JP2006035561A - Printing plate bending device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printing plate bending device which enables a sheet-like printing plate material supported by a plastic support to be easily unloaded manually by an operator after setting the material in a printing plate setting part and bending an edge portion of the material. <P>SOLUTION: This printing plate bending device comprises the printing plate setting part 13 which can set the sheet-like printing plate supported by the plastic support and the bending mechanism part 11 which bends the edge portion of the set printing plate. In addition, the printing plate setting part 13 has recessed parts 91 and 92 which are dented from the surface near the bending mechanism part 11 and can handle the printing plate. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a printing plate bending apparatus for bending an edge portion of a sheet-like printing plate material supported by a plastic support.

  The bending apparatus for resin printing plates is known in the following Patent Documents 1 to 4. However, in order to take out the folded printing plate in such a conventional bending apparatus, the left and right ends are grasped by hand. In addition, in a part of the folding apparatus for an aluminum printing plate, a pin or block that can protrude from the surface is embedded in the vicinity of the bending mechanism, and the printed printing plate is lifted by the pin or block.

  However, the printing plate is normally adsorbed and fixed to the printing plate setting part by an adsorption mechanism, but the printing plate and the printing plate setting part are in close contact with each other because the vacuum state is maintained even when the adsorption mechanism is stopped. It was in a state, and it was difficult to take out the printing plate after bending.

  Also, even if a hole is provided at a position away from the folding mechanism, the aluminum printing plate can take out the folded printing plate with the rigidity of the aluminum itself, but the resin printing plate has low rigidity, and the curling of the printing plate by curling is also possible. The bent tip is difficult to lift and difficult to remove.

Further, even if the printing plate is lifted by the embedded pin or block, the leading end of the printing plate is bent, so that the leading end is caught by the pin or block when the printing plate is taken out. In addition, a mechanism for retracting and projecting the pins or blocks is necessary, which complicates the apparatus and increases the number of parts, leading to an increase in the cost of the apparatus.
Japanese Patent Laid-Open No. 02-102049 JP 08-295008 A JP 2000-190456 A JP 2002-254601 A

  In view of the problems of the prior art as described above, the present invention provides a printing plate material after a sheet-like printing plate material supported by a plastic support is set on a printing plate set portion and its edge is bent. It is an object of the present invention to provide a printing plate bending apparatus in which an operator can easily take out a printing plate by hand.

  In order to achieve the above object, a printing plate bending apparatus according to the present invention includes a printing plate set portion on which a sheet-like printing plate material supported by a plastic support can be set, and an edge portion of the set printing plate material. A bending mechanism section for folding the printing plate, and the printing plate set section has a recess that can be recessed from the surface and handle the printing plate material in the vicinity of the bending mechanism.

  According to this printing plate bending apparatus, since the concave portion recessed from the surface is provided in the printing plate setting portion in the vicinity of the folding mechanism, a space is created between the lower surface and the concave portion of the printing plate material set in the printing plate setting portion. From this space, the operator can easily remove the printing plate material by inserting his / her finger and lifting the printing plate material. In addition, since the concave portion is in the vicinity of the folding mechanism, even if the printing plate material is supported by the plastic support and the rigidity is low or the curl is generated, the bent portion where the edge portion of the printing plate is bent is the printing plate. It can be reliably removed without being caught by the end of the set part. From the above, even if the printing plate material is held and sucked even after the suction is released in the printing plate setting part, the operator easily takes out the folded printing plate material at the edge part by hand. be able to.

  In the printing plate bending apparatus, the concave portion may be formed in a bottomed groove shape or a penetrating hole shape. The concave portion may include a bottomed groove-like portion and a penetrating hole-like portion.

  Moreover, it is preferable that the said recessed part is independently provided in two places at the right-and-left end of the printing plate material set to the said printing plate setting part. By forming the concave portions independently on the left and right sides of the printing plate material, the strength of the printing plate set portion can be maintained as compared with the case where the concave portions are formed continuously in the left-right width direction. When the printing plate material is set in the printing plate setting section, a part of each recess is covered with the printing plate material, the other part is exposed on the surface, and the printing plate material is taken out by inserting a hand from the exposed part on the surface. be able to.

  Moreover, it is preferable that the dimension of the said recessed part in the vertical direction orthogonal to the left-right width direction of the printing plate material set to the said printing plate set part is at least 30 mm. This facilitates the operation of taking out the printing plate material.

  Further, when the printing plate material of the maximum size is set in the printing plate setting section, it is preferable that the concave portion is expanded at least 15 mm outward in the width direction from the left and right ends of the printing plate material. Thereby, the taking-out operation | movement of the printing plate material of the largest size becomes easy.

  Moreover, when the printing plate material of the minimum size is set in the printing plate setting part, it is preferable that the concave portion is expanded at least 20 mm or more inward in the width direction from the left and right ends of the printing plate material. Thereby, the taking-out operation | movement of the printing plate material of minimum size becomes easy.

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 material has at least a hydrophilic layer and a heat-sensitive 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. Furthermore, the Young's modulus of the plastic support is preferably in the range of 5000 to 6000 N / mm ² .

  According to the printing plate bending apparatus of the present invention, after the sheet-like printing plate material supported by the plastic support is set in the printing plate setting portion and the edge portion thereof is bent, the operator can remove the printing plate material. Can be easily removed by hand. Further, since the printing plate material is supported by the plastic support, even if the rigidity is low or curl is generated, the bent portion of the edge portion of the printing plate is surely removed without being caught by the edge portion of the printing plate setting portion. be able to.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view for schematically explaining printing plate folding steps (a) to (c) that can be executed by the printing plate bending apparatus according to the present embodiment. FIG. 2 is a perspective view showing the overall appearance of the printing plate folding apparatus according to the present embodiment. FIG. 11 is a plan view showing the operation switch section 12 of FIG. FIG. 12 is a block diagram showing a control system of the printing plate folding apparatus of FIG.

  First, schematic steps of the printing plate folding method performed by the printing plate folding apparatus according to the present embodiment will be described with reference to FIGS.

  As shown in FIG. 1 (a), a bent base plate 3 preferably made of spring steel is fixed to the pedestal 2 so as to protrude from the tip 2a of the pedestal 2, and is supported by a plastic support. 1 is placed on the base 2 and the folding base plate 3 and positioned so that the edge 1a of the printing plate 1 protrudes from the tip 3a of the folding base plate 3. Next, the plate fixing block 4 and the bending block 5 positioned above as shown by the broken line in the figure are lowered in the downward direction V, and the upper surface of the printing plate 1 is pressed by the plate fixing block 4 and the bending block 5.

