WO2009104464A1

WO2009104464A1 - Plate exchanging apparatus, plate exchanging method and printing press

Info

Publication number: WO2009104464A1
Application number: PCT/JP2009/051437
Authority: WO
Inventors: 泰伸原田
Original assignee: 三菱重工業株式会社
Priority date: 2008-02-20
Filing date: 2009-01-29
Publication date: 2009-08-27
Also published as: JP2009196168A

Abstract

A tension spring (84) is provided between a suction pad (81) and a supporting member (71) in order to impart resistance against movement of the suction pad sucked by a printing block (P) to the side of a plate cylinder (22a) when the plate cylinder rotates in a mode for winding the printing block where the suction pad (81) for holding the printing block (P) is supported by the supporting member (71) movably to the side of the plate cylinder (22a) and a hook portion (Pf) at the end on the holding side of the printing block held by the suction pad is latched to the gap portion (29a) of the plate cylinder. Since the suction pad pulls the printing block between the suction pad and the gap portion and applies tension to the printing block, the printing block can be applied along the outer circumferential surface of the plate cylinder without causing any crease or breakage. Consequently, the printing block can be wound properly on the plate cylinder.

Description

Plate changing apparatus, plate changing method and printing machine

The present invention relates to a plate changing apparatus, a plate changing method, and a printing machine for automatically changing a printing plate wound around a plate cylinder of an offset printing machine.

Generally, an offset rotary printing press includes a paper feeding device, an infeed device, a printing device, a drying device, a cooling device, a web pass device, a folding device, and a paper discharge device. The paper feeding device has a reel stand on which two winding bodies (web rolls) are mounted, and a web that is drawn out of one winding body and traveling is used as the web of the other winding body. By connecting, the web can be continuously supplied. The in-feed device supplies a web drawn from a winding body of a paper feeding device to a printing device at a predetermined speed. In the printing apparatus, generally, four sets of printing units corresponding to four colors of black, cyan, magenta, and yellow are arranged in parallel along the web traveling direction. The drying device is for drying ink on the web printed by the printing device, and the cooling device is for cooling the web that stores excess heat after drying in the drying device to an appropriate temperature. It is. The web pass device conveys a dried and cooled web. The folding device cuts a vertically folded web and folds it to a predetermined size to form a folded book. The paper discharge device is for carrying out the folded folded book out of the apparatus.

Therefore, a roll-shaped web is drawn from the winding body by the paper feeding device, and this web is supplied to the printing device at a predetermined speed by the infeed device, and multicolor printing is performed by each printing unit in the printing device. The printed web is dried with an ink by a drying device, cooled with a cooling device, a signature is created by a folding device conveyed through a web pass device, and is carried out by a paper discharge device.

When the above-described printing operation is completed on such an offset rotary printing press, the printing plate (old plate) that has been wound around the plate cylinder is removed, and the next new printing plate (new plate) is wound around the plate cylinder. To do. Conventionally, such plate replacement work has been performed manually by an operator, but in recent years, various plate replacement apparatuses that automatically replace the plate have been proposed. In particular, when the new plate is automatically wound around the plate cylinder, it is important to accurately position the holding side end of the printing plate with respect to the plate cylinder holding device. The winding of the printing plate on the plate cylinder will fail.

Conventionally, for example, in Patent Document 1, a printing plate is held at a position where an end portion on the holding side of the printing plate is inserted into a gap of the printing drum, and until the printing plate is fed to the printing drum side while being wound around the printing drum. A plate changing device (plate changing device for a rotary printing press) having a holding device for holding a printing plate is shown. This holding device adsorbs the printing plate by a vacuum device.

Conventionally, for example, Patent Document 2 discloses a plate holder for holding a printing plate as a plate changer (a plate insertion device in a rotary printing press) that positions a holding side end of a printing plate to a holding device of a plate cylinder. And a moving means for moving the plate holder to the plate insertion position. By positioning the plate holder at the plate insertion position by the moving means, the holding side end of the printing plate is attached to the reference pin of the holding device provided in the plate cylinder. What is pressed is shown. In this conventional plate changer, a suction pad can be applied as a plate holder, and the suction force by the suction pump is adjusted to such an extent that the printing plate is sucked so as to be slidable with respect to the suction pad. Then, by positioning the suction pad at the plate insertion position by the moving means, the notch at the holding side end of the printing plate is pressed to the reference pin side, and the printing plate is placed on the side opposite to the reference pin against the suction force of the suction pad. By moving, the holding side end portion of the printing plate is positioned with respect to the holding device. Furthermore, after the holding side end portion of the printing plate is positioned with respect to the holding device, the plate cylinder is rotated by holding the holding side end portion of the printing plate with the holding device so that the printing plate is placed on the outer peripheral surface of the plate cylinder. Wound around. Further thereafter, the holding edge side end portion of the printing plate is held by the holding device.

Further, Patent Document 2 also shows a structure in which a suction pad as a plate holder is movably supported, and the suction pad is biased toward a reference pin by a spring. Then, by positioning the suction pad at the plate insertion position by the moving means, the notch at the end of the plate side is pressed against the reference pin side, and the plate moves against the reference pin against the biasing force of the spring. Thus, the holding side end of the printing plate is positioned with respect to the holding device.

Japanese Patent No. 3810453 JP 2001-80044 A

The plate changing apparatus shown in Patent Document 1 described above holds a printing plate by a holding device that sucks the printing plate until it is fed to the plate cylinder side. For this reason, during the feeding movement of the printing plate, the holding device slips in the suction. In this way, when the suction slips, the suction part of the holding device comes off from the printing plate and comes into contact with the printing plate again. However, in this case, if the suction part is not sufficiently in contact with the printing plate, The vacuum pressure does not act and the printing plate remains detached from the adsorbing portion, and the printing plate may fall off. Here, it is known that a lubricant is applied between the printing plate and the adsorbing portion and actively slides between them. There is a problem such as hanging.

Further, in the plate exchanging device shown in Patent Document 2 described above, the suction of the printing plate by the suction pad is released in a state where the holding side end portion of the printing plate is held by the holding device. Then, the plate cylinder is rotated from this state, and the printing plate is wound around the outer peripheral surface of the plate cylinder. However, when the plate cylinder starts to rotate, the printing plate is held only by the holding device, so that the printing plate flutters with the rotation of the printing cylinder, and the printing plate does not move against the outer peripheral surface of the printing drum. There is a possibility that it cannot be adhered. In such a case, wrinkles or creases occur in the printing plate, and the position of the end of the holding plate side of the printing plate is shifted and cannot be held by the holding device, so that the winding of the printing plate on the plate cylinder fails. In addition, since a printing plate that has failed to be wound cannot be used, it is necessary to make the printing plate again and wind it around the plate cylinder again, which takes a long time to perform printing. Become.

