JP3946818B2 - Plate removal device in printing apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plate discharging apparatus in a printing apparatus.
[0002]
[Prior art]
A rotary stencil printing apparatus is known as a printing apparatus. Such a stencil printing apparatus includes a stencil discharge machine having a stencil roller for peeling off a used thermal stencil master (hereinafter simply referred to as “master”) wound on the outer peripheral surface of the plate cylinder. As a master, for example, a very thin thermoplastic resin film having a thickness of 1 to 2 μm and a natural support such as Japanese paper or a synthetic fiber, or a mixture of natural fiber and synthetic fiber as a porous support (base) A laminated structure having a laminated structure is used.
[0003]
As a plate discharging apparatus having a plate discharging roller as described above, for example, as disclosed in JP-A-5-309933 and JP-A-5-286223, the front end of a master disposed in a plate cylinder is used. Open the clamper that can be freely opened and closed, bring the displaceable plate roller into contact with the master tip and start peeling the used master from the master tip. As disclosed in Japanese Patent No. 274, Japanese Patent Application Laid-Open No. 63-74679, etc., a displaceable plate discharging roller is brought into contact with the used master rear end wound around the outer peripheral surface of the plate cylinder, so that There is a master rear end peeling method that starts peeling a used master from the end.
[0004]
[Problems to be solved by the invention]
However, in recent years, in order to improve the quality of printed images, etc., there are cases where the master base is made of 100% fine synthetic fibers, or a master made by blending fine synthetic fibers with natural fibers (hereinafter referred to as “synthetic fiber base master”). ) Has been attempted. Such a synthetic fiber base master has a relatively low waist (rigidity). When the synthetic fiber base master is removed by the master rear end peeling method, the synthetic fiber base master is removed from the plate making apparatus even if an antistatic agent is applied to the synthetic fiber base master. The synthetic fiber base master is charged due to friction during plate making and feeding, which is transported to and wrapped around, and friction during printing, and the mesh screen is connected and connected to the clamper base at the rear end of the plate cylinder Since the rear end of the master, including the rear end of the synthetic fiber base master, is electrostatically adsorbed and stuck to the part called the part, the rear end of the master is attached using the friction of the discharge plate roller. Even if scraped off, there was a problem that a peeling error occurred, and as a result, a misprinting error occurred.
[0005]
Further, when the synthetic fiber base master is discharged by the master tip part peeling method, the master tip part sticks to the clamper base part due to charging of the yaw, synthetic fiber base master or the like, although not as described above. Even if the tip of the master is scraped off using the friction of the discharge roller, there is a problem that a peeling error occurs, resulting in a discharge error.
[0006]
Therefore, in order to solve such a problem, the present invention is a case where a synthetic fiber base master is used by providing scraping means for scraping used masters at a plurality of locations on the outer peripheral portion of the discharge plate roller. However, regardless of the state of the rear end or front end of the used master wound around the outer peripheral surface of the plate cylinder, the master rear end or master front end is forcibly scraped off from the outer peripheral surface of the plate cylinder. It is an object of the present invention to provide a plate discharging apparatus in a printing apparatus which can be peeled off without causing a peeling / discharge plate error.
[0007]
[Means for Solving the Problems]
  The invention described in claim 1 is a plate discharging apparatus in a printing apparatus having a plate discharging roller that peels a used master from the outer peripheral surface of the plate cylinder, and scrapes the used master at a plurality of locations on the outer peripheral portion of the plate discharging roller. Scraping meansA plurality of elastically deformable fins protruding substantially radially from the outer periphery of the discharge roller, and the scraping means is a scraping protrusion provided on the fin on the downstream side in the rotation direction of the discharge roller. Consists of partsIt is characterized by that.
[0008]
  The invention according to claim 2Claim 1In the plate removal device in the printing device,The scraping means are alternately arranged along the generatrix direction of the discharge plate roller and in the outer circumferential direction.It is characterized by that.
[0010]
  The invention according to claim 3 is the plate discharging apparatus in the printing apparatus according to claim 1 or 2,The master is a synthetic fiber base master in which a porous support containing synthetic fibers is bonded to a thermoplastic resin film.It is characterized by that.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention including examples will be described with reference to the drawings (hereinafter simply referred to as “embodiments”). In each of the embodiments and the like, components having the same functions and shapes are denoted by the same reference numerals, and description thereof is omitted as much as possible. In the figure, components that are configured as a pair and do not need to be specifically distinguished and described are described by appropriately describing one of them in order to simplify the description.