  Next, as shown in FIG. 1B, when the bending block 5 is rotated in the rotation direction R as indicated by a broken line in the rotation direction R with the front end portion 3a of the bending base plate 3 as a rotation center, the rotation is rotated approximately 180 °. Then, a folding base plate is sandwiched between the plate fixing block 4 and the folding block 5 so that the printing plate 1 is overfolded at the edge 1a. In this overfolded state, the plate fixing block 4 and the folding block are 5, the printing plate 1 and the folded base plate 3 are pressed for a predetermined holding time.

  Next, the bending block 5 is rotated in the direction opposite to the rotation direction R, returned to the position of FIG. 1A, and again rotated approximately 180 ° in the rotation direction R as shown in FIG. After pressing with the holding time, the bending is repeated a predetermined number of times.

  Next, as shown in FIG. 1C, when the printing plate 1 is taken out after the plate fixing block 4 and the bending block 5 are retracted together in the upward direction V ′, the edge of the printing plate 1 which is folded over is removed. The portion 1a springs back, and the edge portion 1a can be bent at a substantially right angle with respect to the printing plate 1.

  As described above, in the printing plate folding apparatus according to the present embodiment, one side of the sheet-like printing plate material supported by the plastic support is placed on the one side of the plate fixing block and the folding block. The other side is brought into contact with the bent base plate, the bent block is rotated about 180 ° around the front end portion of the bent base plate, By pressing the printing plate material and the folding base plate with the plate fixing block and the folding block while folding and folding the edge portion of the printing plate material so as to sandwich the folding base plate, Bend the edge of the printing plate material.

  According to this printing plate folding apparatus, the printing base material is overlapped and folded at the edge by sandwiching the folding base plate between the plate fixing block and the folding block, and the printing plate and the folding plate are folded in this overlapping state. Since the base plate is pressed, the edge portion of the printing plate material can be accurately folded without heating, no heating means is required, and the folding base plate is retracted when the folding block is rotated. Since it is not necessary, the bending position accuracy can be improved, and the apparatus and mechanism can be simplified.

  Next, the entire printing plate bending apparatus according to the present embodiment will be described. As shown in FIG. 2, the printing plate folding apparatus includes a folding mechanism unit 11 that folds a sheet-like printing plate surrounded by a cover member 11a, sets the number of folding times and a holding time of the printing plate press, and sets a folding start switch. There is provided an operation switch unit 12 and a printing plate setting unit 13 having a flat and inclined surface so that a printing plate can be placed and set.

  The printing plate folding apparatus further comprises a plate pressing lever 14 that is ready to be folded when pulled up and releases the folding mechanism 11 when it is pulled down to set and remove the printing plate, and a control device that houses a power source on the front side. An electrical box 15 in which the switch 20 is disposed, an installation table 16 placed on the installation surface, and a support frame 17 that stands upright from the installation table 16 and is inclined so as to support the printing plate setting unit 13 and the bending mechanism unit 11. Prepare.

  Further, the printing plate setting unit 13 has a built-in suction mechanism for sucking the suction grooves 71 to 82 (FIG. 14) with a negative pressure when the printing plate is placed. The suction mechanism is used for switching the suction size. A switching valve 18, a foot switch 19 for turning on / off the adsorption of the printing plate, and a vacuum pump 64 (see FIG. 12) provided in the electrical box 15 so as to generate and suck a negative pressure to suck the printing plate. 20).

  As shown in FIG. 11, the operation switch unit 12 includes a timer 46 that can set the holding time of the printing plate press, a counter 47 that can set the number of times the printing plate is bent, and a button unit 48a that is a lighting unit 62 (FIG. 12). ) And a push button switch 48 that can be turned on and blinked.

  The timer 46 can set an arbitrary holding time within a range of 1 to 15 seconds, for example, by increasing the time with the plus key 46a and decreasing the time with the minus key 46b in units of seconds. After a lapse, the bending mechanism unit 11 moves to the next operation. Further, the counter 47 can set an arbitrary number of foldings within a range of, for example, 1 to 9 by increasing the number of times with the plus key 47a and decreasing the number of times with the minus key 47b. The operation of the mechanism unit 11 is stopped. The push button switch 48 can start, stop, and return the bending by pressing the button portion 48a.

  As shown in FIG. 12, the control system of the printing plate bending apparatus of FIG. 2 has a control unit 60 composed of a central processing unit (CPU) in the electrical box 15 of FIG. Each signal is input from the foot switch 19, the timer 46, the counter 47, the push button switch 48, and the like. Based on these input signals, the control unit 60 controls the motor 61 and the push button switch 48 which are driving sources for rotationally driving the folding block 25 (FIG. 5) that rotates to bend the printing plate in the folding mechanism unit 11. The lighting unit 62, the buzzer 63 disposed in the vicinity of the operation switch unit 12 in FIG. 2, and the vacuum pump 64 for adsorbing the printing plate in the adsorption groove by the printing plate setting unit 13 in FIG.

  Next, the printing plate setting unit of the printing plate bending apparatus shown in FIG. 2 will be described with reference to FIGS. FIG. 14 is a plan view showing a printing plate setting section of the printing plate bending apparatus of FIG. FIG. 15 is a cross-sectional view of the main part showing the vicinity of the reference pin hole of the printing plate setting part of FIG. FIG. 16 is a cross-sectional view of an essential part of the printing plate set portion taken along line XV-XV in FIG. FIG. 17 is a plan view schematically showing a state in which printing plates of various sizes are positioned and set in the printing plate setting section of FIG.

  As shown in FIG. 2, the printing plate setting unit 13 of the printing plate bending apparatus includes a reference pin mounting plate 55 configured so that the reference pins 58 and 59 can be inserted and removed on the inclined lower side. The notch for positioning formed on the printing plate is engaged with the reference pins 58 and 59 so that the printing plate is positioned and set on the printing plate setting unit 13.

  As shown in FIG. 14, the reference pin mounting plate 55 extends along the lower end 13 b in the width direction W that is the horizontal direction of FIGS. 2 and 14 of the printing plate setting portion 13, and the upper end of the printing plate setting portion 13 at both ends. It has the protrusion parts 53 and 54 extended so that it might protrude to 13a side.

  The reference pin mounting plate 55 is configured in a plate shape so as to be accommodated in a recess formed in the printing plate set portion 13, and as shown in FIG. 14, formed in pairs in the protruding portions 53 and 54 in the longitudinal direction of the figure. A long oblong hole is attached and fixed to the printing plate setting portion 13 by bolts 53a and 54a, and forms the same surface as the surface of the printing plate setting portion 13 as shown in FIG. Thus, since the reference pin mounting plate 55 is an oblong hole and is attached by the bolts 53a and 54a, it can be removed from the printing plate set portion 13 for maintenance and replacement, and the bolts 53a and 54a can be removed. The position in the vertical direction of the figure can be finely adjusted by loosening and a distance adjusting mechanism described later.

