit and to the display devices 58 and 59 via a light emitting diode driving circuit and a liquid crystal driving circuit (not shown), respectively. .

  Based on the predetermined print number setting signal set by the numeric keypad 52 and the signal related to the number of printed sheets from the print number counter 128, the control unit 82 performs the calculation related to the remaining number of printed sheets as a result of the calculation. When it is determined that printing on the number of sheets P has been completed, the rotation position (home position) of the plate cylinder 9 is determined based on the signals relating to the rotation position of the plate cylinder 9 from the pulse detection sensor 123 and the home position sensor 126. And the main motor 112 is turned on and controlled so that the plate cylinder 9 rotates at a predetermined number of rotations stored in advance in the ROM, and at this time, a signal relating to the rotational position of the plate cylinder 9 is applied. On the basis of this, the function is turned on so as to supply current / power to the heating wire 81, and the supply of current / power to the heating wire 81 is turned off after the predetermined rotation of the plate cylinder 9 (after the master is damaged). A.

Based on the above-described configuration, the operation of the seventh embodiment will be described below with a focus on the difference from that of the first embodiment.
The user sets a document 69 to be printed on the image reading unit 7, sets the platemaking conditions using various keys on the operation panel 46, and then presses the platemaking start key 47.
When the plate making start key 47 is pressed, first, a plate discharging operation is performed in the plate discharging unit 5 for peeling and discharging the used master 21 from the outer peripheral surface of the plate cylinder 9 used in the previous printing. In the present embodiment, the used master 21 that is peeled and discharged from the outer peripheral surface of the plate cylinder 9 by the plate discharging operation is already applied to the plate cylinder 9 by the operation of the master damaging device 80 as described in detail later. Used master on the plate cylinder 9 by the plate removing unit 5 to such an extent that the plate-making image formed on the master-made master 21 is not readable and cannot be transferred by the plate-making image. The thermoplastic resin film 21b portion of the plate-making image forming unit 35 is thermally contracted and damaged to such an extent that the plate 21 can be peeled and discharged, and the mesh screen 9b is not damaged.

As will be described later, until the end of regular printing for a predetermined number of printed sheets, no current flows through the heating wire 81 according to a command from the control means 82, and the heating wire 81 is in a non-heated state as shown in FIG. Remains in place.
The plate cylinder 9 on which the used master 21 that has already been damaged as described above is wound around the outer peripheral surface is clamped by the clamper 12 at the leading end of the master 21 when the main motor 112 is activated. The portion is rotated until it reaches the plate discharging position corresponding to the peeling roller 32, and the same plate discharging operation as in the first embodiment, the reading operation of the original 69 by the image reading unit 7, the plate making operation, the plate feeding The operation, the printing operation, the test printing operation that is appropriately executed, and the regular printing operation are performed.

When the set number of prints is exhausted by the regular printing operation, the plate cylinder 9 returns to the home position again and stops, the printing operation is completed, and the stencil printing apparatus 1 enters the plate making standby state again. At this time, the control means 82 performs a calculation related to the remaining number of prints based on a predetermined print number setting signal set by the numeric keypad 52 and a signal related to the number of printed sheets from the print number counter 128, and the remaining print number is calculated. The number of sheets is displayed on the display device 58. Then, when the control means 82 determines that printing on the predetermined number of sheets of paper P has been completed, the control means 82 is based on the signals relating to the rotational position of the plate cylinder 9 from the pulse detection sensor 123 and the home position sensor 126. After recognizing that the rotational position of the cylinder 9 has occupied the home position, the main motor 112 is activated to start the plate cylinder 9 rotating clockwise, for example, at the same rotational peripheral speed as that at the time of printing.
The control means 82 refers to the rotational position signal of the main motor 112 detected by the pulse detection sensor 123 and transmitted through the pulse counter and the comparator, and the clamper 12 arrangement portion of the plate cylinder 9 faces the heating wire 81. At the rotational position of the plate cylinder 9 past the position, that is, at the rotational position of the plate cylinder 9 where the tip of the used master 21 on the plate cylinder 9 is substantially opposite to the heating wire 81, current flows through the heating wire 81 to generate heat. A current is applied to the heating wire 81 at a timing at which the temperature is increased and the plate-making image forming unit 35 (see FIG. 4) of the used master 21 on the plate cylinder 9 can be damaged by the above-described thermal contraction. The heating wire driving circuit is turned on so as to flow.

