JP2006181928A - Method for mounting printing plate and mounting assist - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for mounting a printing plate which enables easy mounting of a sheet-like printing plate upheld by a plastic support, onto a plate cylinder of a printer and can ensure successful workability for mounting and mounting precision, and a mounting assist for the printing plate. <P>SOLUTION: In this method for mounting a printing plate, when the sheet-like printing plate 5 upheld by the plastic support is mounted onto the plate cylinder of the printer, the tip part 5c of the printing plate 5 is fixed to a plate-like member 11 with a somewhat larger width than the width W of the printing plate 5 in the way that the tip part 5c is protruded, and the protruded tip part 5c of the printing plate 5 is inserted into a clamp of the chucking side installed on the plate cylinder. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mounting method and a mounting auxiliary device for mounting a sheet-like printing plate supported by a plastic support on a holding side clamp provided on a plate cylinder of a printing press.

  Planographic printing plates include aluminum printing plates that use aluminum plates such as PS plates and thermal printing plates as supports, and printing plates that use paper or plastic resin films as supports such as silver salt printing plates and electrophotographic printing plates. It has been known. Among these printing plates, aluminum printing plates dominate, so the printing presses and peripheral equipment used for lithographic printing are designed to match the aluminum printing plates and support paper and plastic resin films. The printing plate used as a body is inferior in rigidity (stiffness) compared to the aluminum printing plate, so when placing the plate on the printing press, the operator must hold the tip of the printing plate and insert it by hand. Problems such as poor nature occurred.

  For example, in the following Patent Document 1 (see FIG. 1), in order to attach a printing plate having a plastic resin film as a support to the holding side clamp with high positional accuracy, the sheet-like printing plate material of the plastic support is used in a printing machine. At the time of mounting, after the rear end of the printing plate is abutted against and fixed to a fixing member provided at the crossing portion, the printing plate is bent and inserted in the clamp on the side using the deflection of the printing plate.

However, the printing plate mounting method described above has the following problems.
(1) The rear end of the printing plate is abutted against the fixing member. However, the fixing of the printing plate is not sufficient, and if it is curved, the printing plate is detached from the member. The nature was bad.
(2) Since the printing plate is pressed against the floor surface to perform the above-mentioned holding, the printing surface of the printing plate may rub against the floor surface, which may damage the printing surface, which may lead to poor image quality of the final printed matter.
(3) The operator must hold the tip of the printing plate by hand and insert it into the gap between the clamps, and care must be taken to prevent bending and undulation of the printing plate. Workability was bad.
(4) Since the work space for mounting the printing plate is narrow, two persons are required to perform the insertion.
JP 2002-347212 A

  In view of the above-described problems of the prior art, the present invention makes it easy to mount a sheet-like printing plate supported by a plastic support on a plate cylinder of a printing press, and mounts a printing plate with high mounting workability and mounting accuracy. It is an object of the present invention to provide a method and a printing plate mounting auxiliary device.

  In order to achieve the above object, the printing plate mounting method according to the present invention is slightly wider than the width of the printing plate when the sheet-like printing plate supported by the plastic support is mounted on the plate cylinder of the printing press. The printing plate is fixed to a plate member having a width in a protruding state, and the protruding printing plate is inserted into a holding side clamp provided on the plate cylinder.

  According to this printing plate mounting method, the sheet-like printing plate is fixed to the plate-like member with the leading end of the printing plate protruding, so that the printing plate can be handled integrally with the plate-like member. The bending of the front end of the plate can be regulated by the plate-like member, and the printing plate can be held in a substantially flat state. For this reason, the operator can easily insert the front end of the printing plate into the narrow gap of the holding side clamp with a plate-like member, and attach the sheet-like printing plate supported by the plastic support to the plate cylinder of the printing press. The mounting workability is improved, and the mounting accuracy is improved because the tip of the printing plate can be finely adjusted when mounted on the holding side clamp.

  In the mounting method of the printing plate, the plate-like member preferably has a length of 1/3 or less with respect to the length of the printing plate. As a result, the plate-like member can be made smaller with respect to the printing plate, the weight can be reduced and the handling becomes easy, and the mounting workability is further improved.