The present invention solves the above-described problems, and an object of the present invention is to provide a plate exchange device, a plate exchange method, and a printing machine that can appropriately wind a printing plate around a plate cylinder.

In order to achieve the above-mentioned object, in the plate changer of the present invention, in the plate changer that winds the printing plate around the outer peripheral surface of the plate cylinder, the holding means for holding the printing plate, and the holding means are the plate. A support member that is movably supported to the cylinder side, and a holding side end portion of the printing plate held by the holding means is locked to an outer peripheral surface of the plate cylinder, and the printing plate is wound around the printing plate. And a resistance applying unit that applies resistance to the movement of the holding unit that is pulled toward the plate cylinder by the printing plate when the plate cylinder rotates.

According to this plate changing apparatus, when the plate cylinder is rotated in such a manner that the holding side end portion of the printing plate held by the holding means is locked to the plate cylinder and the printing plate is wound, the plate cylinder is moved by the printing plate. Since the holding means attracts the printing plate with the plate cylinder and applies tension to the printing plate by giving resistance to the movement of the holding means pulled to the side, the printing plate is wrinkled or bent. The printing plate can be caused to follow the outer peripheral surface of the plate cylinder. As a result, the printing plate can be properly wound around the plate cylinder, so that the failure of winding can be reduced, and the situation where the printing plate is remade and the winding operation is performed again on the plate cylinder can be reduced. In addition, the holding means for holding the printing plate is pulled toward the plate cylinder side as the plate cylinder rotates, but the holding means is provided so as to be movable toward the plate cylinder side, so it moves to the plate cylinder side together with the printing plate. Therefore, no slippage occurs between the holding means and the printing plate when the printing plate is wound, and the situation where the printing plate is detached from the holding means can be remarkably suppressed.

Further, in the plate exchanging apparatus of the present invention, the resistance force of the resistance applying means is made smaller than the holding force for holding the printing plate by the holding means.

According to this plate exchange apparatus, the resistance force of the resistance applying means is made smaller than the holding force for holding the printing plate by the holding means, thereby suppressing the situation where the printing plate is detached from the holding means due to the application of the resistance force. In addition, tension can be applied to the printing plate.

Further, in the plate changer according to the present invention, the plate cylinder is configured in such a manner that the holding side end portion of the printing plate held by the holding means is locked to the outer peripheral surface of the plate cylinder and the printing plate is wound thereon. And a control unit for stopping the rotation of the plate cylinder based on a detection result by the separation detecting means when the printing plate is rotated. Features.

According to this plate exchange apparatus, when the plate cylinder rotates in a manner to wind the printing plate, the separation of the printing plate from the holding means is detected, and the rotation of the plate cylinder is stopped based on the detection result. Therefore, it is not possible to apply tension to the printing plate because the printing plate is detached from the holding means, and it is possible to prevent a winding failure that causes wrinkles or creases in the printing plate, and to reduce the situation of remaking the printing plate.

Further, in the plate exchanging device of the present invention, another resistance applying means for sandwiching the printing plate with the support member is provided in a mode in which a resistance force is applied to the movement of the printing plate wound around the plate cylinder. It is further provided with a feature.

According to this plate exchanging apparatus, the printing plate is further provided with other resistance applying means for holding the printing plate between the support member side and applying resistance to the movement of the printing plate wound around the plate cylinder. The plate can be attached to the outer peripheral surface of the plate cylinder without wrinkles or creases in the plate.

In order to achieve the above-mentioned object, in the plate replacement method of the present invention, in the plate replacement method in which the printing plate is wound around the outer peripheral surface of the plate cylinder, the end portion on the holding side of the printing plate is on the outer peripheral surface of the plate cylinder. When the plate cylinder rotates in a manner of being locked and winding the printing plate, and the holding means for holding the printing plate is pulled by the printing plate and moves to the plate cylinder side, the holding means moves. It includes a step of imparting a resistance force.

According to this plate exchanging method, the plate cylinder rotates in such a manner that the holding side end of the printing plate is locked to the outer peripheral surface of the printing drum and the printing plate is wound, and the holding means for holding the printing plate is the printing plate. When the plate is pulled and moved to the plate cylinder side, the printing plate is attached to the outer peripheral surface of the plate cylinder without causing wrinkles or creases in the printing plate by including a step of imparting resistance to the movement of the holding means. be able to. As a result, the printing plate can be properly wound around the plate cylinder, so that the failure of winding can be reduced, and the situation where the printing plate is remade and the winding operation is performed again on the plate cylinder can be reduced.

Further, the plate replacement method of the present invention is characterized in that it further includes a step of stopping the rotation of the plate cylinder when the printing plate is detached from the holding means.

According to this plate exchanging method, when the printing plate is detached from the holding means, further including a step of stopping the rotation of the plate cylinder, the printing plate is detached from the holding means and tension cannot be applied to the printing plate. It is possible to prevent unsuccessful winding that causes wrinkles or creases in the printing plate, and reduce the situation of remaking the printing plate.

Further, in the plate replacement method of the present invention, when the plate cylinder is rotated in such a manner that the holding side end portion of the printing plate is locked to the outer peripheral surface of the plate cylinder and the printing plate is wound, the printing plate The method further includes the step of imparting a resistance force to the movement.

According to this plate exchanging method, when the plate cylinder rotates in such a manner that the holding side end portion of the printing plate is locked to the outer peripheral surface of the plate cylinder and the printing plate is wound, resistance to movement of the printing plate is exerted. By further including a step of applying, the plate is attracted to the plate cylinder and tension is applied to the plate, so that the plate is attached to the outer peripheral surface of the plate cylinder without wrinkling or bending. Can be made.

In order to achieve the above-described object, in the printing machine of the present invention, ink is supplied to a supply unit that supplies a printing medium, and a printing plate wound around a plate cylinder, and the substrate that is supplied from the supply unit. In a printing machine comprising a printing unit that prints on a printing body, and a discharge unit that discharges the printing body printed by the printing unit, a holding unit that holds the plate, and the holding unit A mode in which a support member that is movably supported on the plate cylinder side and a holding side end portion of the printing plate held by the holding means are engaged with an outer peripheral surface of the plate cylinder to wind the printing plate When the plate cylinder is rotated, a plate changing apparatus provided with resistance applying means for applying resistance to the movement of the holding means pulled toward the plate cylinder side by the printing plate with respect to the printing unit. The printing plate is applied in an aspect in which the printing plate is wound around an outer peripheral surface of the plate cylinder.

According to this printing machine, since the holding means attracts the printing plate to the plate cylinder and applies tension to the printing plate, the printing plate is placed on the outer peripheral surface of the plate cylinder without causing wrinkles or bending of the printing plate. Can be accompanied. As a result, the printing plate can be properly wound around the plate cylinder, so that the failure of winding can be reduced, and the situation where the printing plate is remade and the winding operation is performed again on the plate cylinder can be reduced. In addition, it is not possible to apply tension to the printing plate because the printing plate is detached from the holding means, and it is possible to prevent a winding failure that causes wrinkles or creases in the printing plate and reduce the situation of remaking the printing plate.