  As shown in FIG. 14, a large number of reference pin holes 58 a and 59 a are provided in the protruding portions 53 and 54 on the left and right ends of the reference pin mounting plate 55 corresponding to various printing machine specifications and printing plate sizes, Each reference pin hole 58a, 59a is configured such that the reference pin 58 can be inserted and removed as shown in FIG. When the position and shape of the notch of the printing plate changes, the reference pins 58 and 59 can be adapted to change of the notch position and shape of the printing plate by being inserted into the corresponding reference pin holes 58a and 59a. It is.

  Further, the printing plate setting section 13 is an eccentric cam that moves the reference pin mounting plate 55 with respect to the printing plate setting section 13 in order to adjust the distance between the upper end 13a and the reference pin 58 and the distance between the upper end 13a and the reference pin 59. A distance adjusting mechanism including 56 and 57 is provided. As shown in FIG. 14, circular holes 56a and 57a are formed in the protruding portions 53 and 54 on both the left and right sides of the reference pin mounting plate 55, and the eccentric cams 56 and 57 are rotatably printed in the circular holes 56a and 57a. It is fixed to the plate setting unit 13 side. By rotating the eccentric cams 56 and 57 in the circular holes 56a and 57a with the bolts 53a and 54a loosened, the reference pin mounting plate 55 to which the gravitational component is added due to the inclination is moved on both the left and right sides respectively. The vertical position can be finely adjusted.

  As described above, according to the distance adjustment mechanism including the eccentric cams 56 and 57, the distance from the reference pins 58 and 59 to the bending position of the upper end 13a can be adjusted at both ends by the movement of the reference pin mounting plate 55. Therefore, it is easy to adjust the position during device production.

  Further, when the reference pin mounting plate 55 is mounted so as to be fitted into the concave portion of the printing plate setting portion 13, a groove g is formed between the reference pin mounting plate 55 and the printing plate setting portion 13, as shown in FIG. Since the edge of the printing plate may be caught in the groove g at each end of the reference pin mounting plate 55 facing the upper end 13a, each end 55a, 55b, 55c has a sloped inclined surface. Thereby, when the printing plate is set or removed in the printing plate setting unit 13, the edge of the printing plate is not caught in the groove g, so that the printing plate is not set or removed.

  Further, since the reference pin mounting plate 55 is made of steel, even if the reference pins 58 and 59 are frequently inserted and removed, the reference pin holes 58a and 59a are not easily scraped, and the positional accuracy of the reference pins 58 and 59 is increased. Can be maintained. The reference pins 58 and 59 are made of stainless steel. Further, since the printing plate setting unit 13 is made of aluminum, it is possible to reduce the weight of the apparatus, the number of processing steps, the cost, and the like.

  Next, the suction grooves formed on the surface of the printing plate setting unit 13 in FIG. 14 will be described with further reference to FIGS. FIG. 18 is a view showing piping for suction of the suction grooves arranged on the back surface side of the printing plate setting portion of FIG. FIG. 19 is a cross-sectional view of a principal part taken along line XIX-XIX in FIG. FIG. 20 is a diagram schematically showing the piping path of FIG.

  As shown in FIG. 14, a plurality of suction grooves 71 to 82 for sucking and fixing the printing plate are linearly formed on the surface of the printing plate setting unit 13. That is, the relatively long suction grooves 71 and 72 are formed so as to extend from the upper side in the vertical direction perpendicular to the width direction W to the vicinity of the inside of the protrusions 53 and 54 of the reference pin mounting plate 55, and are also relatively long suction grooves. 73 and 74 are formed so as to be orthogonal to the suction grooves 71 and 72 and extend in the width direction W. Each of the suction grooves 71 to 82 is sucked by the vacuum pump 64 to be a negative pressure.

  Further, suction grooves 77 and 78 having an intermediate length are formed obliquely with respect to the width direction W between the protruding portions 53 and 54 of the reference pin mounting plate 55. Similarly, suction grooves 79 and 80 having an intermediate length are formed obliquely with respect to the width direction W on the outside of the protruding portions 53 and 54.

  Also, relatively short suction grooves 75 and 76 are formed between the suction grooves 71 and 72 obliquely with respect to the width direction W between the upper ends of the suction grooves 71 and 72 in the vertical direction and the upper end 13a. Yes. Similarly, relatively short suction grooves 81 and 82 are located outside the upper ends of the suction grooves 71 and 72 and are formed obliquely with respect to the width direction W.

  As shown in FIG. 17, when the printing plate A having the minimum size is set in the printing plate setting unit 13, the suction grooves 71 to 76 suck the printing plate A having the minimum size, and the other suction grooves 77 to 82 are the minimum. Printing plates B, C, D, and E that are outside the area corresponding to the printing plate A of the size, do not participate in the adsorption of the printing plate A of the smallest size, and are larger than the printing plate A of the smallest size When set in the plate setting unit 13, all the suction grooves 71 to 82 are involved in the suction.

  That is, as shown in FIGS. 18 and 20, a plurality of sockets a to k are arranged on the back side of the printing plate set portion 13 corresponding to the respective suction grooves 71 to 82, and the vacuum pump 64 is connected to the piping. Connected to the sockets f to k and connected to suction grooves 71 to 76 for sucking the printing plate A having the minimum size. The vacuum pump 64 is connected to the sockets f to e and l through the switching valve 18 and the pipes, and is connected to suction grooves 77 to 82 for sucking the printing plates B to E larger than the minimum size.

  For example, as shown in FIG. 19, the socket h is arranged at the intersection of the suction grooves 71 and 74 and fixed to the screwing, and the suction grooves 74 and 71 and the pipes 74 b and 74 c are connected through the through holes 74 a of the printing plate setting unit 13. The suction grooves 74 and 71 are made negative pressure through the piping from the vacuum pump 64 through communication. Also in the other sockets, the suction grooves and the pipes communicate with each other through the same through hole of the printing plate setting unit 13, and each suction groove is made negative pressure through the pipe by the vacuum pump 64.

  The suction grooves 71 to 76 for sucking the printing plate A of the minimum size are always set to a negative pressure when the switching valve 18 is normally turned off and the vacuum pump 64 is turned on, while the printing plates B to E larger than the minimum size are placed. The adsorption grooves 77 to 82 to be adsorbed are made negative pressure by switching the switching valve 18 on.