  Moreover, it is preferable to fix the printing plate to the plate-like member by a fixing means for holding a part of both sides of the printing plate. By holding both sides of the printing plate, the printing plate can be held in a substantially flat state, so that the fixing means can be made to the minimum necessary size and contribute to weight reduction of the plate-like member.

  Further, since the fixing means can be arbitrarily fixed and released, the printing plate can be held until the leading end of the printing plate is inserted into the holding side clamp, and fixed immediately before the printing plate is wound around the plate cylinder. Can be released, improving workability.

  Further, a dripping prevention member for the printing plate may be provided on the opposite side of the front end portion of the printing plate of the plate member to prevent dripping on the rear end portion side of the printing plate. Thereby, even when the plate-like member is configured to be short and light in weight, the printing plate can be prevented from sagging, and a longer portion than the plate-like member of the printing plate does not get in the way when the printing plate is mounted. For this reason, it is not necessary to enlarge a plate-shaped member, and it can reduce in weight.

  Further, by providing a scratch-proof material on the contact surface of the plate-like member with the printing plate, it is possible to reliably prevent the printing surface of the printing plate from being scratched when the printing plate is mounted, and printing on the plate-like member. The sticking of the plate can be prevented. Examples of the scratch-preventing material include a flocked or pile-woven fabric, a slippery sheet and a non-woven fabric.

The plastic support has a Young's modulus in the range of 4500 to 6500 N / mm ² and a thickness in the range of 100 to 250 μm. The printing plate has at least a hydrophilic layer and a thermosensitive layer on the plastic support. It is preferable to have an image forming layer.

The material of the plastic support is preferably polyethylene terephthalate. The plastic support preferably has a thickness in the range of 170 to 180 μm. The Young's modulus of the plastic support is preferably in the range of 5000 to 6000 N / mm ² .

  A printing plate loading assistance device according to the present invention is a loading assistance device for loading a sheet-shaped printing plate on a plate cylinder of a printing press, and fixes the printing plate having a width slightly larger than the width of the printing plate. And a front end portion of a printing plate fixed to the plate-like member can be inserted into a holding side clamp provided in the plate cylinder.

  According to this printing plate mounting auxiliary device, since the sheet-like printing plate is fixed to the plate-like member, the printing plate can be handled integrally with the plate-like member, and the deflection of the leading end of the printing plate can be handled by the plate-like member. The printing plate can be held in a substantially flat state. For this reason, the operator can easily insert the front end of the printing plate into the narrow gap of the holding side clamp with a plate-like member, and attach the sheet-like printing plate supported by the plastic support to the plate cylinder of the printing press. The mounting workability is improved, and the mounting accuracy is improved because the tip of the printing plate can be finely adjusted when mounted on the holding side clamp.

  In the printing plate mounting assistance device, it is preferable that the plate member has a length of 1/3 or less of the length of the printing plate. Thereby, a plate-shaped member can be made small with respect to the printing plate, the mounting auxiliary device can be reduced in weight, and handling is facilitated, so that mounting workability is further improved.

  Moreover, it is preferable to provide a fixing means for holding part of both sides of the printing plate in order to fix the printing plate to the plate-like member. By holding both sides of the printing plate by the fixing means, the printing plate can be held in a substantially flat state, so that the fixing means can be made to the minimum size and contribute to the weight reduction of the mounting assistance device.

  Moreover, it is preferable that the fixing means is configured to be arbitrarily fixed and unfixable. Thus, the printing plate can be kept in the holding state until the leading end of the printing plate is inserted into the holding side clamp, and the fixing can be released immediately before the printing plate is wound around the plate cylinder, thereby improving the mounting workability.

  Moreover, it is preferable to provide the dripping prevention member which prevents dripping of the said printing plate on the opposite side of the front-end | tip part of the said printing plate of the said plate-shaped member. As a result, even when the plate-like member is configured to be short and light in weight, it is possible to prevent the trailing end of the printing plate from sagging, and a longer part than the plate-like member of the printing plate is obstructed when the printing plate is mounted do not become. For this reason, it is not necessary to enlarge a plate-shaped member, and a mounting assistance apparatus can be reduced in weight.