According to the present invention, the printing plate can be properly wound around the plate cylinder.

FIG. 1 is a schematic view of a printing machine to which a plate changing apparatus according to an embodiment of the present invention is applied. FIG. 2 is a side view of the plate changer according to the embodiment of the present invention. FIG. 3 is a front view of the plate changer shown in FIG. FIG. 4 is a front view of a plate attachment mechanism in the plate exchange unit. FIG. 5 is a side view of the plate mounting mechanism. FIG. 6 is a block diagram showing a control system of the plate changer according to the embodiment of the present invention. FIG. 7 is a flowchart showing the operation of the plate changer according to the embodiment of the present invention. FIG. 8 is an operation diagram of the plate changer according to the embodiment of the present invention. FIG. 9 is an operation diagram of the plate changer according to the embodiment of the present invention. FIG. 10 is an operation diagram of the plate changer according to the embodiment of the present invention. FIG. 11 is an operation diagram of the plate changer according to the embodiment of the present invention. FIG. 12 is an operation diagram of the plate changer according to the embodiment of the present invention. FIG. 13 is an operation diagram of the plate changer according to the embodiment of the present invention. FIG. 14 is an operation diagram of the plate changer according to the embodiment of the present invention. FIG. 15 is a flowchart showing the operation of the plate changer according to the embodiment of the present invention.

Explanation of symbols

1 Offset rotary printing press (printing machine)
2A, 2B, 2C,

2D Printing unit

22a,

22b Plate cylinder

29a, 29b Gap part 11 Paper feeding device (supply part)
12 Infeed device 13 Printing device (printing unit)
14 Drying device 15 Cooling device 16 Web pass device 17 Folding device 18 Paper discharge device (discharge unit)
56a, 56b Plate pressing roller 70 Casing 71 Support member 71a Long hole 72 Air cylinder 81 Adsorption pad 81a Adsorption part 82 Rail 83 Moving member 84 Tension spring 85 Vacuum pump 86 Tube 87 Guide member 88 Pressure sensor 89 Protection member 91 Shaft member 92 Shaking Moving member 93 Contact roller 94 Air cylinder 95 Link 96 Receiving base 101 Shaft member 102 Oscillating lever 103 Contact arm 104 Air cylinder 110 Controller 111 Drive control unit 112 Storage unit 113 Judgment means P Printing plate Pf Buttock Pb buttock W end web end W web

Hereinafter, embodiments of the plate exchange device, the plate exchange method, and the printing machine according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

FIG. 1 is a schematic view of a printing machine to which a plate changing apparatus according to an embodiment of the present invention is applied, FIG. 2 is a side view of the plate changing apparatus according to the embodiment of the present invention, and FIG. 3 is shown in FIG. FIG.

The printing press of the present embodiment is an offset rotary printing press 1 that performs printing on a roll-shaped web (printed body) W using ink, as shown in FIG. The web offset press 1 includes a paper feeding device (supply unit) 11, an infeed device 12, a printing device (printing unit) 13, a drying device 14, a cooling device 15, a web pass device 16, a folding device. The apparatus 17 and a paper discharge device (discharge unit) 18 are configured.

The paper feeding device 11 has a reel stand on which two winding bodies (web rolls) are mounted, and the web W that has been drawn out of one winding body and travels is transferred to the other winding body. By connecting to the web, the web W can be continuously supplied. The infeed device 12 supplies the web W of the paper feeding device 11 to the printing device 13 side. The printing device 13 includes four

printing units

2A, 2B, 2C, and 2D for the four ink colors, ie, Cyan, Magenta, Yellow, and Black. Are arranged side by side. The drying device 14 is for drying the ink of the web W printed by the printing device 13. The cooling device 15 cools the web W that stores excess heat after drying in the drying device 14 to an appropriate temperature. The web pass device 16 conveys the dried and cooled web W. The folding device 17 cuts the vertically folded web W and folds it to a predetermined size to form a folded book. The paper discharge device 18 carries out the folded or folded book outside the apparatus.

Accordingly, the web W drawn from the winding body by the paper feeding device 11 is supplied to the printing device 13 by the infeed device 12, and in this printing device 13, the printing units 2 </ b> A, 2 </ b> B, 2 </ b> C, 2 </ b> D are multicolored. Printing is performed. The printed web W is dried with ink by the drying device 14, cooled with the cooling device 15, a folded book is created by the folding device 17 conveyed through the web pass device 16, and carried out by the paper discharge device 18. .

Here, in the offset rotary printing press of this embodiment, each

printing unit

2A, 2B, 2C, 2D is a double-sided printing machine that simultaneously prints on the front and back surfaces of the web W, and the color of the ink used (indigo) , Red, yellow, and black), the configuration is almost the same. Therefore, in the following description, only one printing unit 2A will be described.

In the printing unit 2A, as shown in FIG. 2, the front surface printing unit 20a is disposed above the conveyance path of the web W. On the other hand, a back surface printing unit 20b is disposed below the web W conveyance path. In the front surface printing unit 20a, a blanket cylinder 21a and a plate cylinder 22a are arranged above the conveyance path of the web W. The plate cylinder 22a is formed with a gap portion 29a in which a notch-side end portion and a buttocks-side end portion of the printing plate (not shown) are engaged. In addition, a part of the plate changing device is formed obliquely below the plate cylinder 22a, and when the printing plate is attached to the plate cylinder 22a, the outer surface of the plate cylinder 22a is driven by an air cylinder (not shown). A plate pressing roller 56a is provided that moves to a contact position in contact with the outer peripheral surface of the plate cylinder 22a. The plate pressing roller 56a is disposed at a standby position separated from the plate cylinder 22a except when the printing plate is attached. An ink supply device 23a is disposed above the plate cylinder 22a. In the ink supply device 23a, the ink fountain 24a is provided with an ink source roller 25a for kneading the ink metered by an ink key (not shown). The inking roller 25a is provided with a calling roller 26a so as to be able to come into contact therewith, and an ink roller group 27a is provided in contact with the calling roller 26a. In the ink roller group 27a, four ink form rollers 28a are provided in contact with the plate cylinder 22a.