[0013]
First, an overall configuration and operation of a stencil printing apparatus as an example of a printing apparatus to which the present embodiment is applied will be briefly described with reference to FIG.
[0014]
In FIG. 11, reference numeral 50 denotes an apparatus main body frame. A portion indicated by reference numeral 80 on the upper part of the apparatus main body frame 50 constitutes a document reading apparatus, a portion indicated by reference numeral 90 below the plate making apparatus, and a portion indicated by reference numeral 100 on the left side thereof is a porous plate cylinder 101. The plate cylinder apparatus arranged, a portion indicated by reference numeral 70 on the left side thereof is a plate discharging apparatus to which the present embodiment is specifically applied, a portion indicated by reference numeral 110 below the plate making apparatus 90 is a paper feeder, and below the plate cylinder 101 A portion denoted by reference numeral 120 represents a printing pressure device, and a portion denoted by reference numeral 130 at the lower left of the apparatus main body frame 50 represents a paper discharge device. This stencil printing apparatus is a heat-sensitive digital stencil printing apparatus.
[0015]
The operation of this stencil printing apparatus will be described below.
First, a document 60 having an image to be printed is placed on a document placing table (not shown) arranged at the top of the document reading device 80, and a plate making start key (not shown) is pressed. Along with the pressing of the plate making start key, a plate removing process is first executed. That is, in this state, the used master 61 used in the previous printing remains attached to the outer peripheral surface of the plate cylinder 101 of the plate cylinder apparatus 100.
[0016]
When the plate cylinder 101 rotates counterclockwise and the rear end of the used master 61 on the outer peripheral surface of the plate cylinder 101 approaches a pair of upper and lower discharge rollers on the upper and lower plates 71 and 72 in the discharge device 70, While the lower pair 71, 72 is rotating, the lower end of the used master 61 is scooped up by one lower discharge roller 72, and a pair of upper and lower discharge plates disposed on the left of the lower pair 71, 72 on the discharge roller. Inside the discharge plate box 77 while being conveyed in the direction of the arrow Y1 by the lower 73, 74 on the pair of upper and lower discharged plate conveying belts spanned between the lower roller 75, 76 and the lower roller 71, the lower pair 71, 72 on the conveying roller The used master 61 is peeled off from the outer peripheral surface of the plate cylinder 101, and the plate discharging process is completed. At this time, the plate cylinder 101 continues to rotate counterclockwise. The used master 61 that has been peeled and discharged is then compressed inside the plate discharging box 77 by the compression plate 78. Thus, in this stencil printing apparatus, the master rear end peeling method is adopted.
[0017]
In parallel with the plate removal process, the document reader 80 reads the document. That is, the document 60 placed on a document placement table (not shown) is conveyed in the directions of arrows Y2 to Y3 by the rotation of the separation roller 81, the front document conveyance roller pair 82a and 82b, and the rear document conveyance roller pair 83a and 83b. While being used for exposure reading. At this time, when there are a large number of documents 60, only the lowermost document is conveyed by the action of the separating blade 84. When reading the image of the original 60, the reflected light from the surface of the original 60 illuminated by the fluorescent lamp 86 while being conveyed on the contact glass 85 is reflected by the mirror 87 and passes through the lens 88 and is composed of a CCD (Charge Coupled Device). This is performed by being incident on the image sensor 89. The document 60 from which the image has been read is discharged onto the document tray 80A. The electrical signal photoelectrically converted by the image sensor 89 is input to an analog / digital (A / D) conversion board (not shown) in the apparatus main body frame 50 and converted into a digital image signal.
[0018]
On the other hand, in parallel with this image reading operation, plate making and plate feeding processes are performed based on the digital signalized image information. That is, a platen roller 92 that is pulled out from a roll-shaped master roll 61A that is set so that the master 61 can be fed to a predetermined part of the plate-making apparatus 90 and pressed against the thermal head 91 via the master 61, and The feed roller pair 93a, 93b is transported downstream in the master transport direction Y. In response to the digital image signal sent from the A / D conversion board (not shown), a plurality of minute heating elements arranged in a line on the thermal head 91 with respect to the master 61 thus conveyed. Then, the thermoplastic resin film of the master 61 that selectively generates heat and is in contact with the generated heating element is melt-pierced. In this way, image information is written as a drilling pattern by position-selective melt drilling of the master 61 according to the image information.
[0019]
For example, the master 61 is, for example, a porous support containing 100% fine synthetic fiber made of polyethylene terephthalate (PET), and a thermoplastic resin having a thickness of 1.5 μm made of polyethylene terephthalate (PET). A so-called synthetic fiber base master having a thickness of 25 to 30 μm bonded to the resin film is used.