  It is preferable to provide a scratch preventing means on the contact surface of the plate-like member with the printing plate. Accordingly, it is possible to surely prevent the printing surface of the printing plate from being damaged when the printing plate is mounted, and to prevent the printing plate from sticking to the plate-like member. Examples of the scratch-preventing material include a flocked or pile-woven fabric, a slippery sheet and a non-woven fabric.

  According to the printing plate mounting method and the printing plate mounting auxiliary device of the present invention, it is easy to mount the sheet-shaped printing plate supported by the plastic support on the plate cylinder of the printing press, and the mounting workability and mounting accuracy are improved. .

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  <First Embodiment>

  FIG. 1 is a front view (a), a side view (b), and a rear view (c) of a printing plate loading assistance device according to a first embodiment.

  As shown in FIGS. 1 (a), (b), and (c), the printing plate mounting assist device 10 is a sheet-like printing plate 5 supported by a plastic support (shown by a one-dot chain line in FIG. 1 (a)). ) Is attached to the plate cylinder of the printing press so that the mounting can be assisted. The plate-like member 11 is slightly wider than the width W of the printing plate 5 and has rigidity, and both side portions of the printing plate 5. Is formed in a substantially loop shape from a pair of plate-like fixing portions 12 and 13 provided on the surface 11a side of the plate-like member 11 and a rod-like member to hold and fix a part of the plate-like member 11 at both ends. In addition, a dripping prevention member 14 of the printing plate 5 and a handle portion 15 provided on the back surface 11b side of the plate member 11 so that the operator can hold the plate member 11 by hand.

  As shown in FIG. 1B, the fixing portions 12 and 13 are provided at both ends of the surface 11a of the plate-like member 11, and are configured to be rotatable around the rotation shafts 12a and 13a. A biasing member (not shown) is urged and pressed against the surface 11a of the plate-like member at the position indicated by a solid line in the figure. The fixed portions 12 and 13 are configured to rotate to the positions of the broken lines in the drawing against the urging force of the urging member by pushing the end portions 12b and 13b downward in the drawing. When the fixing portions 12 and 13 are in the broken line positions in the figure, when the end portions 12b and 13b are released after placing the printing plate 5 on the surface 11a of the plate-like member 11, the fixing portions 12 and 13 return to the solid line positions in the figure. The both ends of the printing plate 5 are sandwiched and held between the surface 11a of the plate member 11 and fixed.

  The plate-like member 11 is configured to have a length of 1/3 or less with respect to the length L of the printing plate 5. Thereby, the plate-shaped member 11 can be shortened compared with the length L of the printing plate 5, and weight reduction of the mounting | wearing assistance apparatus 10 can be achieved. As shown in FIG. 1A, when the printing plate 5 is fixed to the mounting assisting device 10, it is held and fixed so that the leading end 5c of the printing plate 5 protrudes. At this time, the leading end of the printing plate 5 is fixed. Even if the plate-like member 11 is configured to be short by supporting the opposite side of the plate 5c with the sag-preventing member 14, the portion of the printing plate 5 that is longer than the plate-like member 11 is not hung when the printing plate 5 is mounted. do not become.

  Further, the surface 11a of the plate-like member 11 in FIG. 1A is provided with an anti-scratch film, which protects the printing surface of the printing plate 5 that comes into contact, and the printing surface is damaged when the printing plate is mounted. And the sticking of the printing plate 5 to the plate-like member 11 can be prevented. As such an anti-scratch film, a flocked or pile-woven material is affixed to a cloth, but a slippery sheet or a non-woven fabric may be used.

  Next, the plate cylinder of the printing press on which the printing plate is mounted will be described with reference to FIGS. FIG. 2 is a side view schematically showing a plate cylinder and a blanket cylinder of a printing press to which the mounting assisting device of FIG. 1 can be applied. FIG. 3 is a side view (a) showing the structure of the holding side clamp of the plate cylinder of FIG. 2 with the upper blade closed, and a side view (b) showing the upper blade opened.