When the heating wire 81 is heated and heated to a predetermined temperature, the heating wire is applied to the plate-making image forming unit 35 (see FIG. 4) formed on the plate-making master 21 on the plate cylinder 9 that rotates clockwise in FIG. , The plate-making image forming unit 35 (see FIG. 4) of the used master 21 on the plate cylinder 9 is damaged due to the above-described thermal contraction, so that the plate-making master 21 on the plate cylinder 9 is damaged. The used master 21 on the plate cylinder 9 is peeled and discharged by the plate discharging unit 5 to such an extent that the plate-making image formed on the printing plate cannot be read and cannot be transferred by the plate-making image. It will be damaged to such an extent that the mesh screen 9b is not damaged.
Here, by rotating the plate cylinder 9 a plurality of times, the plate-making image forming portion 35 (see FIG. 4) of the used master 21 on the plate cylinder 9 is more sufficiently heat-shrinked by the heat rays from the heating wire 81. Of course, it can also be damaged. Therefore, in the seventh embodiment, the same advantages as those in the first embodiment can be obtained.

(Eighth embodiment)
FIG. 11 shows an eighth embodiment.
The eighth embodiment is mainly different from the seventh embodiment in that the stencil printing apparatus 1 is capable of setting the security mode and has a master damaging device 80A instead of the master damaging device 80. To do.
The master damaging apparatus 80A has an operation panel 46A shown in FIG. 6 in place of the operation panel 46 and a control means 82A in place of the control means 82, as compared with the master damaging apparatus 80 of the seventh embodiment. Is mainly different. Other configurations are the same as those of the seventh embodiment.

  Compared with the control unit 82, the control unit 82A controls a heating line driving circuit and a power source (not shown) so that the heating line 81 generates heat when the confidential mode is set by pressing the confidential mode key 36. The difference is that it has a function of controlling the main motor 112 so that the plate cylinder 9 rotates.

Based on the above-described configuration, the operation of the eighth embodiment will be described focusing on differences from the seventh embodiment.
The first difference is that the plate discharging operation executed when the user presses the plate making start key 47 after setting the plate making conditions with the various keys on the operation panel 46, and the user performs the confidential mode key 36 at the end of the previous printing. If the security mode is not set without pressing the key, the master damaging device 80A is in the non-operating state (the heating wire 81 remains in the non-heated state), and peeling and discharging from the outer peripheral surface of the plate cylinder 9 are performed. As for the used master 21, the prepress image can be read and transferred by the prepress image.

  The second difference is that, similarly to the seventh embodiment, when the set number of prints is consumed, the plate cylinder 9 returns to the home position and stops, the printing operation is completed, and the stencil printing apparatus 1 When the security mode is set by pressing the confidential mode key 36 when the user enters the plate-making standby state again, the heating wire 81 is started for the first time in the same manner as in the seventh embodiment by an instruction from the control means 82A. Is that it generates heat.

  Therefore, according to the eighth embodiment, there are advantages similar to those of the seventh embodiment. Moreover, when the necessity of confidentiality of the master 21 that has been made is determined by the user and the confidentiality mode is set by pressing the confidential mode key 36, the master damaging device 80A is the same as in the seventh embodiment. By operating, for example, when performing continuous printing that does not require confidentiality, that is, when performing a series of operations from discharging to printing / discharge processes continuously, the master damaging device 80A is not activated. Since it remains in the state, the total printing time can be shortened compared to the seventh embodiment.

(Ninth embodiment)
FIG. 11 shows a ninth embodiment.
The ninth embodiment is mainly different from the seventh embodiment in that a master damaging device 80B is used instead of the master damaging device 80.
The master damaging device 80B is mainly different from the master damaging device 80 of the seventh embodiment in that it includes control means 82B instead of the control means 82. Other configurations are the same as those of the seventh embodiment.

Compared with the control means 82, the control means 82 B replaces the heating wire 81 with a heat generation operation after the printing on the predetermined number of sheets of paper P is completed. Based on the signal related to the start-up, the heating wire driving circuit and the power source (not shown) are controlled so that the heating wire 81 generates heat, and the main motor 112 is controlled so that the plate cylinder 9 rotates. Is different.
Here, “at the time of the plate removal operation” means “until the plate removal operation is performed, a current flows through the heating wire 81 to generate heat and the temperature is increased and the plate making image forming unit 35 of the used master 21 on the plate cylinder 9 is used. (Refer to FIG. 4) means a time when the temperature reaches a temperature at which the above-described thermal contraction can occur and be damaged.