[0020]
The leading end of the master 61 having image information written therein is fed toward the outer peripheral side of the plate cylinder 101 by a pair of feeding rollers 94a and 94b, and the traveling direction is lowered by a plate feeding guide plate (not shown). And hangs down toward the master clamper 102 (indicated by the phantom line) in which the plate cylinder 101 in the illustrated plate feeding position is expanded. At this time, the used master 61 has already been removed from the plate cylinder 101 by the plate discharging process.
[0021]
When the front end of the master 61 that has been subjected to plate making is clamped by the master clamper 102 at a certain timing, the plate cylinder 101 rotates in the direction A (clockwise direction) in the drawing while the master 61 that has been made plate is placed on the outer peripheral surface. Wrap gradually. The rear end portion of the master 61 that has been subjected to plate making is cut into a certain length by a cutter 95.
[0022]
When the master 61 of one plate is wound around the outer peripheral surface of the plate cylinder 101, the plate making and plate feeding steps are finished, and the printing step is started. First, the uppermost one of the printing sheets 62 stacked on the sheet feeding table 51 is sent in the direction of arrow Y4 toward the registration roller pair 113a and 113b by the sheet feeding roller 111 and the separation roller pair 112a and 112b. Further, it is sent to the printing pressure device 120 at a predetermined timing synchronized with the rotation of the plate cylinder 101 by the registration roller pair 113a, 113b. When the fed printing paper 62 comes between the plate cylinder 101 and the press roller 103, the press roller 103 which has been separated below the outer peripheral surface of the plate cylinder 101 is moved upward, whereby the plate cylinder 101. It is pressed by the master 61 that has been pre-rolled around the outer peripheral surface. In this way, ink oozes out from the perforated part of the plate cylinder 101 and the perforated pattern part of the master 61 already made (not shown), and the oozed ink is transferred to the surface of the printing paper 62 to form a printed image. Is done.
[0023]
At this time, on the inner peripheral side of the plate cylinder 101, ink is supplied from the ink supply pipe 104 to the ink reservoir 107 formed between the ink roller 105 and the doctor roller 106, and in the same direction as the rotation direction of the plate cylinder 101. Ink is supplied to the inner peripheral side of the plate cylinder 101 by the ink roller 105 that rolls in contact with the inner peripheral surface while rotating in synchronization with the rotation speed of the plate cylinder 101.
[0024]
The printing paper 62 on which the printing image is formed in the printing pressure device 120 is peeled off from the plate cylinder 101 by the paper discharge claw 114 in the paper discharge device 130 and is adsorbed by the suction fan 118, and the suction paper discharge inlet roller 115 and By the counterclockwise rotation of the conveyor belt 117 stretched around the suction discharge outlet roller 116, it is conveyed toward the discharge tray 52 as indicated by an arrow Y5, and is sequentially discharged and stacked on the discharge tray 52. In this way, so-called trial printing is completed.
[0025]
Next, when the number of prints is set using a numeric keypad (not shown) and a print start key (not shown) is pressed, the steps of paper feeding, printing, and paper discharge are repeated for the set number of prints in the same process as the test printing. All the processes of stencil printing are completed.
[0026]
  Figure1 to 4, the present inventionReference example related to (hereinafter referred to as "reference example")Will be described.
  In FIG. 1, reference numeral 1 denotesReference exampleFIG. This plate discharging device 1 is forcibly replaced with the plate discharging device 70 shown in FIG. 11 at the rear end portion of the used master 61 provided at a plurality of locations on its outer peripheral portion instead of under the plate discharging roller 72. The only difference is that it has a lower plate roller 2 provided with a plurality of grooves 3 having scraping corners 4 as scraping means. The under-rolling roller 2 does not scrape off the master 61 by a simple friction coefficient difference with respect to the master 61 unlike the conventional discharging roller 72, but mechanically scrapes the rear end of the used master 61. At the same time, the separation and conveyance are also performed by utilizing the difference in the friction coefficient.
[0027]
In the following, the configuration of the bottom 2 of the discharge roller will be described in detail, and the configuration around the bottom 2 of the discharge roller shown in FIG.