  The color printing machine includes four units for four colors Y, M, C, and K, each of which includes a plate cylinder 1, a blanket cylinder 2, an impression cylinder, and a transfer cylinder (not shown) as shown in FIG. As shown in FIG. 2, the plate cylinder 1 has a holding side clamp 210 and a butt side clamp 310. As shown in FIG. 3A, the holding side clamp 210 includes a lower blade 230 and an upper blade 220. The upper blade 220 is rotated by a rotating shaft 250 by a cam or a spring (not shown), and the lower blade 230 is rotated. It is attached so that it can be opened and closed. The lower blade 230 is provided with a plurality of positioning pins 240 in the rotational axis direction (perpendicular to the paper surface) of the plate cylinder 1, and the notches of the printing plate 5 (FIG. 2) are engaged and positioned.

  When the printing plate 5 is mounted, as shown in FIG. 3B, the upper blade 220 is rotated and opened by the rotation shaft 250, and a gap 260 is formed between the upper blade 220 and the lower blade 230. . Thus, the printing plate 5 is mounted by inserting the holding side end of the printing plate 5 through the gap 260 while the lower blade 230 and the upper blade 220 of the holding side clamp 210 are open, and closing the upper blade 220. It has become so.

  In some types of printing press, the lower blade is attached to the upper blade so as to be openable and closable.

  Next, a preferable printing plate applied to the printing machine of FIG. 2 will be described with reference to FIG. FIG. 4 is a cross-sectional view schematically showing the layer structure of the printing plate in the present embodiment.

  As shown in FIG. 4, the sheet-like printing plate 5 has at least a hydrophilic layer 51 and a heat-sensitive image forming layer 52 on a plastic support 50. For example, the printing plate 5 is wound around a drum of a printing plate manufacturing apparatus, and the drum is rotated, and image data is scanned and exposed by a light source to record an image.

  Further, the sheet-like printing plate 5 is formed with a notch corresponding to the positioning pin 240 provided on the lower blade 230 of the holding side clamp of the plate cylinder 1 to form the positioning recesses 5a and 5b. Yes. Further, depending on the type of printing press, the printing plate 5 is bent at the rear end side.

  Examples of the plastic support 50 of the printing plate 5 include polyesters such as polyethylene terephthalate and polyethylene naphthalate, polyimide, polyamide, polycarbonate, polysulfone, polyphenylene oxide, and cellulose esters. Particularly preferred are polyester films such as polyethylene terephthalate and polyethylene naphthalate.

For the plastic support 50, polyethylene terephthalate is particularly preferable from the viewpoint of transportability, ease of handling, and the like. In the printing plate preparation apparatus, if the thickness of the plastic support is too thin or too thick, it is difficult to form a roll and the transportability is improved. There is a problem, and if it is too thin, there is a problem such as lack of strength when it is carried to the printing machine in the next step, and the thickness of the plastic support 50 is preferably 100 to 250 μm from the viewpoint of transportability, ease of handling, etc. Most preferably, it is 170-180 micrometers. Moreover, the plastic support 50 preferably has a Young's modulus in the range of 4500 to 6500N / mm ^2, and more preferably in the range of 5000 to 6000 N / mm ^2.

  The hydrophilic layer 51 of the printing plate 5 is a layer having a function of not depositing printing ink at the time of printing. As a material for forming the hydrophilic layer 51, an organic hydrophilic polymer is crosslinked or pseudo-crosslinked. Preferably used are organic hydrophilic matrix structures obtained, inorganic hydrophilic matrix structures obtained by sol-gel conversion comprising hydrolysis, condensation reaction of polyalkoxysilane, titanate, zirconate or aluminate, and metal oxides. . The hydrophilic layer 51 preferably includes metal oxide fine particles, and examples thereof include colloidal silica, alumina sol, titania sol, and other metal oxide sols.