Based on the above-described configuration, the operation of the ninth embodiment will be described focusing on differences from the seventh embodiment.
The first difference is that when printing on a predetermined number of sheets of paper P is completed, the main motor 112 is not activated and the heating wire 81 is not heated by a command from the control means 82B. The used master 21 that is peeled and discharged from the outer peripheral surface of the plate cylinder 9 can read the plate-making image and can be transferred by the plate-making image, and is not in a confidential state.

  The second difference is that the control means 82B performs the following on the basis of a signal relating to the start of the plate discharging operation generated when the user presses the plate making start key 47 after setting the plate making conditions with various keys on the operation panel 46. It is a point which performs control operation like this. That is, the rotational position of the plate cylinder 9 past the position where the clamper 12 arrangement portion of the plate cylinder 9 faces the heating wire 81, that is, the tip of the used master 21 on the plate cylinder 9 almost faces the heating wire 81. At the rotational position of the plate cylinder 9, an electric current flows through the heating wire 81 to generate heat and temperature, and the plate-making image forming unit 35 (see FIG. 4) of the used master 21 on the plate cylinder 9 causes the above-described thermal contraction. The heating wire driving circuit is turned on so that a current flows through the heating wire 81 at a timing at which the temperature can be damaged.

  Therefore, according to the ninth embodiment, regardless of whether the used master 21 is confidential, it is accommodated in the discharge box 30 with a simple configuration that does not require troublesome wiring processing and has high operation reliability. There is an advantage that the confidentiality of the discarded used master 21 can be reliably ensured. In addition, in the ninth embodiment, after completion of predetermined printing, since the master 21 already made on the plate cylinder 9 is not damaged, there is an advantage that additional printing using the master 21 is possible. is there.

(Tenth embodiment)
FIG. 12 shows a tenth embodiment.
The tenth embodiment is mainly different from the ninth embodiment in having a master damaging device 90 instead of the master damaging device 80, and other configurations are the same as those of the ninth embodiment. . The master damaging device 90 is disposed in the vicinity of the outer peripheral surface of the plate cylinder 9 between the plate conveying roller pair 33 arrangement portion and the peeling claw 37 arrangement portion. Heating wire 81 and the like as damage means for damaging 21 plate-making image forming portion 35 (region portion shown by hatching in FIG. The master damaging device 90 is not limited to the above arrangement position, and may be arranged near the outer peripheral surface of the plate cylinder 9 between the plate making unit 3 and the registration roller pair 27, for example.
The master damaging device 90 is mainly different from the master damaging device 80 in that it has a laser irradiation device 91 in place of the heating wire 81 and a control means 93 in place of the control means 82.

  That is, the master damaging device 90 irradiates the plate making image forming unit 35 (see FIG. 4) of the plate making master 21 on the plate cylinder 9 with a laser beam 92 and thermally contracts the laser beam 92 to cause damage. Both a laser irradiation device 91 as a means and a laser driving circuit (not shown) so that the laser irradiation device 91 drives the laser beam 92 to irradiate the laser beam 92 after the printing on the predetermined number of sheets of paper P is completed. And a control means 93 for controlling the main motor 112 so that the plate cylinder 9 rotates.

The laser irradiation device 91 is arranged and fixed in the vicinity of the outer peripheral surface of the plate cylinder 9 between the plate conveying roller pair 33 arrangement portion and the peeling claw 37 arrangement portion. As the laser irradiation apparatus 91, for example, a laser diode is provided. The laser beam output energy irradiated from the laser irradiation device 91 to the master 21 on the plate cylinder 9 satisfies the same required performance as described in the first and ninth embodiments, that is, heat. From the viewpoint of heat-shrinking the plastic resin film 21b, the color of the ink filled between the mesh screen 9b of the plate cylinder 9 and the master 21 that has been made on the mesh screen 9b and that has been made on the mesh screen 9b (normally Is black, but the color is changed to red, yellow, blue, etc. In the case of multicolor stencil printing machines, the color of ink is changed for each plate cylinder) The output energy is changed so that
The width of the laser beam 92 irradiated from the laser irradiation device 91 is shorter than the width dimension along the sheet width direction Y of the master 21 that has been preliminarily wound around the outer peripheral surface of the plate cylinder 9, and is shown in FIG. In addition, it is formed and set longer than the width dimension Wa along the sheet width direction Y of the plate-making image forming portion 35 area formed on the plate-making master 21.