In the embodiment, the lower roller 2 is made of a nitrile rubber (NBR) having a rubber hardness of 40 Hs (JIS-A scale) excellent in oil resistance, wear resistance and aging resistance and integrated with the shaft 2a. Is formed. The groove 3 is formed on the outer periphery of the bottom 2 of the discharge roller along the generatrix thereof at six locations obtained by equally dividing the outer periphery of the bottom 2 of the discharge roller 60 by 60 °, and the opening angle θa of the groove 3 is 60 °. As shown in FIG. The bottom 2 of the discharge plate roller is a skewer-like piece-cutting roller arranged at, for example, four places in the direction of the axis 2a. The bottom roller diameter Da of the groove 3 is 16.6 mm, and the outer diameter Db is 20.6 mm. Yes. As shown in FIG. 1 and FIG. 2, the scraping corner portion 4 under the discharge roller 2 is formed in the groove 3 on the upstream side in the counterclockwise direction, which is the rotation direction of the discharge roller 2, and is said to be angular. And a substantially acute angle close to 90 °. As shown only in FIG. 3, the symbol θα indicates the rake angle of the scraping corner portion 4. This rake angle θα is determined by the scraping direction (counterclockwise rotation) between the inner wall of the scraping corner 4 contacting the rear end surface of the used master 61 or the upper surface of the rear end edge of the master 61 and the bottom 2 of the discharge roller. This represents the angle between the surface perpendicular to the direction. A portion indicated by reference numeral 2b is a belt routing groove portion for hanging a lower plate conveying belt 74 formed in a central portion of the lower roller 2 under the axis 2a.
[0028]
The upper plate discharge roller 71, the upper plate transfer roller 75 and the lower plate transfer roller 76 are made of nitrile rubber (NBR) having the same rubber hardness 40Hs as the lower plate roller 2, and are integrated with the respective shafts 71a, 75a, 76a. Is formed. The portion indicated by 71 b on the upper plate roller 71 is a belt groove bottom portion for hanging the upper plate conveying belt 73 formed at the center of the upper plate roller 71 in the axis 71 a direction. As shown in the drawing, the upper plate 71 and the lower plate roller 2 have the outer peripheral surfaces in pressure contact with each other, and the above-mentioned plate motor through a rotation transmission means such as a gear connected to the plate motor not shown. It is rotated. Endless belts made of nitrile rubber (NBR) are used for the lower pairs 73 and 74 on the discharged plate conveying belt.
[0029]
As shown in FIG. 1, the lower plate roller 2 is pressed against the upper plate roller 71 by means of a link mechanism (not shown) and contact / displacement means having a biasing means such as a solenoid or a spring for driving the link mechanism. A separation position where the master 61 is peeled off from the outer peripheral surface of the plate cylinder 101 by contacting the outer peripheral surface of the plate cylinder 101 while maintaining a combined state, and a separation indicated by an imaginary line separated from the outer peripheral surface of the plate cylinder 101 It is configured to be displaceable between positions.
[0030]
Next, the operation of the plate discharging apparatus 1 will be described focusing on differences from the operation of the plate discharging apparatus 70 shown in FIG.
In FIG. 1, when the plate cylinder 101 rotates counterclockwise, and the rear end portion of the used master 61 on the outer peripheral surface of the plate cylinder 101 approaches a lower pair 71 and a lower pair of plate discharge rollers in the plate discharge apparatus 1. On the same roller, the lower pair 71, 2 is rotating, and one of the discharge plate rollers 2 moves the mesh screen 101 a at the rear end of the plate cylinder 101 by the operation of the contact / separation displacement means (not shown). ) And occupies the peeling position. At this time, as shown in FIGS. 1 and 3, the master 61 is transported from the plate making apparatus 90 shown in FIG. It is assumed that the master 61 is charged and the rear end portion of the master 61 including the rear end of the used master 61 is electrostatically adsorbed and attached to the leather portion 101b.
[0031]
  When the discharge roller bottom 2 comes into contact with the leather portion 101b and occupies the peeling position, as shown in FIG. 3, the scraping corner 4 in the scraping corner 4 of the discharge roller bottom 2 at a certain location has been used. Master 61Rear end face (rear front face)At the end of the used master 61Rear end faceOr scraping off the rear end of the master 61, or in the scraping corner 4 under the discharge roller 2 at another location, as shown in FIG. It is difficult to hook from the upper surface of the rear edge of the rear edge, and it is scraped off as if it were scraped off. At this time, since the lower roller 2 has an appropriate rubber hardness as described above, an appropriate elasticity can be obtained without damaging the leather portion 101b and / or the mesh screen 101a or breaking the used master 61. While deforming, the master 61 is scraped off and peeled off.