  The heat-sensitive image forming layer 52 of the printing plate 5 is a layer capable of forming an image by heating, and contains heat-melting fine particles and / or heat-fusible fine particles. The heat-meltable fine particles are fine particles formed of a material that has a low viscosity when melted, and is generally classified as a wax, among thermoplastic materials. The heat-fusible fine particles include thermoplastic hydrophobic polymer polymer fine particles, and there is no specific upper limit for the softening temperature of the thermoplastic hydrophobic polymer polymer particles. The temperature is preferably lower than the decomposition temperature of the fine particles.

  Next, a mounting method for setting the sheet-like printing plate 5 supported by the plastic support 50 of FIG. 4 to the holding side clamp of the plate cylinder 1 of FIG. 2 using the mounting assisting device 10 of FIG. This will be described with reference to FIGS.

  FIG. 5 is a side view of an essential part schematically showing how the printing plate is mounted on the plate cylinder of FIG. 2 by the mounting assisting device of FIG. FIG. 6 is a side view of an essential part showing a state in which a sheet-like printing plate is inserted between the lower blade and the upper blade of the holding side clamp in FIG. FIG. 7 is a plan view showing the positioning pins and the printing plate of the plate cylinder of FIG.

  First, the plate cylinder 1 is rotated and held at the position shown in FIGS. 2 and 5 such that the gap 260 between the lower blade 230 and the upper blade 220 of the holding side clamp 210 in FIG. Normally, in the case of a color printing machine, the plate cylinder 1 is set to automatically come to the position shown in FIGS.

  As shown in FIG. 1A, the printing plate 5 is fixed to the plate-like member 11 of the mounting auxiliary device 10 by the fixing portions 12 and 13. At this time, the printing plate 5 is held so that the front end portion 5 c slightly protrudes from the opposite side of the plate-like member 11 to the sag prevention member 14. As a result, the printing plate 5 can be handled integrally with the plate-like member 11, the bending of the front end portion 5 c of the printing plate 5 can be restricted by the plate-like member 11, and the bending of the front end portion 5 c does not occur. 5 can be held in a substantially flat state on the tip 5c side.

  Next, as shown in FIG. 5, the operator causes the leading end portion 5 c of the printing plate 5 protruding from the plate-like member 11 to approach the holding side clamp 210 obliquely from above while grasping the mounting assist device 10 with the handle portion 15. Then, when the printing plate 5 is inserted into the gap 260 between the lower blade 230 and the upper blade 220 from the tip portion 5c as shown in FIG. 6, the printing plate 5 is formed at the tip portion 5c as shown in FIG. The positioning recesses 5 a and 5 b engage with the positioning pins 240 of the lower blade 230 of the holding side clamp 210. As a result, the printing plate 5 is positioned at a predetermined position of the holding side clamp 210 of the plate cylinder 1.

  Further, by moving the plate-like member 11 while being gripped by the handle portion 15, fine adjustment can be performed when the leading end portion 5 c of the printing plate 5 is mounted on the holding side clamp, so that mounting accuracy is improved. Further, during the above-described operation, the rear end side of the printing plate 5 is held so as not to sag by the sag preventing member 14, so that the rear end side of the printing plate 5 does not interfere with the operation.

  Next, the fixing of the mounting auxiliary device 10 by the fixing portions 12 and 13 is released, and the mounting auxiliary device 10 is removed from the printing plate 5.

  Next, as shown in FIG. 3A, the upper blade 220 is rotated and closed with respect to the lower blade 230, whereby the printing plate 5 is mounted and set on the holding side clamp 210. Thereafter, the printing plate 5 is wound around the outer periphery of the plate cylinder 1 by approximately one turn, and the rear end thereof is attached to the butt side clamp 310.

  As described above, according to the printing plate mounting method by the mounting assisting device of the present embodiment, the following operational effects can be obtained.

  (1) Since the printing plate 5 and the plate-like member 11 can be handled as a single unit and the front end portion 5c of the printing plate 5 can be held almost planarly, it can be easily inserted into the narrow gap of the holding-side clamp 210 and the mounting workability is improved. To do. Further, since the plate-like member 11 is smaller than the printing plate 5, the mounting assisting device 10 can be reduced in weight, easy to handle, and mounting workability is improved.