Similarly to the control unit 68 of the ninth embodiment, the control unit 93 includes a CPU (not shown), a ROM (not shown) as a storage unit, and a RAM, and the input configuration is the same as that of the ninth embodiment. is there.
The same signals as those of the ninth embodiment input to the CPU of the control means 93 are processed based on an operation program described later stored in the ROM, and the main motor 112 is connected via a motor drive circuit (not shown). In addition, they are output as operation / command signals to the laser irradiation device 91 via the laser driving circuit and to the display devices 58 and 59 via a light emitting diode driving circuit and a liquid crystal driving circuit (not shown), respectively. .

  Based on the predetermined print number setting signal set by the numeric keypad 52 and the signal related to the number of printed sheets from the print number counter 128, the control means 93 performs a calculation relating to the remaining number of printed sheets as a result of the calculation. When it is determined that printing on the number of sheets P has been completed, the rotation position (home position) of the plate cylinder 9 is determined based on the signals relating to the rotation position of the plate cylinder 9 from the pulse detection sensor 123 and the home position sensor 126. And the main motor 112 is turned on and controlled so that the plate cylinder 9 rotates at a predetermined number of rotations stored in advance in the ROM, and at this time, a signal relating to the rotational position of the plate cylinder 9 is applied. Based on this, the laser irradiation device 91 is turned on to drive, and after the predetermined rotation of the plate cylinder 9 is completed (after the master is damaged), the laser irradiation device 91 is turned off.

Based on the above-described configuration, the operation of the tenth embodiment will be described below with a focus on differences from the ninth embodiment.
The user sets a document 69 to be printed on the image reading unit 7, sets the platemaking conditions using various keys on the operation panel 46, and then presses the platemaking start key 47.
When the plate making start key 47 is pressed, first, a plate discharging operation is performed in the plate discharging unit 5 for peeling and discharging the used master 21 from the outer peripheral surface of the plate cylinder 9 used in the previous printing. In the present embodiment, the used master 21 that is peeled and discharged from the outer peripheral surface of the plate cylinder 9 by the plate discharging operation is already on the plate cylinder 9 by the operation of the master damaging device 90 as will be described in detail later. Used master on the plate cylinder 9 by the plate removing unit 5 to such an extent that the plate-making image formed on the master-made master 21 is not readable and cannot be transferred by the plate-making image. The thermoplastic resin film 21b portion of the plate-making image forming unit 35 is thermally contracted and damaged to such an extent that the plate 21 can be peeled and discharged, and the mesh screen 9b is not damaged.

As will be described later, the laser irradiation device 91 is not driven by a command from the control means 93 until the predetermined number of printed sheets are finished, and the laser irradiation device 91 is in a non-driven state as shown in FIG. Is still held.
The plate cylinder 9 on which the used master 21 that has already been damaged as described above is wound around the outer peripheral surface is clamped by the clamper 12 at the leading end of the master 21 when the main motor 112 is activated. Part) is rotated until it reaches a plate discharging position corresponding to the peeling roller 32, and the same plate discharging operation as in the ninth embodiment, reading operation of the original 69 by the image reading unit 7, plate making operation, plate feeding The operation, the printing operation, the test printing operation that is appropriately executed, and the regular printing operation are performed.

  When the set number of prints is exhausted by the regular printing operation, the plate cylinder 9 returns to the home position again and stops, the printing operation is completed, and the stencil printing apparatus 1 enters the plate making standby state again. At this time, the control means 93 performs calculation related to the remaining number of prints based on a predetermined print number setting signal set by the numeric keypad 52 and a signal related to the number of printed sheets from the print number counter 128, and the remaining print number The number of sheets is displayed on the display device 58. Then, when the control means 93 determines that printing on the predetermined number of sheets of paper P has been completed, the control means 93 is based on the signals relating to the rotational position of the plate cylinder 9 from the pulse detection sensor 123 and the home position sensor 126. After recognizing that the rotational position of the cylinder 9 has occupied the home position, the main motor 112 is activated to start the plate cylinder 9 rotating clockwise, for example, at the same rotational peripheral speed as that at the time of printing.