[0032]
The rear end portion of the master 61 thus scraped off and peeled off is temporarily held in the groove 3 of the lower plate roller 2 and is rotated by the lower plate roller 2 rotating counterclockwise. 101 is sequentially peeled off from the outer peripheral surface of 101, and is inserted into the nip portion of the lower pair 71, 2 on the discharged plate roller, and the light reflection type photo sensor disposed on the upper left of the lower pair 71, 2 on the discharged plate roller (Not shown), the tip of the used master 61 that has been peeled off is detected, and immediately the energization of the solenoid of the contact / separation displacement means is stopped, and the bottom 2 of the discharged plate roller is moved by the biasing force of the spring. Occupies a spaced position. The used master 61 peeled off from the outer peripheral surface of the plate cylinder 101 is conveyed in the direction of arrow Y1 on the discharge plate roller, on the lower pair 71, 2, on the discharge plate transport belt, and on the lower pair 73, 74, and is shown in FIG. The discharged master box 61 is discharged into the illustrated plate discharge box 77, and the used master 61 for one plate is peeled off from the outer peripheral surface of the plate cylinder 101, and the plate discharging process is completed. At this time, the plate cylinder 101 continues to rotate counterclockwise. The used master 61 that has been peeled and discharged is then compressed inside the plate discharging box 77 by a compression plate 78 shown in FIG.
[0033]
  Reference example1, the rear end portion of the used master 61 as shown by the phantom line in FIG. 1 is lifted without sticking to the leather portion 101b or the mesh screen 101a. Needless to say, even if it is in a state, it can be surely peeled and discharged without a mistake in peeling.
[0034]
  Therefore,Reference exampleEven if the synthetic fiber base master 61 is used, by providing the lower plate roller 2 provided with the grooves 3 having the scraping corners 4 at a plurality of locations on the outer peripheral portion. Regardless of the state of the rear end portion of the used master 61 wound around the outer peripheral surface of the plate cylinder 101, the rear end portion of the master 61 is forcibly scraped from the outer peripheral surface of the plate cylinder 101 and reliably peeled off. As a result, there is an advantage that no mistakes of peeling and discharging occur. In addition, since the lower discharge roller 2 can be manufactured relatively easily, there is an advantage that the manufacturing cost is low.
[0035]
(Reference exampleModification 1)
  In FIG.Reference exampleThe modification 1 of is shown. The discharged plate roller is shown in FIGS.Reference exampleIn addition to the under-rolling roller 2 in FIG. 5, the under-rolling roller 2A as shown in FIG. The undercutting roller bottom 2A in this modified example 1 has a groove 3A cut out in a U-shape with respect to the undercutting roller bottom 2, and is more acute than the scraping corner 4 of the undercutting roller bottom 2 The only difference is that it has a scraping corner 4A. In other words, the rake angle θα of the scraping corner portion 4A at the bottom 2A of the discharge roller is formed larger than the rake angle θα of the scraping corner 4 at the bottom 2 of the discharge roller. In order to surely peel off the rear end portion of the used master 61 shown in FIG. 1, FIG. 3, FIG. 4 and the like without making a mistake in peeling, from the action when scraping the master 61 as described above. Therefore, it can be said that the scraping corner portion 4A having a sharp rake angle θα is preferable to the sharp corner portion 4 having an acute angle close to 90 °.
[0036]
(Reference exampleModified example 2)
  In FIG.Reference exampleVariation 2 of FIG. The bottom 2 of the discharged plate roller in this modified example 2 isReference exampleInstead of the disposition state of the under-rolling roller 2 in FIG. 2, the only difference is that the formation positions of the grooves 3 having the scraping corners 4 are staggered along the generatrix direction of the under-rolling roller 2 and in the outer peripheral direction. FIG. 6 shows only two of the four arrangement positions under the discharge roller 2 but the grooves 3 having the scraping corners 4 are alternately arranged with the pitch P shifted in the outer peripheral direction. It is.
[0037]
Thus, if the formation positions of the grooves 3 having the scraping corners 4 are arranged alternately along the generatrix direction under the discharge roller 2 and in the outer peripheral direction, they are shown in FIG. 1, FIG. 3, FIG. The rear end of the used master 61 is hooked by the scraping corner 4 and the chance of scraping is increased, so that the rear end of the master 61 is forcedly scraped from the outer peripheral surface of the plate cylinder 101 more reliably than scraping. Since it can be peeled off, it is possible to more reliably prevent a peeling / removal error. It should be noted that, of course, under the discharge roller 2 at the same location sandwiching the belt routing groove 2b, the grooves 3 may be formed alternately along the generatrix direction of the discharge roller 2 and in the outer circumferential direction. The same advantages as described above can be obtained.