On the other hand, a blanket cylinder 21b and a plate cylinder 22b are disposed below the conveyance path of the web W in the back surface printing unit 20b. The plate cylinder 22b is formed with a gap portion 29b in which a gripping side end portion and a gripping end side end portion of a printing plate (not shown) are locked. In addition, when the printing plate is attached to the plate cylinder 22b, the outer peripheral surface of the plate cylinder 22b is pressed in an aspect in which the printing plate is pressed against the outer peripheral surface of the plate cylinder 22b by driving an air cylinder (not shown). A plate pressing roller 56b that moves to a contact position in contact with the plate is provided. The plate pressing roller 56b is disposed at a standby position separated from the plate cylinder 22b except when the printing plate is attached. An ink supply device 23b is disposed above the plate cylinder 22b. In the ink supply device 23b, the ink fountain 24b is provided with an ink base roller 25b for kneading the ink metered by an ink key (not shown). The inking roller 25b is provided with a calling roller 26b so as to be able to come into contact therewith, and an ink roller group 27b is provided in contact with the calling roller 26b. Of the ink roller group 27b, four ink form rollers 28b are provided in contact with the plate cylinder 22b.

Accordingly, when each roller of each

ink supply device

23a, 23b is rotated, the ink whose supply amount is adjusted by the

ink source rollers

25a, 25b is supplied from the

ink fountains

24a, 24b to the calling

rollers

26a, 26b, and the ink roller group. After being appropriately kneaded by 27a and 27b and formed into a thin film, it is supplied from the

ink form rollers

28a and 28b to the outer peripheral surface of the printing plate mounted on the

plate cylinders

22a and 22b. The ink adhering to the printing plate is transferred to the

blanket cylinders

21a and 21b, and a predetermined printing pressure is applied to the web W by the

blanket cylinders

21a and 21b, so that the ink transferred to the

blanket cylinders

21a and 21b Is transferred to the front and back surfaces of the web W.

When one printing operation (for example, the required number of printings) is completed in the printing unit 2A of the present embodiment configured as described above, the printing plates (old plates) that have been mounted on the

plate cylinders

22a and 22b until then are removed. Then, a new printing plate (new printing plate) is mounted on the

plate cylinders

22a and 22b, and another printing operation is started. In this case, the plate changing operation is automatically performed using the plate changing apparatus of this embodiment.

As shown in FIGS. 2 and 3, each cylinder and each roller in the printing unit 2A (the front surface printing unit 20a and the back surface printing unit 20b) are arranged on the left and right sides of the printing unit 2A. An operation side frame 31 disposed on the operation side where the operator operates the plate exchange device on one side, and a drive side disposed on the drive side where the plate exchange device is driven on the other left and right sides of the printing unit 2A The frame 32 is rotatably supported. An upper guide rail 33 and a lower guide rail 34 are installed in a vertically extending position between the operation side frame 31 and the drive side frame 32 in a state of extending horizontally.

The upper guide rail 33 is integrally formed with a linear rail portion 33 a along the upper guide rail 33. Since the guide 41a provided on the upper support 41 is fitted to the rail portion 33a, the upper support 41 is supported movably along the extending direction of the upper guide rail 33. The upper support body 41 extends horizontally along the upper guide rail 33, and a pair of left and right support frames 42 are suspended from each end in the longitudinal direction. An upper plate exchange unit 50a is disposed between the support frames 42.

Further, the upper guide rail 33 is provided with a rack (not shown) along the extending direction. On the other hand, an upper drive stop device 43 is mounted on the upper support 41. The drive gear rotated by the upper drive stop device 43 meshes with the rack. Therefore, when the upper drive stop device 43 is driven, the drive gear rotates while meshing with the rack, and the upper plate replacement unit 50 a moves along with the upper support rail 41 along the extending direction of the upper guide rail 33. The upper drive stopping device 43 includes a drive motor and a brake mechanism (not shown). The upper drive replacement unit 50a is moved together with the upper support 41 to the operation side or the drive side by the drive motor, and the upper support is supported by the brake mechanism. The movement of the upper plate exchange unit 50a accompanying 41 is stopped.

On the other hand, a linear rail portion 34 a is integrally formed on the lower guide rail 34 along the lower guide rail 34. Since the guide 61a provided on the lower support 61 is fitted to the rail portion 34a, the lower support 61 is supported movably along the extending direction of the lower guide rail 34. The lower support 61 extends horizontally along the lower guide rail 34, and a pair of left and right support frames 62 are provided upright at each end in the longitudinal direction. A lower plate exchange unit 50b is disposed between the support frames 62.

The lower guide rail 34 is provided with a rack (not shown) along the extending direction. On the other hand, a lower drive stopping device 63 is mounted on the lower support 61. The drive gear rotated by the lower drive stop device 63 meshes with the rack. Therefore, when the lower drive stopping device 63 is driven, the drive gear rotates while meshing with the rack, and the lower plate replacement unit 50 b moves along with the extension direction of the lower guide rail 34 together with the lower support 61. The lower drive stopping device 63 includes a drive motor and a brake mechanism (not shown). The lower plate replacement unit 50b is moved together with the lower support 61 to the operation side or the drive side by the drive motor, and the lower support is supported by the brake mechanism. The movement of the lower plate exchange unit 50b accompanying 61 is stopped.

Further, in the plate exchanging apparatus of this embodiment, the upper plate exchanging unit 50a is rotatably supported with respect to each support frame 42 by a support shaft 51a whose left and right side portions extend in the left-right direction. Each support frame 42 is connected to the base end of a pair of left and right air cylinders 52a. The tip of the cylinder rod of the air cylinder 52a is connected to the left and right sides of the upper plate replacement unit 50a. Therefore, when each air cylinder 52a is expanded and contracted, the upper plate replacement unit 50a turns around the axis of the support shaft 51a. The upper plate replacement unit 50a is a plate replacement position that faces the plate cylinder 22a in order to replace the printing plate. The upper plate replacement unit 50a is a vertical position (substantially vertically disposed so that the lower end portion is separated from the plate cylinder 22a by the air cylinder 52a. 2) and an inclined position (indicated by a two-dot chain line in FIG. 2) inclined so that the lower end approaches the plate cylinder 22 a. A position where the upper plate exchange unit 50a is disposed substantially vertically at the plate exchange position is set as a standby position. When the upper plate replacement unit 50a is disposed at the inclined position, the upper plate replacement unit 50a is positioned at the inclined position by the positioning mechanism. As shown in FIG. 2, the positioning mechanism is composed of a positioning hole 53a provided on each frame 31, 32 side and a positioning pin 54a provided on the upper plate replacement unit 50a side, and the upper plate replacement unit 50a. By positioning the positioning pin 54a into the positioning hole 53a at the inclined position, the upper plate replacement unit 50a is positioned with respect to the plate cylinder 22a. The tilt position of the upper plate replacement unit 50a is detected by a stroke sensor 55a provided in the air cylinder 52a. The control device 110, which will be described later, performs a plate replacement operation for the plate cylinder 22a based on the detection result of the stroke sensor 55a.