The control means 93 refers to the rotation position signal of the main motor 112 detected by the pulse detection sensor 123 and transmitted through the pulse counter and the comparator, and the clamper 12 placement portion of the plate cylinder 9 faces the laser irradiation device 91. The laser irradiation device 91 is turned on at the rotational position of the plate cylinder 9 that has passed the position to be moved, that is, at the rotational position of the plate cylinder 9 where the tip of the used master 21 on the plate cylinder 9 is substantially opposite to the laser irradiation device 91. To do.
The laser irradiation device 91 is driven to irradiate the plate-making image forming unit 35 (see FIG. 4) formed on the plate-making master 21 on the plate cylinder 9 that rotates clockwise in FIG. Since the plate-making image forming unit 35 (see FIG. 4) of the used master 21 on the plate cylinder 9 is damaged due to the above-described thermal shrinkage, the plate-making formed on the plate-formed master 21 on the plate cylinder 9 is damaged. To the extent that the image cannot be read, to the extent that transfer by the plate-making image cannot be performed, and to the extent that the used master 21 on the plate cylinder 9 can be peeled and discharged by the plate discharging unit 5 Moreover, the mesh screen 9b is damaged to such an extent that it is not damaged.
Here, by rotating the plate cylinder 9 a plurality of times, the plate-making image forming unit 35 (see FIG. 4) of the used master 21 on the plate cylinder 9 is more sufficiently heated by the laser beam 92 from the laser irradiation device 91. Of course, it is possible to shrink and damage. Therefore, the tenth embodiment can obtain the same advantages as those of the ninth embodiment.

(Eleventh embodiment)
FIG. 12 shows an eleventh embodiment.
The eleventh embodiment is mainly different from the tenth embodiment in that the stencil printing apparatus 1 is capable of setting the security mode and has a master damaging device 90A instead of the master damaging device 90. To do.
Compared with the master damaging device 90 of the tenth embodiment, the master damaging device 90A has an operation panel 46A shown in FIG. 6 in place of the operation panel 46, and has a control means 93A in place of the control means 93. Is mainly different. Other configurations are the same as those of the tenth embodiment.

  Compared with the control means 93, the control means 93A controls a laser drive circuit (not shown) so that the laser irradiation device 91 is turned on when the security mode is set by pressing the security mode key 36, and the plate The difference is that it has a function of controlling the main motor 112 so that the barrel 9 rotates.

Based on the above-described configuration, the operation of the eleventh embodiment will be described with a focus on differences from the tenth embodiment.
The first difference is that the plate discharging operation executed when the user presses the plate making start key 47 after setting the plate making conditions with the various keys on the operation panel 46, and the user performs the confidential mode key 36 at the end of the previous printing. When the security mode is not set without pressing the key, the master damaging device 90A is in the non-operating state (the laser irradiation device 91 remains in the non-driven state), and is peeled off from the outer peripheral surface of the plate cylinder 9. The used master 21 to be ejected is capable of reading the plate-making image and transferring the plate-making image.

  As in the tenth embodiment, the second difference is that when the set number of prints is consumed, the plate cylinder 9 returns to the home position and stops again, and the printing operation is completed. When the security mode is set by the user pressing down the confidential mode key 36 when the plate making standby state is entered again, the laser irradiation apparatus is started for the first time in the same manner as in the tenth embodiment by an instruction from the control means 93A. 91 is in a point of operation.

  Therefore, according to the eleventh embodiment, there are advantages similar to those of the tenth embodiment. Moreover, when the necessity of confidentiality of the master 21 that has been made is determined by the user and the confidentiality mode is set by pressing the confidential mode key 36, the master damaging device 90A is the same as in the tenth embodiment. By operating, for example, when performing printing that does not require confidentiality continuously, that is, when performing a series of operations from discharging to printing / discharge processes continuously, the master damaging device 90A is not activated. Since it remains in the state, the total printing time can be shortened compared to the tenth embodiment.