  (2) Since the printing plate 5 can be held by holding only both sides of the printing plate 5, the fixing portions 12 and 13 can be reduced to the minimum necessary size, and the mounting assisting device 10 can be reduced in weight. Further, since the fixing portions 12 and 13 can be arbitrarily fixed, opened and released, the printing plate 5 can be kept in a holding state until the leading end portion 5c of the printing plate 5 is inserted into the holding side clamp 210. Immediately before the plate 5 is wound around the plate cylinder 1, the fixation can be released, and the mounting workability is improved.

  (3) By providing the sagging prevention member 14, it is possible to prevent the printing plate from sagging due to the short plate-like member 11, and the longer part than the plate-like member 11 does not get in the way when the plate is mounted, For this reason, it is not necessary to enlarge the plate-shaped member 11, and the mounting assistance apparatus 10 can be reduced in weight.

  (4) The mounting assist device 10 is lightweight, has a good mounting workability, and improves the handleability of the printing plate 5. Therefore, rubbing of the printing surface with the floor surface can be avoided, and the risk of damaging the printing surface is reduced. In addition, there is less risk of leading to poor image quality of the final printed matter, and mounting work is facilitated even in a narrow work space of the printing press.

  (5) Although the plate cylinder 1 of the printing machine may be designed to match the aluminum printing plate, the thickness of the aluminum support of the aluminum printing plate is, for example, 250 μm, and the plastic support 50 of FIG. When the thickness of the printing plate is 200 μm and the aluminum printing plate is thicker than the printing plate 5 supported by the plastic support 50, the following block of about 50 μ thickness is used to compensate for the difference in thickness. In this way, it is set between the plate cylinder 1 and the printing plate 5. As shown in FIG. 6, a plate 6 (shown by a broken line in the figure) is placed on the printing plate 5 on the plate-like member 11 of the attachment assisting device 10 and held and fixed by the fixing portions 12 and 13 in the same manner as described above. In this state, the plate 6 can be easily attached to the plate cylinder 1 together with the printing plate 5 simply by being inserted into the clamp 210 together with the printing plate 5 in the same manner as described above.

  <Second Embodiment>

  Next, a second embodiment in which locking and unlocking of the fixing portion in FIGS. 1A to 1C are automated will be described with reference to FIGS. FIG. 8 is a plan view of a printing plate loading assistance device according to the second embodiment. FIG. 9 is a top view of the mounting assistance device of FIG. FIG. 10 is a plan view (a) showing a fixing part releasing mechanism provided in the handle part of the plate-like member in FIG. 8, a side view (b) showing the fixing part in the released state, and a side view showing the fixing part in the holding and fixing state. (C).

  As shown in FIGS. 8 to 10 (a), the printing plate mounting assistance device 10 ′ according to the second embodiment includes a plate-like member 11 similar to FIGS. 1 (a) to 1 (c), and a drooping prevention member. 14, a handle portion 15 a provided on the back surface 11 b side of the plate-like member 11, fixing portions 25 and 35 for holding and fixing a part of both sides of the printing plate 5 at both ends of the plate-like member 11, In the housing of the handle portion 15a, a fixing portion releasing mechanism for automatically releasing the fixing by the fixing portions 25 and 35 by remote operation is disposed.

  Since the fixing portions 25 and 35 have the same configuration, the fixing portion releasing mechanism will be described below centering on the fixing portion 25 side.

  When the release button 21 shown in FIGS. 8 to 10A is pushed in the direction indicated by the arrow a in FIG. 10A, the turning portion 22 turns around the turning center portion 22a in the turning direction b shown in the figure. The guide portions 23a and 24a move in the arrow direction c in FIG. By this movement, the wires 23 and 24 coupled to the guide portions 23a and 24a are also pulled and moved in the arrow direction c, so that the printing plate 5 is fixed by the fixing portions 25 and 35 of FIGS. 10B and 10C. It is to be released.