On the other hand, the lower plate replacement unit 50b is rotatably supported with respect to each support frame 62 by a support shaft 51b whose left and right side portions extend in the left-right direction. Each support frame 62 is connected to the base end of a pair of left and right air cylinders 52b. The tip of the cylinder rod of the air cylinder 52b is connected to the left and right sides of the lower plate replacement unit 50b. Therefore, each air cylinder 52b is expanded and contracted, so that the lower plate replacement unit 50b turns around the axis of the support shaft 51b. The lower plate replacement unit 50b is a plate replacement position that faces the plate cylinder 22b in order to replace the printing plate. The lower plate replacement unit 50b is a vertical position that is arranged substantially vertically so that the upper end portion is separated from the plate cylinder 22b by the air cylinder 52b. 2) and an inclined position (indicated by a two-dot chain line in FIG. 2) inclined so that the upper end approaches the plate cylinder 22 b. The position where the lower plate replacement unit 50b is arranged substantially vertically at the plate replacement position is set as a standby position. When the lower plate replacement unit 50b is disposed at the inclined position, the lower plate replacement unit 50b is positioned at the inclined position by the positioning mechanism. As shown in FIG. 2, the positioning mechanism includes a positioning hole 53b provided on each frame 31, 32 side, and a positioning pin 54b provided on the lower plate replacement unit 50b side, and the lower plate replacement unit 50b. By positioning the positioning pin 54b into the positioning hole 53b at the inclined position, the lower plate replacement unit 50b is positioned with respect to the plate cylinder 22b. The inclined position of the lower plate replacement unit 50b is detected by a stroke sensor 55b provided in the air cylinder 52b. The control device 110, which will be described later, performs a plate replacement operation for the plate cylinder 22b based on the detection result of the stroke sensor 55b.

Each of the

plate replacement units

50a and 50b incorporates a plate attachment mechanism for attaching a printing plate (new plate) to the

plate cylinders

22a and 22b. FIG. 4 is a front view of a plate attachment mechanism in the plate exchange unit, and FIG. 5 is a side view of the plate attachment mechanism. In each of the

plate replacement units

50a and 50b, the plate mounting mechanism is the same and configured vertically symmetrically. Therefore, in this embodiment, the plate mounting mechanism of the upper plate replacement unit 50a will be described, and the description of the plate mounting mechanism of the lower plate replacement unit 50b will be omitted.

The plate attachment mechanism is built in the casing 70 of the upper plate replacement unit 50a. A support member 71 is provided at the center of the casing 70. The support member 71 is a rectangular plate that extends in the vertical and horizontal directions when the upper plate replacement unit 50 a is in a substantially vertical standby position, and the left and right ends thereof are vertical relative to the left and right sides of the casing 70. It is slidably mounted in the direction. Further, the base end portion of the air cylinder 72 is connected to the upper portion of the casing 70. The tip of the cylinder rod of the air cylinder 72 is connected to the support member 71. Therefore, when the air cylinder 72 is expanded and contracted, the support member 71 slides in the vertical direction (a direction in which the upper plate replacement unit 50a approaches or separates from the plate cylinder 22a when the upper plate replacement unit 50a is disposed at the inclined position). The position of the support member 71 moved away from the plate cylinder 22a is set as a standby position.

The support member 71 is provided with a suction pad 81 as a holding means for holding the printing plate. The suction pad 81 is disposed on the front surface side of the support member 71, and the base portion thereof is disposed on the back surface side of the support member 71 through the long hole 71 a of the support member 71. The long hole 71a is provided extending in the vertical direction. Further, a pair of rails 82 are provided on the back side of the support member 71 along the long holes 71a, and the base portion of the suction pad 81 is attached to the moving member 83 that moves while being guided by the rails 82. ing. That is, the suction pad 81 is supported so as to be movable in the vertical direction with respect to the support member 71 (the direction in which the upper plate replacement unit 50a is moved toward or away from the plate cylinder 22a when the upper plate replacement unit 50a is disposed at the inclined position). Movement in the direction is regulated by the rail 82. Further, a tension spring (resistance imparting means) 84 is interposed between the suction pad 81 and the support member 71. The tension spring 84 is a tension coil spring, one end of which is fixed to the moving member 83 and the other end is fixed to the support member 71, and always applies a biasing force that pulls the suction pad 81 upward. A plurality of suction pads 81 provided in this way are arranged in parallel in the left-right direction of the support member 71 (four in this embodiment), and the tube 86 is attached to one vacuum pump 85 attached above the casing 70. Are connected in parallel. Therefore, the plate can be sucked and held by each suction pad 81 by the operation of the vacuum pump 85. Further, the vacuum pump 85 is provided with a pressure sensor 88 for detecting the pressure. The tube 86 is guided through a caterpillar type guide member 87 disposed between the casing 70 and the support member 71 so that the tube 86 is not broken or crushed when the support member 71 is slid.

It should be noted that a plurality of vacuum pumps 85 may be provided in order to prevent a situation where the printing plate cannot be held due to a failure of the vacuum pump 85 or a situation where the printing plate is detached from the suction pad 81. In this case, several suction pads 81 can be connected in parallel to one vacuum pump 85 to form a plurality of vacuum circuits. In this configuration, it is preferable to arrange the suction pads 81 connected to different vacuum pumps 85 next to each other. In addition, a vacuum circuit in which a vacuum pump 85 is provided for each suction pad 81 can be configured.

Further, a protective member 89 is provided on the front side of the support member 71. The protection member 89 extends in the vertical direction and is formed so as to protrude from the front surface of the support member 71. This protective member 89 is provided side by side on the side of the suction pad 81 and is formed so that the central portion in the longitudinal direction protrudes at substantially the same height as the suction portion 81a that contacts the printing plate of the suction pad 81, and both end sides in the longitudinal direction. The upper end side and the lower end side are formed so as to be gradually inclined toward the front surface of the support member 71. The protective member 89 is configured so that the flange portions Pf and Pb (see FIG. 8) formed at the holding side end and the holding bottom side end of the printing plate are caught by the suction pad 81 when the printing plate is attached to the plate cylinder 22a. It works like no.

A shaft member 91 extending in the left-right direction so as to straddle the front side of the support member 71 is rotatably supported in the middle of the left and right side portions of the casing 70. A rocking member 92 is fixed to the shaft member 91. The swing member 92 is provided so as to extend in the left-right direction along the shaft member 91. The swing member 92 is provided with a plurality of contact rollers (other resistance applying means) 93 (two on the left and right in this embodiment) at the upper end thereof. Then, when the shaft member 91 rotates about its own axis, the swing member 92 swings and the contact roller 93 moves in a direction approaching or separating from the front side of the support member 71. The position of the contact roller 93 separated from the front side of the support member 71 is set as a standby position. Further, the base end portion of the air cylinder 94 is connected to the outer portion of the casing 70. The tip of the cylinder rod of the air cylinder 94 is connected to the shaft member 91 via a link 95. Therefore, when the air cylinder 94 is expanded and contracted, the swing member 92 swings about the shaft center of the shaft member 91. Further, on the front side of the support member 71, a cradle (another resistance applying unit) 96 is provided so as to face the contact roller 93 and extend in the vertical direction. When the swinging member 92 swings and the contact roller 93 approaches the front side of the support member 71, the printing plate can be sandwiched between the receiving table 96. The contact roller 93 may be configured to sandwich the printing plate with the support member 71 not provided with the receiving table 96.