(Twelfth embodiment)
FIG. 12 shows a twelfth embodiment.
The twelfth embodiment is mainly different from the tenth embodiment in having a master damaging device 90B instead of the master damaging device 90.
The master damaging device 90B is mainly different from the master damaging device 90 of the tenth embodiment in that it includes control means 93B instead of the control means 93. Other configurations are the same as those of the tenth embodiment.

Compared with the control means 93, the control means 93 </ b> B replaces the laser irradiation device 91 after the completion of printing on the predetermined number of sheets of paper P, instead of operating the laser irradiation apparatus 91, that is, the plate discharge operation from the plate making start key 47. The main difference is that a laser drive circuit (not shown) is controlled so that the laser irradiation device 91 operates based on a signal related to the activation, and a function of controlling the main motor 112 so that the plate cylinder 9 rotates. .
Here, “at the time of the plate removal operation” means to include both “just before the plate release operation is performed” or “in parallel with the activation of the plate release operation”.

Based on the above-described configuration, the operation of the twelfth embodiment will be described focusing on the differences from the tenth embodiment.
The first difference is that when printing on a predetermined number of sheets of paper P is completed, the main motor 112 is not started and the laser irradiation device 91 is not driven by a command from the control means 93B. The used master 21 peeled and discharged from the outer peripheral surface of the plate cylinder 9 can read the plate-making image and can be transferred by the plate-making image, and is not in a confidential state.

  The second difference is that the control means 93B performs the following on the basis of a signal relating to the start of the plate discharging operation generated when the user presses the plate making start key 47 after setting the plate making conditions with various keys on the operation panel 46. It is a point which performs control operation like this. That is, the rotational position of the plate cylinder 9 past the position where the clamper 12 placement portion of the plate cylinder 9 faces the laser irradiation apparatus 91, that is, the tip end portion of the used master 21 on the plate cylinder 9 is almost at the laser irradiation apparatus 91. When the laser beam 92 is irradiated from the laser irradiation device 91 at the rotation position of the plate cylinder 9 facing, the plate-making image forming unit 35 (see FIG. 4) of the used master 21 on the plate cylinder 9 described above. It is in the point of causing shrinkage and damage. Therefore, according to the twelfth embodiment, there are advantages similar to those of the ninth embodiment.

FIG. 13 shows a modified example of the security mode setting means in place of the security mode key 36. The security mode setting unit shown in FIG. 13 includes an image sensor 44 serving as a document reading unit that reads an image of the document 69, and an upper right margin portion 146 of the document 69 in FIG. The confidentiality mode is automatically set based on, for example, a black ring mark 147 as a readable mark formed on a broken line) and a signal related to reading of the ring mark 147 from the image sensor 44. The control unit 68A, 78A, 82A, 93A (hereinafter, represented by the control unit 68A of the second embodiment) is mainly configured.
In FIG. 13, reference numeral X <b> 1 indicates a document transport direction parallel to the paper transport direction X, and reference sign Y <b> 1 indicates a document width direction parallel to the paper width direction Y.

  The sign is not limited to the black ring mark 147, and may be a colored ring mark 147 such as red other than black as long as it can be read by the image sensor 44 and has a range. It may be rectangular or the like, or may be a circled “secret” or “secret” character, a “secret” character, a circled “S” character, or a barcode.

  The control means 68A may be given the following control function in addition to the basic control function of automatically setting the confidentiality mode as described above. That is, reading of the image of the document 69 including the ring mark 147 is performed in parallel with or slightly delayed from the plate making operation, so the confidentiality mode is set after setting the plate making conditions by pressing the plate making start key 47 or the like. Is done. Therefore, in order to obtain a regular printed material that should be kept confidential, including a printed material that should be kept confidential, even if the confidentiality mode is set by reading the image of the document 69 including the ring mark 147, the printing is performed. It is necessary to be able to perform printing for the number of prints set so that the printing conditions including can be set. Focusing on this point, the control unit 68A can set the printing condition after automatically setting the security mode based on the signal related to the reading of the ring mark 147 from the image sensor 44. Thus, based on signals from the numeric keypad 52 and the print start key 48, control target drive means (mainly actuators such as the main motor 112 and the paper feed motor) of each part of the stencil printing apparatus 1 so as to execute predetermined printing. ) May be added. The following operations are performed in the same manner as in the above embodiments.