  When the minimum size printing plate A having positioning notches k1 and k2 formed at the lower end is set in the printing plate setting section 13 of the printing plate bending apparatus as described above, as shown in FIG. After inserting the reference pins 58 and 59 corresponding to the shape of the notches k1 and k2 into the reference pin holes 58a and 59a at the corresponding positions, the printing plate 1 is engaged with the notches k1 and k2 in the reference pins 58 and 59. When the foot switch 19 in FIG. 2 is turned on, the vacuum pump 64 is activated, so that the suction grooves 71 to 76 in the region corresponding to the minimum size printing plate A become negative pressure, and the printing plate By adsorbing A to the printing plate set unit 13, it can be positioned and fixed with high accuracy. At this time, since the switching valve 18 is off, the suction grooves 77 to 82 for sucking the printing plates B to E larger than the minimum size are not under negative pressure. For example, when the printing plate B larger than the minimum size is set, the printing plate B is inserted into the reference pin holes 58a and 59a at the corresponding positions in the same manner, and then the printing plate B is inserted. B is positioned by engaging the notch with the reference pin, the foot switch 19 in FIG. 2 is turned on, the vacuum pump 64 is activated, and the switching valve 18 is turned on, so that all the suction grooves 71 to 82 are negative. The printing plate B can be positioned and fixed with high accuracy by adsorbing the printing plate B to the printing plate setting unit 13. When other printing plates C, D, and E larger than the minimum size are set, they are sucked and fixed in the same manner as the printing plate B.

  In the above-described case, the distance from the reference pins 58 and 59 to the bending position of the upper end 13a is adjusted in advance by the distance adjusting mechanism at the protruding portions 53 and 54 on the left and right ends of the reference pin mounting plate 55. The positioning accuracy of plates A and B is good.

  As described above, according to the present embodiment, the printing plate is fixed to the printing plate setting unit 13 by setting the suction groove provided in the printing plate setting unit 13 to a negative pressure, and the printing plate of the minimum size is obtained. Only the adsorption grooves 71 to 76 that adsorb A are always in the adsorption state, and the adsorption of the printing plate A having the minimum size can be reliably performed without the adsorption loss of the vacuum pump 64. When the printing plates B to E other than the minimum size are fixed, the switching plates 18 are switched so that the suction grooves 77 to 82 in the region outside the minimum size also have negative pressure. In the case of B to E, there is no adsorption loss, adsorption can be performed, and the capacity of the vacuum pump for generating negative pressure can be reduced. Conventionally, the suction area has not been switched in accordance with the size of the printing plate, and suction loss has occurred. In the present embodiment, there is no such suction loss.

  Further, the suction grooves 75, 76, 81, 82 and the suction grooves 77 to 80 in the vicinity of the bending mechanism portion 11 and in the vicinity of the reference pin holes 58a, 59a into which the reference pins 58, 59 are inserted are inclined with respect to the width direction W. By arranging, when the printing plates A to E are set in the printing plate setting unit 13, even if the edges of the printing plate come into contact with the suction grooves 75 to 82 of the printing plate setting unit, they are not caught.

  Further, according to the configuration of the printing plate set portion 13 and the reference pin mounting plate 55 as described above, if the reference pins 58 and 59 are frequently inserted and removed, the reference pin hole may be cut depending on the material of the reference pin mounting plate. Therefore, although the positional accuracy of the reference pin may be deteriorated, the positional accuracy of the reference pin can be maintained by configuring the reference pin mounting plate 55 with steel. In addition, since the reference pin mounting plate 55 is configured separately from the printing plate setting unit 13, it can be manufactured from steel as described above, and the printing plate setting unit 13 is manufactured from aluminum, thereby reducing the weight of the apparatus and processing it. Man-hours and costs can be reduced.

  In addition, since the reference pin mounting plate 55 is detachable from the printing plate setting unit 13, even if the position and shape of the reference pin are changed due to a change in the specifications of the printing machine, etc., printing is simply performed by remaking the reference pin mounting plate 55. The plate folding apparatus can be used as it is.

  Next, a recess for taking out the printing plate provided in the vicinity of the bending mechanism unit 11 of the printing plate setting unit 13 will be described with reference to FIGS.

  As shown in FIGS. 14 and 17, the concave portions 91 and 92 are formed from the surface of the printing plate setting portion 13 in the vicinity of the bending mechanism portion 11 of the printing plate setting portion 13 at two left and right sides in the lateral width direction W of FIG. It is formed so as to be recessed. The recesses 91 and 92 are formed in a horizontally long rectangular shape that is long in the width direction W as a whole.

  The recesses 91 and 92 are provided avoiding the suction grooves, and the recess 91 is located between the suction grooves 73 and 81 in the direction orthogonal to the width direction W as shown in FIG. It is located outside the groove 71. Similarly, the concave portion 92 is located between the suction grooves 73 and 82 in a direction orthogonal to the width direction W, and is located outside the suction groove 72 in the width direction W.

  The concave portion 91 includes an inner groove portion 91b formed in a bottomed groove shape inside the width direction W, an outer groove portion 91c formed in a bottomed groove shape outside the width direction W, an inner groove portion 91b, and an outer groove portion. And a central hole portion 91a penetrating in the plate thickness direction of the printing plate set portion 13 between the printing plate set portion 13 and 91c. Similarly, the concave portion 92 includes an inner groove portion 92b formed into a bottomed groove shape inside the width direction W, an outer groove portion 92c formed into a bottomed groove shape outside the width direction W, and an inner groove portion 92b. And a central hole portion 92a penetrating in the plate thickness direction of the printing plate set portion 13 between the outer groove portion 92c and the outer groove portion 92c.

  The recesses 91 and 92 are configured such that the longitudinal length h in FIG. 14 in the direction orthogonal to the width direction W in the drawing is 30 mm or more. As shown in FIG. 17, when the printing plate E having the maximum size is set in the printing plate setting section 13, the distance m between the side edge of the printing plate E and the outer groove portion 91c (or the outer groove portion 92c) is 15 mm. As described above, the outer positions of the outer groove portion 91c and the outer groove portion 92c are determined. Further, when the printing plate A having the minimum size is set in the printing plate setting unit 13, the distance n between the side edge of the printing plate A and the inner groove portion 91b (or the inner groove portion 92b) is 20 mm or more. The inner positions of the inner groove portion 91b and the inner groove portion 92b are determined.