A shaft member 101 extending in the left-right direction is rotatably supported at the lower ends of the left and right side portions of the casing 70. A swing lever 102 is fixed to both ends of the shaft member 101. The swing lever 102 is provided extending in the vertical direction. A contact arm 103 is installed at the lower end of each swing lever 102 in parallel with the shaft member 101. When the shaft member 101 rotates about its own axis, the swing lever 102 swings and the contact arm 103 moves in the direction of arrows S1-S2 in FIG. 5 (the upper plate replacement unit 50a is disposed at the tilt position. In this case, it moves in the direction [S2] approaching or separating [S1] from the plate cylinder 22a). The position of the contact arm 103 moved in the S1 direction is set as a standby position. Further, a base end portion of the air cylinder 104 is connected to the outer portion of the casing 70. The tip of the cylinder rod of the air cylinder 104 is connected to the upper end of the swing lever 102. Therefore, when the air cylinder 104 is expanded and contracted, the swing lever 102 swings about the shaft center of the shaft member 101.

Although not explicitly shown in the figure, each of the

plate replacement units

50a and 50b described above incorporates a plate removal mechanism for removing the printing plate (old plate) from the

plate cylinders

22a and 22b.

FIG. 6 is a block diagram showing a control system of the plate changer according to the embodiment of the present invention. As shown in FIG. 6, the plate changer includes a control device (control means) 110 configured by a microcomputer or the like. The control device 110 is provided with a drive control unit 111. A storage unit 112 and a determination unit 113 are connected to the drive control unit 111. The drive control unit 111 includes an air pump for an air cylinder 94 that moves the contact roller 93, a vacuum pump 85 that functions the suction pad 81, and an air cylinder that moves the support member 71. 72, an air pump for the air cylinder 104 for moving the contact arm 103, an air pump for the air cylinder for moving the plate pressing roller 56a, and a drive motor for rotating the plate cylinder 22a are connected. Further, a pressure sensor 88 that detects the pressure of the vacuum pump 85 is connected to the drive control unit 111. The drive control unit 111 controls the upper plate change unit 50 a and the plate cylinder 22 a according to programs and data stored in advance in the storage unit 112, and further controls the plate cylinder 22 a according to the determination information acquired from the determination unit 113.

The storage unit 112 stores a threshold value for determining whether or not the printing plate is sucked onto the suction pad 81. For example, when the pressure applied to the vacuum pump 85 (or the vacuum circuit) is less than 30 Pa, the printing plate is not normally adsorbed to the suction pad 81, and when the pressure is 30 Pa or more, printing is performed on the suction pad 81. The plate is adsorbed normally. Therefore, the storage unit 112 stores a reference pressure “30 Pa” as a threshold value.

The determination unit 113 compares the pressure applied to the vacuum pump 85 acquired from the pressure sensor 88 with the reference pressure acquired from the storage unit 112, and if the detected pressure is equal to or higher than the reference pressure, the printing plate is applied to the suction pad 81. Is determined to be adsorbed normally. On the other hand, when the detected pressure is lower than the reference pressure, it is determined that the printing plate is detached from the suction pad 81.

Control of the upper plate replacement unit 50a and the plate cylinder 22a by the drive control unit 111 of the control device 110 will be described with reference to the flowchart of FIG. 7 and the operation diagrams of FIGS.

In the automatic plate changing operation by the plate changing apparatus of the present embodiment, the plate changing operation in the plate cylinder 22a of the surface printing unit 20a, that is, the plate changing operation by the upper plate changing unit 50a will be described. Further, in this plate replacement operation, the printing plate (old plate) is previously removed from the plate cylinder 22a by a plate removal mechanism (not shown) of the upper plate replacement unit 50a. Therefore, an operation of attaching the printing plate (new plate) to the plate cylinder 22a by the plate attachment mechanism of the upper plate replacement unit 50a will be described.

First, a newly made plate (new plate) P is set in the upper plate replacement unit 50a. In order to set the printing plate P, as shown in FIG. 8, the suction pad 81 is pulled upward by the tension spring 84, the support member 71 moves upward, and the standby arm 103 moves in the S1 direction. It is considered as a position. From this state, the air cylinder 94 is driven to move the contact roller 93 close to the front side of the support member 71 (step S1). As a result, the printing plate P disposed on the front side of the support member 71 is sandwiched between the contact roller 93 and the cradle 96. Next, the suction pump 81 is caused to function by driving the vacuum pump 85 (step S2). As a result, the printing plate P is sucked to the suction pad 81. In this way, the printing plate P is set in the upper plate replacement unit 50a. In addition, a collar portion Pf that is bent toward the front side of the support member 71 is formed at the end of the printing plate P set in the upper plate replacement unit 50a, and the front end of the support member 71 is also formed at the end of the end of the gripper. A flange portion Pb bent to the side is formed. This plate P setting operation is performed, for example, by moving the upper plate replacement unit 50a to the operation side.

Next, the printing plate P set in the upper plate replacement unit 50a is attached to the plate cylinder 22a. In this case, the upper drive stopping device 43 is driven to move the upper plate exchange unit 50a to the plate exchange position (step S3). This plate exchange position is detected by the output of a detection means (not shown) that detects the position of the upper plate exchange unit 50a. Next, the air cylinder 52a is driven to move the upper plate replacement unit 50a to the inclined position shown in FIG. 9 (step S4). This tilt position is detected by the output of the stroke sensor 55a.

Next, as shown in FIG. 10, the air cylinder 72 is driven to move the support member 71 in a direction approaching the plate cylinder 22a (step S5). As a result, the printing plate P moves together with the support member 71 so that the printing plate P passes the plate cylinder 22a side with respect to the abutting arm 103, and the collar portion Pf at the end on the side to be replaced is the gap portion 29a of the plate cylinder 22a. It is arrange | positioned facing the opening part.

Next, as shown in FIG. 11, the air cylinder 104 is driven to move the contact arm 103 in the direction of arrow S2 approaching the plate cylinder 22a (step S6). As a result, the contact arm 103 contacts the printing plate P, and the printing plate P is warped toward the plate cylinder 22a, so that the flange portion Pf is inserted into the gap portion 29a.

Next, as shown in FIG. 12, the plate cylinder 22a is rotated (step S7). Here, the printing plate P is adsorbed by the adsorbing pad 81 and sandwiched between the receiving table 96 by the abutting roller 93. Thus, since the printing plate P is held, the plate portion 22f of the printing plate P inserted into the gap portion 29a is fitted to the edge of the gap portion 29a by rotating the plate cylinder 22a. Further, when the plate cylinder 22a rotates, the printing plate P in which the flange portion Pf is fitted in the gap portion 29a is wound around the outer surface of the plate cylinder 22a while being pulled and moved toward the plate cylinder 22a.