  According to the security mode setting means shown in FIG. 13, it is possible to remove the security mode key 36 that can be visually recognized by a third party who is in danger of leaking security, thereby further enhancing the security function. In addition, the user forgets to press the confidential mode key 36 after the end of predetermined printing requiring confidentiality, and the confidentiality mode is canceled (normal mode), thereby further ensuring the leakage of confidential information. Can be prevented. The security mode setting means shown in FIG. 13 may be provided in combination with the security mode key 36, and may be switched appropriately for use.

The plate discharging unit 5 (plate discharging device) disposed in the stencil printing apparatus 1 is not limited to this, and has a known configuration such as an automatic plate discharging device described in, for example, Japanese Patent No. 3063936 (Japanese Patent Laid-Open No. 5-286223). Of course, it may be arranged.
Further, instead of a master provided with a thermoplastic resin film, such as a printing apparatus such as an stencil printing apparatus 1 that does not have a plate discharging unit 5 as a plate discharging means, for example, an offset printing machine or a direct printing printing machine, a metal In addition, when applied to a printing press using a resin-made plate, there is a configuration in which a used plate is not automatically peeled off or discharged from the plate cylinder. In a printing apparatus that does not include such a plate discharging unit 5 as a plate discharging unit, the required plate discharging quality required for the master damaging devices 60B, 70B, 80B, and 90B, that is, “the plate cylinder 9 by the plate discharging unit 5”. “To the extent that the above used master 21 can be peeled and discharged” is not necessary.

  The printing apparatus according to the present invention is not limited to the stencil printing apparatus 1, and for example, ink is applied from the outside of a plate cylinder (printing drum) as disclosed in JP-A-7-17013 (Japanese Patent No. 2790963). The present invention can also be applied to a printing apparatus configured to supply ink, that is, a so-called intaglio printing apparatus that supplies ink to a master on a plate cylinder and forms a printed image on a sheet. That is, the present invention can be applied to or applied mutatis mutandis to any type of printing apparatus that may leave a pre-printed plate that requires confidentiality or a used plate on the plate cylinder after the completion of predetermined printing. .

  As described above, the present invention has been described with respect to specific embodiments and examples. However, the configuration of the present invention is not limited to the above-described embodiments and modifications, and may be combined as appropriate. 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 in accordance with the necessity, purpose, and application.

  As a printing machine that uses a plate (especially a resin plate) in place of a master in a printing apparatus that may leave the prepressed plate on the plate cylinder, for example, an offset printing machine or a direct printing printer Applicable.

It is a front view of the whole stencil printing apparatus which shows the 1st thru | or 3rd embodiment of this invention. It is a partial front view around the master damage apparatus of the 1st thru | or 3rd embodiment of this invention. It is a partial cross section figure of the principal part of the printing part of the stencil printing apparatus in FIG. It is a fragmentary top view around the master damage apparatus of the 1st thru | or 3rd embodiment of this invention. It is a top view of the operation panel used for the 1st, 3rd, 4th, 6th, 7th, 9th, 10th, 12th embodiment of the present invention. It is a top view of the operation panel used for the 2nd, 5th, 8th, 11th embodiment of this invention. It is a front view of the principal part around the master damage apparatus of the 4th thru | or 6th embodiment of this invention, and the modification 5. It is a fragmentary top view of the principal part which shows the formation part of the file-shaped protrusion of the file-shaped blade used for the 4th-6th embodiment of this invention. It is a partial cross section front view around the master damage apparatus which shows the modification 4 and 5 of this invention. It is sectional drawing explaining the dimension shape of the sawtooth processus | protrusion of the serrated blade used for the modification 5. FIG. It is a front view of the principal part around the master damage apparatus of the 7th thru | or 9th embodiment of this invention. It is a front view of the principal part around the master damage apparatus of the 10th thru | or 12th embodiment of this invention. It is a top view explaining the ring mark of the manuscript concerning the modification of the security mode setting means.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stencil printing apparatus 5 as an example of printing apparatus Plate discharging part 9 as plate discharging means Plate cylinder 9a Porous support plate 9b Mesh screen 10 as ink holding member Press roller 21 as pressing means Master (plate)
21a Porous support 21b Thermoplastic resin film as a resin film 36 Confidential mode key 60, 60A, 60B, 70, 70A, 70B, 80, 80A, 80B, 90, 90A, 90B as a confidentiality mode setting means Master damage Device 61 Protruding rollers 67, 77 as damaging means Displacement means 65, 75 Solenoids 68, 68A, 68B, 78, 78A, 78B as driving means constituting the displacement means, 82, 82A, 82B, 93, 93A, 93B control Means 71 Damage means, file-like blade 79 as a file-like member Damage means, saw-tooth blade 81 as a saw-tooth member Heating wire 91 as damage means Damaged means, laser irradiation device 146 as laser irradiation means Upper right as a specific region Margin part 147 Ring mark as a sign