[0038]
Also in each of the discharge roller bottoms 2 and 2A of the modified examples 1 and 2, the rear end portion of the used master 61 as shown by an imaginary line in FIG. 1 is not attached to the leather portion 101b or the mesh screen 101a. Needless to say, even if it is in a state of being lifted, it can be reliably peeled and discharged without causing a mistake in peeling.
[0039]
  Reference exampleIn addition, each of the discharge roller bottoms 2 and 2A of the modified examples 1 and 2 is merely an example, and the material, the hardness of the material, the number of grooves 3 and 3A formed, the shape thereof, the discharge roller bottoms 2 and 2A Detailed specifications such as the arrangement state and the appropriate range of the rake angle θα of the scraping corners 4 and 4A are experimental and / or design in consideration of the reliability, durability and cost of peeling off the used master 61. Belongs to matters determined by
[0040]
(Form of implementationstate)
  FIG. 7 and FIG.StateShow.
  In FIG. 7, reference numeral 10 denotes an embodiment.StateFig. 3 shows a plate removal device. Implementation formStateThe plate removal device 10 isReference exampleThe only difference is that instead of the under-rolling roller 2 of the discharging apparatus 1 in FIG. The bottom 5 of the discharged plate roller is integrally formed with four fins 6 projecting in a substantially radial direction from its outer periphery. These fins 6 are integrally formed with a substantially acute-angled scraping projection 7 as scraping means on the downstream side in the counterclockwise direction, which is the rotational direction of the bottom 5 of the discharge roller.
[0041]
In the embodiment, the lower plate roller 5 is made of nitrile rubber (NBR) having a rubber hardness of 40 Hs, and is formed integrally with the shaft 2a. The fins 6 under the discharge plate roller 5 are formed so as to protrude at four locations where the outer periphery of the discharge plate roller 5 is equally divided by 90 °. As shown in FIG. 7, the lower end plate roller 5 has four end portions of fins 6 provided with scraping projections 7, and the outer peripheral surface of the upper end plate roller 71 indicated by an imaginary line and the phantom line. It arrange | positions so that the outer peripheral surface of the trunk | drum 101 may form a lapping allowance. The scraping protrusion 7 is formed at two positions on the tip of the fin 6, and a V-shaped notch groove 8 having a notch angle θb = 60 ° is formed between the two scraping protrusions 7. Has been.
[0042]
Next, the operation of the plate discharging apparatus 10 will be briefly described focusing on the difference from the operation of the plate lowering roller 2 in the plate discharging apparatus 1 shown in FIGS. 1, 3, and 4.
In FIG. 7, when the plate cylinder 101 rotates counterclockwise, and the rear end portion of the used master 61 on the outer peripheral surface of the plate cylinder 101 approaches the upper and lower pair of plate discharging rollers in the plate discharging apparatus 10 and the lower 71, 5. While the lower pair 71, 5 rotates on the roller, the tip portion of the fin 6 under one of the discharge plate rollers 5 is rotated by the operation of the contact / separation displacement means, and the leather portion (see FIG. 7) of the rear end portion of the plate cylinder 101. (Not shown) and occupy the peeling position. At this time, the tip part of the fin 6 under the discharge roller 5 is elastically deformed from the base part of the fin 6 by coming into contact with the leather part, and the scraping projection part 7 of the fin 6 is exactly shown in FIGS. 4 is placed in a state close to the scraping corner 4 shown in FIG.
[0043]
  FIG. 3 is used to explain the situation where the bottom 5 of the discharge roller occupies the peeling position. In the scraping projection 7 in the second stage from the tip of the fin 6, the tip 7a of the inner wall of the scraping projection 7 has been used. Master 61 ofRear end face (rear front face)At the end of the used master 61Rear end faceThe rear end of the master 61 is scraped off, or the scraping projection 7 at the tip (first stage) of the fin 6 is explained with reference to FIG. The inner wall front end portion 7a is not easily caught from the upper surface of the rear end edge portion of the master 61, and is scraped off and peeled off as if it were scraped off. At this time, since the fin 6 under the discharge roller 5 has an appropriate rubber hardness as described above, without damaging the leather portion 101b and / or the mesh screen 101a or cutting the used master 61, The master 61 is scraped off and peeled off while being moderately elastically deformed.