  When one of the printing plates A to E is set in the printing plate setting unit 13, a part of each of the recesses 91 and 92 is covered with the printing plate, and the other part is exposed on the surface. A space is formed between the lower surface of the printing plate and the recesses 91 and 92, and when the operator takes out the printing plate, the operator can put the finger into the space and lift it out from the exposed portion on the surface.

  Further, as described above, by optimizing the dimensions h, m, and n of the recesses 91 and 92, the operator's finger can surely grasp the printing plate, and the printing plate of each size can be easily taken out. To be able to.

  Next, the bending mechanism portion 11 of the printing plate bending apparatus shown in FIG. 2 will be described with reference to FIGS.

  FIG. 3 is a perspective view of the bending mechanism 11 of the printing plate bending apparatus of FIG. 2 as viewed from the back side with the cover member 11a removed. FIG. 4 is a perspective view of a main part showing a state in which the plate fixing block 24 and the bending block 25 of the bending mechanism unit 11 of FIG. 3 are retracted upward. FIG. 5 is a side view showing a state in which the plate fixing block 24 and the bending block 25 of the bending mechanism unit 11 of FIG. 3 are retracted upward. FIG. 6 is a side view showing a state in which the plate fixing block 24 and the bending block 25 of the bending mechanism unit 11 of FIG. 3 are lowered and press the printing plate.

  As shown in FIGS. 3 to 6, the bending mechanism unit 11 is a plate fixing block 24 that fixes the sheet-like printing plate 1 (FIG. 5) placed on the printing plate setting unit 13 of FIG. 2 when bending. A bending block 25 that rotates approximately 180 ° around the rotation shaft 32 so that the printing plate 1 fixed by the plate fixing block 24 is folded at the edge 1a, a gear 31 connected to the rotation shaft 32, and a plate fixing And a support portion 21 that supports the block 24 and the bending block 25 and rotatably supports the rotating shaft 32.

  As shown in FIGS. 5 and 6, when the plate pressing lever 14 is pulled up in the rotation direction S, the lever moves at a fulcrum 14 a provided below the printing plate setting portion 13, and moves to the action portion 21 e below the support portion 21. When the force acts, the support portion 21 is guided by rollers 21b in the groove 21a of the support portion 21 and rollers 21c and 21d in contact with the side surface of the support portion 21 on the plate pressing lever 14 side. When the plate holding lever 14 is pulled down in the rotation direction S ′, the support portion 21 moves together with the plate fixing block 24 and the bending block 25 substantially upward r ′ in the figure. It is supposed to be.

  As shown in FIG. 5, when the plate holding lever 14 is pulled up in the rotation direction S and the support portion 21 is lowered substantially downward r in the figure, the plate fixing block 24 and the folding block 25 are printed as shown in FIGS. It approaches the plate setting unit 13 side, contacts and presses the printing plate 1 on the printing plate setting unit 13, and the gear 31 connected to the rotary shaft 32 also descends, so that the gear 31 is below the printing plate setting unit 13. It meshes with another arranged gear 33.

  Further, as shown in FIG. 6, when the plate holding lever 14 is pulled down in the rotation direction S ′ from the state in which the plate fixing block 24 and the bending block 25 are in contact with and pressed against the printing plate 1 on the printing plate setting unit 13. 4 and 5, the plate fixing block 24 and the bending block 25 are moved away from the printing plate setting unit 13 and moved upward, so that the printing plate can be set or removed.

  Further, when the gear 33 arranged below the printing plate setting unit 13 is rotationally driven via a rotation shaft 33a driven by a motor 61 (FIG. 12) controlled by the control unit 60 of FIG. 3, the bending block 25 is rotated approximately 180 ° in the rotation direction R via the meshing gear 31 and the rotating shaft 32 as shown in FIG. 6, and the 180 ° rotated state is maintained and the plate fixing block 24 is held. The sandwiched printing plate 1 is pressed.

  Further, the plate fixing block 24 and the bending block 25 extend along the width direction W of the printing plate setting unit 13 in FIG. 2, and a gear 31 and a rotation shaft 32 are provided at both ends thereof, and a rotation shaft 33a is also provided. Extending along the width direction W, gears 33 are connected to both ends.

  Moreover, the printing plate set part 13 of FIG. 2 is comprised by the substantially rectangular planar shape as a whole from metal materials, such as aluminum, and as shown in FIGS. 4-6 on the front end side (back side of FIG. 2), A folding base plate 23 made of spring steel extends along the width direction W, and the printing plate set portion 13 and the folding base plate 23 are fixed so as to form the same plane. The folding base plate 23 is fixed by a magnet embedded on the printing plate setting unit 13 side as shown in FIG. 1, so that no projection is generated on the plane of the printing plate setting unit 13.

  Further, as shown in FIGS. 4 to 6, the leading end portion 23 a of the bent base plate 23 fixed to the printing plate setting portion 13 protrudes from the end portion 13 a of the printing plate setting portion 13, and the bending block 25 is The positional relationship protrudes so as not to contact the distal end portion 23a. The bending block 25 rotates about the rotation shaft 32. The central axis of the rotation shaft 32 is substantially coincident with the distal end portion 23a of the folding base plate 23, and the bending block 25 has the distal end portion 23a. It rotates in the rotation direction R as a substantial rotation center.

  The bent base plate 23 made of a metal plate preferably has a thickness in the range of 0.3 to 0.7 mm. If the thickness of the folding base plate 23 is less than 0.3 mm, the folding base plate 23 is bent with the rotation of the folding block 25, which is not preferable. If the thickness exceeds 0.7 mm, the printing plate 1 is bent. It is not preferable because it follows the tip 23a of the base plate 23 and tends to be bent in two steps. The thickness of the bent base plate 23 is more preferably in the range of 0.4 to 0.5 mm. Further, the material of the bent base plate 23 is spring steel, and when the bending block 25 rotates about the tip end portion 23a of the bent base plate 23 as a rotation center, the spring steel is bent, The concentrated load on the bent portion of the printing plate 1 can be absorbed, and cracking of the printing plate 1 can be prevented.

  The lower portion of the folding block 25 is configured as a thin portion 25a having a small thickness in the longitudinal direction (depth direction) of the printing plate set portion 13 shown in FIGS. 2, 5, and 6, and the thickness of the thin portion 25a is folded. The protruding length of the tip 23a of the base plate 23 is smaller than the protruding length. As a result, when the folding block 25 rotates approximately 180 °, the folding block 25 does not come into contact with the end portion 13a of the printing plate setting portion 13, and the thin wall portion 25a is the lower surface of the distal end portion 23a of the folding base plate 23. (See FIG. 9F).