  As shown in FIGS. 10B and 10C, the contact surface of the fixing portion 25 that holds and fixes the printing plate 5 on the surface 11a of the plate-like member 11 is made of an elastic member such as rubber. A contact portion 26 is disposed.

  The fixed portion 25 is rotatable at a rotation center portion 27 with respect to a bracket 30 provided at an end portion of the plate-like member 11, and a biasing member (illustrated) such as a spring provided at the rotation center portion 27. (Omitted) is biased so as to be locked at the release position of FIG.

  When the fixed portion 25 in the released state is rotated in the rotation direction d in the figure as shown in FIG. 10B, the fixed portion 25 rotates against the urging force of the urging member, and the fixed portion 25 is covered. The locking portion 28 is locked in the locking recess 31a of the locked portion 31 that is rotatably disposed in the bracket 30, whereby the locking portion 28 is locked at the fixed position in FIG. Thereby, the fixing portion 25 is pressed against the surface 11 a of the plate-like member 11, and the printing plate 5 is held and fixed by being sandwiched between the surface 11 a and the contact portion 26 by a part of the end portion of the plate-like member 11.

  When releasing the fixing by the fixing portion 25 in the holding and fixing state as shown in FIG. 10C, when the release button 21 of the handle portion 15a in FIG. When pulled and moved in the direction c, the tip of the wire 23 in FIG. 10C rotates the locked portion 31 in the rotation direction e of the drawing via the rotation shaft 30a of the locked portion 31. As a result, the locking of the locked portion 28 of the fixing portion 25 with the locking recess 31a is released, and the fixing portion 25 is rotated to the releasing position of FIG. 10B by the biasing force of the biasing member. Then, the fixing part 25 is separated from the surface 11a to release the holding and fixing of the printing plate 5. Note that the above-described fixing portion release mechanism is also operated almost simultaneously at the other fixing portion 35 at the other end of the plate-like member 11 by the wire 24.

  8, 9, and 10 (c), the printing plate 5 is fixed to the plate-like member 11 of the mounting assisting device 10 ′ by the fixing portions 25 and 35, and the printing plate as shown in FIGS. 5 and 6. 5 is inserted into the holding-side clamp 210, and the fixing portion 25 is easily held and fixed at both ends of the plate-like member 11 simply by operating the release button 21 of the handle portion 15a in FIG. Can be released. As a result, the holding and fixing can be released in a timely manner immediately before the printing plate 5 is wound around the plate cylinder 1, and the mounting workability is further improved.

  Further, when the printing plate 5 is held and fixed to the plate-like member 11, the printing plate 5 is placed on the surface 11 a of the plate-like member 11 in a state where the fixing portions 25 and 35 are locked at the release position of FIG. Since the printing plate 5 can be easily held in the mounting auxiliary device 10 ', the mounting workability is further improved.

  As described above, according to the printing plate mounting method by the printing plate mounting assisting device 10 ′ of the second embodiment, the same operations as the effects (1) to (5) of the first embodiment. In addition, the printing plate 5 can be easily held and fixed and released, and the mounting workability is further improved.

  As described above, the best mode for carrying out the present invention has been described. However, the present invention is not limited to these, and various modifications are possible within the scope of the technical idea of the present invention. For example, the mounting assist device 10 of the present embodiment is suitable for use when mounting a sheet-like printing plate supported by a plastic support on a plate cylinder of a printing machine. Of course, it can also be used for mounting.