[0044]
  The rear end portion of the master 61 thus scraped and peeled is rotated counterclockwise while being temporarily held in the inner wall tip portion 7a or the notch groove 8 of the scraping projection portion 7. It is sequentially peeled off from the outer peripheral surface of the plate cylinder 101 by the lower plate roller 5 and is inserted into the nip portion of the lower pair 71, 5 on the upper plate roller.Reference examplesThe same plate removal operation is performed.
[0045]
  Therefore, the form of implementationStateAccording to the plate discharging device 10, the two scraping protrusions 7 having a sharp angle as scraping means are provided on the downstream side in the counterclockwise direction, which is the rotation direction of the bottom 5 of the plate discharging roller, projecting from the outer periphery of the plate discharging device 10 in a substantially radial direction. By having a plurality of fins 6 provided with the above, even if the synthetic fiber base master 61 is used, the rear end portion of the used master 61 wound around the outer peripheral surface of the plate cylinder 101 is used. Regardless of the state, the rear end portion of the master 61 can be forcibly scraped from the outer peripheral surface of the plate cylinder 101 and peeled off with certainty. In addition, since the lapping margin between the tip of the fin 6 and the outer peripheral surface of the plate discharge roller 71 and the outer peripheral surface of the plate cylinder 101 can be easily provided, the structure / accuracy of the contact / separation displacement means is simplified. Thus, the degree of freedom in design can be improved.
[0046]
  Implementation formStateAlso in the bottom 5Reference exampleNeedless to say, the first and second modifications can be appropriately applied. Also, the form of implementationStateAlso in the bottom 5 of the discharged plate roller, the rear end portion of the used master 61 as shown by the phantom line in FIG. 1, for example, is lifted without sticking to the leather portion 101b or the mesh screen 101a. Needless to say, even if there is, it can be reliably peeled off without making a mistake in peeling.
[0047]
  Implementation formStateThe under-roller roller 5 is merely an example, and the material, the hardness of the material, the number of fins 6 formed and their shape and arrangement, the number of scraping projections 7 and the shape and scraping projections, The detailed specifications such as the arrangement state of 7 belong to matters determined experimentally and / or by design in consideration of the reliability, durability, and cost of peeling off the used master 61.
[0048]
  The scraping means of the discharged plate roller isReference examples, modifications 1 and 2 and embodiments, etc.If the reliability of forcibly scraping the rear end portion of the master 61 from the outer peripheral surface of the plate cylinder 101 is not so much desired, the approximate gear as shown in FIG. A scraping ridge 16 as scraping means for scraping the used master 61 may be provided at a plurality of locations on the outer peripheral portion of the discharging roller 15, as in the discharging roller 15 having a shape.
[0049]
Further, the block-shaped scraping convex portion 21 as scraping means for scraping the used master 61 is not limited to the above-described one, but the outer peripheral portion of the scraping roller 20 as shown in FIG. Alternatively, a plurality of projections may be provided alternately.
[0050]
  Also in the discharged plate roller 15 shown in FIG. 9 and the discharged plate roller 20 shown in FIG.Reference exampleNeedless to say, the first and second modifications can be appropriately applied. Further, for example, even if the rear end portion of the used master 61 as shown by the phantom line in FIG. 1 is not attached to the leather portion 101b or the mesh screen 101a and is raised, Needless to say, it can be reliably peeled off without the need to do so.
[0051]
  UpNotedReference examples, modifications 1 and 2 and embodimentsIn addition to the plate removal apparatus 1 and 10 in the present invention, for example, it has the same configuration as that shown in FIGS. 1 to 5 of Japanese Utility Model Publication No. 2-274 or Japanese Patent Laid-Open No. 5-286223. The present invention can also be applied to a plate discharging roller or the like in a plate discharging apparatus of a master tip portion peeling method that starts peeling a used master from a master tip portion.
[0052]
  AboveReference examples, modifications 1 and 2 and embodiments, etc.The above-described scraping is not limited to the above, and if the reliability and durability of forcibly scraping and peeling the rear end portion or the front end portion of the used master 61 from the outer peripheral surface of the plate cylinder 101 is not so much required, It may be a state where there is no rake angle of the removing means, in other words, a discharged plate roller having an obtuse angle scraping means. Further, if the reliability and durability of scraping and peeling off the rear end portion or the front end portion of the used master 61 is not so desired, the scraping means has a saw-tooth shape, for example, a sawtooth shape and a knurled shape. May be formed integrally or separately.
[0053]
  As described above, the present invention has been described with respect to specific embodiments including examples, but the configuration of the present invention has been described above.Embodiment etc.It is not limited to the above, and these may be combined as appropriate, and within the scope of the present invention, various embodiments and examples can be configured according to the necessity and application. It will be apparent to those skilled in the art.