  Next, a pressing force adjusting mechanism that adjusts the pressing force when the printing plate 1 is pressed between the thin portion 25a and the plate fixing block 24 after the bending block 25 is rotated approximately 180 ° in the rotation direction R is illustrated. This will be described with reference to FIG. FIG. 7 is a rear view (a) and a partially enlarged view (b) of the plate fixing block 24 provided with the pressing force adjusting mechanism as seen from the rear side shown in FIGS.

  As shown in FIG. 7A, the plate fixing block 24 extends in the width direction W of the printing plate setting unit 13 in FIG. 2, but is divided into an upper block 24a and a lower block 24b. In the pressing force adjusting mechanism shown in FIG. 7, the upper block 24a and the lower block 24b are screwed together by screw holes 24c provided at a plurality of positions in the width direction W, and are screwed at a plurality of positions in the width direction W to the lower block 24b. It is configured by providing a hole 24d.

  As shown in FIGS. 7A and 7B, the bolts 24f are inserted from the through holes formed in the upper block 24a and screwed into the screw holes 24c of the lower block 24b, whereby the blocks 24a and 24b are screwed together. . Further, the set screw 24g is screwed into each screw hole 24d from the lower surface of the lower block 24b, and the protruding amount from the mating surface 24e of both the blocks 24a and 24b is adjusted for each set screw 24g, whereby the entire plate fixing block 24 is The height h is adjusted in the width direction W. Thus, since the overall height h of the plate fixing block 24 changes in the width direction W, the pressing force when pressing the printing plate 1 between the plate fixing block 24 and the thin portion 25a of the bending block 25 changes. The pressing force can be adjusted.

  Next, a fall prevention mechanism for holding and fixing the bending mechanism portion 11 moved upward as shown in FIG. 5 at the upper holding position will be described with reference to FIG. FIG. 8 is a schematic diagram (a) and a partially enlarged view (b) showing a fall prevention mechanism of the bending mechanism section 11.

  As shown in FIG. 8A, the magnet 40 is fixed below the support portion 21 of the bending mechanism section 11, and when the bending mechanism section 11 moves substantially upward r as shown in FIGS. The magnet 40 is attracted to a fixed portion 41 fixed to the printing plate setting portion 13 side. By this fall prevention mechanism, when the bending mechanism portion 11 is retracted upward, it is held and fixed at the holding position, and both hands can be used for setting the printing plate 1, thereby improving workability and preventing damage to the printing plate 1. It becomes possible and can secure safety during work.

  Further, as shown in FIGS. 8A and 8B, the fixed portion 41 is provided with a ball plunger 41a, and a spring in the ball plunger 41a is positioned at a position where the magnet 40 is attracted to the fixed portion 41. The small ball 41 b urged outward by 41 c enters the hemispherical recess 21 f on the side surface of the support portion 21. By this ball plunger 41a, the bending mechanism 11 is moved upward as shown in FIG. 5, and the positioning when the magnet 40 is attracted to the fixing part 41 and fixed at the holding position is reliably performed.

  Next, the bending process of bending the edge portion of the printing plate having the plastic support by the printing plate bending apparatus shown in FIGS. 2 to 8 and 11 to 20 will be described with reference to FIGS. 9 (a) to 9 (f) and FIG. This will be described with reference to a flowchart. FIGS. 9A to 9F are main part side views for explaining folding steps (a) to (f) in which the edge portion of the printing plate is folded by the printing plate folding apparatus of FIGS. 2 to 8. . FIG. 13 is a flowchart for explaining the folding operation of the printing plate folding apparatus of FIGS. 2 to 9, 11 and 12.

  First, with the operation switch unit 12 of FIG. 11, the holding time of pressing in the timer 46 is set to 5 seconds, for example, and the number of times of bending is set to 2 in the counter 47 (S01). Next, when the plate pressing lever 14 is pulled down in the rotation direction S ′, the bending mechanism portion 11 such as the plate fixing block 24 and the bending block 25 moves substantially upward r ′, as shown in FIGS. 5 and 9A. At this time, the bending mechanism unit 11 is fixed at the position shown in FIG. 9A by the fall prevention mechanism shown in FIG. 8 (S02).

  Next, the sheet-like printing plate 1 is printed so that the front end of the edge 1a protrudes from the front end 23a of the bent base plate 23 as shown by the broken line in FIG. 5 and as shown by the broken line in FIG. The notches k1 and k2 of the plate 1 are engaged with the reference pins 58 and 59 to be positioned and set in the printing plate setting unit 13 (S03).

  Next, by operating the foot switch 19 in FIG. 2, the vacuum pump 64 (FIGS. 12 and 20) of the suction mechanism is operated to adsorb and fix the printing plate 1 to the printing plate setting unit 13 (S04). At this time, when the printing plate 1 is, for example, the printing plate A having the minimum size in FIG. 17, the suction grooves 71 to 76 in the region corresponding to the printing plate A having the minimum size have a negative pressure to suck the printing plate A. Since the switching grooves 18 are off and the suction grooves 77 to 82 for sucking the printing plates B to E larger than the minimum size do not become negative pressure, there is no suction loss.

  Next, when the plate pressing lever 14 is pulled up in the rotation direction S from the state of FIG. 5, the fixing by the magnet 40 of FIG. 8 is released, and the bending mechanism portion 11 moves substantially downward r to move the plate fixing block 24 and the bending block. As shown in FIGS. 6 and 9B, the plate fixing block 24 comes into contact with the printing plate 1, and the thin portion 25 a of the bending block 25 comes into contact with the protruding edge portion 1 a of the printing plate 1. In this way, the bending mechanism 11 is set by the plate pressing lever 14 (S05).

  Next, when the push button switch 48 of FIG. 11 is pressed and turned on, the motor 61 (FIG. 12) rotates to start the bending operation (S06). That is, the rotation block 32 is rotated in the rotation direction R by rotating the rotation shaft 32 through the rotation shaft 33a, the gear 33, and the gear 31 as shown in FIGS. Rotation is started with the tip 23a of the tube as a substantial center of rotation, rotating 45 ° as shown in FIG. 9 (c), 90 ° as shown in FIG. 9 (d), and 135 ° as shown in FIG. The portion 25a bends the edge 1a of the printing plate 1.

  Then, when the bending block 25 is rotated by 180 ° as shown in FIG. 9 (f), the folding block 25 is positioned downward so as to face the plate fixing block 24, and the end of the printing plate 1 is located between the thin portion 25 a and the plate fixing block 24. The edge portion 1a is folded in a state of being sandwiched with the leading end portion 23a of the folding base plate 23 (see FIG. 1B) (S07).