At this time, along with the movement of the printing plate P, the suction pad 81 sucked on the printing plate P is also pulled toward the plate cylinder 22a side. However, the moving member 83 can move along the rail 82 in the suction pad 81. Therefore, it moves together with the printing plate P toward the plate cylinder 22a (the circumferential direction of the plate cylinder 22a). For this reason, the suction pad 81 does not remove the suction of the printing plate P. Further, the moving member 83 is connected by a support member 71 and a tension spring 84. For this reason, since the suction pad 81 sucks the printing plate P and is given resistance to its movement, the gap Pf of the printing plate P is securely fitted to the edge of the gap portion 29a without gaps. By attracting the printing plate P with the portion 29a and applying tension to the printing plate P, the printing plate P can be attached to the outer peripheral surface of the printing drum 22a without causing wrinkles or bending. In addition, since the contact roller 93 sandwiches the printing plate P between the receiving plate 96 and this, tension is applied to the printing plate P. Moreover, since the contact roller 93 presses the printing plate P toward the cradle 96 (support member 71), the suction plate 81 can be pressed against the suction pad 81 to assist the suction of the suction pad 81. .

Next, along with the rotation of the plate cylinder 22a, the plate pressing roller 56a is moved to a contact position in contact with the plate cylinder 22a (step S8). As a result, as shown in FIG. 13, the gap 29a passes through the position of the plate pressing roller 56a as the plate cylinder 22a rotates, so that the printing plate P is pressed by the plate pressing roller 56a and the outer periphery of the plate cylinder 22a. It will follow the surface. When the printing plate P is pressed by the plate pressing roller 56a, it is not necessary to apply tension to the printing plate P by the suction pad 81 and the contact roller 93. Therefore, the rotation angle of the plate cylinder 22a is detected by a plate cylinder sensor (not shown), and from the start of rotation of the plate cylinder 22a in step S9 until the printing plate P is pressed by the plate pressing roller 56a by the plate cylinder sensor. When 22a rotates (step S9: Yes), the drive of the vacuum pump 85 is stopped to stop the suction of the suction pad 81, and the air cylinder 94 is driven to place the contact roller 93 at the standby position for clamping. Stop (step S10). The suction pad 81 may be provided so as to be movable until no tension is applied to the printing plate P, that is, until the printing plate P is pressed by the plate pressing roller 56a.

Then, as shown in FIG. 14, the plate cylinder 22a is further rotated, and the gap 29a passes again through the position of the plate pressing roller 56a, whereby the printing plate P is pressed by the plate pressing roller 56a and the printing plate P is formed. The collar portion Pb at the end on the side of the mouth fits into the gap portion 29a, and the printing plate P is mounted along the outer peripheral surface of the plate cylinder 22a. Accordingly, the rotation angle of the plate cylinder 22a is detected by a plate cylinder sensor (not shown), and the plate cylinder 22a is rotated by the plate cylinder sensor until the printing plate P is again pressed by the plate pressing roller 56a (step S11: Yes). ), The rotation of the plate cylinder 22a is stopped, and all of the plate pressing roller 56a, the contact arm 103, the support member 71 and the like are moved to the standby position, and the upper plate change unit 50a is moved to the operation side (step S12). ), This control is terminated.

Further, in the automatic plate changing operation by the plate changing apparatus described above, the suction of the suction pad 81 and the tension spring 84 from the time when the plate cylinder 22a is rotated in step S7 until the suction of the suction pad 81 is stopped in step S10. Tension is applied to the printing plate P by the resistance force. During this time, if the suction pad 81 is unsucked, the printing plate P is not sufficiently tensioned, and the printing plate P may be wrinkled or broken. Therefore, as shown in the flowchart of FIG. 15, the upper plate replacement unit 50 a and the plate cylinder 22 a are controlled by the drive control unit 111 of the control device 110.

That is, during the above-described step S7 to step S10, the pressure sensor 88 detects the pressure of the vacuum pump 85 (step S21), and compares this detected pressure with the reference pressure stored in the storage unit 112, When the detected pressure is equal to or higher than the reference pressure (step S22: No), it is determined that the printing plate P is normally sucked by the suction pad 81, and the process returns to step S21. Further, when the detected pressure is compared with the reference pressure stored in the storage unit 112 and the detected pressure is less than the reference pressure (step S22: Yes), the printing plate P is normally adsorbed to the adsorption pad 81. It is determined that there is not, the rotation of the plate cylinder 22a is stopped, and the automatic plate change operation is terminated (step S23).

As described above, in the plate changing apparatus of this embodiment, the suction pad 81 that holds the printing plate P is supported by the support member 71 so as to be movable toward the plate cylinder 22a (22b), and is held by the suction pad 81. The plate cylinder 22a (22b) is wound around the plate portion 22a (22b) so that the plate portion 22f is wound around the gap portion 29a (29b) of the plate cylinder 22a (22b). A tension spring 84 is provided between the suction pad 81 and the support member 71 that provides resistance to the movement of the suction pad 81 pulled by the printing plate P toward the plate cylinder 22a (22b) when rotated. For this reason, since the suction pad 81 attracts the printing plate P to the gap portion 29a and applies tension to the printing plate P, the flange portion Pf at the holding side end portion of the printing plate P is engaged with the gap portion 29a without a gap. The plate cylinder 22a (22b) can be attached to the outer periphery of the plate cylinder P without being wrinkled or bent. Moreover, the suction pad 81 adsorbed on the printing plate P is pulled toward the plate cylinder 22a (22b), but the suction pad 81 is provided so as to be movable toward the plate cylinder 22a (22b). It moves to the plate cylinder 22a side together with P. For this reason, the suction pad 81 is prevented from coming off from the suction of the printing plate P. As a result, since the printing plate P can be properly wound around the plate cylinder 22a (22b), the failure of winding is reduced, and the printing plate P is made again and wound around the plate cylinder 22a (22b) again. The situation where work is performed can be reduced. In order to further suppress the situation where the printing plate P is detached from the suction pad 81 drawn toward the plate cylinder 22a (22b), and to apply tension to the printing plate P, the suction holding force for holding the printing plate P is used. The elasticity (resistance force) of the tension spring 84 is reduced.

Further, when the plate cylinder 22a (22b) is rotated in a mode in which the printing plate P is wound, the pressure of the vacuum pump 85 is detected by the pressure sensor 88, and the detected pressure is compared with the reference pressure to thereby obtain the suction pad 81. And a controller for stopping the rotation of the plate cylinder 22a (22b) based on the detection result of the separation detecting means. The plate P can be detached from the suction pad 81 and the above-mentioned tension cannot be applied, and failure of winding in which the plate P is wrinkled or broken can be prevented before the plate P is remade.