[0054]
【The invention's effect】
  As stated above, claim 1 or3According to the described invention,The rear end portion of the used master wound around the outer peripheral surface of the plate cylinder by the scraping protrusion provided on the downstream side in the rotation direction of the discharge plate roller in the plurality of fins protruding substantially radially from the outer periphery of the discharge plate roller Or, even if a synthetic fiber base master is used by forcibly scraping and peeling the front end, the rear end or front end of the used master wound around the outer peripheral surface of the plate cylinder Regardless of the state, the master's rear end or tip can be forcibly scraped from the outer peripheral surface of the plate cylinder and reliably peeled off. Since the wrap allowance between the outer peripheral surface of another discharge plate roller and the outer surface of the plate cylinder that is in pressure contact with the discharge plate roller can be easily provided, the structure and accuracy of the contact / displacement displacement means for detachably moving the discharge plate roller to and from the plate cylinder can be improved. Can be simplified It becomes a function, so that it is possible to improve the degree of freedom in design.
[0055]
  Claim2According to the invention described,In addition to the effects of the above invention, the scraping means is wound around the outer peripheral surface of the plate cylinder by the scraping means by being alternately arranged along the generatrix direction of the discharge plate roller and in the outer peripheral direction. This can increase the chances of forcibly catching and scraping the rear end or tip of the used master after it has been used. It is possible to more reliably prevent a peeling / removal error.
[Brief description of the drawings]
[Figure 1]Reference exampleIt is a figure which shows the structure and operation | movement of the principal part of the plate discharging apparatus in FIG., Comprising: It is a partial cross section front view showing the state which occupies the peeling position under the plate discharging roller.
[Figure 2]Reference exampleIt is a partial cross section front view of the principal part which shows the structure under the discharged-plate roller in.
[Fig. 3]Reference exampleIt is a partial cross section front view of the principal part which shows the scraping peeling operation | movement of the rear-end surface of the master rear-end part by the bottom of the discharged-plate roller in FIG.
[Fig. 4]Reference exampleIt is a partial cross section front view of the principal part which shows the scraping peeling operation | movement on the master rear-end edge part by under the plate-rolling roller.
[Figure 5]Reference exampleIt is a partial cross section front view of the principal part which shows the scraping peeling operation | movement on the master rear-end edge part under the discharged-plate roller in the modification 1 of.
[Fig. 6]Reference exampleIt is a perspective view of the principal part which shows the arrangement | positioning state under the discharged-plate roller in the modification 2 of.
[Fig. 7]Of the present inventionImplementation formStateIt is a figure which shows the structure and operation | movement of the principal part of the plate discharging apparatus in this, Comprising: It is a partial cross section front view showing the state which occupies the peeling position under the plate discharging roller.
FIG. 8 is an enlarged front view of part a in FIG. 7;
FIG. 9 is a perspective view of a main part showing an example of scraping means for discharged plate rollers according to another embodiment of the present invention.
FIG. 10 is a perspective view of the main part showing an example of scraping means for discharged plate rollers in still another embodiment of the present invention.
FIG. 11 is a schematic front view of a conventional stencil printing apparatus to which an embodiment of the present invention is applied.
[Explanation of symbols]
  1,10 Plate removal device
  2,2A, 5 Under the discharged plate roller as the discharged plate roller
  3 Grooves with scraping means
  4 Scraping corners as scraping means
  6 Fins with scraping means
  7 Scraping protrusion as scraping means
  15,20 Discharge roller
  16 Scraping ridges as scraping means
  21 Scraping convex part as scraping means
  61 Master
  101 Plate cylinder

Claims (3)

In the plate discharging apparatus in the printing apparatus having the plate discharging roller for peeling the used master from the outer peripheral surface of the plate cylinder,
In a plurality of locations on the outer peripheral portion of the discharge roller, scraping means for scraping the used master is provided, and a plurality of elastically deformable fins protruding substantially radially from the outer periphery of the discharge roller are formed.
The plate removing device in a printing apparatus , wherein the scraping means comprises a scraping protrusion provided on the fin in the downstream side in the rotation direction of the plate discharging roller . In the printing apparatus according to claim 1 ,
The scraping device in the printing apparatus is characterized in that the scraping means are alternately arranged along the generatrix direction of the discharging plate roller and in the outer peripheral direction . In the plate discharging apparatus in the printing apparatus according to claim 1 or 2,
The master is a synthetic fiber base master in which a porous support containing synthetic fibers and a thermoplastic resin film are bonded together .

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