  And the edge part 1a of the printing plate 1 folded by the thin part 25a is pressed by hold | maintaining the folding state of the printing plate 1 of FIG.9 (f) (S08). This pressing is continued for the holding time set by the timer 46 (S09), and when the number of bendings is less than the number set by the counter 47 (S10), the motor 61 (FIG. 12) is rotated backward (S11), After the bending block 25 is returned from the state of FIG. 9 (f) to the state of FIG. 6 and FIG. 9 (b), the bending step and the pressing step are performed again in the same manner as in the above steps S07 and S08.

  Next, when the number of times of bending reaches the number set by the counter 47 (S10), the bending operation ends (S12), the vacuum pump 64 automatically stops and the suction mechanism stops (S13). The button part 48a is turned on by the lighting part 62 (FIG. 12) and the buzzer 63 (FIG. 12) is formed (S14). In addition, the button part 48a blinks by the lighting part 62 (FIG. 12) from the bending operation start S06 to the bending operation end S12. Thereby, it can be seen that the printing plate folding apparatus of FIG. 2 is in a folding operation.

  Next, when the plate holding lever 14 is pulled down in the rotation direction S ′, the bending mechanism portion 11 is moved upward and released as shown in FIGS. 5 and 9A and fixed by the magnet 40 in FIG. Then, the printing plate 1 is removed from the printing plate setting unit 13 (S16). When the end edge portion 1a folded over the printing plate 1 is spring-backed, the edge portion 1a can be bent substantially at right angles to the printing plate 1 as shown in FIG. When the printing plate 1 is removed from the printing plate setting unit 13, the operator can enter a space formed between the concave portions 91 and 92 on the left and right sides of the printing plate setting unit 13 and the lower surface of the printing plate 1. It can be easily removed by putting a finger up and lifting it up. Even if the vacuum pump 64 automatically stops and the suction mechanism stops in step S13, the vacuum state may be maintained and the printing plate 1 may be in the suction state. Even in such a case, the edge 1a is bent. The printed printing plate 1 can be easily taken out by hand.

  As described above, according to the printing plate bending apparatus of the present embodiment, since the concave portions 91 and 92 that are recessed from the surface are provided in the printing plate setting section 13, the printing plate 1 set in the printing plate setting section 13 is provided. A space is formed between the lower surface and the recesses 91 and 92, and an operator can put out a finger and lift the printing plate 1 easily from this space. Further, since the concave portions 91 and 92 are in the vicinity of the bending mechanism portion 11, even if the printing plate 1 is supported by a plastic support and the rigidity is low or the curl is generated, the edge portion 1a of the printing plate 1 is The bent portion can be reliably taken out without being caught by the end portion 13a of the printing plate setting portion 13.

  Moreover, the intensity | strength of a printing plate setting part can be maintained by not forming the recessed parts 91 and 92 provided in the surface of the printing plate setting part 13 continuously, but making it right-and-left independent. If it is formed continuously, the strength of the printing plate set portion is lowered, and there is a risk that bending and twisting may occur and the accuracy of the bending position may be lowered, but there is no problem of such strength reduction and position accuracy reduction.

  Further, the folding base plate 23 is sandwiched between the plate fixing block 24 and the folding block 25 so that the printing plate 1 is overfolded at the edge portion 1a, and the printing plate 1 and the folding base are folded in this overfolded state. Since the plate 23 is pressed for a predetermined pressing time and the bending operation is repeated a predetermined number of times, the edge 1a of the printing plate 1 can be accurately folded without heating, and the bending angle of the edge 1a can be set. The folding base plate 23, which is a member inside the folding of the printing plate, does not need to be retracted when the folding block 25 is rotated and can be folded at a right angle with high accuracy. The position accuracy can be improved, and the device / mechanism can be simplified.

  In addition, as shown in FIG. 17, the printing plate 1 can be positioned and set with high accuracy on the printing plate setting unit 13 by positioning the printing plate 1 by engaging the notches k1 and k2 with the reference pins 58 and 59. . Further, since the distance from the reference pins 58 and 59 to the bending position of the upper end 13a is adjusted in advance by the distance adjusting mechanism, the positioning accuracy of the printing plate 1 is good.

  Further, the bending angle can be adjusted by changing the pressing force by the pressing force adjusting mechanism shown in FIG. 7, and the pressing force can be adjusted at an arbitrary position in the width direction W of the printing plate 1. Can eliminate undulations.

  In addition, since the printing plate 1 is always in contact with the upper surface of the bent base plate 23, if there is a protrusion, scratches on the printing plate and catching of the printing plate edge portion during setting occur. By holding and fixing the bent base plate 23 with a magnet, there are no protrusions, and it is possible to prevent such scratches from occurring. In addition, it is not preferable to hold and fix the bent base plate 23 with an adhesive, a double-sided tape or the like because workability during assembly deteriorates.

  In addition, since no heating means is required, a heating control mechanism or the like is unnecessary, which does not increase the number of parts or increase the cost, and does not require a standby state in which the temperature is raised to a constant temperature. There is no power consumption and no energy is wasted, and the image forming layer does not react with heat on the printing plate.

  Further, by changing at least one of the holding time when the printing plate 1 is pressed by the bending mechanism unit 11 and the number of times of folding by the folding mechanism unit 11, the bending angle is adjusted by applying heat to the printing plate as in the past. Even without this, the bending angle at the edge 1a of the printing plate 1 can be adjusted. Further, since the driving source (motor 61) of the bending block 25 of the bending mechanism unit 11 is provided, the printing plate can be automatically bent and released.

  Further, as shown in FIGS. 11 and 12, by providing the timer 46 and the counter 47, the bending time (press holding time) and the number of times of bending can be accurately controlled, and a stable bending angle can be reproduced.

  In addition, the notification means constituted by the lighting unit 62 and the buzzer 63 for notifying the completion of the bending enables the user to immediately recognize the completion of the bending operation. Furthermore, by using the lighting unit 62 and the buzzer 63 together, It is possible to recognize the state of the device even in a printing work site where the noise level is high.

  Next, a preferred printing plate applied to the printing plate bending method of FIG. 1 and the printing plate bending apparatus of FIGS. 2 to 9 and FIGS. 11 to 13 will be described with reference to FIG. FIG. 10 is a cross-sectional view schematically showing the layer structure of the printing plate in the present embodiment.

  As shown in FIG. 10, the sheet-like printing plate 1 has at least a hydrophilic layer 51 and a heat-sensitive image forming layer 52 on a plastic support 50. The printing plate 1 is wound around, for example, a drum of a printing plate manufacturing apparatus, and after the drum is rotated and image data is scanned and exposed by a light source to record an image, the edge 1a is formed as described above. After being bent as in 1 (c), it is effectively mounted on the plate cylinder of the printing press using the bent portion.