It is the front view (a), side view (b), and back view (c) of the printing plate mounting assistance device according to the first embodiment. FIG. 2 is a side view schematically showing a plate cylinder and a blanket cylinder of a printing press to which the mounting auxiliary device of FIG. 1 can be applied. FIG. 3 is a side view (a) showing the structure of the holding side clamp of the plate cylinder of FIG. 2 with the upper blade closed, and a side view (b) showing the upper blade opened. It is sectional drawing which shows typically the layer structure of the printing plate in this Embodiment. It is a principal part side view which shows a mode that a printing plate is mounted | worn with the mounting assistance apparatus of FIG. 1 with respect to the plate cylinder of FIG. It is a principal part side view which shows a mode that a sheet-like printing plate is inserted between the lower blade and upper blade of the holding side clamp of FIG.3 (b). FIG. 7 is a plan view showing the positioning pins and the printing plate of the plate cylinder of FIG. It is a top view of the mounting assistance apparatus of the printing plate by 2nd Embodiment. FIG. 9 is a top view of the mounting assistance device of FIG. 8. The top view (a) which shows the fixing | fixed part release mechanism provided in the handle part of the plate-shaped member of FIG. 8, the side view (b) which shows the fixing | fixed part of a cancellation | release state, and the side view (c) which shows the fixing | fixed part of a holding | maintenance fixing state It is.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plate cylinder of printing machine 5 Sheet-like printing plate, printing plate 5c Front-end | tip 6 Under-plate 10,10 'Mounting auxiliary device 11 Plate-like member 11a Front surface 11b Back surface 12, 13 Fixing part 14 Dripping prevention member 15, 15a Handle part 25 , 35 Fixing portion 26 Contact portion 50 Plastic support 51 Hydrophilic layer 52 Heat-sensitive image forming layer 210 Mouth side clamp 260 Gap 310 Bottom side clamp L Length of printing plate W Printing plate width

Claims (16)

  When mounting a sheet-like printing plate supported by a plastic support on a plate cylinder of a printing press, with the leading end of the printing plate protruding from a plate-like member having a width slightly wider than the width of the printing plate A method for mounting a printing plate, comprising fixing and inserting the protruding front end portion of the printing plate into a holding side clamp provided in the plate cylinder.   2. The printing plate mounting method according to claim 1, wherein the plate-like member has a length of 1/3 or less of the length of the printing plate.   The method for mounting a printing plate according to claim 1 or 2, wherein the fixing of the printing plate to the plate-like member is performed by a fixing means for holding a part of both sides of the printing plate.   The method for mounting a printing plate according to claim 3, wherein the fixing means can be arbitrarily fixed and released.   5. The printing plate dripping prevention member is provided on the opposite side of the front end portion of the printing plate of the plate-like member to prevent dripping on the rear end side of the printing plate. 2. A printing plate mounting method according to claim 1.   The method for mounting a printing plate according to any one of claims 1 to 5, wherein a scratch preventing means is provided on a contact surface of the plate-like member with the printing plate. The plastic support has a Young's modulus in the range of 4500 to 6500 N / mm ² and a thickness in the range of 100 to 250 μm;
7. The printing plate mounting method according to claim 1, wherein the printing plate has at least a hydrophilic layer and a heat-sensitive image forming layer on the plastic support.   8. The printing plate mounting method according to claim 1, wherein the plastic support is made of polyethylene terephthalate. The method for mounting a printing plate according to any one of claims 1 to 8, wherein a thickness of the plastic support is in a range of 170 to 180 µm. 10. The printing plate mounting method according to claim 1, wherein a Young's modulus of the plastic support is in a range of 5000 to 6000 N / mm ² . A mounting assistance device for mounting a sheet-like printing plate on a plate cylinder of a printing press,
A plate-like member for fixing the printing plate having a width slightly larger than the width of the printing plate is provided, and the leading end of the printing plate fixed to the plate-like member can be inserted into a holding side clamp provided in the plate cylinder A printing plate mounting assistance device, characterized in that   12. The printing plate loading assist device according to claim 11, wherein the plate-like member has a length of 1/3 or less of the length of the printing plate.   13. The printing plate mounting assistance device according to claim 11 or 12, further comprising a fixing unit that holds part of both sides of the printing plate in order to fix the printing plate to the plate-like member.   14. The printing plate loading assistance device according to claim 13, wherein the fixing means can be arbitrarily fixed and released.   The mounting of the printing plate according to any one of claims 11 to 14, further comprising a dripping prevention member for preventing dripping of the printing plate on a side opposite to a front end portion of the printing plate of the plate-like member. Auxiliary device. The printing plate mounting auxiliary device according to any one of claims 11 to 15, further comprising a scratch preventing means on a contact surface of the plate-like member with the printing plate.

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