The printing plate P is further provided with a contact roller 93 that sandwiches the printing plate P with the support member 71 and applies resistance to the movement of the printing plate P wound around the plate cylinder 22a (22b). P can be attached to the outer peripheral surface of the plate cylinder 22a (22b) without wrinkles or creases. In addition, since the contact roller 93 presses the printing plate P toward the support member 71, it can press the printing plate P against the suction pad 81 and assist the suction of the suction pad 81.

In the plate exchanging method of this embodiment, the collar portion Pf at the end of the holding side of the printing plate P is engaged with the gap portion 29a (29b) of the plate cylinder 22a (22b) to wind the printing plate P. In this manner, when the plate cylinder 22a (22b) rotates and the suction pad 81 is pulled by the printing plate P and moves toward the plate cylinder 22a (22b), a process of applying resistance to the movement of the suction pad 81 is performed. Contains. For this reason, the suction pad 81 attracts the printing plate P between the gap portion 29a and applies tension to the printing plate P. Therefore, the outer peripheral surface of the plate cylinder 22a (22b) does not cause wrinkles or folds. Can be accompanied. As a result, since the printing plate P can be properly wound around the plate cylinder 22a (22b), the failure of winding is reduced, and the printing plate P is made again and wound around the plate cylinder 22a (22b) again. The situation where work is performed can be reduced.

Further, when the printing plate P is detached from the suction pad 81, the printing plate P is detached from the suction pad 81 and cannot be applied with the above tension by further including a step of stopping the rotation of the plate cylinder 22a (22b). Further, it is possible to prevent a winding failure that causes wrinkles or creases in the printing plate P, and to reduce the situation of making the printing plate P again.

In addition, the plate cylinder 22a (22b) is wound around the plate portion 22a (22b) so that the plate portion 22f is wound around the gap portion 29a (29b) of the plate cylinder 22a (22b). By further including a step of imparting resistance to the movement of the printing plate P when rotated, the printing plate P can be attached to the outer peripheral surface of the plate cylinder 22a (22b) without causing wrinkles or folds.

In the printing machine according to the present embodiment, since the plate changing device is applied to the printing device, the printing plate P can be properly wound around the plate cylinder 22a (22b). This can reduce the situation in which the printing plate P is remade and the winding work around the plate cylinder 22a (22b) is performed again. In addition, when it is detected that the suction of the suction pad 81 is released and the printing plate P is detached, the plate P is detached from the suction pad 81 by stopping the rotation of the plate cylinder 22a (22b), and the above tension is applied. , The failure of winding that causes wrinkles or creases in the printing plate P can be prevented in advance, and the situation in which the printing plate P is remade can be reduced. In addition, the printing plate P is sandwiched between the support member 71 side and a contact roller 93 that gives resistance to the movement of the printing plate P wound around the plate cylinder 22a (22b) is further provided. The plate P can be attached to the outer peripheral surface of the plate cylinder 22a (22b) without causing wrinkles or folds, and the suction of the suction pad 81 can be assisted by pressing the plate P against the suction pad 81.

In the above-described embodiment, the holding means for holding the printing plate P is not limited to the suction pad 81, and the holding plate P may be held by a nip of a roller. In addition to the tension spring 84, a configuration that causes resistance to rotation of the roller may be applied. The resistance applying means is not limited to the tension spring 84 described above, and has elasticity such as a spring having a configuration other than the coil spring (for example, a leaf spring), a cylinder or a damper using hydraulic or air resistance, or rubber. An elastic member may be applied.

In the above-described embodiments, the rotary offset printing machine has been described as the printing machine. For example, although not clearly shown in the drawing, the above-described plate changing apparatus is used for a sheet-fed printing machine that performs printing on each printing sheet. And a plate exchange method may be applied.

As described above, the plate changing apparatus, the plate changing method, and the printing machine according to the present invention are useful for automatically changing the printing plate wound around the plate cylinder of the offset printing machine, and in particular, the plate cylinder. It is suitable for properly winding the printing plate.

Claims

In a plate changer that winds a printing plate around the outer periphery of a plate cylinder,
Holding means for holding the printing plate;
A support member that movably supports the holding means toward the plate cylinder side;
When the plate cylinder is rotated in such a manner that the holding side end portion of the printing plate held by the holding means is locked to the outer peripheral surface of the plate cylinder and the printing plate is wound around, A plate changing apparatus comprising: a resistance applying unit that applies a resistance force to the movement of the holding unit pulled toward the plate cylinder.
2. The plate changing apparatus according to claim 1, wherein a resistance force of the resistance applying unit is made smaller than a holding force for holding the printing plate by the holding unit.
When the plate cylinder rotates in such a manner that the holding side end portion of the printing plate held by the holding means is locked to the outer peripheral surface of the plate cylinder and the printing plate is wound around, A detachment detecting means for detecting detachment of the printing plate;
The plate changer according to claim 1, further comprising: a control unit that stops the rotation of the plate cylinder based on a detection result by the separation detection unit.
The aspect of applying a resistance force to the movement of the printing plate wound around the plate cylinder, further comprising another resistance applying means for sandwiching the printing plate with the support member. The plate changer according to 1.
In the plate exchange method in which the printing plate is wound around the outer peripheral surface of the plate cylinder,
The plate cylinder rotates in such a manner that the end portion on the holding side of the printing plate is locked to the outer peripheral surface of the plate cylinder and winds the printing plate, and the holding means for holding the printing plate is pulled by the printing plate. A plate exchanging method comprising a step of applying a resistance force to the movement of the holding means when moved to the plate cylinder side.
6. The plate replacement method according to claim 5, further comprising a step of stopping rotation of the plate cylinder when the printing plate is detached from the holding means.
A step of imparting resistance to the movement of the printing plate when the printing plate is rotated in such a manner that the holding side end of the printing plate is locked to the outer peripheral surface of the printing drum and the printing plate is wound thereon; The plate replacement method according to claim 5, further comprising:
Printing is performed by the supply unit for supplying the printing medium, the printing unit for supplying ink to the printing plate wound around the plate cylinder and printing the printing medium supplied from the supply unit, and the printing unit. In a printing machine comprising a discharge unit that discharges the printed material that has been applied,
Holding means for holding the printing plate;
A support member that movably supports the holding means toward the plate cylinder side;
When the plate cylinder is rotated in such a manner that the holding side end portion of the printing plate held by the holding means is locked to the outer peripheral surface of the plate cylinder and the printing plate is wound around, Resistance imparting means for imparting resistance to movement of the holding means pulled toward the plate cylinder side;
A printing machine, wherein the printing plate is applied to the printing unit in such a manner that the printing plate is wound around the outer peripheral surface of the printing drum.