  Examples of the plastic support 50 of the printing plate 1 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, etc. 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 there is a problem in transportability. If it is too thin, there is a problem that it is not strong 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 and ease of handling. 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 1 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. Organic hydrophilic matrix structures obtained, inorganic hydrophilic matrix structures obtained by sol-gel conversion consisting of hydrolysis and condensation reactions of polyalkoxysilane, titanate, zirconate or aluminate, metal oxides and the like are preferably used. . 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 1 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.

  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, a pressing force adjusting mechanism similar to that shown in FIG.

  Further, in FIG. 13, both the pressing of the printing plate 1 and a plurality of times of bending are performed by the bending mechanism unit 11, but the printing plate 1 can be formed by performing either one of the pressing of the printing plate 1 and a plurality of times of bending. The end edge portion 1a may be bent.

  Moreover, it is preferable that the holding time and the number of bendings of the printing plate 1 in FIG. 13 are appropriately changed to appropriate holding times and times when the thickness and material of the plastic support 50 are changed.

  Further, in the present embodiment, the suction groove has been described as the suction portion that sucks the printing plate material. However, it is a matter of course that a plurality of suction holes having relatively small diameters may be arranged, and the region corresponding to the minimum size. The printing plate of the minimum size is sucked by the suction holes inside, and when the printing plate is larger than the minimum size, the suction holes outside the region can be sucked with a negative pressure.

  In the present embodiment, the suction groove in the printing plate setting unit is divided into two areas corresponding to the printing plate of the minimum size and the printing plate of a larger size. For example, the size may be divided into three stages corresponding to a minimum size, an intermediate size, and a size larger than the intermediate size.

  14 and 17, the recesses 91 and 92 provided in the printing plate setting unit 13 are in a mixed form of grooves and holes. It may be configured.

It is a sectional side view for demonstrating schematically the bending process (a)-(c) of the preferable printing plate by this invention. It is a perspective view which shows the whole external appearance of the printing plate bending apparatus by this Embodiment. It is the perspective view which looked at the bending mechanism part 11 of the printing plate bending apparatus of FIG. 2 from the back side in the state which removed the cover member 11a. It is a principal part perspective view which shows the state which the plate fixing block 24 and the bending block 25 of the bending mechanism part 11 of FIG. 3 retracted upwards. FIG. 4 is a side view showing a state in which a plate fixing block 24 and a bending block 25 of the bending mechanism section 11 of FIG. 3 are retracted upward. It is a side view which shows the state which the plate fixing block 24 and the bending block 25 of the bending mechanism part 11 of FIG. FIG. 5 is a rear view (a) and a partially enlarged view (b) of the plate fixing block 24 provided with a pressing force adjusting mechanism as seen from the rear side shown in FIGS. It is the schematic diagram (a) which shows the fall prevention mechanism of the bending mechanism part 11, and its partial enlarged view (b). It is a principal part side view for demonstrating the bending process (a) thru | or (f) which bends the edge part of a printing plate with the printing plate bending apparatus of FIG. 2 thru | or FIG. It is sectional drawing which shows typically the layer structure of the printing plate in this Embodiment. It is a top view which shows the operation switch part 12 of FIG. It is a block diagram which shows the control system of the printing plate bending apparatus of FIG. FIG. 13 is a flowchart for explaining a folding operation of the printing plate folding apparatus of FIGS. 2 to 9, 11, and 12. FIG. It is a top view which shows the printing plate setting part of the printing plate bending apparatus of FIG. It is principal part sectional drawing which shows the vicinity of the reference | standard pin hole of the printing plate set part of FIG. It is principal part sectional drawing which fractured | ruptured the printing plate set part along the XV-XV line | wire of FIG. It is a top view which shows roughly the state which positioned and set the printing plate of each size in the printing plate setting part of FIG. FIG. 18 is a view showing piping for suction of the suction grooves arranged on the back surface side of the printing plate setting portion of FIG. It is principal part sectional drawing cut | disconnected in the XIX-XIX line direction of FIG. It is a figure which shows typically the piping path | route of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Printing plate 1a Edge edge part 11 Bending mechanism part 11a Cover member 12 Operation switch part 13 Printing plate setting part 13a Upper end, edge part 50 Plastic support body 51 Hydrophilic layer 52 Thermosensitive image forming layer 58, 59 Reference | standard pin 91 Recessed part 91a Central hole portion 91b Inner groove portion 91c Outer groove portion 92 Recess portion 92a Central hole portion 92b Inner groove portion 92c Outer groove portion A Minimum size printing plate E Maximum size printing plate W Width direction h Vertical length m Distance n Distance

Claims (10)

A printing plate set portion capable of setting a sheet-like printing plate material supported by a plastic support, and a bending mechanism portion for bending an edge portion of the set printing plate material,
The printing plate bending apparatus, wherein the printing plate setting section has a recess that is recessed from the surface and can handle the printing plate material in the vicinity of the bending mechanism.   The printing plate bending apparatus according to claim 1, wherein the recess is formed in a groove shape or a hole shape.   The said recessed part is independently provided in two places so that a part of said recessed part may be exposed to the surface from the right-and-left end of the printing plate material set to the said printing plate setting part. The printing plate bending apparatus according to 2.   4. The printing plate bending apparatus according to claim 1, wherein a dimension of the concave portion in a longitudinal direction orthogonal to a left-right width direction of a printing plate material set in the printing plate setting portion is at least 30 mm. .   Any of 1 to 4, wherein when the printing plate material of the maximum size is set in the printing plate setting section, the concave portion is expanded at least 15 mm outward in the width direction from the left and right ends of the printing plate material. A printing plate bending apparatus according to claim 1.   When the printing plate material of the minimum size is set in the printing plate setting portion, the recesses are expanded at least 20 mm or more inward in the width direction from the left and right ends of the printing plate material. The printing plate bending apparatus of any one of Claims. 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 folding apparatus according to any one of claims 1 to 6, wherein the printing plate material has at least a hydrophilic layer and a heat-sensitive image forming layer on the plastic support. The printing plate bending apparatus according to claim 1, wherein the plastic support is made of polyethylene terephthalate. The printing plate bending apparatus according to any one of claims 1 to 8, wherein the plastic support has a thickness in a range of 170 to 180 µm. 10. The printing plate bending apparatus according to claim 1, wherein a Young's modulus of the plastic support is in a range of 5000 to 6000 N / mm ² .

Images