Claims (13)

In a printing apparatus having a plate cylinder around which a master having a resin film on which a plate-making image is formed is wound,
After the printing is completed, the printing has a damaging means for damaging the plate-making image forming unit of the plate-making master to the extent that the plate-making image formed on the plate-making master on the plate cylinder is at least unreadable. apparatus. In a printing apparatus having a plate cylinder around which a master provided with a resin film on which a plate-making image is formed, and capable of setting a security mode,
The plate-making image forming unit of the pre-printed master to the extent that the plate-making image formed on the pre-printed master on the plate cylinder is at least unreadable after the printing is completed when the confidentiality mode is set. A printing apparatus comprising damage means for damaging the printer. In a printing apparatus having a plate cylinder around which a master provided with a resin film on which a plate-making image is formed, and capable of setting a security mode,
Security mode setting means for setting the security mode;
When the security mode is set by the security mode setting means, the master-making image forming unit of the master that has been made to the extent that the plate-making image formed on the master that has been made on the plate cylinder is at least unreadable. And a damage means for damaging the printer. In a printing apparatus comprising a plate cylinder on which a master provided with a resin film on which a plate-making image is formed, and a plate discharging means for performing a plate discharging operation for peeling and discharging a used master on the plate cylinder,
At the time of the plate discharging operation, the used master on the plate cylinder is peeled off and discharged by the plate discharging means to the extent that the plate-making image formed on the used master on the plate cylinder is at least unreadable. A printing apparatus comprising damage means for damaging the plate-making image forming section of the pre-printed master to the extent possible. The printing apparatus according to any one of claims 1 to 3,
It has a plate removal means for peeling and discharging the used master on the plate cylinder,
The printing apparatus according to claim 1, wherein the damaging means damages the plate-making image forming unit to such an extent that the used master on the plate cylinder can be peeled and discharged by the discharging means. The printing apparatus according to any one of claims 1 to 5,
The plate cylinder has an ink holding member around which the master made of the plate is wound,
The printing apparatus according to claim 1, wherein the damaging means damages the plate-making image forming unit to such an extent that the ink holding member is not damaged. The printing apparatus according to any one of claims 1 to 6,
The printing apparatus according to claim 1, wherein the damage means is a rotatable protrusion roller having a protrusion on an outer peripheral portion for contacting and damaging the plate-making image forming portion. The printing apparatus according to claim 7.
The protrusion roller is in contact with the plate-making image forming portion formed on the plate-making master on the rotating plate cylinder, and can be driven and rotated.
A printing apparatus comprising: a braking unit that scratches the plate-making image forming unit by applying a braking force to the driven rotation of the protrusion roller. The printing apparatus according to any one of claims 1 to 6,
The printing apparatus according to claim 1, wherein the damaging means is a file-shaped member having a file-shaped projection for contacting and damaging the plate-making image forming unit. The printing apparatus according to any one of claims 1 to 6,
The printing apparatus according to claim 1, wherein the damaging means is a sawtooth member provided with a sawtooth protrusion for contacting and damaging the plate-making image forming unit. The printing apparatus according to any one of claims 1 to 10,
A printing apparatus comprising: displacement means for displacing the damaging means between a contact position where the damage means is brought into contact with the plate-making image forming unit and a separation position separated from the contact position. The printing apparatus according to any one of claims 1 to 6,
The printing apparatus, wherein the damaging means is laser irradiating means for damaging the plate-making image forming portion formed on the plate-making master on the plate cylinder by irradiating the laser beam with heat shrinkage. . The printing apparatus according to claim 3.
The confidentiality mode setting means is based on a document reading means for reading an image of a document, a readable sign formed in a specific area of the document, and a signal related to reading of the sign from the document reading means. And a control unit that automatically sets the security mode.

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